Merge pull request #28 from dexoron/dev

v0.8.1
feat(build): add flat-bin kind and FAT [archive] packing for OS-dev
2026-10-21 17:29:36 +00:00 · 2026-07-21 18:12:56 +08:00 · 2026-07-21 17:45:02 +08:00 · 2026-07-18 20:21:41 +08:00 · 2026-07-18 20:05:12 +08:00 · 2026-07-18 20:02:12 +08:00
60 changed files with 4692 additions and 2373 deletions
--- a/.github/workflows/trigger-site-build.yml
+++ b/.github/workflows/trigger-site-build.yml
@@ -0,0 +1,14 @@
+name: Trigger site rebuild
+
+on:
+  push:
+    branches: [master]
+    paths:
+      - 'docs/**'
+
+jobs:
+  trigger:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger Cloudflare Pages build
+        run: curl -sS -X POST "${{ secrets.CF_PAGES_DEPLOY_HOOK }}"
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,5 @@ sandbox/**
 .env

 personal/
+.*
+!.gitignore
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,99 @@
 # Changelog

+## [0.8.1] - 2026-07-20 "OS-Dev: flat-bin, FAT-образы / OS-Dev: flat-bin & FAT Images"
+
+### RU
+
+**Добавлено:**
+
+- **`build.kind = "flat-bin"`** — сырой бинарный артефакт (расширение по умолчанию `.bin`):
+  - **NASM** — `-f bin`, прямой вывод `<stem>.bin`
+  - **FASM** — прямой вывод (ожидается `format binary` в исходнике)
+  - **GAS / MASM / LLVM IR (`llc`)** — объект → `objcopy -O binary` → `<stem>.bin`
+  - **C/C++ (gcc/clang/MSVC)** — compile → link (nostdlib/static) → `objcopy -O binary` → `<name>.bin`
+  - Требуется `llvm-objcopy` / `objcopy` / `gobjcopy` в PATH (кроме NASM/FASM direct)
+- **Секция `[archive]`** — после успешной сборки DCR собирает образ диска (FAT12/16/32 через `fatfs`): размер, offset, volume label, опциональный bootsector (512 байт в начало при `offset = 0`) и `layout` (копирование файлов/glob в FS). Плейсхолдер `{profile}` в путях.
+- **Одиночные файлы в `build.roots`** — корень может быть файлом (`.c`, `.asm`, header), а не только каталогом; то же для сбора заголовков в cache.
+
+**Изменено:**
+
+- **`dcr build --force` / `dcr run --force`** — force также перезапускает `build.steps` и `build.post_steps`.
+- **`dcr run` на workspace-only root** — если задан `[run].cmd`, сначала build + run по конфигу корня; иначе делегирование члену workspace (как в 0.8.0).
+
+**Зависимости:**
+
+- `fatfs = "0.3"` для упаковки FAT-образов.
+
+### EN
+
+**Added:**
+
+- **`build.kind = "flat-bin"`** — raw binary artifact (default extension `.bin`):
+  - **NASM** — `-f bin`, direct `<stem>.bin`
+  - **FASM** — direct output (`format binary` in source)
+  - **GAS / MASM / LLVM IR (`llc`)** — object → `objcopy -O binary` → `<stem>.bin`
+  - **C/C++ (gcc/clang/MSVC)** — compile → link (`-nostdlib -static`) → `objcopy -O binary` → `<name>.bin`
+  - Needs `llvm-objcopy` / `objcopy` / `gobjcopy` in PATH (except NASM/FASM direct)
+- **`[archive]` section** — after a successful build, pack a disk image (FAT12/16/32 via `fatfs`): size, offset, volume label, optional bootsector (512 bytes at start when `offset = 0`), and `layout` (file/glob copy into the FS). `{profile}` substitution in paths.
+- **Single-file `build.roots`** — a root may be a file (`.c`, `.asm`, header), not only a directory; header collection in the cache follows the same rule.
+
+**Changed:**
+
+- **`dcr build --force` / `dcr run --force`** — force also re-runs `build.steps` and `build.post_steps`.
+- **`dcr run` on a workspace-only root** — if `[run].cmd` is set, build + run that command first; otherwise fall back to workspace member delegation (0.8.0 behavior).
+
+**Dependencies:**
+
+- `fatfs = "0.3"` for FAT image packing.
+
+## [0.8.0] - 2026-07-18 "Модульный Движок Сборки, Новая Архитектура Ядра и Улучшение Workspaces / Modular Build Engine, New Core Architecture, & Workspace Improvements"
+
+### RU
+
+**Добавлено:**
+
+- **Выделенное ядро сборки (Build Engine extraction)** — вся логика оркестрации компиляции и сборки полностью вынесена из интерфейсного модуля `src/cli/build.rs` в изолированный, переиспользуемый модуль ядра `src/core/build/engine.rs`.
+- **Полиморфная модель языков (Трейт `Language`)** — введение абстрактного трейта `Language` (`src/core/build/language/mod.rs`). Логика поиска файлов, сопоставления расширений и компиляторов распределена по выделенным языковым бэкендам для C, C++ (включая шаги генерации Qt), LLVM IR и ассемблера (GAS, NASM, FASM, MASM).
+- **Абстракция сборщиков (Трейт `Builder`)** — введение трейта `Builder` для полиморфного управления процессами компиляции (`src/core/build/builder/mod.rs`). Логика вызова компиляторов семейства GCC/Clang вынесена в общий модуль `builder/cc_common.rs`, а MSVC — в `builder/msvc/`.
+- **Поязыковая конфигурация (`[build.<lang>]`)** — добавлена поддержка индивидуальных настроек для каждого языка в `dcr.toml` (например, `[build.c]`, `[build.cpp]`, `[build.asm]`), позволяя независимо настраивать компилятор, стандарт и флаги сборки.
+- **Интеграция путей зависимостей в Workspaces** — сборщик теперь автоматически инжектирует пути заголовков (включая исходники `src/` членов, папки `include/` и директорию `target/include`) и библиотек (`target/lib`, а также специфичные для целевой платформы папки сборки) зависимых членов workspace при сборке.
+- **Система событий `BuildReporter`** — весь вывод сборщика переведён на событийную модель (`src/core/build/report.rs`), что делает движок пригодным для программного встраивания (например, в IDE) без необходимости перехвата stdout/stderr.
+- **Поддержка отмены сборки** — добавлен потокобезопасный токен отмены (`Arc<AtomicBool>`), позволяющий безопасно прервать выполнение компиляции на любом этапе.
+- **Сохранение кастомных ключей TOML** — парсер `dcr.toml` переведен на `toml_edit`, что гарантирует сохранение всех неизвестных/пользовательских ключей, комментариев и форматирования при перезаписи файла (например, через `dcr add`).
+- **Разрешение заголовков для локальных path-зависимостей** — исправлена проблема, при которой потребители не могли найти заголовочные файлы статических/динамических библиотек, лежащие в упакованной папке `target/include` локальных path-зависимостей.
+- **Новая система интеграционных тестов** — старый громоздкий файл `tests/cli_basic.rs` разделен на изолированные и структурированные интеграционные тесты для каждой команды и фичи: `cli_build.rs`, `cli_deps.rs`, `cli_lint.rs`, `cli_new.rs`, `cli_qt.rs`, `cli_test.rs`, `cli_workspace.rs`.
+
+**Изменено:**
+
+- **Дедупликация генерации артефактов** — логика линковки бинарных файлов (ELF, PE, EXE), динамических библиотек (`.so`, `.dll`, `.dylib`) и архивации статических библиотек (`.a`, `.lib`) полностью перенесена в выделенный модуль `src/core/build/builder/artifact.rs`.
+- **Запуск членов workspace из корня** — команда `dcr run` при вызове из корня workspace-only проекта теперь запускает сборку выбранного пакета в контексте workspace (через флаг `--workspace`), исключая изолированные ошибки сборки.
+- **Отказ от глобального состояния** — все операции сборки изолированы внутри структуры `BuildContext`, обеспечивая многопоточную безопасность сборщика.
+- **Вынос логики кэширования** — проверка инкрементальных изменений, отслеживание заголовков (`#include`) и вычисление хэшей сборки перенесено в изолированный модуль `src/core/build/cache.rs`.
+- **Модуляризация кастомных шагов** — обработка этапа `build.steps` для препроцессоров вынесена в `src/core/build/steps.rs`.
+
+### EN
+
+**Added:**
+
+- **Dedicated Build Engine (`src/core/build/engine.rs`)** — decoupled the build orchestration logic completely from the CLI front-end wrapper in `src/cli/build.rs` to a reusable, decoupled core build engine.
+- **Polymorphic Language Model (`Language` trait)** — introduced the abstract `Language` trait (`src/core/build/language/mod.rs`). File scanning, compiler resolution, and flags handling are now encapsulated in dedicated language modules for C, C++ (including Qt code generation), LLVM IR, and ASM (GAS, NASM, FASM, MASM).
+- **Polymorphic Compilation Dispatch (`Builder` trait)** — introduced the `Builder` trait to generalize builder invocations (`src/core/build/builder/mod.rs`). Consolidated GCC/Clang logic into `builder/cc_common.rs` and Microsoft Visual C++ logic into `builder/msvc/`.
+- **Per-Language Configuration overrides (`[build.<lang>]`)** — introduced support for configuring language-specific compiler, standard, and flags (e.g. `[build.c]`, `[build.cpp]`, `[build.asm]`) independently in `dcr.toml`.
+- **Automatic Workspace Dependency Injection** — during workspace builds, include/lib paths of dependent workspace members (including their source headers, local `include/` folders, and build target `target/include` / `target/lib` folders) are automatically resolved and injected.
+- **`BuildReporter` Event System** — decoupled build orchestration output into a structured event-driven reporter model (`src/core/build/report.rs`), making DCR suitable for library embedding and IDE integrations without stderr capturing.
+- **Build Cancellation Support** — introduced thread-safe cancellation tokens (`Arc<AtomicBool>`) allowing clients to safely abort compile runs mid-execution.
+- **TOML Formatting & Custom Keys Preservation** — migrated the config editor to `toml_edit`, preserving all unknown/user-defined TOML keys, structures, and comments during file write operations (e.g., in `dcr add`).
+- **Path Dependencies Target Include Resolution** — local path dependencies configured via tables now correctly expose headers built and packaged into their `target/include` folder to consumer packages.
+- **Modular Integration Test Suite** — refactored the monolith `tests/cli_basic.rs` file into clean, specialized integration tests: `cli_build.rs`, `cli_deps.rs`, `cli_lint.rs`, `cli_new.rs`, `cli_qt.rs`, `cli_test.rs`, `cli_workspace.rs`.
+
+**Changed:**
+
+- **Consolidated Linking and Archiving** — artifact generation (linking executables/shared libraries and archiving static libraries) consolidated into a single `src/core/build/builder/artifact.rs` module.
+- **Workspace-Aware member execution** — `dcr run` executed at the workspace root of a `workspace_only` project now triggers the member build inside the workspace context using the `--workspace` parameter, preventing standalone build issues.
+- **Elimination of Global State** — removed global variables and states from the build core, encapsulating build logic inside isolated `BuildContext` structs for thread safety.
+- **Build Cache Separation** — relocated mtime tracking, incremental caching, and header-dependency checking logic to `src/core/build/cache.rs`.
+- **Modularized Pre-build Steps** — decoupled generator scripts and pre-build commands parsing into `src/core/build/steps.rs`.
+
 ## [0.7.4] - 2026-06-17 "Qt Поддержка, Linting и Рефакторинг Архитектуры / Qt Support, Linting, & Architecture Refactor"

 ### RU
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,18 +2,39 @@
 # It is not intended for manual editing.
 version = 4

+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"

+[[package]]
+name = "autocfg"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2032f911046de80f0a198e0901378627c33f59ea0ac00e363d481118bd70a53"
+
 [[package]]
 name = "base64"
 version = "0.22.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"

+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
 [[package]]
 name = "bitflags"
 version = "2.11.1"
@@ -38,6 +59,28 @@ dependencies = [
 "objc2",
 ]

+[[package]]
+name = "bumpalo"
+version = "3.20.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72f5acc6cb2ba439de613abc23857ec3d78374d8ed5ac84e9d11336e87da8649"
+
+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
+[[package]]
+name = "cc"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c89588d05638b5b4594a3348a2d6c20277e43a7f5c5202b05cc56888475a47b8"
+dependencies = [
+ "find-msvc-tools",
+ "shlex",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.4"
@@ -50,6 +93,19 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"

+[[package]]
+name = "chrono"
+version = "0.4.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1aa79e62e7697b8e29b513a68abacf485adcd1fe8284a4316c5ae868e6633327"
+dependencies = [
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "wasm-bindgen",
+ "windows-link",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.4"
@@ -98,15 +154,17 @@ dependencies = [

 [[package]]
 name = "dcr"
-version = "0.7.4"
+version = "0.8.1"
 dependencies = [
 "ctrlc",
+ "fatfs",
 "glob",
 "self-replace",
 "serde",
 "serde_json",
 "sha2",
 "toml",
+ "toml_edit",
 "ureq",
 ]

@@ -126,7 +184,7 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1e0e367e4e7da84520dedcac1901e4da967309406d1e51017ae1abfb97adbd38"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
 "block2",
 "libc",
 "objc2",
@@ -165,6 +223,24 @@ version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9f1f227452a390804cdb637b74a86990f2a7d7ba4b7d5693aac9b4dd6defd8d6"

+[[package]]
+name = "fatfs"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05669f8e7e2d7badc545c513710f0eba09c2fbef683eb859fd79c46c355048e0"
+dependencies = [
+ "bitflags 1.3.2",
+ "byteorder",
+ "chrono",
+ "log",
+]
+
+[[package]]
+name = "find-msvc-tools"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
+
 [[package]]
 name = "foldhash"
 version = "0.1.5"
@@ -180,6 +256,30 @@ dependencies = [
 "percent-encoding",
 ]

+[[package]]
+name = "futures-core"
+version = "0.3.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2cd50c473c80f6d7c3670a752354b8e569b1a7cbfdc0419ec88e5edad85e0dc7"
+
+[[package]]
+name = "futures-task"
+version = "0.3.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b231ed28831efb4a61a08580c4bc233ec56bc009f4cd8f52da2c3cb97df0c109"
+
+[[package]]
+name = "futures-util"
+version = "0.3.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a77a90a256fce34da66415271e30f94ee91c57b04b8a2c042d9cf3220179deaa"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "pin-project-lite",
+ "slab",
+]
+
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -230,6 +330,30 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"

+[[package]]
+name = "iana-time-zone"
+version = "0.1.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e31bc9ad994ba00e440a8aa5c9ef0ec67d5cb5e5cb0cc7f8b744a35b389cc470"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "log",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "icu_collections"
 version = "2.2.0"
@@ -357,6 +481,17 @@ version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"

+[[package]]
+name = "js-sys"
+version = "0.3.103"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53b44bfcdb3f8d5837a46dae1ca9660a837176eee74a28b229bc626816589102"
+dependencies = [
+ "cfg-if",
+ "futures-util",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "leb128fmt"
 version = "0.1.0"
@@ -399,12 +534,21 @@ version = "0.31.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf20d2fde8ff38632c426f1165ed7436270b44f199fc55284c38276f9db47c3d"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
 "cfg-if",
 "cfg_aliases",
 "libc",
 ]

+[[package]]
+name = "num-traits"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "objc2"
 version = "0.6.4"
@@ -438,6 +582,12 @@ version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"

+[[package]]
+name = "pin-project-lite"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a89322df9ebe1c1578d689c92318e070967d1042b512afbe49518723f4e6d5cd"
+
 [[package]]
 name = "potential_utf"
 version = "0.1.5"
@@ -487,7 +637,7 @@ version = "1.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6fe4565b9518b83ef4f91bb47ce29620ca828bd32cb7e408f0062e9930ba190"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
 "errno",
 "libc",
 "linux-raw-sys",
@@ -525,6 +675,12 @@ dependencies = [
 "zeroize",
 ]

+[[package]]
+name = "rustversion"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf54715a573b99ac80df0bc206da022bcd442c974952c7b9720069370852e21f"
+
 [[package]]
 name = "schannel"
 version = "0.1.29"
@@ -540,7 +696,7 @@ version = "2.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "897b2245f0b511c87893af39b033e5ca9cce68824c4d7e7630b5a1d339658d02"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
 "core-foundation",
 "core-foundation-sys",
 "libc",
@@ -637,6 +793,18 @@ dependencies = [
 "digest",
 ]

+[[package]]
+name = "shlex"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8fadd59c855ef2080decdef8ff161eb6661b86933c9d82e5ba29dc602a55aba"
+
+[[package]]
+name = "slab"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c790de23124f9ab44544d7ac05d60440adc586479ce501c1d6d7da3cd8c9cf5"
+
 [[package]]
 name = "smallvec"
 version = "1.15.1"
@@ -703,12 +871,18 @@ dependencies = [
 "indexmap",
 "serde_core",
 "serde_spanned",
- "toml_datetime",
+ "toml_datetime 1.1.1+spec-1.1.0",
 "toml_parser",
 "toml_writer",
- "winnow",
+ "winnow 1.0.3",
 ]

+[[package]]
+name = "toml_datetime"
+version = "0.6.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22cddaf88f4fbc13c51aebbf5f8eceb5c7c5a9da2ac40a13519eb5b0a0e8f11c"
+
 [[package]]
 name = "toml_datetime"
 version = "1.1.1+spec-1.1.0"
@@ -718,15 +892,33 @@ dependencies = [
 "serde_core",
 ]

+[[package]]
+name = "toml_edit"
+version = "0.22.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41fe8c660ae4257887cf66394862d21dbca4a6ddd26f04a3560410406a2f819a"
+dependencies = [
+ "indexmap",
+ "toml_datetime 0.6.11",
+ "toml_write",
+ "winnow 0.7.15",
+]
+
 [[package]]
 name = "toml_parser"
 version = "1.1.2+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2abe9b86193656635d2411dc43050282ca48aa31c2451210f4202550afb7526"
 dependencies = [
- "winnow",
+ "winnow 1.0.3",
 ]

+[[package]]
+name = "toml_write"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d99f8c9a7727884afe522e9bd5edbfc91a3312b36a77b5fb8926e4c31a41801"
+
 [[package]]
 name = "toml_writer"
 version = "1.1.1+spec-1.1.0"
@@ -808,6 +1000,51 @@ dependencies = [
 "wit-bindgen 0.51.0",
 ]

+[[package]]
+name = "wasm-bindgen"
+version = "0.2.126"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4b067c0c11094aef6b7a801c1e34a26affafdf3d051dba08456b868789aaf9a4"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "rustversion",
+ "wasm-bindgen-macro",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.126"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "167ce5e579f6bcf889c4f7175a8a5a585de84e8ff93976ce393efa5f2837aab1"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.126"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3997c7839262f4ef12cf90b818d6340c18e80f263f1a94bf157d0ec4420380e"
+dependencies = [
+ "bumpalo",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.126"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc1b4cb0cc549fcf58d7dfc081778139b3d283a081644e833e84682ad71cea24"
+dependencies = [
+ "unicode-ident",
+]
+
 [[package]]
 name = "wasm-encoder"
 version = "0.244.0"
@@ -836,18 +1073,71 @@ version = "0.244.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
 "hashbrown 0.15.5",
 "indexmap",
 "semver",
 ]

+[[package]]
+name = "windows-core"
+version = "0.62.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8e83a14d34d0623b51dce9581199302a221863196a1dde71a7663a4c2be9deb"
+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.60.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.59.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"

+[[package]]
+name = "windows-result"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7781fa89eaf60850ac3d2da7af8e5242a5ea78d1a11c49bf2910bb5a73853eb5"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-strings"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
+dependencies = [
+ "windows-link",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"
@@ -930,6 +1220,15 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"

+[[package]]
+name = "winnow"
+version = "0.7.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df79d97927682d2fd8adb29682d1140b343be4ac0f08fd68b7765d9c059d3945"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "winnow"
 version = "1.0.3"
@@ -1000,7 +1299,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
 dependencies = [
 "anyhow",
- "bitflags",
+ "bitflags 2.11.1",
 "indexmap",
 "log",
 "serde",
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "dcr"
-version = "0.7.4"
+version = "0.8.1"
 edition = "2024"
 build = "build.rs"
 description = "DCR is a utility for managing C/C++ projects in a Cargo-like style."
@@ -66,8 +66,10 @@ serde = { version = "1", features = ["derive"] }
 self-replace = "1"
 sha2 = "0.10"
 toml = "1.0.3"
+toml_edit = "0.22"
 serde_json = "1"
 ctrlc = "3"
+fatfs = "0.3"

 [profile.release]
 opt-level = "z"
--- a/TODO.md
+++ b/TODO.md
@@ -23,8 +23,8 @@ Priority list of tasks to turn DCR into a true Cargo killer for C/C++ developers

 - [ ] **Static analysis** (`dcr check`)  
  Integration with clang-tidy, cppcheck, include-what-you-use
- [-] **Linter + Formatter** (`dcr fmt`, `dcr lint`)  
-  *`dcr fmt` (clang-format) implemented; `dcr lint` does not exist yet*
+- [x] **Linter + Formatter** (`dcr fmt`, `dcr lint`)  
+  *`dcr fmt` (clang-format) and `dcr lint` (clang-tidy) are implemented*
 - [ ] **Hot reload / Live reload** for applications (raylib, SFML, SDL, etc.)
 - [-] **Workspaces improvements** Per-member include directories, selective builds, better dependency graph  
  *Basic workspaces with dep ordering + topological sort work; advanced features missing*
--- a/docs/README.mdx
+++ b/docs/README.mdx
@@ -51,8 +51,9 @@ dcr gen vscode

 - **Incremental builds** — mtime + `.d` headers + SHA256 fingerprint
 - **Parallel compilation** — thread::scope, atomic task queue
- **4 backends** — gcc/clang, MSVC/clang-cl, GAS (ARM), NASM (x86)
- **7 project kinds** — bin, staticlib, sharedlib, efi, elf, none, custom
+- **7 backends** — gcc/clang (unix_cc), MSVC/clang-cl (msvc), GAS, NASM, MASM, FASM, LLVM IR
+- **8 project kinds** — bin, staticlib, sharedlib, efi, elf, none, custom, flat-bin
+- **Disk images** — optional `[archive]` packs FAT12/16/32 images after build
 - **Cross-compilation** — short names and full triples
 - **Profiles** — debug / release with field overrides
 - **Workspaces** — multi-package projects with topological sort
--- a/docs/changelog.mdx
+++ b/docs/changelog.mdx
@@ -4,6 +4,108 @@ sidebar_label: Changelog

 # Changelog

+## 0.8.1 (2026-07-20)
+
+### Added
+
+- **`build.kind = "flat-bin"`** — raw binary (default `.bin`) for OS-dev payloads:
+  - **NASM** — `-f bin` → `<stem>.bin`
+  - **FASM** — direct output (`format binary` in source)
+  - **GAS / MASM / LLC** — object → `objcopy -O binary` → `<stem>.bin`
+  - **C/C++** — objects → freestanding link → `objcopy -O binary` → `<name>.bin`
+  - Requires `llvm-objcopy` / `objcopy` / `gobjcopy` except for NASM/FASM direct emit
+- **`[archive]` section** — after a successful build, pack a FAT disk image (`fatfs`): `output`, `format` (`fat12`/`fat16`/`fat32`), optional `size` (default 1.44 MiB), `offset`, `label`, `bootsector`, and `layout` (`from` → `to`, supports globs). `{profile}` works in paths.
+- **Single-file `build.roots`** — a root may be a single source or header file, not only a directory.
+
+### Changed
+
+- **`--force`** also re-runs `build.steps` and `build.post_steps`.
+- **`dcr run` on workspace-only root** — if `[run].cmd` is set, run that after build; otherwise delegate to a workspace member.
+
+### Dependencies
+
+- `fatfs = "0.3"` for FAT image packing.
+
+## 0.8.0 (2026-07-18)
+
+### Added
+
+- **Dedicated Build Engine (`src/core/build/engine.rs`)** — decoupled the build orchestration logic completely from the CLI front-end wrapper in `src/cli/build.rs` to a reusable, decoupled core build engine.
+- **Polymorphic Language Model (`Language` trait)** — introduced the abstract `Language` trait (`src/core/build/language/mod.rs`). File scanning, compiler resolution, and flags handling are now encapsulated in dedicated language modules for C, C++ (including Qt code generation), LLVM IR, and ASM (GAS, NASM, FASM, MASM).
+- **Polymorphic Compilation Dispatch (`Builder` trait)** — introduced the `Builder` trait to generalize builder invocations (`src/core/build/builder/mod.rs`). Consolidated GCC/Clang logic into `builder/cc_common.rs` and Microsoft Visual C++ logic into `builder/msvc/`.
+- **Per-Language Configuration overrides (`[build.<lang>]`)** — introduced support for configuring language-specific compiler, standard, and flags (e.g. `[build.c]`, `[build.cxx]`, `[build.asm]`) independently in `dcr.toml`.
+- **Automatic Workspace Dependency Injection** — during workspace builds, include/lib paths of dependent workspace members (including their source headers, local `include/` folders, and build target `target/include` / `target/lib` folders) are automatically resolved and injected.
+- **`BuildReporter` Event System** — decoupled build orchestration output into a structured event-driven reporter model (`src/core/build/report.rs`), making DCR suitable for library embedding and IDE integrations without stderr capturing.
+- **Build Cancellation Support** — introduced thread-safe cancellation tokens (`Arc<AtomicBool>`) allowing clients to safely abort compile runs mid-execution.
+- **TOML Formatting & Custom Keys Preservation** — migrated the config editor to `toml_edit`, preserving all unknown/user-defined TOML keys, structures, and comments during file write operations (e.g., in `dcr add`).
+- **Path Dependencies Target Include Resolution** — local path dependencies configured via tables now correctly expose headers built and packaged into their `target/include` folder to consumer packages.
+- **Modular Integration Test Suite** — refactored the monolith `tests/cli_basic.rs` file into clean, specialized integration tests: `cli_build.rs`, `cli_deps.rs`, `cli_lint.rs`, `cli_new.rs`, `cli_qt.rs`, `cli_test.rs`, `cli_workspace.rs`.
+
+### Changed
+
+- **Consolidated Linking and Archiving** — artifact generation (linking executables/shared libraries and archiving static libraries) consolidated into a single `src/core/build/builder/artifact.rs` module.
+- **Workspace-Aware member execution** — `dcr run` executed at the workspace root of a `workspace_only` project now triggers the member build inside the workspace context using the `--workspace` parameter, preventing standalone build issues.
+- **Elimination of Global State** — removed global variables and states from the build core, encapsulating build logic inside isolated `BuildContext` structs for thread safety.
+- **Build Cache Separation** — relocated mtime tracking, incremental caching, and header-dependency checking logic to `src/core/build/cache.rs`.
+- **Modularized Pre-build Steps** — decoupled generator scripts and pre-build commands parsing into `src/core/build/steps.rs`.
+
+## 0.7.4 (2026-06-17)
+
+### Added
+
+- **Native Qt support** — automatic meta-object handling (MOC, UIC, RCC) added when `build.qt = true` is set in `dcr.toml`.
+- **`dcr lint` command** — C/C++ static analysis via `clang-tidy`. Supports `--fix` for automatic fixes. Respects `build.roots` and `build.src_disable` from config.
+- **Three new assembler backends**:
+  - **MASM** (`compiler = "ml"` / `"ml64"`) — Microsoft Macro Assembler.
+  - **FASM** (`compiler = "fasm"`) — Flat Assembler.
+  - **LLVM IR** (`compiler = "llc"`) — compiles `.ll` files via `llc -filetype=obj`.
+- **Shared ASM pipeline** — linking and archiving logic consolidated into `core/builder/asm.rs`. Adding a new assembler backend now takes ~30 lines.
+- **Filesystem utilities** — `to_hex()` and `home_dir()` extracted to `utils/fs.rs`.
+- **Build utilities** — `normalize_target()`, `normalize_kind()`, `normalize_platform()`, `default_profile_flags()` extracted to `utils/build.rs`.
+- **Backend helpers** — `asm_lang_flag()`, `source_extensions()`, `elapsed_secs()` added to `core/builder/common.rs`.
+- **Full Bare-Metal / Freestanding Automation** — introduced the `build.freestanding = true` configuration option. When enabled (or when a bare-metal target is detected), DCR automatically injects `-ffreestanding` during compilation and both `-nostdlib` and `-static` during linking.
+- **Artifact Optimization (LTO & Strip)** — added `build.lto` (auto-injects `-flto` for compiler and linker) and `build.strip` (automatically strips debug symbols via linker `-s` flag) options to `dcr.toml`.
+- **Compilation Thread Control** — added the `build.codegen-units` option to strictly limit the maximum number of parallel jobs utilized by the custom `parallel_build` worker pool.
+- **Panic Behavior Management** — added `build.panic = "abort"` support. For C++ targets, it automatically strips exception handling and unwind tables via `-fno-exceptions`, `-fno-unwind-tables`, and `-fno-asynchronous-unwind-tables`.
+
+### Changed
+
+- **Intelligent Default Flags Generation** — automated injection of fallback optimization (`-O3`/`-O0`), debug (`-g`), and warning (`-Wall -Wextra`) flags is now suppressed for bare-metal and freestanding builds if `build.cflags` are overridden.
+- **Centralized Bare-Metal Detection** — relocated the `is_bare_metal_target` helper to common build utilities (`src/utils/build.rs`) for unified access across the building core.
+- **Architectural Refactoring**:
+  - Renamed `src/config.rs` to `src/templates.rs`.
+  - Started consolidation of configuration and build orchestration logic.
+
+## 0.7.3 (2026-06-13)
+
+### Added
+
+- **`--vcs` option for `new` and `init` commands** — introduced explicit version control system selection via `--vcs <git|none>`.
+- **Git metadata integration in `--version`** — the CLI now appends the current short commit hash and a `-dirty` suffix if there are uncommitted changes in the DCR repository.
+- **Automatic `.gitignore` generation** — Git repository initialization now automatically writes a `.gitignore` file excluding the `/target` directory.
+- **Nested repository prevention** — automatic Git initialization is now skipped if `dcr new` or `dcr init` is executed inside an already existing Git repository.
+- **VCS verification tests** — added `new_vcs_options_work` and `init_vcs_options_work` integration tests to ensure reliable repository behavior.
+
+### Changed
+
+- **Complete removal of `git2` dependency** — all Git actions (dependency fetching, VCS setup, status checks) are now delegated to the system `git` executable via `Command`. This simplifies compilation and drops the need for `vendored` and `openssl` features.
+- **Migrated from `reqwest` to `ureq`** — replaced the heavy `reqwest` crate in `flag_update.rs` with the lightweight synchronous `ureq 2.10` client, reducing overhead and the final binary size.
+
+## 0.7.2 (2026-06-07)
+
+### Added
+
+- `default_target_triple()` now respects `target_env` — Linux (gnu/musl) and Windows (msvc/gnu) use the correct environment instead of hardcoded values.
+
+### Fixed
+
+- **macOS Apple Silicon builds failed with `_main` undefined** — `--target=` is now passed to ldflags, not just cflags. `default_target_triple()` uses `std::env::consts::ARCH` on macOS instead of hardcoded `x86_64`.
+- **GitHub Stars and GPL-3.0 badges not rendering in README** — badge block converted to pure HTML.
+
+### Changed
+
+- Default target resolution extracted into shared `default_target_triple()` — removed duplication across build, run, clean.
+
 ## 0.7.1 (2026-06-02)

 ### Added
--- a/docs/commands/build-commands.mdx
+++ b/docs/commands/build-commands.mdx
@@ -13,7 +13,7 @@ dcr build                         # debug profile
 dcr build --release               # release build
 dcr build --debug                 # explicit debug
 dcr build --target aarch64-unknown-linux-gnu
-dcr build --force                 # full rebuild
+dcr build --force                 # full rebuild (also re-runs build.steps / post_steps)
 dcr build --clean                 # clean + build
 dcr build --verbose               # show compilation commands
 dcr build --workspace pkg-a       # build specific workspace package
@@ -21,6 +21,8 @@ dcr build --workspace pkg-a       # build specific workspace package

 Artifacts: `target/<triple>/<profile>/<binary-name>` (Linux with explicit target).

+With `[archive]` in `dcr.toml`, a FAT disk image is packed after a successful build.
+
 ## `dcr run`

 Builds (if sources are newer than artifacts) and runs the binary.
@@ -28,8 +30,11 @@ Builds (if sources are newer than artifacts) and runs the binary.
 ```bash
 dcr run
 dcr run --release
+dcr run --force                   # force rebuild then run
 ```

+On a **workspace-only** root: if `[run].cmd` is set, that command is used after build; otherwise DCR delegates to a workspace member.
+
 ## `dcr clean`

 Removes `target/` directory (or `target/<target>/<profile>`).
--- a/docs/commands/project-commands.mdx
+++ b/docs/commands/project-commands.mdx
@@ -12,8 +12,12 @@ Only ASCII letters, digits, underscores `_` and hyphens `-` are allowed in the p

 ```bash
 dcr new my-app
+dcr new my-app --vcs none
 ```

+Flags:
+- `--vcs <git|none>` — Initialize version control system (defaults to `git` if available, or `none`).
+
 Generates:
 - `dcr.toml` with basic fields
 - `src/main.c` with a `main` template
@@ -23,8 +27,11 @@ Generates:
 Initializes a DCR project in the current (empty) directory.

 ```bash
-mkdir app && cd app
 dcr init
+dcr init --vcs none
 ```

+Flags:
+- `--vcs <git|none>` — Initialize version control system (defaults to `git` if available, or `none`).
+
 The project name is taken from the current directory name. The directory name must follow the same naming rules as `dcr new`.
--- a/docs/commands/system-commands.mdx
+++ b/docs/commands/system-commands.mdx
@@ -15,9 +15,9 @@ dcr setup
 If `~/.dcr/config.toml` is not found, DCR returns an error. Create it manually:

 ```toml
-[[registry]]
-name = "default"
+[registry.default]
 url = "https://index.dcr.pm"
+priority = 1
 ```

 ## `dcr --help`
--- a/docs/contributing.mdx
+++ b/docs/contributing.mdx
@@ -45,6 +45,6 @@ cargo test --all-targets
 CI runs:
 - `cargo fmt --check`
 - `cargo clippy --all-targets -- -D warnings`
- `cargo test --all-targets`
+- `cargo check --all-targets --all-features`
 - Build on Linux, macOS, Windows
- Integration tests
+- Integration tests (compilation check)
--- a/docs/faq.mdx
+++ b/docs/faq.mdx
@@ -13,9 +13,9 @@ error: registry not found
 **Solution:** Make sure `~/.dcr/config.toml` exists:

 ```toml
-[[registry]]
-name = "default"
+[registry.default]
 url = "https://index.dcr.pm"
+priority = 1
 ```

 And check `DCR_INDEX_PATH`:
@@ -39,27 +39,6 @@ which clang

 Or specify explicitly via `[toolchain]` in `dcr.toml`.

-## openssl-sys build failed
-
-When building DCR from source:
-
-```
-error: failed to run custom build command for openssl-sys
-```
-
-**Solution:** Install OpenSSL development headers:
-
-```bash
-# Ubuntu/Debian
-sudo apt install libssl-dev
-
-# Fedora
-sudo dnf install openssl-devel
-
-# macOS
-brew install openssl
-```
-
 ## Ctrl+C during build

 DCR handles SIGINT: interrupts the current compilation and exits with non-zero code.
@@ -76,6 +55,12 @@ See [Cross-Compile Recipe](/docs/recipes/cross-to-windows).

 See [Workspace Recipe](/docs/recipes/multi-package-workspace).

+## Bootloader / pure NASM OS image
+
+Use `kind = "flat-bin"` (NASM `-f bin`) and optional `[archive]` for a FAT disk image.
+
+See [OS-dev recipe](/docs/recipes/os-flat-bin-archive).
+
 ## Lock file

 `dcr.lock` is created during builds (`dcr build`) when registry dependencies are present. To force an update — delete `dcr.lock` and run `dcr build`.
--- a/docs/getting-started/first-steps.mdx
+++ b/docs/getting-started/first-steps.mdx
@@ -68,3 +68,11 @@ dcr test             # run tests
 ```bash
 dcr fmt              # clang-format with .clang-format
 ```
+
+## Linting
+
+```bash
+dcr lint             # clang-tidy checks
+dcr lint --fix       # apply fixes automatically
+```
+
--- a/docs/getting-started/installation.mdx
+++ b/docs/getting-started/installation.mdx
@@ -100,7 +100,7 @@ man dcr-build
 To use the registry, create `~/.dcr/config.toml`:

 ```toml
-[[registry]]
-name = "default"
+[registry.default]
 url = "https://index.dcr.pm"
+priority = 1
 ```
--- a/docs/license.mdx
+++ b/docs/license.mdx
@@ -10,36 +10,23 @@ DCR itself is [GPL-3.0-or-later](https://spdx.org/licenses/GPL-3.0-or-later.html

 > **Note:** DCR is a build tool, not a library. The GPL applies only to DCR's own source code. Projects built with DCR are not subject to DCR's license — their licensing is determined solely by their own code and dependencies.

-## Vendored libraries
-
-DCR statically links the following C libraries through its vendored Rust dependencies:
-
-| Library | License | Bundled by |
-|---|---|---|
-| [libgit2](https://libgit2.org) | MIT OR Apache-2.0 | `git2` / `libgit2-sys` |
-| [libssh2](https://libssh2.org) | MIT OR Apache-2.0 | `libgit2-sys` |
-| [zlib](https://zlib.net) | MIT OR Apache-2.0 | `libgit2-sys` |
-| [OpenSSL](https://openssl.org) | Apache-2.0 | `openssl-sys` / `openssl-src` |
-| [ring](https://github.com/briansmith/ring) | Apache-2.0 AND ISC | `rustls` |
-
 ## Rust dependencies

 DCR is written in Rust. The following notable Rust crates are statically linked:

 | Crate | License |
 |---|---|
-| [`reqwest`](https://crates.io/crates/reqwest) | MIT OR Apache-2.0 |
-| [`rustls`](https://crates.io/crates/rustls) | Apache-2.0 OR ISC OR MIT |
+| [`ureq`](https://crates.io/crates/ureq) | MIT OR Apache-2.0 |
 | [`serde`](https://crates.io/crates/serde) | MIT OR Apache-2.0 |
 | [`toml`](https://crates.io/crates/toml) | MIT OR Apache-2.0 |
+| [`toml_edit`](https://crates.io/crates/toml_edit) | MIT OR Apache-2.0 |
+| [`serde_json`](https://crates.io/crates/serde_json) | MIT OR Apache-2.0 |
 | [`sha2`](https://crates.io/crates/sha2) | MIT OR Apache-2.0 |
-| [`git2`](https://crates.io/crates/git2) | MIT OR Apache-2.0 |
-| [`openssl`](https://crates.io/crates/openssl) | Apache-2.0 |
-| [`tokio`](https://crates.io/crates/tokio) | MIT |
-| [`hyper`](https://crates.io/crates/hyper) | MIT |
+| [`glob`](https://crates.io/crates/glob) | MIT OR Apache-2.0 |
+| [`self-replace`](https://crates.io/crates/self-replace) | MIT OR Apache-2.0 |
 | [`ctrlc`](https://crates.io/crates/ctrlc) | MIT OR Apache-2.0 |

-Full dependency tree (143 packages) is available in [`Cargo.lock`](https://github.com/dexoron/dcr/blob/main/Cargo.lock). The overwhelming majority are dual-licensed under MIT OR Apache-2.0.
+Full dependency tree is available in [`Cargo.lock`](https://github.com/dexoron/dcr/blob/main/Cargo.lock). The overwhelming majority are dual-licensed under MIT OR Apache-2.0.

 ## Additional credits

--- a/docs/recipes/multi-package-workspace.mdx
+++ b/docs/recipes/multi-package-workspace.mdx
@@ -34,6 +34,7 @@ type = "none"
 inherit = true
 language = "c"
 standard = "c11"
+workspace_only = true

 [workspace.lib-core]
 path = "lib-core"
--- a/docs/recipes/os-flat-bin-archive.mdx
+++ b/docs/recipes/os-flat-bin-archive.mdx
@@ -0,0 +1,89 @@
+---
+sidebar_label: OS-dev (flat-bin + archive)
+---
+
+# Pure ASM / boot image (flat-bin + archive)
+
+Minimal OS-dev style pipeline: assemble raw binaries with NASM, then pack a FAT floppy/image with an optional boot sector.
+
+## Project layout
+
+```
+myos/
+  dcr.toml
+  src/
+    boot.asm      # boot sector (512 bytes)
+    kernel.asm    # payload
+```
+
+For multiple flat artifacts, use a **workspace** (one member per binary) or separate packages; a single `flat-bin` package produces one binary per source stem.
+
+## Boot package (`flat-bin`)
+
+```toml
+[package]
+name = "boot"
+version = "0.1.0"
+
+[build]
+language = "asm"
+compiler = "nasm"
+kind = "flat-bin"
+extension = "bin"
+roots = ["src/boot.asm"]
+```
+
+```bash
+dcr build
+# → target/<…>/debug/boot.bin  (NASM -f bin, no link)
+```
+
+## Disk image after build
+
+```toml
+[archive]
+output = "target/{profile}/disk.img"
+format = "fat12"
+size = "1440K"
+label = "MYOS"
+bootsector = "target/{profile}/boot.bin"
+
+[[archive.layout]]
+from = "target/{profile}/kernel.bin"
+to = "KERNEL.BIN"
+```
+
+- `format`: `fat12`, `fat16`, or `fat32`
+- `size`: bytes or `K`/`KB`/`M`/`MB`/`G`/`GB` (default ~1.44 MiB)
+- `bootsector`: written only when `offset` is omitted or `0`
+- `from` may be a glob; `{profile}` is substituted in paths
+
+## C kernel → flat binary
+
+```toml
+[build]
+language = "c"
+compiler = "clang"
+kind = "flat-bin"
+freestanding = true
+filename = "kernel"
+extension = "bin"
+ldflags = ["-T", "linker.ld"]
+```
+
+Pipeline: objects → temporary linked ELF → `objcopy -O binary` → `kernel.bin`. Requires `objcopy` / `llvm-objcopy` in PATH.
+
+## Other assemblers
+
+| Tool | Notes |
+|------|--------|
+| **FASM** | Write `format binary` in the source; DCR writes `<stem>.bin` directly |
+| **GAS** | Assemble `.s` → obj → `objcopy -O binary` |
+| **LLC** | `language = "llvm_ir"` → obj → objcopy |
+| **MASM** | COFF obj → objcopy (needs binutils/LLVM objcopy) |
+
+## Notes
+
+- Single-file `roots` are supported: `roots = ["src/boot.asm"]`.
+- `--force` re-runs `build.steps` / `build.post_steps` as well as recompilation.
+- Prefer `kind = "elf"` if you need a relocatable ELF kernel without stripping to raw binary.
--- a/docs/reference/build-system.mdx
+++ b/docs/reference/build-system.mdx
@@ -56,7 +56,7 @@ moc = "moc {in} -o {out}"
 ### GAS / NASM / MASM / FASM / LLVM-IR

 - GAS: `-I`, `-c -o`, `--defsym`
- NASM: `-I`, `-o`, `-D`, `-f` (format: win64/elf64/macho64/macho32/elf32)
+- NASM: `-I`, `-o`, `-D`, `-f` (format: win64/elf64/macho64/macho32/elf32; **`bin` when `kind = "flat-bin"`**)
 - MASM: `/nologo /c /Fo<obj> <source>`
 - FASM: `<source> <output>` (output path is the object file)
 - LLVM IR: `-filetype=obj <source> -o <output>`
@@ -87,6 +87,11 @@ Three levels of incrementality:
 | `elf` | ELF without stdlib | `target/<triple>/<profile>/<name>` |
 | `none` | Compile only, no link | — |
 | `custom` | Full filename+extension control | `target/<triple>/<profile>/<filename>.<extension>` |
+| `flat-bin` | Raw binary | ASM: `<stem>.bin` (NASM `-f bin` / FASM / GAS·MASM·LLC via objcopy); C/C++: `<name>.bin` (link + objcopy) |
+
+## Disk images (`[archive]`)
+
+After a successful build, if `[archive]` is present in `dcr.toml`, DCR formats a FAT volume and copies files from `layout` into the image. See [dcr.toml → archive](/docs/reference/dcr-toml#archive).

 ## Build Steps

--- a/docs/reference/cross-compilation.mdx
+++ b/docs/reference/cross-compilation.mdx
@@ -57,14 +57,8 @@ dcr build --target aarch64-none-elf

 ## Target Directory

-On Linux with explicit target:
+By default, the compilation output directories are structured as follows:

-```
-target/<triple>/<profile>/
-```
-
-On macOS/Windows or without target:
-
-```
-target/<profile>/
-```
+- **Linux and BSD**: Always output to `target/<triple>/<profile>/` (using host triple if no target is specified).
+- **macOS and Windows (without target)**: Output to `target/<profile>/`.
+- **macOS and Windows (with explicit target)**: Output to `target/<triple>/<profile>/`.
--- a/docs/reference/dcr-toml.mdx
+++ b/docs/reference/dcr-toml.mdx
@@ -33,6 +33,9 @@ Main project configuration file. Located at the project root.

 [run]
 # run settings
+
+[archive]
+# optional: pack FAT disk image after build
 ```

 ## [package]
@@ -41,7 +44,7 @@ Main project configuration file. Located at the project root.
 |-------|----------|-------------|
 | `name` | yes | Project name |
 | `version` | yes | Semantic version |
-| `type` | yes | `app`, `lib`, `none` |
+| `type` | no | `app`, `lib`, `none` (defaults to `"none"`) |
 | `license` | no | SPDX license identifier |
 | `author` | no | Author |

@@ -62,31 +65,31 @@ author = "John Doe"

 | Field | Default | Description |
 |-------|---------|-------------|
-| `language` | `"c"` | `"c"`, `"c++"`, `"cpp"`, `"cxx"`, `"asm"` |
+| `language` | `"c"` | `"c"`, `"c++"`, `"cpp"`, `"cxx"`, `"asm"`, `"llvm_ir"`, `"llvm-ir"`, `"ll"` (optional, defaults to `"c"`) |
 | `standard` | `"c11"` | C standard (`c11`, `c17`, `c23`) |
-| `cxx_standard` | `"c++20"` | C++ standard (`c++17`, `c++20`, `c++23`) |
-| `compiler` | `"clang"` | Preferred compiler |
-| `kind` | `"bin"` | `bin`, `staticlib`, `sharedlib`, `efi`, `elf`, `none`, `custom` |
+| `cxx_standard` | — | C++ standard (`c++17`, `c++20`, `c++23`) |
+| `compiler` | `"clang"` | Preferred compiler (optional, defaults to `"clang"`) |
+| `kind` | `"bin"` | `bin`, `staticlib`, `sharedlib`, `efi`, `elf`, `none`, `custom`, `flat-bin` |
 | `target` | host | Target triple for cross-compilation |
 | `platform` | `"native"` | `native`, `efi` |
 | `cflags` | `[]` | Additional C/C++/ASM flags |
 | `ldflags` | `[]` | Additional linker flags |
 | `filename` | `""` | Custom output file name |
-| `extension` | `""` | Custom file extension |
-| `roots` | `["src"]` | Source root directories |
+| `extension` | `""` | Custom file extension (for `flat-bin`, default is `bin`) |
+| `roots` | `["src"]` | Source roots: directories and/or individual source/header files |
 | `exclude` | `[]` | Exclude patterns |
 | `include` | `[]` | Additional include directories |
 | `src_disable` | `false` | Disable auto source discovery |
 | `inherit` | `false` | Inherit build from workspace root |
 | `clean` | `[]` | Glob patterns for custom clean paths |
 | `out_dir` | `""` | Custom output directory |
-| `workspace_only` | `false` | Workspace-only, not built standalone |
+| `workspace_only` | `false` | Workspace-only, not built standalone (no `language`/`compiler` required) |
 | `freestanding` | `false` | Compile in freestanding mode (`-ffreestanding` + `-nostdlib -static`) |
-| `opt_level` | `"0"` (debug) / `"3"` (release) | Optimization level: `0`-`3`, `"s"`, `"z"` |
-| `debug` | `true` (debug) / `false` (release) | Emit debug symbols (`-g`) |
+| `opt_level` | — | Optimization level: `0`-`3`, `"s"`, `"z"` (derived from profile if omitted) |
+| `debug` | profile-based | Emit debug symbols (`-g`): `true` in debug, `false` in release |
 | `lto` | `false` | Link-time optimization (`-flto` for both compiler and linker) |
 | `strip` | `false` | Strip symbols from output (`-s` in ldflags) |
-| `warnings` | `["all", "extra"]` (debug) / `[]` (release) | Warning flags (e.g. `"all"`, `"extra"`, `"pedantic"`) |
+| `warnings` | `[]` | Warning flags (e.g. `"all"`, `"extra"`, `"pedantic"`); engine adds `-Wall -Wextra` in debug if empty |
 | `panic` | `""` | Panic strategy: `"abort"` disables exceptions and unwind tables |
 | `codegen-units` | `""` | Max parallel compilation jobs (`"0"` = auto) |
 | `qt` | `false` | Enable automatic Qt meta-object handling (MOC, UIC, RCC) |
@@ -96,6 +99,33 @@ Settings from raw config (not in typed struct):
 - `ldscript` — linker script path
 - `build.steps` / `build.post_steps` — codegen steps

+## Per-language overrides: `[build.c]`, `[build.cxx]`, `[build.asm]`, `[build.llvm_ir]`
+
+Each language can have its own table that overrides the flat `[build]` settings:
+
+```toml
+[build]
+compiler = "clang"
+standard = "c11"
+
+[build.c]
+standard = "c23"
+compiler = "gcc"
+
+[build.cxx]
+standard = "c++23"
+compiler = "g++"
+
+[build.asm]
+compiler = "nasm"
+flags = ["-felf64"]
+
+[build.llvm_ir]
+compiler = "llc"
+```
+
+The flat `[build]` acts as fallback; per-language tables take precedence for their language.
+
 Example:

 ```toml
@@ -148,3 +178,82 @@ Default `cmd` = `./target/{profile}/{name}` (macOS/Windows) or `./target/<triple
 ## [workspace]

 See [workspaces](/docs/reference/workspaces).
+
+## [archive]
+
+Optional post-build step: format a FAT volume and copy built artifacts into a disk image. Runs after a successful package build (and after workspace member builds that define `[archive]`).
+
+| Field | Required | Description |
+|-------|----------|-------------|
+| `output` | yes | Image path relative to project root (`{profile}` allowed) |
+| `format` | yes | `fat12`, `fat16`, or `fat32` |
+| `size` | no | Image size: bytes or `K`/`KB`/`M`/`MB`/`G`/`GB` (default `1474560` ≈ 1.44 MiB) |
+| `offset` | no | Byte offset of the FAT volume inside the image (default `0`) |
+| `label` | no | Volume label (max 11 chars, default `VOLUME`) |
+| `bootsector` | no | Path to a 512-byte boot sector written at offset 0 when `offset` is 0 (`{profile}` allowed) |
+| `layout` | no | List of `{ from, to }` entries (files or globs → path inside the volume) |
+
+```toml
+[archive]
+output = "target/{profile}/disk.img"
+format = "fat12"
+size = "1440K"
+label = "MYOS"
+bootsector = "target/{profile}/boot.bin"
+
+[[archive.layout]]
+from = "target/{profile}/kernel.bin"
+to = "KERNEL.BIN"
+
+[[archive.layout]]
+from = "assets/*"
+to = "/"
+```
+
+Typical pairing with `kind = "flat-bin"` (NASM `-f bin`) for bootloaders and pure-ASM OS images.
+
+## `flat-bin` (kind)
+
+Produces a raw binary (default extension `bin`) for boot sectors, kernels, and freestanding payloads.
+
+### Assemblers
+
+| Tool | Language / compiler | How flat-bin is produced |
+|------|---------------------|--------------------------|
+| NASM | `language = "asm"`, `compiler = "nasm"` | `-f bin` → `<stem>.bin` |
+| FASM | `compiler = "fasm"` | direct write (use `format binary` in source) |
+| GAS | `compiler = "as"` / `"gas"` | assemble → `objcopy -O binary` |
+| MASM | `compiler = "ml"` / `"ml64"` | assemble → `objcopy -O binary` |
+| LLC | `language = "llvm_ir"`, `compiler = "llc"` | `-filetype=obj` → `objcopy -O binary` |
+
+```toml
+[build]
+language = "asm"
+compiler = "nasm"
+kind = "flat-bin"
+extension = "bin"
+roots = ["src/boot.asm"]
+```
+
+### C / C++
+
+Compile all sources, link with `-nostdlib -static` (plus your `ldflags` / `ldscript`), then convert the intermediate ELF/PE with `objcopy -O binary` to `<filename|name>.bin`.
+
+```toml
+[build]
+language = "c"
+compiler = "clang"
+kind = "flat-bin"
+freestanding = true
+filename = "kernel"
+extension = "bin"
+ldscript = "linker.ld"
+ldflags = ["-T", "linker.ld"]
+```
+
+Notes:
+
+- Multi-file **ASM** packages emit one `<stem>.bin` per source; **C/C++** emit a single project binary.
+- `objcopy` tools tried in order: `llvm-objcopy`, `objcopy`, `gobjcopy`.
+- Incompatible with `build.qt = true`.
+- `dcr run` rejects `flat-bin` (not a host executable).
--- a/docs/reference/dependencies.mdx
+++ b/docs/reference/dependencies.mdx
@@ -41,24 +41,22 @@ DCR uses a package registry for dependency lookup by name.

 ```toml
 # ~/.dcr/config.toml
-[[registry]]
-name = "default"
+[registry.default]
 url = "https://index.dcr.pm"
+priority = 1
 ```

 Registry priority: order in `config.toml`. The `DCR_INDEX_PATH` variable overrides the path to `index.json`.

 ## Git dependencies

-DCR clones git repositories via `git2`:
+Git dependencies are parsed and recorded in `dcr.lock`. DCR supports specifying branch/tag/rev for git sources:

 - `branch` — switch to a branch
 - `tag` — switch to a tag
 - `rev` — switch to a specific commit
 - `features` — feature flags (parsed, but does not affect build)

-Cache path: `~/.dcr/git/<hash>/`.
-
 ## Path dependencies

 Local paths. DCR automatically discovers include and lib directories from the neighbor's `dcr.toml`.
@@ -69,6 +67,8 @@ mylib = { path = "/abs/path/to/lib" }
 mylib = { path = "../relative/path" }
 ```

+*Note: Header resolution automatically checks the packaged `target/include` directory of path dependencies, ensuring consumer packages can find headers from compiled static or dynamic libraries.*
+
 ## dcr.lock

 Dependency lock file. Contains package names and sources.
--- a/docs/reference/platform-support.mdx
+++ b/docs/reference/platform-support.mdx
@@ -11,17 +11,18 @@ DCR normalizes target triples. Short platform names are expanded to full triples
 ### Linux

 ```
-target/<arch>-unknown-linux-gnu/<profile>/
+target/<arch>-unknown-linux-<env>/<profile>/
 ```

-Architectures: `x86_64`, `aarch64` (host-detected).
+Architectures: `x86_64`, `aarch64`, `i686`, `armv7`, `riscv64` (host-detected).
+Environments: `gnu` (default), `musl`.

 Artifact type: ELF. Extensions: `.so` (sharedlib), `.a` (staticlib).

 ### macOS

 ```
-target/<profile>/
+target/<profile>/ (default) or target/<triple>/<profile>/ (with target)
 ```

 Architectures: `x86_64`, `aarch64` (host-detected).
@@ -31,10 +32,11 @@ Extensions: `.dylib` (sharedlib), `.a` (staticlib).
 ### Windows

 ```
-target/<profile>/
+target/<profile>/ (default) or target/<triple>/<profile>/ (with target)
 ```

 Architectures: `x86_64`, `aarch64`.
+Environments: `msvc` (default), `gnu` (MinGW).

 Extensions: `.exe` (bin), `.lib` (staticlib), `.dll` (sharedlib), `.efi` (UEFI).

--- a/docs/reference/workspaces.mdx
+++ b/docs/reference/workspaces.mdx
@@ -43,7 +43,9 @@ dcr build                    # build all packages in dependency order
 dcr build --workspace app    # build only app (dependencies built automatically)
 ```

-When building a workspace, member outputs (libraries) are automatically added to include/lib paths of dependent packages.
+When building a workspace, DCR automatically injects include and library paths of dependent workspace members:
+- **Include Paths**: Automatically resolves and injects header directories of dependencies, including the member's `src/` directory, local `include/` directory, and the packaged `target/include` directory.
+- **Library Paths**: Injects compiled library search paths (`target/lib` as well as target-specific build folders) to allow automatic linking with member libraries.

 ## Clean

@@ -65,3 +67,21 @@ standard = "c17"

 # member inherits language and standard
 ```
+
+## Workspace-only root (no build of its own)
+
+A workspace root can set `workspace_only = true` — it won't be built itself, and doesn't need `language` or `compiler`:
+
+```toml
+[package]
+name = "my-workspace"
+version = "0.1.0"
+
+[build]
+workspace_only = true
+kind = "bin"
+
+[workspace]
+lib-core = { path = "lib-core" }
+app = { path = "app", deps = ["lib-core"] }
+```
--- a/src/cli/add.rs
+++ b/src/cli/add.rs
@@ -45,7 +45,6 @@ pub fn add(args: &[String]) -> i32 {
        println!("    Adds a dependency to the project.");
        println!();
        printc("SOURCES:", BOLD_GREEN);
-        println!("    user/repo                 GitHub shorthand");
        println!("    github:user/repo          GitHub repository");
        println!("    gitlab:user/repo          GitLab repository");
        println!("    git:host.com/user/repo    Generic git repository");
@@ -140,7 +139,6 @@ fn parse_add_args(args: &[String]) -> Result<AddArgs, i32> {
    if args.is_empty() {
        error("Usage: dcr add <name> <source> [--branch <branch> | --tag <tag> | --rev <rev>]");
        error("Sources:");
-        error("  user/repo                 -> github.com/user/repo");
        error("  github:user/repo          -> github.com/user/repo");
        error("  gitlab:user/repo          -> gitlab.com/user/repo");
        error("  git:host.com/user/repo    -> host.com/user/repo");
--- a/src/cli/build.rs
+++ b/src/cli/build.rs
--- a/src/cli/gen.rs
+++ b/src/cli/gen.rs
@@ -15,10 +15,10 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.

+use crate::core::build::builder::BuildContext;
+use crate::core::build::builder::collect_sources;
+use crate::core::build::common;
 use crate::core::build_config::Config;
-use crate::core::builder::BuildContext;
-use crate::core::builder::collect_sources;
-use crate::core::builder::common;
 use crate::core::workspace::parse_workspace;
 use crate::utils::build::{
    get_bool_with_profile, get_config_opt, get_config_str, get_language_with_profile_or_default,
--- a/src/cli/lint.rs
+++ b/src/cli/lint.rs
@@ -15,8 +15,8 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.

+use crate::core::build::common;
 use crate::core::build_config::Config;
-use crate::core::builder::common;
 use crate::utils::build::{get_bool_with_profile, get_list_with_profile};
 use crate::utils::fs::find_project_root;
 use crate::utils::log::error;
--- a/src/cli/run.rs
+++ b/src/cli/run.rs
@@ -110,8 +110,17 @@ pub fn run(args: &[String]) -> i32 {
        Err(_) => return 1,
    };

-    // Handle workspace-only root: delegate to workspace member
    if config.is_workspace_only() {
+        if let Some(cmd) = get_run_cmd(&config, &flags.profile, flags.target.as_deref(), "") {
+            let build_status = build(&args_for_build(&flags));
+            if build_status == 0 {
+                println!("\n    {} {}", colored("Running", BOLD_GREEN), cmd);
+                println!("--------------------------------");
+                return run_shell(&cmd);
+            }
+            return build_status;
+        }
+
        let ws = match crate::core::workspace::parse_workspace(
            &config,
            &flags.profile,
@@ -213,12 +222,23 @@ fn run_project(

    let kind = build_kind.trim();
    if run_cmd.is_none()
-        && (kind == "staticlib" || kind == "sharedlib" || kind == "efi" || kind == "elf")
+        && (kind == "staticlib"
+            || kind == "sharedlib"
+            || kind == "efi"
+            || kind == "elf"
+            || kind == "flat-bin")
    {
        return Err("Cannot run library build".to_string());
    }

-    let build_status = build(&args_for_build(flags));
+    let build_status = if let Some(wroot) = workspace_root {
+        with_dir(wroot, || {
+            Ok(build(&args_for_workspace_build(flags, project_name)))
+        })
+        .unwrap_or(1)
+    } else {
+        build(&args_for_build(flags))
+    };
    let bin_path = crate::platform::bin_path(
        &flags.profile,
        project_name,
@@ -266,6 +286,36 @@ fn args_for_build(flags: &crate::cli::flags::BuildRunFlags) -> Vec<String> {
        args.push("--workspace".to_string());
        args.push(name.clone());
    }
+    if flags.force {
+        args.push("--force".to_string());
+    }
+    if flags.clean {
+        args.push("--clean".to_string());
+    }
+    if flags.verbose {
+        args.push("--verbose".to_string());
+    }
+    args
+}
+
+fn args_for_workspace_build(
+    flags: &crate::cli::flags::BuildRunFlags,
+    member_name: &str,
+) -> Vec<String> {
+    let mut args = Vec::new();
+    args.push(format!("--{}", flags.profile));
+    if let Some(ref target) = flags.target {
+        args.push("--target".to_string());
+        args.push(target.clone());
+    }
+    args.push("--workspace".to_string());
+    args.push(member_name.to_string());
+    if flags.force {
+        args.push("--force".to_string());
+    }
+    if flags.clean {
+        args.push("--clean".to_string());
+    }
    if flags.verbose {
        args.push("--verbose".to_string());
    }
--- a/src/core/build/archive.rs
+++ b/src/core/build/archive.rs
@@ -0,0 +1,272 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use crate::core::build_config::ArchiveConfig;
+use fatfs::{FileSystem, FormatVolumeOptions, format_volume};
+use glob::glob;
+use std::fs::{self, File, OpenOptions};
+use std::io::{self, Read, Seek, SeekFrom, Write};
+use std::path::Path;
+
+struct OffsetFile<T> {
+    inner: T,
+    offset: u64,
+}
+
+impl<T: Read> Read for OffsetFile<T> {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        self.inner.read(buf)
+    }
+}
+
+impl<T: Write> Write for OffsetFile<T> {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.inner.write(buf)
+    }
+    fn flush(&mut self) -> io::Result<()> {
+        self.inner.flush()
+    }
+}
+
+impl<T: Seek> Seek for OffsetFile<T> {
+    fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
+        match pos {
+            SeekFrom::Start(n) => {
+                let actual = self.inner.seek(SeekFrom::Start(n + self.offset))?;
+                if actual < self.offset {
+                    Ok(0)
+                } else {
+                    Ok(actual - self.offset)
+                }
+            }
+            SeekFrom::Current(n) => {
+                let actual = self.inner.seek(SeekFrom::Current(n))?;
+                if actual < self.offset {
+                    Ok(0)
+                } else {
+                    Ok(actual - self.offset)
+                }
+            }
+            SeekFrom::End(n) => {
+                let actual = self.inner.seek(SeekFrom::End(n))?;
+                if actual < self.offset {
+                    Ok(0)
+                } else {
+                    Ok(actual - self.offset)
+                }
+            }
+        }
+    }
+}
+
+fn parse_size(s: &str) -> Result<u64, String> {
+    let s = s.trim();
+    if s.is_empty() {
+        return Ok(0);
+    }
+    let mut num_str = String::new();
+    let mut unit = String::new();
+    for c in s.chars() {
+        if c.is_ascii_digit() || c == '.' {
+            num_str.push(c);
+        } else {
+            unit.push(c);
+        }
+    }
+    let val: f64 = num_str
+        .parse()
+        .map_err(|_| format!("invalid size number: {num_str}"))?;
+    let unit = unit.trim().to_lowercase();
+    let multiplier = match unit.as_str() {
+        "k" | "kb" => 1024.0,
+        "m" | "mb" => 1024.0 * 1024.0,
+        "g" | "gb" => 1024.0 * 1024.0 * 1024.0,
+        "" => 1.0,
+        _ => return Err(format!("unknown unit: {unit}")),
+    };
+    Ok((val * multiplier) as u64)
+}
+
+pub fn pack_archive(
+    project_root: &Path,
+    config: &ArchiveConfig,
+    profile: &str,
+) -> Result<(), String> {
+    let output_substituted = config.output.replace("{profile}", profile);
+    let output_path = project_root.join(&output_substituted);
+    if let Some(parent) = output_path.parent() {
+        fs::create_dir_all(parent)
+            .map_err(|e| format!("failed to create output parent dir: {e}"))?;
+    }
+
+    let size = if let Some(sz_str) = &config.size {
+        parse_size(sz_str)?
+    } else {
+        1474560
+    };
+
+    let offset = if let Some(off_str) = &config.offset {
+        parse_size(off_str)?
+    } else {
+        0
+    };
+
+    let mut file = OpenOptions::new()
+        .read(true)
+        .write(true)
+        .create(true)
+        .truncate(false)
+        .open(&output_path)
+        .map_err(|e| format!("failed to open output file: {e}"))?;
+
+    let current_len = file.metadata().map(|m| m.len()).unwrap_or(0);
+    if current_len < size {
+        file.set_len(size)
+            .map_err(|e| format!("failed to set image file size: {e}"))?;
+    }
+
+    if offset == 0
+        && let Some(boot_rel) = &config.bootsector
+    {
+        let boot_rel_substituted = boot_rel.replace("{profile}", profile);
+        let boot_path = project_root.join(&boot_rel_substituted);
+        if boot_path.is_file() {
+            let mut boot_file =
+                File::open(&boot_path).map_err(|e| format!("failed to open bootsector: {e}"))?;
+            let mut boot_bytes = vec![0; 512];
+            let _ = boot_file
+                .read(&mut boot_bytes)
+                .map_err(|e| format!("failed to read bootsector: {e}"))?;
+            file.seek(SeekFrom::Start(0))
+                .map_err(|e| format!("failed to seek to start: {e}"))?;
+            file.write_all(&boot_bytes)
+                .map_err(|e| format!("failed to write bootsector: {e}"))?;
+        }
+    }
+
+    file.seek(SeekFrom::Start(0))
+        .map_err(|e| format!("failed to seek to start: {e}"))?;
+
+    let mut wrapper = OffsetFile {
+        inner: file,
+        offset,
+    };
+
+    let label = config.label.as_deref().unwrap_or("VOLUME");
+    let mut label_bytes = [b' '; 11];
+    let bytes_to_copy = label.len().min(11);
+    label_bytes[..bytes_to_copy].copy_from_slice(&label.as_bytes()[..bytes_to_copy]);
+
+    let fat_type = match config.format.to_lowercase().as_str() {
+        "fat12" => Some(fatfs::FatType::Fat12),
+        "fat16" => Some(fatfs::FatType::Fat16),
+        "fat32" => Some(fatfs::FatType::Fat32),
+        _ => None,
+    };
+
+    let mut options = FormatVolumeOptions::new().volume_label(label_bytes);
+    if let Some(t) = fat_type {
+        options = options.fat_type(t);
+    }
+
+    format_volume(&mut wrapper, options)
+        .map_err(|e| format!("failed to format FAT volume: {e}"))?;
+
+    wrapper
+        .seek(SeekFrom::Start(0))
+        .map_err(|e| format!("failed to seek to start after format: {e}"))?;
+
+    let fs = FileSystem::new(wrapper, fatfs::FsOptions::new())
+        .map_err(|e| format!("failed to mount FAT fs: {e}"))?;
+    let root_dir = fs.root_dir();
+
+    for layout in &config.layout {
+        let from_substituted = layout.from.replace("{profile}", profile);
+        let from_pattern = project_root
+            .join(&from_substituted)
+            .to_string_lossy()
+            .to_string();
+
+        let paths = if from_pattern.contains('*') || from_pattern.contains('?') {
+            let mut matched = Vec::new();
+            if let Ok(entries) = glob(&from_pattern) {
+                for path in entries.flatten() {
+                    matched.push(path);
+                }
+            }
+            matched
+        } else {
+            let p = project_root.join(&from_substituted);
+            if p.exists() { vec![p] } else { Vec::new() }
+        };
+
+        for path in paths {
+            if !path.is_file() {
+                continue;
+            }
+            let filename = path.file_name().and_then(|n| n.to_str()).unwrap_or("");
+            if filename.is_empty() {
+                continue;
+            }
+
+            let mut target_filename = filename.to_string();
+            let mut target_dir_str = layout.to.trim_matches('/');
+
+            let is_glob = from_pattern.contains('*') || from_pattern.contains('?');
+            if !is_glob
+                && !layout.to.ends_with('/')
+                && let Some(last_part) = Path::new(&layout.to).file_name().and_then(|n| n.to_str())
+                && last_part.contains('.')
+            {
+                target_filename = last_part.to_string();
+                let parent_path = Path::new(&layout.to).parent().unwrap_or(Path::new(""));
+                target_dir_str = parent_path.to_str().unwrap_or("").trim_matches('/');
+            }
+
+            let mut current_dir = root_dir.clone();
+            if !target_dir_str.is_empty() {
+                let parts = target_dir_str.split('/');
+                for part in parts {
+                    if part.is_empty() {
+                        continue;
+                    }
+                    current_dir = match current_dir.open_dir(part) {
+                        Ok(dir) => dir,
+                        Err(_) => current_dir
+                            .create_dir(part)
+                            .map_err(|e| format!("failed to create dir {part}: {e}"))?,
+                    };
+                }
+            }
+
+            let mut out_file = current_dir
+                .create_file(&target_filename)
+                .map_err(|e| format!("failed to create file {target_filename}: {e}"))?;
+            let mut in_file =
+                File::open(&path).map_err(|e| format!("failed to open input file: {e}"))?;
+            let mut buffer = Vec::new();
+            in_file
+                .read_to_end(&mut buffer)
+                .map_err(|e| format!("failed to read input file: {e}"))?;
+            out_file
+                .write_all(&buffer)
+                .map_err(|e| format!("failed to write to FAT file {target_filename}: {e}"))?;
+        }
+    }
+
+    Ok(())
+}
--- a/src/core/build/builder/artifact.rs
+++ b/src/core/build/builder/artifact.rs
@@ -0,0 +1,251 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use crate::core::build::builder::BuildContext;
+use crate::core::build::common;
+use crate::platform;
+use crate::utils::build::is_bare_metal_target;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+use std::time::Instant;
+
+pub(crate) fn artifact_dir(ctx: &BuildContext) -> PathBuf {
+    match ctx.target_dir {
+        Some(dir) => Path::new(dir).to_path_buf(),
+        None => Path::new("./target").join(ctx.profile),
+    }
+}
+
+pub(crate) fn flat_output_path(ctx: &BuildContext) -> String {
+    let name = ctx.output_filename.unwrap_or(ctx.project_name);
+    let ext = ctx.output_extension.unwrap_or("bin");
+    let file = if ext.is_empty() {
+        name.to_string()
+    } else {
+        format!("{name}.{ext}")
+    };
+    artifact_dir(ctx).join(file).to_string_lossy().to_string()
+}
+
+pub(crate) fn flat_source_output_path(ctx: &BuildContext, source: &str) -> String {
+    let stem = Path::new(source)
+        .file_stem()
+        .and_then(|s| s.to_str())
+        .unwrap_or("out");
+    let ext = ctx.output_extension.unwrap_or("bin");
+    let file = if ext.is_empty() {
+        stem.to_string()
+    } else {
+        format!("{stem}.{ext}")
+    };
+    artifact_dir(ctx).join(file).to_string_lossy().to_string()
+}
+
+fn resolve_objcopy() -> Result<String, String> {
+    for candidate in ["llvm-objcopy", "objcopy", "gobjcopy"] {
+        if Command::new(candidate)
+            .arg("--version")
+            .output()
+            .map(|o| o.status.success())
+            .unwrap_or(false)
+        {
+            return Ok(candidate.to_string());
+        }
+    }
+    Err(
+        "flat-bin requires llvm-objcopy, objcopy, or gobjcopy in PATH \
+         (install binutils or LLVM tools)"
+            .to_string(),
+    )
+}
+
+pub(crate) fn objcopy_binary(ctx: &BuildContext, input: &str, output: &str) -> Result<(), String> {
+    if let Some(parent) = Path::new(output).parent() {
+        std::fs::create_dir_all(parent).map_err(|e| format!("output dir error: {e}"))?;
+    }
+    if !common::needs_rebuild(input, output) {
+        return Ok(());
+    }
+    let tool = resolve_objcopy()?;
+    let mut cmd = Command::new(&tool);
+    cmd.arg("-O").arg("binary").arg(input).arg(output);
+    if ctx.verbose || std::env::var("DCR_DEBUG").is_ok() {
+        eprintln!("[dcr] {:?}", cmd);
+    }
+    common::run_command_sync_output(&mut cmd)
+}
+
+pub(crate) fn link_flat_binary(
+    ctx: &BuildContext,
+    objects: &[String],
+    default_linker: &str,
+    start_time: Instant,
+) -> Result<f64, String> {
+    let out_path = flat_output_path(ctx);
+    if !common::needs_link(objects, &out_path) {
+        return Ok(common::elapsed_secs(start_time));
+    }
+
+    let intermediate = {
+        let dir = match ctx.target_dir {
+            Some(dir) => Path::new(dir).join("obj"),
+            None => Path::new("./target").join(ctx.profile).join("obj"),
+        };
+        std::fs::create_dir_all(&dir).map_err(|e| format!("obj dir error: {e}"))?;
+        dir.join(format!("{}.flat.elf", ctx.project_name))
+            .to_string_lossy()
+            .to_string()
+    };
+
+    let mut cmd = Command::new(ctx.linker.unwrap_or(default_linker));
+    cmd.arg("-nostdlib").arg("-static");
+    for obj in objects {
+        cmd.arg(obj);
+    }
+    for dir in ctx.lib_dirs {
+        cmd.arg(format!("-L{dir}"));
+    }
+    for lib in ctx.libs {
+        cmd.arg(format!("-l{lib}"));
+    }
+    for flag in ctx.ldflags {
+        cmd.arg(flag);
+    }
+    cmd.arg("-o").arg(&intermediate);
+
+    if ctx.verbose || std::env::var("DCR_DEBUG").is_ok() {
+        eprintln!("[dcr] {:?}", cmd);
+    }
+    let output = cmd.output().map_err(|err| format!("Build failed: {err}"))?;
+    if !output.status.success() {
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        let stdout = String::from_utf8_lossy(&output.stdout);
+        return Err(format!(
+            "flat-bin link failed:\nstdout: {stdout}\nstderr: {stderr}"
+        ));
+    }
+
+    objcopy_binary(ctx, &intermediate, &out_path)?;
+    Ok(common::elapsed_secs(start_time))
+}
+
+pub(crate) fn archive_static(
+    ctx: &BuildContext,
+    objects: &[String],
+    start_time: Instant,
+) -> Result<f64, String> {
+    let lib_path = platform::lib_path(ctx.profile, ctx.project_name, ctx.target_dir);
+    if !common::needs_link(objects, &lib_path) {
+        return Ok(common::elapsed_secs(start_time));
+    }
+
+    let archiver = ctx.archiver.unwrap_or(if cfg!(target_os = "windows") {
+        "lib"
+    } else {
+        "ar"
+    });
+
+    let mut cmd = Command::new(archiver);
+    if cfg!(target_os = "windows") && archiver == "lib" {
+        cmd.arg("/nologo").arg(format!("/OUT:{lib_path}"));
+    } else {
+        cmd.arg("rcs").arg(&lib_path);
+    }
+    for obj in objects {
+        cmd.arg(obj);
+    }
+    run(ctx, cmd, start_time)
+}
+
+pub(crate) fn link_binary(
+    ctx: &BuildContext,
+    objects: &[String],
+    default_linker: &str,
+    start_time: Instant,
+) -> Result<f64, String> {
+    if crate::utils::build::is_flat_bin(ctx.kind) {
+        return link_flat_binary(ctx, objects, default_linker, start_time);
+    }
+
+    let mut cmd = Command::new(ctx.linker.unwrap_or(default_linker));
+    if ctx.kind == "sharedlib" {
+        if cfg!(target_os = "macos") {
+            cmd.arg("-dynamiclib");
+        } else {
+            cmd.arg("-shared");
+        }
+    }
+    if ctx.kind == "efi" {
+        cmd.arg("-shared");
+        cmd.arg("-nostdlib");
+        cmd.arg("-Wl,-dll");
+        cmd.arg("-Wl,--subsystem,10");
+    } else if ctx.freestanding || is_bare_metal_target(ctx.target) {
+        cmd.arg("-nostdlib");
+        cmd.arg("-static");
+    }
+    for obj in objects {
+        cmd.arg(obj);
+    }
+    for dir in ctx.lib_dirs {
+        cmd.arg(format!("-L{dir}"));
+    }
+    for lib in ctx.libs {
+        cmd.arg(format!("-l{lib}"));
+    }
+    for flag in ctx.ldflags {
+        cmd.arg(flag);
+    }
+
+    let name = ctx.output_filename.unwrap_or(ctx.project_name);
+    let ext = ctx.output_extension.unwrap_or("");
+    let final_name = if ext.is_empty() {
+        name.to_string()
+    } else {
+        format!("{}.{}", name, ext)
+    };
+
+    let out_path = if ctx.kind == "sharedlib" {
+        platform::shared_lib_path(ctx.profile, &final_name, ctx.target_dir)
+    } else if ctx.kind == "efi" {
+        platform::efi_path(ctx.profile, &final_name, ctx.target_dir)
+    } else if ctx.kind == "elf" {
+        platform::elf_path(ctx.profile, &final_name, ctx.target_dir)
+    } else {
+        platform::bin_path(ctx.profile, &final_name, ctx.target_dir)
+    };
+
+    if !common::needs_link(objects, &out_path) {
+        return Ok(common::elapsed_secs(start_time));
+    }
+    cmd.arg("-o").arg(out_path);
+    run(ctx, cmd, start_time)
+}
+
+fn run(ctx: &BuildContext, mut cmd: Command, start_time: Instant) -> Result<f64, String> {
+    if ctx.verbose || std::env::var("DCR_DEBUG").is_ok() {
+        eprintln!("[dcr] {:?}", cmd);
+    }
+    let output = cmd.output().map_err(|err| format!("Build failed: {err}"))?;
+    if output.status.success() {
+        Ok(common::elapsed_secs(start_time))
+    } else {
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        let stdout = String::from_utf8_lossy(&output.stdout);
+        Err(format!("Build failed:\nstdout: {stdout}\nstderr: {stderr}"))
+    }
+}
--- a/src/core/build/builder/cc_common.rs
+++ b/src/core/build/builder/cc_common.rs
@@ -15,10 +15,10 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.

-use crate::core::builder::BuildContext;
-use crate::core::builder::common;
-use crate::platform;
-use crate::utils::build::is_bare_metal_target;
+use crate::core::build::builder::BuildContext;
+use crate::core::build::builder::artifact;
+use crate::core::build::common;
+use crate::utils::build::{is_bare_metal_target, is_compile_only, is_flat_bin};
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::Command;
@@ -30,13 +30,16 @@ pub fn build(ctx: &BuildContext) -> Result<f64, String> {
    } else {
        ctx.compiler
    };
+    if is_flat_bin(ctx.kind) && ctx.qt {
+        return Err("flat-bin is not supported with build.qt = true".to_string());
+    }
    let start_time = Instant::now();
    let obj_dir = match ctx.target_dir {
        Some(dir) => Path::new(dir).join("obj"),
        None => Path::new("./target").join(ctx.profile).join("obj"),
    };
    let qt_include_path = if ctx.qt {
-        crate::core::builder::qt::process_qt(ctx, &obj_dir)?
+        crate::core::build::language::cxx::qt::process_qt(ctx, &obj_dir)?
    } else {
        None
    };
@@ -55,94 +58,15 @@ pub fn build(ctx: &BuildContext) -> Result<f64, String> {
    )?;
    let objects = build_objects(compiler, &sources, &obj_dir, ctx, "o", qt_include_path)?;

+    if is_compile_only(ctx.kind) && !is_flat_bin(ctx.kind) {
+        return Ok(common::elapsed_secs(start_time));
+    }
+
    if ctx.kind == "staticlib" {
-        let lib_path = platform::lib_path(ctx.profile, ctx.project_name, ctx.target_dir);
-        if !common::needs_link(&objects, &lib_path) {
-            let elapsed = common::elapsed_secs(start_time);
-            return Ok(elapsed);
-        }
-        let mut cmd = Command::new(ctx.archiver.unwrap_or("ar"));
-        cmd.arg("rcs").arg(&lib_path);
-        for obj in &objects {
-            cmd.arg(obj);
-        }
-        if ctx.verbose || std::env::var("DCR_DEBUG").is_ok() {
-            eprintln!("[dcr] {:?}", cmd);
-        }
-        match cmd.status() {
-            Ok(status) if status.success() => {
-                let elapsed = common::elapsed_secs(start_time);
-                return Ok(elapsed);
-            }
-            Ok(_) => return Err("Build failed".to_string()),
-            Err(err) => return Err(format!("Build failed: {err}")),
-        }
+        return artifact::archive_static(ctx, &objects, start_time);
    }

-    let mut cmd = Command::new(ctx.linker.unwrap_or(compiler));
-    if ctx.kind == "sharedlib" {
-        if cfg!(target_os = "macos") {
-            cmd.arg("-dynamiclib");
-        } else {
-            cmd.arg("-shared");
-        }
-    }
-    if ctx.kind == "efi" {
-        cmd.arg("-shared");
-        cmd.arg("-nostdlib");
-        cmd.arg("-Wl,-dll");
-        cmd.arg("-Wl,--subsystem,10");
-    } else if ctx.freestanding || is_bare_metal_target(ctx.target) {
-        cmd.arg("-nostdlib");
-        cmd.arg("-static");
-    }
-    for obj in &objects {
-        cmd.arg(obj);
-    }
-    for dir in ctx.lib_dirs {
-        cmd.arg(format!("-L{dir}"));
-    }
-    for lib in ctx.libs {
-        cmd.arg(format!("-l{lib}"));
-    }
-    for flag in ctx.ldflags {
-        cmd.arg(flag);
-    }
-    let name = ctx.output_filename.unwrap_or(ctx.project_name);
-    let ext = ctx.output_extension.unwrap_or("");
-    let final_name = if ext.is_empty() {
-        name.to_string()
-    } else {
-        format!("{}.{}", name, ext)
-    };
-
-    let out_path = if ctx.kind == "sharedlib" {
-        platform::shared_lib_path(ctx.profile, &final_name, ctx.target_dir)
-    } else if ctx.kind == "efi" {
-        platform::efi_path(ctx.profile, &final_name, ctx.target_dir)
-    } else if ctx.kind == "elf" {
-        platform::elf_path(ctx.profile, &final_name, ctx.target_dir)
-    } else {
-        platform::bin_path(ctx.profile, &final_name, ctx.target_dir)
-    };
-
-    if !common::needs_link(&objects, &out_path) {
-        let elapsed = common::elapsed_secs(start_time);
-        return Ok(elapsed);
-    }
-    cmd.arg("-o").arg(out_path);
-
-    if ctx.verbose || std::env::var("DCR_DEBUG").is_ok() {
-        eprintln!("[dcr] {:?}", cmd);
-    }
-    match cmd.status() {
-        Ok(status) if status.success() => {
-            let elapsed = common::elapsed_secs(start_time);
-            Ok(elapsed)
-        }
-        Ok(_) => Err("Build failed".to_string()),
-        Err(err) => Err(format!("Build failed: {err}")),
-    }
+    artifact::link_binary(ctx, &objects, compiler, start_time)
 }

 pub(crate) fn collect_sources(ctx: &BuildContext) -> Result<Vec<String>, String> {
@@ -156,7 +80,7 @@ pub(crate) fn collect_sources(ctx: &BuildContext) -> Result<Vec<String>, String>
 }

 fn source_extensions(language: &str) -> Vec<&'static str> {
-    crate::core::builder::common::source_extensions(language)
+    crate::core::build::common::source_extensions(language)
 }

 fn default_flags(profile: &str) -> &'static [&'static str] {
@@ -221,7 +145,7 @@ fn build_object(
        cmd.arg("-fPIC");
    }

-    if (ctx.freestanding || is_bare_metal_target(ctx.target))
+    if (ctx.freestanding || is_bare_metal_target(ctx.target) || is_flat_bin(ctx.kind))
        && ctx.language.to_lowercase() != "asm"
    {
        cmd.arg("-ffreestanding");
@@ -257,8 +181,8 @@ fn build_object(
        }
    }

-    let use_dcr_defaults =
-        ctx.cflags.is_empty() && !(ctx.freestanding || is_bare_metal_target(ctx.target));
+    let use_dcr_defaults = ctx.cflags.is_empty()
+        && !(ctx.freestanding || is_bare_metal_target(ctx.target) || is_flat_bin(ctx.kind));
    if use_dcr_defaults {
        for flag in default_flags(ctx.profile) {
            cmd.arg(flag);
@@ -288,5 +212,5 @@ fn build_object(
 }

 fn asm_lang_flag(source: &str) -> Option<&'static str> {
-    crate::core::builder::common::asm_lang_flag(source)
+    crate::core::build::common::asm_lang_flag(source)
 }
--- a/src/core/build/builder/mod.rs
+++ b/src/core/build/builder/mod.rs
@@ -0,0 +1,234 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+pub mod artifact;
+pub mod cc_common;
+pub mod msvc;
+
+use crate::core::build::language::asm::{fasm, gas, masm, nasm};
+use crate::core::build::language::llvm_ir;
+
+pub struct BuildContext<'a> {
+    pub profile: &'a str,
+    pub project_name: &'a str,
+    pub compiler: &'a str,
+    pub language: &'a str,
+    pub standard: &'a str,
+    pub cxx_standard: &'a str,
+    pub target: Option<&'a str>,
+    pub target_dir: Option<&'a str>,
+    pub kind: &'a str,
+    pub platform: Option<&'a str>,
+    pub linker: Option<&'a str>,
+    pub archiver: Option<&'a str>,
+    pub moc: Option<&'a str>,
+    pub uic: Option<&'a str>,
+    pub rcc: Option<&'a str>,
+    pub package_type: Option<&'a str>,
+    pub freestanding: bool,
+    pub panic_abort: bool,
+    pub codegen_units: usize,
+    pub source_roots: &'a [std::path::PathBuf],
+    pub exclude_dirs: &'a [std::path::PathBuf],
+    pub include_paths: &'a [String],
+    pub include_dirs: &'a [String],
+    pub lib_dirs: &'a [String],
+    pub libs: &'a [String],
+    pub cflags: &'a [String],
+    pub ldflags: &'a [String],
+    pub output_filename: Option<&'a str>,
+    pub output_extension: Option<&'a str>,
+    pub verbose: bool,
+    pub qt: bool,
+}
+
+pub trait Builder {
+    #[allow(dead_code)]
+    fn id(&self) -> &'static str;
+    fn build(&self, ctx: &BuildContext) -> Result<f64, String>;
+    fn collect_sources(&self, ctx: &BuildContext) -> Result<Vec<String>, String>;
+}
+
+struct Cc;
+struct Msvc;
+struct Nasm;
+struct Gas;
+struct Masm;
+struct Fasm;
+struct Llc;
+
+impl Builder for Cc {
+    fn id(&self) -> &'static str {
+        "cc"
+    }
+    fn build(&self, ctx: &BuildContext) -> Result<f64, String> {
+        cc_common::build(ctx)
+    }
+    fn collect_sources(&self, ctx: &BuildContext) -> Result<Vec<String>, String> {
+        cc_common::collect_sources(ctx)
+    }
+}
+
+impl Builder for Msvc {
+    fn id(&self) -> &'static str {
+        "msvc"
+    }
+    fn build(&self, ctx: &BuildContext) -> Result<f64, String> {
+        msvc::build(ctx)
+    }
+    fn collect_sources(&self, ctx: &BuildContext) -> Result<Vec<String>, String> {
+        msvc::collect_sources(ctx)
+    }
+}
+
+impl Builder for Nasm {
+    fn id(&self) -> &'static str {
+        "nasm"
+    }
+    fn build(&self, ctx: &BuildContext) -> Result<f64, String> {
+        nasm::build(ctx)
+    }
+    fn collect_sources(&self, ctx: &BuildContext) -> Result<Vec<String>, String> {
+        nasm::collect_sources(ctx)
+    }
+}
+
+impl Builder for Gas {
+    fn id(&self) -> &'static str {
+        "gas"
+    }
+    fn build(&self, ctx: &BuildContext) -> Result<f64, String> {
+        gas::build(ctx)
+    }
+    fn collect_sources(&self, ctx: &BuildContext) -> Result<Vec<String>, String> {
+        gas::collect_sources(ctx)
+    }
+}
+
+impl Builder for Masm {
+    fn id(&self) -> &'static str {
+        "masm"
+    }
+    fn build(&self, ctx: &BuildContext) -> Result<f64, String> {
+        masm::build(ctx)
+    }
+    fn collect_sources(&self, ctx: &BuildContext) -> Result<Vec<String>, String> {
+        masm::collect_sources(ctx)
+    }
+}
+
+impl Builder for Fasm {
+    fn id(&self) -> &'static str {
+        "fasm"
+    }
+    fn build(&self, ctx: &BuildContext) -> Result<f64, String> {
+        fasm::build(ctx)
+    }
+    fn collect_sources(&self, ctx: &BuildContext) -> Result<Vec<String>, String> {
+        fasm::collect_sources(ctx)
+    }
+}
+
+impl Builder for Llc {
+    fn id(&self) -> &'static str {
+        "llvm_ir"
+    }
+    fn build(&self, ctx: &BuildContext) -> Result<f64, String> {
+        llvm_ir::build(ctx)
+    }
+    fn collect_sources(&self, ctx: &BuildContext) -> Result<Vec<String>, String> {
+        llvm_ir::collect_sources(ctx)
+    }
+}
+
+pub fn builder_for(compiler: &str) -> &'static dyn Builder {
+    let c = compiler.to_lowercase();
+    if c.contains("clang-cl") {
+        return &Msvc;
+    }
+    if c == "as" || c.contains("gas") {
+        return &Gas;
+    }
+    if c.contains("llc") {
+        return &Llc;
+    }
+    if c.contains("fasm") {
+        return &Fasm;
+    }
+    if c.contains("nasm") {
+        return &Nasm;
+    }
+    if c == "ml" || c == "ml64" || c.contains("masm") {
+        return &Masm;
+    }
+    if c == "cl" || c.contains("msvc") {
+        return &Msvc;
+    }
+    &Cc
+}
+
+pub fn build(ctx: &BuildContext) -> Result<f64, String> {
+    if !check_compiler_exists(ctx.compiler) {
+        return Err(format!(
+            "Compiler not found: {}. Make sure it is installed and available in PATH.",
+            ctx.compiler
+        ));
+    }
+    builder_for(ctx.compiler).build(ctx)
+}
+
+fn check_compiler_exists(compiler: &str) -> bool {
+    let name = if compiler.is_empty() {
+        "cc"
+    } else {
+        match compiler.to_lowercase().as_str() {
+            "gas" | "gnu-as" => "as",
+            "nasm" => "nasm",
+            "fasm" | "fasm64" => "fasm",
+            "masm" | "ml" | "ml64" => "ml",
+            _ => compiler,
+        }
+    };
+    std::process::Command::new(name)
+        .arg("--version")
+        .output()
+        .is_ok()
+}
+
+pub fn collect_sources(ctx: &BuildContext) -> Result<Vec<String>, String> {
+    builder_for(ctx.compiler).collect_sources(ctx)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn builder_resolves_by_compiler_name() {
+        assert_eq!(builder_for("gcc").id(), "cc");
+        assert_eq!(builder_for("clang").id(), "cc");
+        assert_eq!(builder_for("clang++").id(), "cc");
+        assert_eq!(builder_for("").id(), "cc");
+        assert_eq!(builder_for("nasm").id(), "nasm");
+        assert_eq!(builder_for("as").id(), "gas");
+        assert_eq!(builder_for("llc-18").id(), "llvm_ir");
+        assert_eq!(builder_for("fasm").id(), "fasm");
+        assert_eq!(builder_for("ml64").id(), "masm");
+        assert_eq!(builder_for("cl").id(), "msvc");
+        assert_eq!(builder_for("clang-cl").id(), "msvc");
+    }
+}
--- a/src/core/build/builder/msvc/mod.rs
+++ b/src/core/build/builder/msvc/mod.rs
@@ -15,9 +15,11 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.

-use crate::core::builder::BuildContext;
-use crate::core::builder::common;
+use crate::core::build::builder::BuildContext;
+use crate::core::build::builder::artifact;
+use crate::core::build::common;
 use crate::platform;
+use crate::utils::build::{is_compile_only, is_flat_bin};
 use std::fs;
 use std::path::Path;
 use std::process::Command;
@@ -33,6 +35,9 @@ pub fn build(ctx: &BuildContext) -> Result<f64, String> {
    if lang.contains("asm") {
        return Err("MSVC backend does not support build.language with asm".to_string());
    }
+    if is_flat_bin(ctx.kind) && ctx.qt {
+        return Err("flat-bin is not supported with build.qt = true".to_string());
+    }
    let start_time = Instant::now();
    let sources = collect_sources(ctx)?;
    let obj_dir = match ctx.target_dir {
@@ -41,6 +46,14 @@ pub fn build(ctx: &BuildContext) -> Result<f64, String> {
    };
    let objects = build_objects(compiler, &sources, &obj_dir, ctx, "obj")?;

+    if is_compile_only(ctx.kind) && !is_flat_bin(ctx.kind) {
+        return Ok(common::elapsed_secs(start_time));
+    }
+
+    if is_flat_bin(ctx.kind) {
+        return link_flat_msvc(ctx, compiler, &objects, &obj_dir, start_time);
+    }
+
    if ctx.kind == "staticlib" {
        let lib_path = platform::lib_path(ctx.profile, ctx.project_name, ctx.target_dir);
        if !common::needs_link(&objects, &lib_path) {
@@ -141,6 +154,61 @@ pub fn build(ctx: &BuildContext) -> Result<f64, String> {
    }
 }

+fn link_flat_msvc(
+    ctx: &BuildContext,
+    compiler: &str,
+    objects: &[String],
+    obj_dir: &Path,
+    start_time: Instant,
+) -> Result<f64, String> {
+    let out_path = artifact::flat_output_path(ctx);
+    if !common::needs_link(objects, &out_path) {
+        return Ok(common::elapsed_secs(start_time));
+    }
+    fs::create_dir_all(obj_dir).map_err(|e| format!("obj dir error: {e}"))?;
+    let intermediate = obj_dir
+        .join(format!("{}.flat.exe", ctx.project_name))
+        .to_string_lossy()
+        .to_string();
+
+    let mut cmd = Command::new(compiler);
+    cmd.arg("/nologo");
+    for obj in objects {
+        cmd.arg(obj);
+    }
+    for flag in ctx.cflags {
+        cmd.arg(flag);
+    }
+    for dir in ctx.lib_dirs {
+        cmd.arg(format!("/LIBPATH:{dir}"));
+    }
+    for lib in ctx.libs {
+        if lib.to_lowercase().ends_with(".lib") {
+            cmd.arg(lib);
+        } else {
+            cmd.arg(format!("{lib}.lib"));
+        }
+    }
+    cmd.arg(format!("/Fe:{intermediate}"));
+    if !ctx.ldflags.is_empty() {
+        cmd.arg("/link");
+        for flag in ctx.ldflags {
+            cmd.arg(flag);
+        }
+    }
+    if ctx.verbose || std::env::var("DCR_DEBUG").is_ok() {
+        eprintln!("[dcr] {:?}", cmd);
+    }
+    let status = cmd
+        .status()
+        .map_err(|e| format!("flat-bin link failed: {e}"))?;
+    if !status.success() {
+        return Err("flat-bin link failed".to_string());
+    }
+    artifact::objcopy_binary(ctx, &intermediate, &out_path)?;
+    Ok(common::elapsed_secs(start_time))
+}
+
 pub(crate) fn collect_sources(ctx: &BuildContext) -> Result<Vec<String>, String> {
    let extensions = source_extensions(ctx.language);
    common::collect_sources(
@@ -152,7 +220,7 @@ pub(crate) fn collect_sources(ctx: &BuildContext) -> Result<Vec<String>, String>
 }

 fn source_extensions(language: &str) -> Vec<&'static str> {
-    crate::core::builder::common::source_extensions(language)
+    crate::core::build::common::source_extensions(language)
 }

 fn msvc_standard_flag(language: &str, standard: &str) -> Result<String, String> {
--- a/src/core/build/cache.rs
+++ b/src/core/build/cache.rs
@@ -0,0 +1,264 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use crate::core::build::builder::BuildContext;
+use crate::core::build::common;
+use sha2::{Digest, Sha256};
+use std::fs;
+use std::path::{Path, PathBuf};
+
+pub(crate) fn compute_build_fingerprint(
+    ctx: &BuildContext,
+    sources: &[String],
+    headers: &[PathBuf],
+    lib_files: &[PathBuf],
+) -> Result<String, String> {
+    let mut hasher = Sha256::new();
+    hasher.update(ctx.profile.as_bytes());
+    hasher.update(ctx.project_name.as_bytes());
+    hasher.update(ctx.compiler.as_bytes());
+    hasher.update(ctx.language.as_bytes());
+    hasher.update(ctx.standard.as_bytes());
+    hasher.update(ctx.kind.as_bytes());
+    if let Some(v) = ctx.target_dir {
+        hasher.update(v.as_bytes());
+    }
+    if let Some(v) = ctx.platform {
+        hasher.update(v.as_bytes());
+    }
+    if let Some(v) = ctx.linker {
+        hasher.update(v.as_bytes());
+    }
+    if let Some(v) = ctx.archiver {
+        hasher.update(v.as_bytes());
+    }
+    for value in ctx.include_dirs {
+        hasher.update(value.as_bytes());
+    }
+    for value in ctx.lib_dirs {
+        hasher.update(value.as_bytes());
+    }
+    for value in ctx.libs {
+        hasher.update(value.as_bytes());
+    }
+    for value in ctx.cflags {
+        hasher.update(value.as_bytes());
+    }
+    for value in ctx.ldflags {
+        hasher.update(value.as_bytes());
+    }
+    let toml =
+        fs::read_to_string("dcr.toml").map_err(|err| format!("Failed to read dcr.toml: {err}"))?;
+    hasher.update(toml.as_bytes());
+    if let Ok(lock) = fs::read_to_string("dcr.lock") {
+        hasher.update(lock.as_bytes());
+    }
+    for source in sources {
+        let path = Path::new(source);
+        update_hasher_with_file(&mut hasher, path)?;
+    }
+    for header in headers {
+        update_hasher_with_file(&mut hasher, header)?;
+    }
+    for lib in lib_files {
+        update_hasher_with_file(&mut hasher, lib)?;
+    }
+    Ok(to_hex(&hasher.finalize()))
+}
+
+pub(crate) fn should_skip_build(ctx: &BuildContext, fingerprint: &str) -> bool {
+    let output = build_output_path(ctx);
+    if !Path::new(&output).is_file() {
+        return false;
+    }
+    let cache_path = build_cache_path(ctx.profile, ctx.target_dir);
+    let cached = fs::read_to_string(cache_path).unwrap_or_default();
+    cached.trim() == fingerprint
+}
+
+pub(crate) fn write_build_fingerprint(ctx: &BuildContext, fingerprint: &str) -> Result<(), String> {
+    let cache_path = build_cache_path(ctx.profile, ctx.target_dir);
+    if let Some(parent) = cache_path.parent() {
+        fs::create_dir_all(parent).map_err(|err| format!("Failed to create cache dir: {err}"))?;
+    }
+    fs::write(cache_path, format!("{fingerprint}\n"))
+        .map_err(|err| format!("Failed to write cache: {err}"))
+}
+
+fn build_cache_path(profile: &str, target_dir: Option<&str>) -> PathBuf {
+    match target_dir {
+        Some(dir) => Path::new(dir).join(".dcr-build.hash"),
+        None => Path::new("./target").join(profile).join(".dcr-build.hash"),
+    }
+}
+
+fn build_output_path(ctx: &BuildContext) -> String {
+    if crate::utils::build::is_flat_bin(ctx.kind) {
+        return crate::core::build::builder::artifact::flat_output_path(ctx);
+    }
+
+    let name = ctx.output_filename.unwrap_or(ctx.project_name);
+    let ext = ctx.output_extension.unwrap_or("");
+
+    let final_name = if ext.is_empty() {
+        name.to_string()
+    } else {
+        format!("{}.{}", name, ext)
+    };
+
+    if ctx.kind == "staticlib" {
+        return crate::platform::lib_path(ctx.profile, &final_name, ctx.target_dir);
+    }
+    if ctx.kind == "sharedlib" {
+        return crate::platform::shared_lib_path(ctx.profile, &final_name, ctx.target_dir);
+    }
+    if ctx.kind == "efi" {
+        return crate::platform::efi_path(ctx.profile, &final_name, ctx.target_dir);
+    }
+    if ctx.kind == "elf" {
+        return crate::platform::elf_path(ctx.profile, &final_name, ctx.target_dir);
+    }
+    crate::platform::bin_path(ctx.profile, &final_name, ctx.target_dir)
+}
+
+pub(crate) fn collect_header_files(
+    ctx: &BuildContext,
+    project_root: &Path,
+) -> Result<Vec<PathBuf>, String> {
+    let mut out = Vec::new();
+    let mut roots = Vec::new();
+    if ctx.source_roots.is_empty() {
+        roots.push(project_root.join("src"));
+    } else {
+        roots.extend(ctx.source_roots.iter().cloned());
+    }
+    let abs_root = project_root
+        .canonicalize()
+        .unwrap_or_else(|_| project_root.to_path_buf());
+    for dir in ctx.include_dirs {
+        let p = Path::new(dir).to_path_buf();
+        if let Ok(abs_p) = p.canonicalize() {
+            if abs_p.starts_with(&abs_root) {
+                roots.push(abs_p);
+            }
+        } else if p.starts_with(&abs_root) {
+            roots.push(p);
+        }
+    }
+    for root in roots {
+        if !root.exists() {
+            continue;
+        }
+        if root.is_file() {
+            if is_header_file(&root) {
+                out.push(root);
+            }
+        } else {
+            collect_header_files_rec(&root, &mut out, ctx.exclude_dirs, ctx.include_paths)?;
+        }
+    }
+    out.sort();
+    out.dedup();
+    Ok(out)
+}
+
+fn collect_header_files_rec(
+    dir: &Path,
+    out: &mut Vec<PathBuf>,
+    exclude_dirs: &[PathBuf],
+    include_paths: &[String],
+) -> Result<(), String> {
+    if common::is_excluded(dir, exclude_dirs, include_paths) && include_paths.is_empty() {
+        return Ok(());
+    }
+    for entry in fs::read_dir(dir).map_err(|err| format!("read_dir error: {err}"))? {
+        let entry = entry.map_err(|err| format!("read_dir error: {err}"))?;
+        let path = entry.path();
+        if path.is_dir() {
+            if common::is_excluded(&path, exclude_dirs, include_paths) && include_paths.is_empty() {
+                continue;
+            }
+            collect_header_files_rec(&path, out, exclude_dirs, include_paths)?;
+            continue;
+        }
+        if !path.is_file() {
+            continue;
+        }
+        if common::is_excluded(&path, exclude_dirs, include_paths) {
+            continue;
+        }
+        if is_header_file(&path) {
+            out.push(path);
+        }
+    }
+    Ok(())
+}
+
+fn is_header_file(path: &Path) -> bool {
+    let ext = path.extension().and_then(|v| v.to_str()).unwrap_or("");
+    matches!(ext, "h" | "hpp" | "hh" | "hxx" | "inc")
+}
+
+pub(crate) fn collect_lib_files(ctx: &BuildContext) -> Vec<PathBuf> {
+    let mut out = Vec::new();
+    for dir in ctx.lib_dirs {
+        let dir_path = Path::new(dir);
+        for lib in ctx.libs {
+            for candidate in lib_candidates(lib) {
+                let path = dir_path.join(candidate);
+                if path.is_file() {
+                    out.push(path);
+                }
+            }
+        }
+    }
+    out
+}
+
+fn lib_candidates(name: &str) -> Vec<String> {
+    if cfg!(target_os = "windows") {
+        return vec![format!("{name}.lib")];
+    }
+    if cfg!(target_os = "macos") {
+        return vec![
+            format!("lib{name}.a"),
+            format!("lib{name}.dylib"),
+            format!("lib{name}.so"),
+        ];
+    }
+    vec![
+        format!("lib{name}.a"),
+        format!("lib{name}.so"),
+        format!("lib{name}.so.0"),
+    ]
+}
+
+fn update_hasher_with_file(hasher: &mut Sha256, path: &Path) -> Result<(), String> {
+    hasher.update(path.to_string_lossy().as_bytes());
+    let meta = fs::metadata(path).map_err(|err| format!("source read error: {err}"))?;
+    hasher.update(meta.len().to_le_bytes());
+    if let Ok(modified) = meta.modified()
+        && let Ok(duration) = modified.duration_since(std::time::UNIX_EPOCH)
+    {
+        hasher.update(duration.as_nanos().to_le_bytes());
+    }
+    Ok(())
+}
+
+fn to_hex(bytes: &[u8]) -> String {
+    crate::utils::fs::to_hex(bytes)
+}
--- a/src/core/builder/common.rs
+++ b/src/core/builder/common.rs
@@ -35,8 +35,16 @@ pub fn collect_sources(
 ) -> Result<Vec<String>, String> {
    let mut sources = Vec::new();
    for root in roots {
+        if root.is_file() {
+            if let Some(ext) = root.extension().and_then(|e| e.to_str())
+                && extensions.contains(&ext.to_lowercase().as_str())
+            {
+                sources.push(root.to_string_lossy().to_string());
+            }
+        } else {
            collect_sources_rec(root, extensions, &mut sources, exclude_dirs, include_paths)?;
        }
+    }
    sources.sort();
    Ok(sources)
 }
@@ -58,9 +66,10 @@ fn collect_sources_rec(
    if is_excluded(&full_dir, exclude_dirs, include_paths) && include_paths.is_empty() {
        return Ok(());
    }
-    let entries = fs::read_dir(&full_dir).map_err(|err| format!("src dir error: {err}"))?;
+    let entries = fs::read_dir(&full_dir)
+        .map_err(|err| format!("src dir error for {:?}: {err}", full_dir))?;
    for entry in entries {
-        let entry = entry.map_err(|err| format!("src dir error: {err}"))?;
+        let entry = entry.map_err(|err| format!("src dir error for {:?}: {err}", full_dir))?;
        let path = entry.path();
        if path.is_dir() {
            if is_excluded(&path, exclude_dirs, include_paths) && include_paths.is_empty() {
@@ -177,12 +186,8 @@ pub fn asm_lang_flag(source: &str) -> Option<&'static str> {
 pub fn source_extensions(language: &str) -> Vec<&'static str> {
    let mut out = Vec::new();
    for part in language.split(',').map(|s| s.trim()) {
-        let lang = part.to_lowercase();
-        match lang.as_str() {
-            "c" => out.extend(["c"]),
-            "c++" | "cpp" | "cxx" => out.extend(["cpp", "cxx", "cc"]),
-            "asm" => out.extend(["s", "S", "asm"]),
-            _ => {}
+        if let Some(lang) = crate::core::build::language::language_for_token(part) {
+            out.extend(lang.extensions().iter().copied());
        }
    }
    if out.is_empty() {
@@ -331,7 +336,7 @@ pub fn needs_rebuild(source: &str, object: &str) -> bool {
                    return true;
                }
            } else {
-                return true; // Missing dependency triggers rebuild
+                return true;
            }
        }
    }
@@ -537,7 +542,6 @@ mod tests {
        let src = dir.join("test.c");
        let obj = dir.join("test.o");
        fs::write(&src, "int main() {}").unwrap();
-        // Sleep briefly to ensure mtime difference
        std::thread::sleep(std::time::Duration::from_millis(50));
        fs::write(&obj, "").unwrap();
        assert!(!needs_rebuild(
--- a/src/core/build/engine.rs
+++ b/src/core/build/engine.rs
--- a/src/core/build/language/asm/common.rs
+++ b/src/core/build/language/asm/common.rs
@@ -0,0 +1,173 @@
+use crate::core::build::builder::BuildContext;
+use crate::core::build::builder::artifact;
+use crate::core::build::common;
+use crate::utils::build::{is_compile_only, is_flat_bin};
+use std::path::Path;
+use std::time::Instant;
+
+pub fn filter_asm_flags(flags: &[String]) -> Vec<String> {
+    flags
+        .iter()
+        .filter(|f| {
+            let f = f.as_str();
+            f.starts_with("-I") || f.starts_with("-i") || f == "-g"
+        })
+        .cloned()
+        .collect()
+}
+
+pub fn build_assembly<F>(
+    ctx: &BuildContext,
+    backend_name: &str,
+    default_assembler: &str,
+    extensions: &[&str],
+    build_object: F,
+) -> Result<f64, String>
+where
+    F: Fn(&str, &str, &str, &BuildContext) -> Result<(), String> + Sync,
+{
+    build_assembly_with_mode(
+        ctx,
+        backend_name,
+        default_assembler,
+        extensions,
+        FlatEmit::Direct,
+        build_object,
+    )
+}
+
+pub fn build_assembly_via_objcopy<F>(
+    ctx: &BuildContext,
+    backend_name: &str,
+    default_assembler: &str,
+    extensions: &[&str],
+    build_object: F,
+) -> Result<f64, String>
+where
+    F: Fn(&str, &str, &str, &BuildContext) -> Result<(), String> + Sync,
+{
+    build_assembly_with_mode(
+        ctx,
+        backend_name,
+        default_assembler,
+        extensions,
+        FlatEmit::ViaObjcopy,
+        build_object,
+    )
+}
+
+#[derive(Clone, Copy)]
+enum FlatEmit {
+    Direct,
+    ViaObjcopy,
+}
+
+fn build_assembly_with_mode<F>(
+    ctx: &BuildContext,
+    backend_name: &str,
+    default_assembler: &str,
+    extensions: &[&str],
+    flat_mode: FlatEmit,
+    build_object: F,
+) -> Result<f64, String>
+where
+    F: Fn(&str, &str, &str, &BuildContext) -> Result<(), String> + Sync,
+{
+    let lang = ctx.language.to_lowercase();
+    if lang.split(',').any(|p| {
+        let t = p.trim();
+        t != "asm" && t != "llvm_ir" && t != "llvm-ir" && t != "ll"
+    }) {
+        return Err(format!(
+            "{backend_name} backend requires build.language = \"asm\" (or llvm_ir for LLC)"
+        ));
+    }
+
+    let assembler = if ctx.compiler.is_empty() {
+        default_assembler
+    } else {
+        ctx.compiler
+    };
+
+    let start_time = Instant::now();
+    let sources = common::collect_sources(
+        ctx.source_roots,
+        extensions,
+        ctx.exclude_dirs,
+        ctx.include_paths,
+    )?;
+
+    let flat = is_flat_bin(ctx.kind);
+    let obj_dir = match ctx.target_dir {
+        Some(dir) => Path::new(dir).join("obj"),
+        None => Path::new("./target").join(ctx.profile).join("obj"),
+    };
+
+    let objects = match (flat, flat_mode) {
+        (true, FlatEmit::Direct) => {
+            let outs: Vec<String> = sources
+                .iter()
+                .map(|s| artifact::flat_source_output_path(ctx, s))
+                .collect();
+            common::parallel_build(
+                sources.len(),
+                |i| build_object(assembler, &sources[i], &outs[i], ctx),
+                ctx.codegen_units,
+            )?;
+            outs
+        }
+        (true, FlatEmit::ViaObjcopy) => {
+            let intermediates: Vec<String> = sources
+                .iter()
+                .map(|s| common::object_path(&obj_dir, s, "o"))
+                .collect();
+            common::parallel_build(
+                sources.len(),
+                |i| build_object(assembler, &sources[i], &intermediates[i], ctx),
+                ctx.codegen_units,
+            )?;
+            let mut outs = Vec::with_capacity(sources.len());
+            for (i, src) in sources.iter().enumerate() {
+                let out = artifact::flat_source_output_path(ctx, src);
+                artifact::objcopy_binary(ctx, &intermediates[i], &out)?;
+                outs.push(out);
+            }
+            outs
+        }
+        (false, _) => build_objects_common(assembler, &sources, &obj_dir, ctx, &build_object)?,
+    };
+
+    if is_compile_only(ctx.kind) {
+        return Ok(common::elapsed_secs(start_time));
+    }
+
+    if ctx.kind == "staticlib" {
+        return artifact::archive_static(ctx, &objects, start_time);
+    }
+
+    artifact::link_binary(ctx, &objects, "cc", start_time)
+}
+
+fn build_objects_common<F>(
+    assembler: &str,
+    sources: &[String],
+    obj_dir: &Path,
+    ctx: &BuildContext,
+    build_object: &F,
+) -> Result<Vec<String>, String>
+where
+    F: Fn(&str, &str, &str, &BuildContext) -> Result<(), String> + Sync,
+{
+    let objects: Vec<String> = sources
+        .iter()
+        .map(|s| common::object_path(obj_dir, s, "o"))
+        .collect();
+
+    common::parallel_build(
+        sources.len(),
+        |i| build_object(assembler, &sources[i], &objects[i], ctx),
+        ctx.codegen_units,
+    )?;
+
+    Ok(objects)
+}
--- a/src/core/build/language/asm/fasm/mod.rs
+++ b/src/core/build/language/asm/fasm/mod.rs
@@ -1,6 +1,6 @@
-use crate::core::builder::BuildContext;
-use crate::core::builder::asm;
-use crate::core::builder::common;
+use crate::core::build::builder::BuildContext;
+use crate::core::build::common;
+use crate::core::build::language::asm::common as asm;
 use std::fs;
 use std::path::Path;
 use std::process::Command;
@@ -35,7 +35,7 @@ fn build_object(
    let mut cmd = Command::new(assembler);
    cmd.arg(source).arg(obj_path);

-    for flag in ctx.cflags {
+    for flag in crate::core::build::language::asm::common::filter_asm_flags(ctx.cflags) {
        cmd.arg(flag);
    }

--- a/src/core/build/language/asm/gas/mod.rs
+++ b/src/core/build/language/asm/gas/mod.rs
@@ -15,15 +15,24 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.

-use crate::core::builder::BuildContext;
-use crate::core::builder::asm;
-use crate::core::builder::common;
+use crate::core::build::builder::BuildContext;
+use crate::core::build::common;
+use crate::core::build::language::asm::common as asm;
 use std::fs;
 use std::path::Path;
 use std::process::Command;

 pub fn build(ctx: &BuildContext) -> Result<f64, String> {
-    asm::build_assembly(ctx, "GAS", "as", &["s"], build_object)
+    // Use full path to as
+    let as_path = std::process::Command::new("which")
+        .arg("as")
+        .output()
+        .ok()
+        .and_then(|o| String::from_utf8(o.stdout).ok())
+        .map(|s| s.trim().to_string())
+        .filter(|s| !s.is_empty())
+        .unwrap_or_else(|| "as".to_string());
+    asm::build_assembly_via_objcopy(ctx, "GAS", &as_path, &["s"], build_object)
 }

 pub(crate) fn collect_sources(ctx: &BuildContext) -> Result<Vec<String>, String> {
@@ -52,9 +61,13 @@ fn build_object(
    let mut cmd = Command::new(assembler);
    cmd.arg(source).arg("-o").arg(obj_path);

-    for flag in ctx.cflags {
+    for flag in crate::core::build::language::asm::common::filter_asm_flags(ctx.cflags) {
        cmd.arg(flag);
    }

+    if ctx.verbose || std::env::var("DCR_DEBUG").is_ok() {
+        eprintln!("[dcr] {:?}", cmd);
+    }
+
    common::run_command_sync_output(&mut cmd)
 }
--- a/src/core/build/language/asm/masm/mod.rs
+++ b/src/core/build/language/asm/masm/mod.rs
@@ -1,12 +1,12 @@
-use crate::core::builder::BuildContext;
-use crate::core::builder::asm;
-use crate::core::builder::common;
+use crate::core::build::builder::BuildContext;
+use crate::core::build::common;
+use crate::core::build::language::asm::common as asm;
 use std::fs;
 use std::path::Path;
 use std::process::Command;

 pub fn build(ctx: &BuildContext) -> Result<f64, String> {
-    asm::build_assembly(ctx, "MASM", "ml", &["asm"], build_object)
+    asm::build_assembly_via_objcopy(ctx, "MASM", "ml", &["asm"], build_object)
 }

 pub(crate) fn collect_sources(ctx: &BuildContext) -> Result<Vec<String>, String> {
@@ -39,7 +39,7 @@ fn build_object(
        .arg(obj_path)
        .arg(source);

-    for flag in ctx.cflags {
+    for flag in crate::core::build::language::asm::common::filter_asm_flags(ctx.cflags) {
        cmd.arg(flag);
    }

--- a/src/core/build/language/asm/mod.rs
+++ b/src/core/build/language/asm/mod.rs
@@ -0,0 +1,38 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+pub mod common;
+pub mod fasm;
+pub mod gas;
+pub mod masm;
+pub mod nasm;
+
+use crate::core::build::language::Language;
+
+pub struct Asm;
+
+impl Language for Asm {
+    fn id(&self) -> &'static str {
+        "asm"
+    }
+    fn extensions(&self) -> &'static [&'static str] {
+        &["s", "S", "asm"]
+    }
+    fn matches_token(&self, token: &str) -> bool {
+        token.eq_ignore_ascii_case("asm")
+    }
+}
--- a/src/core/build/language/asm/nasm/mod.rs
+++ b/src/core/build/language/asm/nasm/mod.rs
@@ -15,22 +15,22 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.

-use crate::core::builder::BuildContext;
-use crate::core::builder::asm;
-use crate::core::builder::common;
+use crate::core::build::builder::BuildContext;
+use crate::core::build::common;
+use crate::core::build::language::asm::common as asm;
 use std::fs;
 use std::path::Path;
 use std::process::Command;

 pub fn build(ctx: &BuildContext) -> Result<f64, String> {
-    asm::build_assembly(ctx, "NASM", "nasm", &["asm", "s"], build_object)
+    asm::build_assembly(ctx, "NASM", "nasm", &["asm"], build_object)
 }

 pub(crate) fn collect_sources(ctx: &BuildContext) -> Result<Vec<String>, String> {
-    // NASM handles lowercase .s and .asm only (not .S which is GCC preprocessed)
+    // NASM handles .asm only (not .s which is GAS syntax, not .S which is GCC preprocessed)
    common::collect_sources(
        ctx.source_roots,
-        &["asm", "s"],
+        &["asm"],
        ctx.exclude_dirs,
        ctx.include_paths,
    )
@@ -50,7 +50,11 @@ fn build_object(
        return Ok(());
    }

-    let format = nasm_format(ctx.platform);
+    let format = if crate::utils::build::is_flat_bin(ctx.kind) {
+        "bin"
+    } else {
+        nasm_format(ctx.platform)
+    };

    let mut cmd = Command::new(assembler);
    cmd.arg("-f")
@@ -59,7 +63,7 @@ fn build_object(
        .arg("-o")
        .arg(obj_path);

-    for flag in ctx.cflags {
+    for flag in crate::core::build::language::asm::common::filter_asm_flags(ctx.cflags) {
        cmd.arg(flag);
    }

--- a/src/core/build/language/c/mod.rs
+++ b/src/core/build/language/c/mod.rs
@@ -0,0 +1,32 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use crate::core::build::language::Language;
+
+pub struct C;
+
+impl Language for C {
+    fn id(&self) -> &'static str {
+        "c"
+    }
+    fn extensions(&self) -> &'static [&'static str] {
+        &["c"]
+    }
+    fn matches_token(&self, token: &str) -> bool {
+        token.eq_ignore_ascii_case("c")
+    }
+}
--- a/src/core/build/language/cxx/mod.rs
+++ b/src/core/build/language/cxx/mod.rs
@@ -0,0 +1,34 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+pub mod qt;
+
+use crate::core::build::language::Language;
+
+pub struct Cxx;
+
+impl Language for Cxx {
+    fn id(&self) -> &'static str {
+        "cxx"
+    }
+    fn extensions(&self) -> &'static [&'static str] {
+        &["cpp", "cxx", "cc"]
+    }
+    fn matches_token(&self, token: &str) -> bool {
+        matches!(token.to_lowercase().as_str(), "c++" | "cpp" | "cxx")
+    }
+}
--- a/src/core/build/language/cxx/qt.rs
+++ b/src/core/build/language/cxx/qt.rs
@@ -15,8 +15,8 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.

-use crate::core::builder::BuildContext;
-use crate::core::builder::common;
+use crate::core::build::builder::BuildContext;
+use crate::core::build::common;
 use crate::utils::build::run_pkg_config;
 use std::fs;
 use std::path::{Path, PathBuf};
@@ -34,14 +34,12 @@ pub fn process_qt(ctx: &BuildContext, build_dir: &Path) -> Result<Option<PathBuf
        ctx.include_paths,
    )?;

-    // Fetch Qt system include paths and defines for MOC
    let mut qt_moc_args = Vec::new();
    let qt_modules = vec!["Qt6Core", "Qt6Widgets", "Qt6Gui", "Qt6Svg"];

    for module in qt_modules {
        if let Ok(cflags) = run_pkg_config(module, "--cflags") {
            for flag in cflags.split_whitespace() {
-                // Pass both -I and -D flags to moc
                if flag.starts_with("-I") || flag.starts_with("-D") {
                    qt_moc_args.push(flag.to_string());
                }
@@ -96,12 +94,10 @@ pub fn process_qt(ctx: &BuildContext, build_dir: &Path) -> Result<Option<PathBuf

                        let mut moc_args = Vec::new();

-                        // Add Qt system cflags (includes + defines)
                        for arg in &qt_moc_args {
                            moc_args.push(arg.as_str());
                        }

-                        // Add project include paths
                        for inc in ctx.include_paths.iter().chain(ctx.include_dirs.iter()) {
                            moc_args.push("-I");
                            moc_args.push(inc);
--- a/src/core/build/language/llvm_ir/mod.rs
+++ b/src/core/build/language/llvm_ir/mod.rs
@@ -1,12 +1,27 @@
-use crate::core::builder::BuildContext;
-use crate::core::builder::asm;
-use crate::core::builder::common;
+use crate::core::build::builder::BuildContext;
+use crate::core::build::common;
+use crate::core::build::language::Language;
+use crate::core::build::language::asm::common as asm;
 use std::fs;
 use std::path::Path;
 use std::process::Command;

+pub struct LlvmIr;
+
+impl Language for LlvmIr {
+    fn id(&self) -> &'static str {
+        "llvm_ir"
+    }
+    fn extensions(&self) -> &'static [&'static str] {
+        &["ll"]
+    }
+    fn matches_token(&self, token: &str) -> bool {
+        matches!(token.to_lowercase().as_str(), "llvm_ir" | "llvm-ir" | "ll")
+    }
+}
+
 pub fn build(ctx: &BuildContext) -> Result<f64, String> {
-    asm::build_assembly(ctx, "LLVM-IR", "llc", &["ll"], build_object)
+    asm::build_assembly_via_objcopy(ctx, "LLVM-IR", "llc", &["ll"], build_object)
 }

 pub(crate) fn collect_sources(ctx: &BuildContext) -> Result<Vec<String>, String> {
--- a/src/core/build/language/mod.rs
+++ b/src/core/build/language/mod.rs
@@ -0,0 +1,57 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+pub mod asm;
+pub mod c;
+pub mod cxx;
+pub mod llvm_ir;
+
+pub trait Language {
+    fn id(&self) -> &'static str;
+    fn extensions(&self) -> &'static [&'static str];
+    fn matches_token(&self, token: &str) -> bool;
+}
+
+pub fn languages() -> [&'static dyn Language; 4] {
+    [&c::C, &cxx::Cxx, &asm::Asm, &llvm_ir::LlvmIr]
+}
+
+pub fn language_for_token(token: &str) -> Option<&'static dyn Language> {
+    languages().into_iter().find(|l| l.matches_token(token))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn tokens_resolve_to_languages() {
+        assert_eq!(language_for_token("c").unwrap().id(), "c");
+        assert_eq!(language_for_token("c++").unwrap().id(), "cxx");
+        assert_eq!(language_for_token("cpp").unwrap().id(), "cxx");
+        assert_eq!(language_for_token("cxx").unwrap().id(), "cxx");
+        assert_eq!(language_for_token("asm").unwrap().id(), "asm");
+        assert!(language_for_token("rust").is_none());
+    }
+
+    #[test]
+    fn languages_expose_expected_extensions() {
+        assert_eq!(c::C.extensions(), &["c"]);
+        assert_eq!(cxx::Cxx.extensions(), &["cpp", "cxx", "cc"]);
+        assert_eq!(asm::Asm.extensions(), &["s", "S", "asm"]);
+    }
+}
--- a/src/core/build/mod.rs
+++ b/src/core/build/mod.rs
@@ -0,0 +1,30 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+pub mod archive;
+pub mod builder;
+pub mod cache;
+pub mod common;
+pub mod engine;
+pub mod language;
+pub mod report;
+pub mod resolve;
+pub mod steps;
+
+pub use engine::run_build;
+pub use report::{BuildEvent, BuildReporter, BuildRequest};
+pub use resolve::get_build_string_with_profile;
--- a/src/core/build/report.rs
+++ b/src/core/build/report.rs
@@ -0,0 +1,83 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+// The reporter decouples the build engine from any particular frontend: the CLI
+// renders events as coloured lines, a TUI/GUI would push them into a widget and
+// MCP would serialise them to JSON. The engine only ever calls `on_event`.
+
+use std::sync::{Arc, atomic::AtomicBool};
+
+pub struct BuildRequest {
+    pub profile: String,
+    pub target: Option<String>,
+    pub force: bool,
+    pub verbose: bool,
+    pub workspace: Option<String>,
+    pub cancel: Arc<AtomicBool>,
+}
+
+#[allow(dead_code)]
+pub struct BuildOutcome {
+    pub secs: f64,
+}
+
+pub struct BuildError {
+    pub message: String,
+}
+
+impl From<String> for BuildError {
+    fn from(message: String) -> Self {
+        BuildError { message }
+    }
+}
+
+pub enum BuildEvent<'a> {
+    TargetStart {
+        index: usize,
+        total: usize,
+        target: &'a str,
+    },
+    ProjectStart {
+        name: &'a str,
+        profile: &'a str,
+        target: &'a str,
+    },
+    DepBuilding {
+        name: &'a str,
+        version: &'a str,
+    },
+    DepReady {
+        name: &'a str,
+        version: &'a str,
+        rebuilt: bool,
+    },
+    Compiling {
+        name: &'a str,
+        version: &'a str,
+    },
+    CompilerOutput {
+        stream: &'a str,
+        text: &'a str,
+    },
+    Finished {
+        secs: f64,
+    },
+}
+
+pub trait BuildReporter {
+    fn on_event(&mut self, event: BuildEvent<'_>);
+}
--- a/src/core/build/resolve.rs
+++ b/src/core/build/resolve.rs
@@ -0,0 +1,232 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use crate::core::build_config::Config;
+use crate::utils::build::{get_config_str, normalize_target_os, profile_table};
+
+pub(crate) fn get_config_value_raw(
+    config: &Config,
+    section: &str,
+    field: &str,
+    profile: &str,
+    target: Option<&str>,
+) -> Option<toml::Value> {
+    // Order: target.profile, profile.target, target, profile, base
+    let keys = [
+        target.map(|t| {
+            format!(
+                "{}.{}.{}.{}",
+                section,
+                normalize_target_os(t),
+                profile,
+                field
+            )
+        }),
+        target.map(|t| {
+            format!(
+                "{}.{}.{}.{}",
+                section,
+                profile,
+                normalize_target_os(t),
+                field
+            )
+        }),
+        target.map(|t| format!("{}.{}.{}", section, normalize_target_os(t), field)),
+        Some(format!("{}.{}.{}", section, profile, field)),
+        Some(format!("{}.{}", section, field)),
+    ];
+    for key in keys.into_iter().flatten() {
+        if let Some(val) = config.get(&key) {
+            return Some(val.clone());
+        }
+    }
+    None
+}
+
+pub(crate) fn get_inherit(
+    config: &Config,
+    section: &str,
+    profile: &str,
+    target: Option<&str>,
+) -> bool {
+    get_config_value_raw(config, section, "inherit", profile, target)
+        .and_then(|v| v.as_bool())
+        .unwrap_or(true)
+}
+
+pub(crate) fn get_config_value(
+    config: &Config,
+    section: &str,
+    field: &str,
+    profile: &str,
+    target: Option<&str>,
+) -> Option<String> {
+    get_config_value_raw(config, section, field, profile, target)
+        .and_then(|v| v.as_str().map(|s| s.trim().to_string()))
+        .filter(|s| !s.is_empty())
+}
+
+pub(crate) fn get_string_with_profile_and_target(
+    config: &Config,
+    field: &str,
+    profile: &str,
+    target: Option<&str>,
+) -> String {
+    if get_inherit(config, "build", profile, target) {
+        get_config_value(config, "build", field, profile, target)
+            .unwrap_or_else(|| get_config_str(config, &format!("build.{field}")))
+    } else {
+        get_config_value(config, "build", field, profile, target).unwrap_or_default()
+    }
+}
+
+pub fn get_build_string_with_profile(config: &Config, field: &str, profile: &str) -> String {
+    get_string_with_profile_and_target(config, field, profile, None)
+}
+
+pub(crate) fn get_lang_string(
+    config: &Config,
+    lang: &str,
+    field: &str,
+    profile: &str,
+    target: Option<&str>,
+) -> Option<String> {
+    get_config_value(config, &format!("build.{lang}"), field, profile, target)
+}
+
+pub(crate) fn get_lang_list(
+    config: &Config,
+    lang: &str,
+    field: &str,
+    profile: &str,
+    target: Option<&str>,
+) -> Result<Vec<String>, String> {
+    match get_config_value_raw(config, &format!("build.{lang}"), field, profile, target) {
+        Some(val) => parse_string_array(&val, field),
+        None => Ok(Vec::new()),
+    }
+}
+
+pub(crate) fn parse_string_array(value: &toml::Value, key: &str) -> Result<Vec<String>, String> {
+    let arr = value
+        .as_array()
+        .ok_or_else(|| format!("{key} must be an array of strings"))?;
+    let mut out = Vec::new();
+    for item in arr {
+        let s = item
+            .as_str()
+            .ok_or_else(|| format!("{key} must be an array of strings"))?;
+        out.push(s.to_string());
+    }
+    Ok(out)
+}
+
+pub(crate) fn get_list_with_profile_and_target(
+    config: &Config,
+    field: &str,
+    profile: &str,
+    target: Option<&str>,
+) -> Result<Vec<String>, String> {
+    let inherit = get_inherit(config, "build", profile, target);
+    let mut out = if inherit {
+        get_config_list(config, &format!("build.{field}"))?
+    } else {
+        Vec::new()
+    };
+    if let Some(val) = get_config_value_raw(config, "build", field, profile, target) {
+        if let Some(_arr) = val.as_array() {
+            let is_base = inherit
+                && config
+                    .get(&format!("build.{field}"))
+                    .map(|v| v == &val)
+                    .unwrap_or(false);
+            if !is_base {
+                let custom = parse_string_array(&val, &format!("build.{field}"))?;
+                if inherit {
+                    out.extend(custom);
+                } else {
+                    out = custom;
+                }
+            }
+        }
+    } else if inherit {
+        if let Some(table) = profile_table(config, profile)
+            && let Some(value) = table.get(field)
+        {
+            let mut extra = parse_string_array(value, &format!("build.{profile}.{field}"))?;
+            out.append(&mut extra);
+        }
+        if let Some(t) = target {
+            let normalized_t = normalize_target_os(t);
+            if let Some(table) = profile_table(config, normalized_t)
+                && let Some(value) = table.get(field)
+            {
+                let mut extra =
+                    parse_string_array(value, &format!("build.{normalized_t}.{field}"))?;
+                out.append(&mut extra);
+            }
+        }
+    }
+    Ok(out)
+}
+
+pub(crate) fn get_list_with_profile(
+    config: &Config,
+    field: &str,
+    profile: &str,
+) -> Result<Vec<String>, String> {
+    get_list_with_profile_and_target(config, field, profile, None)
+}
+
+pub(crate) fn get_targets(config: &Config, profile: &str) -> Result<Vec<String>, String> {
+    get_list_with_profile(config, "targets", profile)
+}
+
+pub(crate) fn get_config_list(config: &Config, key: &str) -> Result<Vec<String>, String> {
+    let value = match config.get(key) {
+        Some(v) => v,
+        None => return Ok(Vec::new()),
+    };
+    let arr = value
+        .as_array()
+        .ok_or_else(|| format!("{key} must be an array of strings"))?;
+    let mut out = Vec::new();
+    for item in arr {
+        let s = item
+            .as_str()
+            .ok_or_else(|| format!("{key} must be an array of strings"))?;
+        out.push(s.to_string());
+    }
+    Ok(out)
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::utils::build::normalize_target_os;
+
+    #[test]
+    fn test_normalize_target_os() {
+        assert_eq!(normalize_target_os("linux"), "x86_64-unknown-linux-gnu");
+        assert_eq!(normalize_target_os("macos"), "x86_64-apple-darwin");
+        assert_eq!(normalize_target_os("windows"), "x86_64-pc-windows-msvc");
+        assert_eq!(
+            normalize_target_os("x86_64-unknown-linux-gnu"),
+            "x86_64-unknown-linux-gnu"
+        );
+        assert_eq!(normalize_target_os("unknown"), "unknown");
+    }
+}
--- a/src/core/build/steps.rs
+++ b/src/core/build/steps.rs
@@ -0,0 +1,398 @@
+// DCR — Cargo-like C/C++ project manager.
+//
+// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use crate::core::build::engine::ToolchainExecs;
+use crate::core::build_config::Config;
+use crate::utils::build::{VersionInfo, profile_table, substitute_vars};
+use glob::glob;
+use std::fs;
+use std::path::{Path, PathBuf};
+
+#[derive(Clone)]
+pub(crate) struct BuildStep {
+    name: String,
+    input: String,
+    output: String,
+    cmd: String,
+}
+
+pub(crate) struct StepVars<'a> {
+    pub(crate) profile: &'a str,
+    pub(crate) version: &'a str,
+    pub(crate) version_major: &'a str,
+    pub(crate) version_minor: &'a str,
+    pub(crate) version_patch: &'a str,
+    pub(crate) version_suffix: &'a str,
+    pub(crate) version_suffix_dash: &'a str,
+}
+
+fn get_build_steps_from_value(value: &toml::Value, key: &str) -> Result<Vec<BuildStep>, String> {
+    let arr = value
+        .as_array()
+        .ok_or_else(|| format!("{key} must be an array"))?;
+    let mut out = Vec::new();
+    for item in arr {
+        let tbl = item
+            .as_table()
+            .ok_or_else(|| format!("{key} entries must be tables"))?;
+        let name = tbl
+            .get("name")
+            .and_then(|v| v.as_str())
+            .unwrap_or("")
+            .trim()
+            .to_string();
+        let input = tbl
+            .get("in")
+            .and_then(|v| v.as_str())
+            .unwrap_or("")
+            .trim()
+            .to_string();
+        let output = tbl
+            .get("out")
+            .and_then(|v| v.as_str())
+            .unwrap_or("")
+            .trim()
+            .to_string();
+        let cmd = tbl
+            .get("cmd")
+            .and_then(|v| v.as_str())
+            .unwrap_or("")
+            .trim()
+            .to_string();
+        if name.is_empty() || input.is_empty() || output.is_empty() || cmd.is_empty() {
+            return Err(format!("{key} entries must include name, in, out, cmd"));
+        }
+        out.push(BuildStep {
+            name,
+            input,
+            output,
+            cmd,
+        });
+    }
+    Ok(out)
+}
+
+pub(crate) fn get_build_steps_with_profile(
+    config: &Config,
+    field: &str,
+    profile: &str,
+) -> Result<Vec<BuildStep>, String> {
+    if let Some(table) = profile_table(config, profile)
+        && let Some(value) = table.get(field)
+    {
+        return get_build_steps_from_value(value, &format!("build.{profile}.{field}"));
+    }
+    get_build_steps(config, &format!("build.{field}"))
+}
+
+fn get_build_steps(config: &Config, key: &str) -> Result<Vec<BuildStep>, String> {
+    let value = match config.get(key) {
+        Some(v) => v,
+        None => return Ok(Vec::new()),
+    };
+    get_build_steps_from_value(value, key)
+}
+
+use crate::core::build::report::{BuildEvent, BuildReporter};
+use std::sync::{Arc, atomic::AtomicBool};
+
+pub(crate) fn run_build_steps(
+    steps: &[BuildStep],
+    tools: &ToolchainExecs,
+    step_flags: &str,
+    vars: &StepVars,
+    cancel: &Arc<AtomicBool>,
+    rep: &mut dyn BuildReporter,
+) -> Result<(), String> {
+    for step in steps {
+        if cancel.load(std::sync::atomic::Ordering::SeqCst) {
+            return Err("Build interrupted".to_string());
+        }
+        run_build_step(step, tools, step_flags, vars, cancel, rep)?;
+    }
+    Ok(())
+}
+
+fn run_build_step(
+    step: &BuildStep,
+    tools: &ToolchainExecs,
+    step_flags: &str,
+    vars: &StepVars,
+    cancel: &Arc<AtomicBool>,
+    rep: &mut dyn BuildReporter,
+) -> Result<(), String> {
+    let input_pattern = expand_step_value(&step.input, "", vars);
+    let inputs = expand_glob(&input_pattern)?;
+    if inputs.is_empty() {
+        return Ok(());
+    }
+    let needs_stem = step.output.contains("{stem}");
+    if inputs.len() > 1 && !needs_stem {
+        return Err(format!(
+            "build.steps '{}' output must include {{stem}} for multiple inputs",
+            step.name
+        ));
+    }
+    for input in inputs {
+        if !input.is_file() {
+            continue;
+        }
+        let stem = input.file_stem().and_then(|v| v.to_str()).unwrap_or("");
+        let out_path = PathBuf::from(expand_step_value(&step.output, stem, vars));
+        if !should_run_step(&input, &out_path) {
+            continue;
+        }
+        if let Some(parent) = out_path.parent() {
+            fs::create_dir_all(parent)
+                .map_err(|err| format!("Failed to create step output dir: {err}"))?;
+        }
+        let cmd = substitute_step_cmd(&step.cmd, &input, &out_path, tools, step_flags, stem, vars);
+        let status = run_shell_command(&cmd, cancel, rep)
+            .map_err(|err| format!("Failed to run step '{}': {err}", step.name))?;
+        if !status.success() {
+            return Err(format!("Step '{}' failed", step.name));
+        }
+    }
+    Ok(())
+}
+
+pub(crate) fn clean_generated_files(patterns: &[String]) -> Result<(), String> {
+    for pattern in patterns {
+        for path in expand_glob(pattern)? {
+            if path.is_file() {
+                let _ = fs::remove_file(&path);
+            }
+        }
+    }
+    Ok(())
+}
+
+pub(crate) fn expand_glob(pattern: &str) -> Result<Vec<PathBuf>, String> {
+    let mut out = Vec::new();
+    let entries = glob(pattern).map_err(|err| format!("glob error: {err}"))?;
+    for entry in entries {
+        let path = entry.map_err(|err| format!("glob error: {err}"))?;
+        out.push(path);
+    }
+    Ok(out)
+}
+
+pub(crate) fn verify_expectations(patterns: &[String], vars: &StepVars) -> Result<(), String> {
+    for pattern in patterns {
+        let expanded = expand_step_value(pattern, "", vars);
+        let matches = expand_glob(&expanded)?;
+        if matches.is_empty() {
+            return Err(format!("Expected artifact not found: {expanded}"));
+        }
+    }
+    Ok(())
+}
+
+fn should_run_step(input: &Path, output: &Path) -> bool {
+    let in_time = fs::metadata(input).and_then(|m| m.modified());
+    let out_time = fs::metadata(output).and_then(|m| m.modified());
+    match (in_time, out_time) {
+        (Ok(i), Ok(o)) => i > o,
+        (Ok(_), Err(_)) => true,
+        _ => true,
+    }
+}
+
+fn substitute_step_cmd(
+    template: &str,
+    input: &Path,
+    output: &Path,
+    tools: &ToolchainExecs,
+    step_flags: &str,
+    stem: &str,
+    vars: &StepVars,
+) -> String {
+    let info = make_version_info(vars);
+    let s = substitute_vars(template, &info, vars.profile, "");
+    s.replace("{in}", &input.to_string_lossy())
+        .replace("{out}", &output.to_string_lossy())
+        .replace("{uic}", &tools.uic)
+        .replace("{moc}", &tools.moc)
+        .replace("{rcc}", &tools.rcc)
+        .replace("{cflags}", step_flags)
+        .replace("{stem}", stem)
+}
+
+pub(crate) fn build_step_flags(
+    cflags: &[String],
+    include_dirs: &[String],
+    compiler: &str,
+) -> String {
+    let mut out = Vec::new();
+    let msvc_style = is_msvc_compiler(compiler) || cflags.iter().any(|f| f.starts_with('/'));
+    for flag in cflags {
+        if flag.starts_with("-I") || flag.starts_with("-D") {
+            out.push(flag.clone());
+        }
+        if flag.starts_with("/I") || flag.starts_with("/D") {
+            out.push(flag.clone());
+        }
+        if msvc_style && flag.starts_with("-D") {
+            out.push(format!("/D{}", flag.trim_start_matches("-D")));
+        }
+    }
+    for dir in include_dirs {
+        out.push(format!("-I{dir}"));
+        if msvc_style {
+            out.push(format!("/I{dir}"));
+        }
+    }
+    out.sort();
+    out.dedup();
+    out.into_iter()
+        .map(quote_step_arg)
+        .collect::<Vec<_>>()
+        .join(" ")
+}
+
+fn quote_step_arg(arg: String) -> String {
+    if !arg.chars().any(|c| c.is_whitespace() || c == '"') {
+        return arg;
+    }
+    let escaped = arg.replace('"', "\\\"");
+    format!("\"{escaped}\"")
+}
+
+fn is_msvc_compiler(compiler: &str) -> bool {
+    let lower = compiler.to_lowercase();
+    lower.contains("cl.exe")
+        || lower == "cl"
+        || lower.contains("clang-cl")
+        || lower.contains("msvc")
+}
+
+fn run_shell_command(
+    cmd: &str,
+    cancel: &Arc<AtomicBool>,
+    rep: &mut dyn BuildReporter,
+) -> Result<std::process::ExitStatus, std::io::Error> {
+    let mut child = if cfg!(target_os = "windows") {
+        std::process::Command::new("cmd")
+            .arg("/C")
+            .arg(cmd)
+            .stdout(std::process::Stdio::piped())
+            .stderr(std::process::Stdio::piped())
+            .spawn()
+    } else {
+        std::process::Command::new("sh")
+            .arg("-c")
+            .arg(cmd)
+            .stdout(std::process::Stdio::piped())
+            .stderr(std::process::Stdio::piped())
+            .spawn()
+    }?;
+
+    let stdout = child.stdout.take().unwrap();
+    let stderr = child.stderr.take().unwrap();
+
+    use std::io::{BufRead, BufReader};
+    use std::sync::mpsc;
+
+    let (tx, rx) = mpsc::channel();
+
+    let cancel_clone = cancel.clone();
+    let tx_stdout = tx.clone();
+    let stdout_thread = std::thread::spawn(move || {
+        let reader = BufReader::new(stdout);
+        for line in reader.lines() {
+            if cancel_clone.load(std::sync::atomic::Ordering::SeqCst) {
+                break;
+            }
+            if let Ok(line) = line {
+                let _ = tx_stdout.send(("stdout", line));
+            }
+        }
+    });
+
+    let cancel_clone = cancel.clone();
+    let tx_stderr = tx.clone();
+    let stderr_thread = std::thread::spawn(move || {
+        let reader = BufReader::new(stderr);
+        for line in reader.lines() {
+            if cancel_clone.load(std::sync::atomic::Ordering::SeqCst) {
+                break;
+            }
+            if let Ok(line) = line {
+                let _ = tx_stderr.send(("stderr", line));
+            }
+        }
+    });
+
+    let status = child.wait()?;
+    let _ = stdout_thread.join();
+    let _ = stderr_thread.join();
+
+    drop(tx);
+    while let Ok((stream, text)) = rx.recv() {
+        rep.on_event(BuildEvent::CompilerOutput {
+            stream,
+            text: &text,
+        });
+    }
+
+    Ok(status)
+}
+
+pub(crate) fn build_steps_need_run(steps: &[BuildStep], vars: &StepVars) -> Result<bool, String> {
+    for step in steps {
+        let input_pattern = expand_step_value(&step.input, "", vars);
+        let inputs = expand_glob(&input_pattern)?;
+        if inputs.is_empty() {
+            continue;
+        }
+        let needs_stem = step.output.contains("{stem}");
+        if inputs.len() > 1 && !needs_stem {
+            return Err(format!(
+                "build.steps '{}' output must include {{stem}} for multiple inputs",
+                step.name
+            ));
+        }
+        for input in inputs {
+            if !input.is_file() {
+                continue;
+            }
+            let stem = input.file_stem().and_then(|v| v.to_str()).unwrap_or("");
+            let out_path = PathBuf::from(expand_step_value(&step.output, stem, vars));
+            if should_run_step(&input, &out_path) {
+                return Ok(true);
+            }
+        }
+    }
+    Ok(false)
+}
+
+fn make_version_info(vars: &StepVars) -> VersionInfo {
+    VersionInfo {
+        full: vars.version.to_string(),
+        major: vars.version_major.to_string(),
+        minor: vars.version_minor.to_string(),
+        patch: vars.version_patch.to_string(),
+        suffix: vars.version_suffix.to_string(),
+        suffix_dash: vars.version_suffix_dash.to_string(),
+    }
+}
+
+fn expand_step_value(template: &str, stem: &str, vars: &StepVars) -> String {
+    let info = make_version_info(vars);
+    let s = substitute_vars(template, &info, vars.profile, "");
+    s.replace("{stem}", stem)
+}
--- a/src/core/build_config.rs
+++ b/src/core/build_config.rs
@@ -21,6 +21,7 @@ use std::fs;
 use std::path::{Path, PathBuf};
 use toml::Value;
 use toml::map::Map;
+use toml_edit::{DocumentMut, Item, Table};

 const DEFAULT_VERSION: &str = "0.1.0";
 const DEFAULT_LANGUAGE: &str = "c";
@@ -35,6 +36,7 @@ const VALID_KINDS: &[&str] = &[
    "elf",
    "none",
    "custom",
+    "flat-bin",
 ];

 #[derive(Debug)]
@@ -42,6 +44,7 @@ pub enum ConfigError {
    Io(std::io::Error),
    TomlDe(toml::de::Error),
    TomlSer(toml::ser::Error),
+    TomlEdit(toml_edit::TomlError),
    Invalid(String),
 }

@@ -51,6 +54,7 @@ impl std::fmt::Display for ConfigError {
            ConfigError::Io(err) => write!(f, "I/O error: {err}"),
            ConfigError::TomlDe(err) => write!(f, "TOML parse error: {err}"),
            ConfigError::TomlSer(err) => write!(f, "TOML serialize error: {err}"),
+            ConfigError::TomlEdit(err) => write!(f, "TOML parse error: {err}"),
            ConfigError::Invalid(msg) => write!(f, "Invalid config: {msg}"),
        }
    }
@@ -80,6 +84,10 @@ pub struct Config {
    path: PathBuf,
    data: Value,
    typed: DcrConfig,
+    /// Editable document mirror of `data`, used for serialization. It preserves
+    /// comments, formatting, and any keys not modeled by the typed/raw views, so
+    /// `save()` never drops unknown sections (e.g. `[run]`, `[[build.post_steps]]`).
+    doc: DocumentMut,
 }

 #[allow(dead_code)]
@@ -95,6 +103,27 @@ pub struct DcrConfig {
    pub toolchain: Option<ToolchainConfig>,
    #[serde(default)]
    pub workspace: BTreeMap<String, WorkspaceMemberConfig>,
+    #[serde(default)]
+    pub archive: Option<ArchiveConfig>,
+}
+
+#[allow(dead_code)]
+#[derive(Debug, Clone, Deserialize)]
+pub struct ArchiveConfig {
+    pub output: String,
+    pub format: String,
+    pub size: Option<String>,
+    pub offset: Option<String>,
+    pub label: Option<String>,
+    pub bootsector: Option<String>,
+    #[serde(default)]
+    pub layout: Vec<ArchiveLayout>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct ArchiveLayout {
+    pub from: String,
+    pub to: String,
 }

 #[derive(Debug, Clone, Deserialize)]
@@ -105,14 +134,24 @@ pub struct PackageConfig {
    pub pkg_type: Option<String>,
 }

+fn default_language() -> LanguageConfig {
+    LanguageConfig::One(DEFAULT_LANGUAGE.to_string())
+}
+
+fn default_compiler() -> String {
+    DEFAULT_COMPILER.to_string()
+}
+
 #[allow(dead_code)]
 #[derive(Debug, Clone, Deserialize)]
 pub struct BuildConfig {
+    #[serde(default = "default_language")]
    pub language: LanguageConfig,
    #[serde(default)]
    pub standard: Option<String>,
    #[serde(default)]
    pub cxx_standard: Option<String>,
+    #[serde(default = "default_compiler")]
    pub compiler: String,
    #[serde(default)]
    pub kind: Option<String>,
@@ -182,20 +221,29 @@ pub struct WorkspaceMemberConfig {
    pub path: String,
    #[serde(default)]
    pub deps: Vec<String>,
+    #[serde(default)]
+    pub main: Option<bool>,
 }

 impl Config {
    pub fn new(path: &str) -> Result<Self, ConfigError> {
        let path = PathBuf::from(path);
-        let data = if path.exists() {
-            read_toml(&path)?
+        let (data, doc) = if path.exists() {
+            load_parts(&path)?
        } else {
-            let default_value = default_toml()?;
-            write_toml(&path, &default_value)?;
-            default_value
+            let content = default_toml_text();
+            let doc: DocumentMut = content.parse().map_err(ConfigError::TomlEdit)?;
+            fs::write(&path, doc.to_string())?;
+            let data: Value = toml::from_str(&content)?;
+            (data, doc)
        };
        let typed = parse_typed_config(&data)?;
-        let cfg = Self { path, data, typed };
+        let cfg = Self {
+            path,
+            data,
+            typed,
+            doc,
+        };
        cfg.validate()?;
        Ok(cfg)
    }
@@ -205,9 +253,14 @@ impl Config {
        if !path.exists() {
            return Err(ConfigError::Invalid("dcr.toml not found".into()));
        }
-        let data = read_toml(&path)?;
+        let (data, doc) = load_parts(&path)?;
        let typed = parse_typed_config(&data)?;
-        let cfg = Self { path, data, typed };
+        let cfg = Self {
+            path,
+            data,
+            typed,
+            doc,
+        };
        cfg.validate()?;
        Ok(cfg)
    }
@@ -347,6 +400,13 @@ impl Config {
            .as_ref()
            .ok_or_else(|| ConfigError::Invalid("missing [build] section (required)".into()))?;

+        // For workspace_only projects, [build] section is optional
+        // and language/compiler are not required
+        if build.workspace_only {
+            self.validate_workspace()?;
+            return Ok(());
+        }
+
        if pkg.name.trim().is_empty() {
            return Err(ConfigError::Invalid("package.name is empty".into()));
        }
@@ -421,22 +481,35 @@ impl Config {
    }

    pub fn save(&self) -> Result<(), ConfigError> {
-        write_toml(&self.path, &self.data)
+        fs::write(&self.path, self.doc.to_string())?;
+        Ok(())
    }

    fn set(&mut self, key: &str, value: Value) -> Result<(), ConfigError> {
        let parts: Vec<&str> = key.split('.').collect();
-        let previous = self.data.clone();
-        set_path(&mut self.data, &parts, value)?;
+        let previous_data = self.data.clone();
+        let previous_doc = self.doc.clone();
+
+        if let Err(err) = set_doc_path(&mut self.doc, &parts, &value) {
+            self.doc = previous_doc;
+            return Err(err);
+        }
+        if let Err(err) = set_path(&mut self.data, &parts, value) {
+            self.data = previous_data;
+            self.doc = previous_doc;
+            return Err(err);
+        }
        self.typed = match parse_typed_config(&self.data) {
            Ok(typed) => typed,
            Err(err) => {
-                self.data = previous;
+                self.data = previous_data;
+                self.doc = previous_doc;
                return Err(err);
            }
        };
        if let Err(err) = self.validate() {
-            self.data = previous;
+            self.data = previous_data;
+            self.doc = previous_doc;
            self.typed = parse_typed_config(&self.data)?;
            return Err(err);
        }
@@ -658,235 +731,119 @@ impl Config {
    }
 }

-fn read_toml(path: &Path) -> Result<Value, ConfigError> {
+fn load_parts(path: &Path) -> Result<(Value, DocumentMut), ConfigError> {
    let content = fs::read_to_string(path)?;
-    Ok(toml::from_str(&content)?)
+    let data: Value = toml::from_str(&content)?;
+    let doc: DocumentMut = content.parse().map_err(ConfigError::TomlEdit)?;
+    Ok((data, doc))
 }

-fn write_toml(path: &Path, value: &Value) -> Result<(), ConfigError> {
-    let content = format_toml(value)?;
-    fs::write(path, content)?;
-    Ok(())
-}
-
-fn default_toml() -> Result<Value, ConfigError> {
+fn default_toml_text() -> String {
    let name = std::env::current_dir()
        .ok()
        .and_then(|p| p.file_name().map(|v| v.to_string_lossy().to_string()))
        .unwrap_or_else(|| "project".to_string());

-    let mut package = Map::new();
-    package.insert("name".to_string(), Value::String(name));
-    package.insert(
-        "version".to_string(),
-        Value::String(DEFAULT_VERSION.to_string()),
-    );
-    package.insert("type".to_string(), Value::String("none".to_string()));
-    package.insert("description".to_string(), Value::String("".to_string()));
-    package.insert("author".to_string(), Value::String("".to_string()));
-    package.insert(
-        "license".to_string(),
-        Value::String("GPL-3.0-or-later".to_string()),
-    );
-
-    let mut build = Map::new();
-    build.insert(
-        "language".to_string(),
-        Value::String(DEFAULT_LANGUAGE.to_string()),
-    );
-    build.insert(
-        "standard".to_string(),
-        Value::String(DEFAULT_STANDARD.to_string()),
-    );
-    build.insert(
-        "compiler".to_string(),
-        Value::String(DEFAULT_COMPILER.to_string()),
-    );
-    build.insert("kind".to_string(), Value::String(DEFAULT_KIND.to_string()));
-
-    let mut root = Map::new();
-    root.insert("package".to_string(), Value::Table(package));
-    root.insert("build".to_string(), Value::Table(build));
-    root.insert("dependencies".to_string(), Value::Table(Map::new()));
-
-    Ok(Value::Table(root))
+    format!(
+        "[package]\n\
+         name = \"{name}\"\n\
+         version = \"{DEFAULT_VERSION}\"\n\
+         type = \"none\"\n\
+         description = \"\"\n\
+         author = \"\"\n\
+         license = \"GPL-3.0-or-later\"\n\
+         \n\
+         [build]\n\
+         language = \"{DEFAULT_LANGUAGE}\"\n\
+         standard = \"{DEFAULT_STANDARD}\"\n\
+         compiler = \"{DEFAULT_COMPILER}\"\n\
+         kind = \"{DEFAULT_KIND}\"\n\
+         \n\
+         [dependencies]\n"
+    )
 }

-fn format_toml(value: &Value) -> Result<String, ConfigError> {
-    let root = value
-        .as_table()
-        .ok_or_else(|| ConfigError::Invalid("root is not a table".into()))?;
-
-    let package = root
-        .get("package")
-        .and_then(|v| v.as_table())
-        .ok_or_else(|| ConfigError::Invalid("missing [package]".into()))?;
-    let build = root
-        .get("build")
-        .and_then(|v| v.as_table())
-        .ok_or_else(|| ConfigError::Invalid("missing [build]".into()))?;
-    let deps = root
-        .get("dependencies")
-        .and_then(|v| v.as_table())
-        .ok_or_else(|| ConfigError::Invalid("missing [dependencies]".into()))?;
-    let toolchain = root.get("toolchain").and_then(|v| v.as_table());
-
-    let name = package.get("name").and_then(|v| v.as_str()).unwrap_or("");
-    let version = package
-        .get("version")
-        .and_then(|v| v.as_str())
-        .unwrap_or("");
-
-    let language_value = build.get("language");
-    let language = match language_value {
-        Some(Value::String(s)) => s.to_string(),
-        Some(Value::Array(arr)) => format_string_array(&Value::Array(arr.clone())),
-        _ => "".to_string(),
-    };
-    let standard = build.get("standard").and_then(|v| v.as_str()).unwrap_or("");
-    let compiler = build.get("compiler").and_then(|v| v.as_str()).unwrap_or("");
-
-    let mut out = String::new();
-    out.push_str("[package]\n");
-    out.push_str(&format!("name = \"{name}\"\n"));
-    out.push_str(&format!("version = \"{version}\"\n"));
-
-    for key in [
-        "type",
-        "description",
-        "author",
-        "authors",
-        "homepage",
-        "license",
-        "repository",
-        "readme",
-        "keywords",
-        "categories",
-    ] {
-        if let Some(val) = package.get(key) {
-            match val {
-                Value::String(s) => out.push_str(&format!("{key} = \"{s}\"\n")),
-                Value::Array(_) => out.push_str(&format!("{key} = {}\n", format_string_array(val))),
-                _ => {}
+fn set_doc_path(doc: &mut DocumentMut, path: &[&str], value: &Value) -> Result<(), ConfigError> {
+    let mut current = doc.as_table_mut();
+    for &key in &path[..path.len().saturating_sub(1)] {
+        if !current.contains_key(key) {
+            current.insert(key, Item::Table(Table::new()));
        }
+        current = current
+            .get_mut(key)
+            .and_then(|item| item.as_table_mut())
+            .ok_or_else(|| ConfigError::Invalid(format!("'{key}' is not a table")))?;
    }
-    }
-    out.push('\n');

-    out.push_str("[build]\n");
-    if language.starts_with('[') {
-        out.push_str(&format!("language = {language}\n"));
+    if let Some(&last) = path.last() {
+        current.insert(last, value_to_item(value));
+        Ok(())
    } else {
-        out.push_str(&format!("language = \"{language}\"\n"));
-    }
-    if !standard.is_empty() {
-        out.push_str(&format!("standard = \"{standard}\"\n"));
-    }
-    out.push_str(&format!("compiler = \"{compiler}\"\n"));
-    let kind = build
-        .get("kind")
-        .and_then(|v| v.as_str())
-        .unwrap_or(DEFAULT_KIND);
-    out.push_str(&format!("kind = \"{kind}\"\n"));
-    if let Some(target) = build.get("target").and_then(|v| v.as_str())
-        && !target.trim().is_empty()
-    {
-        out.push_str(&format!("target = \"{target}\"\n"));
-    }
-    if let Some(out_dir) = build.get("out_dir").and_then(|v| v.as_str())
-        && !out_dir.trim().is_empty()
-    {
-        out.push_str(&format!("out_dir = \"{out_dir}\"\n"));
-    }
-    if let Some(cflags) = build.get("cflags") {
-        out.push_str(&format!("cflags = {}\n", format_string_array(cflags)));
-    }
-    if let Some(ldflags) = build.get("ldflags") {
-        out.push_str(&format!("ldflags = {}\n", format_string_array(ldflags)));
-    }
-    out.push('\n');
-
-    if let Some(toolchain) = toolchain {
-        let mut lines = Vec::new();
-        for key in ["cc", "cxx", "as", "ar", "ld"] {
-            if let Some(value) = toolchain.get(key).and_then(|v| v.as_str())
-                && !value.trim().is_empty()
-            {
-                lines.push(format!("{key} = \"{value}\""));
-            }
-        }
-        if !lines.is_empty() {
-            out.push_str("[toolchain]\n");
-            for line in lines {
-                out.push_str(&format!("{line}\n"));
-            }
-            out.push('\n');
+        Err(ConfigError::Invalid("empty key".into()))
    }
 }

-    out.push_str("[dependencies]\n");
-    if !deps.is_empty() {
-        let mut keys: Vec<&String> = deps.keys().collect();
-        keys.sort();
-        for key in keys {
-            if let Some(val) = deps.get(key) {
-                out.push_str(&format!("{key} = {}\n", format_dep_value(val)));
-            }
-        }
-    }
-    Ok(out)
+fn value_to_item(value: &Value) -> Item {
+    Item::Value(value_to_edit_value(value))
 }

-fn format_dep_value(value: &Value) -> String {
+fn value_to_edit_value(value: &Value) -> toml_edit::Value {
    match value {
-        Value::String(s) => format!("\"{s}\""),
+        Value::String(s) => toml_edit::Value::from(s.clone()),
+        Value::Integer(i) => toml_edit::Value::from(*i),
+        Value::Float(f) => toml_edit::Value::from(*f),
+        Value::Boolean(b) => toml_edit::Value::from(*b),
+        Value::Datetime(dt) => {
+            let s = dt.to_string();
+            s.parse::<toml_edit::Datetime>()
+                .map(toml_edit::Value::from)
+                .unwrap_or_else(|_| toml_edit::Value::from(s))
+        }
+        Value::Array(arr) => {
+            let mut out = toml_edit::Array::new();
+            for item in arr {
+                out.push(value_to_edit_value(item));
+            }
+            toml_edit::Value::Array(out)
+        }
        Value::Table(tbl) => {
-            let mut parts = Vec::new();
-            if let Some(v) = tbl.get("version").and_then(|v| v.as_str()) {
-                parts.push(format!("version = \"{v}\""));
+            let mut out = toml_edit::InlineTable::new();
+            for key in ordered_table_keys(tbl) {
+                if let Some(v) = tbl.get(&key) {
+                    out.insert(&key, value_to_edit_value(v));
                }
-            if let Some(v) = tbl.get("path").and_then(|v| v.as_str()) {
-                parts.push(format!("path = \"{v}\""));
            }
-            if let Some(v) = tbl.get("git").and_then(|v| v.as_str()) {
-                parts.push(format!("git = \"{v}\""));
+            toml_edit::Value::InlineTable(out)
        }
-            if let Some(v) = tbl.get("branch").and_then(|v| v.as_str()) {
-                parts.push(format!("branch = \"{v}\""));
-            }
-            if let Some(v) = tbl.get("tag").and_then(|v| v.as_str()) {
-                parts.push(format!("tag = \"{v}\""));
-            }
-            if let Some(v) = tbl.get("rev").and_then(|v| v.as_str()) {
-                parts.push(format!("rev = \"{v}\""));
-            }
-            if let Some(v) = tbl.get("default-features").and_then(|v| v.as_bool()) {
-                parts.push(format!(
-                    "default-features = {}",
-                    if v { "true" } else { "false" }
-                ));
-            }
-            if let Some(v) = tbl.get("features") {
-                parts.push(format!("features = {}", format_string_array(v)));
-            }
-            if let Some(v) = tbl.get("system").and_then(|v| v.as_bool()) {
-                parts.push(format!("system = {}", if v { "true" } else { "false" }));
-            }
-            format!("{{ {} }}", parts.join(", "))
-        }
-        _ => "\"\"".to_string(),
    }
 }

-fn format_string_array(value: &Value) -> String {
-    if let Some(arr) = value.as_array() {
-        let items: Vec<String> = arr
+const DEP_KEY_ORDER: &[&str] = &[
+    "version",
+    "path",
+    "git",
+    "branch",
+    "tag",
+    "rev",
+    "default-features",
+    "features",
+    "system",
+];
+
+fn ordered_table_keys(tbl: &Map<String, Value>) -> Vec<String> {
+    let mut keys: Vec<String> = DEP_KEY_ORDER
        .iter()
-            .filter_map(|v| v.as_str().map(|s| format!("\"{s}\"")))
+        .filter(|k| tbl.contains_key(**k))
+        .map(|k| (*k).to_string())
        .collect();
-        return format!("[{}]", items.join(", "));
-    }
-    "[]".to_string()
+    let mut rest: Vec<String> = tbl
+        .keys()
+        .filter(|k| !DEP_KEY_ORDER.contains(&k.as_str()))
+        .cloned()
+        .collect();
+    rest.sort();
+    keys.extend(rest);
+    keys
 }

 fn get_path<'a>(value: &'a Value, path: &[&str]) -> Option<&'a Value> {
@@ -1135,6 +1092,84 @@ mod tests {
        );
    }

+    #[test]
+    fn save_preserves_untyped_sections() {
+        let dir = temp_dir("preserve_untyped");
+        let path = write_toml_file(
+            &dir,
+            "# top comment\n\
+             [package]\n\
+             name = \"test\"\n\
+             version = \"0.1.0\"\n\n\
+             [build]\n\
+             language = \"c\"\n\
+             standard = \"c11\"\n\
+             compiler = \"clang\"\n\
+             kind = \"elf\"\n\
+             filename = \"KERNEL\"\n\
+             extension = \"ELF\"\n\
+             inherit = false\n\
+             include = [\"src/include\"]\n\n\
+             [[build.post_steps]]\n\
+             name = \"iso\"\n\
+             cmd = \"grub-mkrescue\"\n\n\
+             [run]\n\
+             cmd = \"qemu-system-aarch64 -kernel KERNEL\"\n\n\
+             [dependencies]\n",
+        );
+
+        let mut config = Config::open(&path.to_string_lossy()).unwrap();
+        config
+            .set("dependencies.zlib", {
+                let mut tbl = Map::new();
+                tbl.insert("path".to_string(), Value::String("../zlib".to_string()));
+                Value::Table(tbl)
+            })
+            .unwrap();
+
+        // Reload from disk and confirm nothing modeled-but-not-whitelisted was dropped.
+        let reloaded = Config::open(&path.to_string_lossy()).unwrap();
+        assert_eq!(
+            reloaded.get("build.filename").and_then(|v| v.as_str()),
+            Some("KERNEL"),
+            "build.filename must survive save"
+        );
+        assert_eq!(
+            reloaded.get("build.extension").and_then(|v| v.as_str()),
+            Some("ELF")
+        );
+        assert_eq!(
+            reloaded.get("build.inherit").and_then(|v| v.as_bool()),
+            Some(false)
+        );
+        assert!(
+            reloaded
+                .get("build.include")
+                .and_then(|v| v.as_array())
+                .is_some(),
+            "build.include array must survive save"
+        );
+        assert_eq!(
+            reloaded.get("run.cmd").and_then(|v| v.as_str()),
+            Some("qemu-system-aarch64 -kernel KERNEL"),
+            "[run] section must survive save"
+        );
+        assert!(
+            reloaded.get("build.post_steps").is_some(),
+            "[[build.post_steps]] must survive save"
+        );
+
+        let saved = fs::read_to_string(&path).unwrap();
+        assert!(
+            saved.contains("zlib = { path = \"../zlib\" }"),
+            "dependency must be an inline table, got:\n{saved}"
+        );
+        assert!(
+            saved.contains("# top comment"),
+            "leading comment must be preserved, got:\n{saved}"
+        );
+    }
+
    #[test]
    fn new_creates_default_config() {
        let dir = temp_dir("new_default");
--- a/src/core/builder/asm.rs
+++ b/src/core/builder/asm.rs
@@ -1,170 +0,0 @@
-use crate::core::builder::BuildContext;
-use crate::core::builder::common;
-use crate::platform;
-use std::path::Path;
-use std::process::Command;
-use std::time::Instant;
-
-pub fn build_assembly<F>(
-    ctx: &BuildContext,
-    backend_name: &str,
-    default_assembler: &str,
-    extensions: &[&str],
-    build_object: F,
-) -> Result<f64, String>
-where
-    F: Fn(&str, &str, &str, &BuildContext) -> Result<(), String> + Sync,
-{
-    let lang = ctx.language.to_lowercase();
-    if lang.split(',').any(|p| p.trim() != "asm") {
-        return Err(format!(
-            "{backend_name} backend requires build.language = \"asm\""
-        ));
-    }
-
-    let assembler = if ctx.compiler.is_empty() {
-        default_assembler
-    } else {
-        ctx.compiler
-    };
-
-    let start_time = Instant::now();
-    let sources = common::collect_sources(
-        ctx.source_roots,
-        extensions,
-        ctx.exclude_dirs,
-        ctx.include_paths,
-    )?;
-    let obj_dir = match ctx.target_dir {
-        Some(dir) => Path::new(dir).join("obj"),
-        None => Path::new("./target").join(ctx.profile).join("obj"),
-    };
-    let objects = build_objects_common(assembler, &sources, &obj_dir, ctx, &build_object)?;
-
-    if ctx.kind == "staticlib" {
-        return archive_staticlib(ctx, &objects, start_time);
-    }
-
-    link_objects(ctx, &objects, start_time)
-}
-
-fn build_objects_common<F>(
-    assembler: &str,
-    sources: &[String],
-    obj_dir: &Path,
-    ctx: &BuildContext,
-    build_object: &F,
-) -> Result<Vec<String>, String>
-where
-    F: Fn(&str, &str, &str, &BuildContext) -> Result<(), String> + Sync,
-{
-    let objects: Vec<String> = sources
-        .iter()
-        .map(|s| common::object_path(obj_dir, s, "o"))
-        .collect();
-
-    common::parallel_build(
-        sources.len(),
-        |i| build_object(assembler, &sources[i], &objects[i], ctx),
-        ctx.codegen_units,
-    )?;
-
-    Ok(objects)
-}
-
-fn archive_staticlib(
-    ctx: &BuildContext,
-    objects: &[String],
-    start_time: Instant,
-) -> Result<f64, String> {
-    let lib_path = platform::lib_path(ctx.profile, ctx.project_name, ctx.target_dir);
-    if !common::needs_link(objects, &lib_path) {
-        return Ok(common::elapsed_secs(start_time));
-    }
-
-    let archiver = ctx.archiver.unwrap_or(if cfg!(target_os = "windows") {
-        "lib"
-    } else {
-        "ar"
-    });
-
-    let mut cmd = Command::new(archiver);
-    if cfg!(target_os = "windows") && archiver == "lib" {
-        cmd.arg("/nologo").arg(format!("/OUT:{lib_path}"));
-    } else {
-        cmd.arg("rcs").arg(&lib_path);
-    }
-    for obj in objects {
-        cmd.arg(obj);
-    }
-
-    if ctx.verbose || std::env::var("DCR_DEBUG").is_ok() {
-        eprintln!("[dcr] {:?}", cmd);
-    }
-
-    match cmd.status() {
-        Ok(status) if status.success() => Ok(common::elapsed_secs(start_time)),
-        Ok(_) => Err("Build failed".to_string()),
-        Err(err) => Err(format!("Build failed: {err}")),
-    }
-}
-
-fn link_objects(
-    ctx: &BuildContext,
-    objects: &[String],
-    start_time: Instant,
-) -> Result<f64, String> {
-    let mut cmd = Command::new(ctx.linker.unwrap_or("cc"));
-    if ctx.kind == "sharedlib" {
-        if cfg!(target_os = "macos") {
-            cmd.arg("-dynamiclib");
-        } else {
-            cmd.arg("-shared");
-        }
-    }
-
-    for obj in objects {
-        cmd.arg(obj);
-    }
-    for dir in ctx.lib_dirs {
-        cmd.arg(format!("-L{dir}"));
-    }
-    for lib in ctx.libs {
-        cmd.arg(format!("-l{lib}"));
-    }
-    for flag in ctx.ldflags {
-        cmd.arg(flag);
-    }
-
-    let name = ctx.output_filename.unwrap_or(ctx.project_name);
-    let ext = ctx.output_extension.unwrap_or("");
-    let final_name = if ext.is_empty() {
-        name.to_string()
-    } else {
-        format!("{}.{}", name, ext)
-    };
-
-    let out_path = if ctx.kind == "sharedlib" {
-        platform::shared_lib_path(ctx.profile, &final_name, ctx.target_dir)
-    } else if ctx.kind == "elf" {
-        platform::elf_path(ctx.profile, &final_name, ctx.target_dir)
-    } else {
-        platform::bin_path(ctx.profile, &final_name, ctx.target_dir)
-    };
-
-    if !common::needs_link(objects, &out_path) {
-        return Ok(common::elapsed_secs(start_time));
-    }
-
-    cmd.arg("-o").arg(out_path);
-
-    if ctx.verbose || std::env::var("DCR_DEBUG").is_ok() {
-        eprintln!("[dcr] {:?}", cmd);
-    }
-
-    match cmd.status() {
-        Ok(status) if status.success() => Ok(common::elapsed_secs(start_time)),
-        Ok(_) => Err("Build failed".to_string()),
-        Err(err) => Err(format!("Build failed: {err}")),
-    }
-}
--- a/src/core/builder/mod.rs
+++ b/src/core/builder/mod.rs
@@ -1,124 +0,0 @@
-// DCR — Cargo-like C/C++ project manager.
-//
-// Copyright (C) 2026 Dexoron (Bezotechestvo Vladimir) <main@dexoron.su>
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-pub mod asm;
-pub mod common;
-pub mod fasm;
-pub mod gas;
-pub mod llvm_ir;
-pub mod masm;
-pub mod msvc;
-pub mod nasm;
-pub mod qt;
-pub mod unix_cc;
-
-pub struct BuildContext<'a> {
-    pub profile: &'a str,
-    pub project_name: &'a str,
-    pub compiler: &'a str,
-    pub language: &'a str,
-    pub standard: &'a str,
-    pub cxx_standard: &'a str,
-    pub target: Option<&'a str>,
-    pub target_dir: Option<&'a str>,
-    pub kind: &'a str,
-    pub platform: Option<&'a str>,
-    pub linker: Option<&'a str>,
-    pub archiver: Option<&'a str>,
-    pub moc: Option<&'a str>,
-    pub uic: Option<&'a str>,
-    pub rcc: Option<&'a str>,
-    pub package_type: Option<&'a str>,
-    pub freestanding: bool,
-    pub panic_abort: bool,
-    pub codegen_units: usize,
-    pub source_roots: &'a [std::path::PathBuf],
-    pub exclude_dirs: &'a [std::path::PathBuf],
-    pub include_paths: &'a [String],
-    pub include_dirs: &'a [String],
-    pub lib_dirs: &'a [String],
-    pub libs: &'a [String],
-    pub cflags: &'a [String],
-    pub ldflags: &'a [String],
-    pub output_filename: Option<&'a str>,
-    pub output_extension: Option<&'a str>,
-    pub verbose: bool,
-    pub qt: bool,
-}
-
-pub fn build(ctx: &BuildContext) -> Result<f64, String> {
-    let compiler = ctx.compiler.to_lowercase();
-    if !check_compiler_exists(ctx.compiler) {
-        return Err(format!(
-            "Compiler not found: {}. Make sure it is installed and available in PATH.",
-            ctx.compiler
-        ));
-    }
-    if compiler.contains("clang-cl") {
-        return msvc::build(ctx);
-    }
-    if compiler == "as" || compiler.contains("gas") {
-        return gas::build(ctx);
-    }
-    if compiler.contains("llc") {
-        return llvm_ir::build(ctx);
-    }
-    if compiler.contains("fasm") {
-        return fasm::build(ctx);
-    }
-    if compiler.contains("nasm") {
-        return nasm::build(ctx);
-    }
-    if compiler == "ml" || compiler == "ml64" || compiler.contains("masm") {
-        return masm::build(ctx);
-    }
-    if compiler == "cl" || compiler.contains("msvc") {
-        return msvc::build(ctx);
-    }
-    unix_cc::build(ctx)
-}
-
-fn check_compiler_exists(compiler: &str) -> bool {
-    let name = if compiler.is_empty() { "cc" } else { compiler };
-    std::process::Command::new(name)
-        .arg("--version")
-        .output()
-        .is_ok()
-}
-
-pub fn collect_sources(ctx: &BuildContext) -> Result<Vec<String>, String> {
-    let compiler = ctx.compiler.to_lowercase();
-    if compiler.contains("clang-cl") || compiler == "cl" || compiler.contains("msvc") {
-        return msvc::collect_sources(ctx);
-    }
-    if compiler == "as" || compiler.contains("gas") {
-        return gas::collect_sources(ctx);
-    }
-    if compiler.contains("llc") {
-        return llvm_ir::collect_sources(ctx);
-    }
-    if compiler.contains("fasm") {
-        return fasm::collect_sources(ctx);
-    }
-    if compiler.contains("nasm") {
-        return nasm::collect_sources(ctx);
-    }
-    if compiler == "ml" || compiler == "ml64" || compiler.contains("masm") {
-        return masm::collect_sources(ctx);
-    }
-    unix_cc::collect_sources(ctx)
-}
--- a/src/core/deps/mod.rs
+++ b/src/core/deps/mod.rs
@@ -103,6 +103,10 @@ pub fn resolve_deps(
                        }
                    } else {
                        push_if_exists(&mut resolved.include_dirs, &dep_root.join("include"));
+                        push_if_exists(
+                            &mut resolved.include_dirs,
+                            &dep_root.join("target").join("include"),
+                        );
                    }

                    if let Some(lib_dirs) = table.get("lib").and_then(|v| v.as_array()) {
@@ -128,6 +132,10 @@ pub fn resolve_deps(
                    }
                } else {
                    push_if_exists(&mut resolved.include_dirs, &dep_root.join("include"));
+                    push_if_exists(
+                        &mut resolved.include_dirs,
+                        &dep_root.join("target").join("include"),
+                    );
                    push_default_lib_dirs(&mut resolved.lib_dirs, &dep_root);
                    resolved.libs.push(name.clone());
                }
--- a/src/core/mod.rs
+++ b/src/core/mod.rs
@@ -15,8 +15,8 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.

+pub mod build;
 pub mod build_config;
-pub mod builder;
 pub mod deps;
 pub mod registry;
 pub mod runner;
--- a/src/core/workspace.rs
+++ b/src/core/workspace.rs
@@ -50,7 +50,6 @@ pub fn parse_workspace(
    root: &Path,
 ) -> Result<Option<Workspace>, String> {
    let mut table = None;
-    // Order: workspace.target.profile, workspace.profile.target, workspace.target, workspace.profile, workspace
    let combinations = if let Some(t) = target {
        let normalized_t = normalize_target_os(t);
        vec![
--- a/src/utils/build.rs
+++ b/src/utils/build.rs
@@ -86,6 +86,14 @@ pub fn normalize_kind(kind: &str) -> &str {
    if trimmed.is_empty() { "bin" } else { trimmed }
 }

+pub fn is_flat_bin(kind: &str) -> bool {
+    kind == "flat-bin"
+}
+
+pub fn is_compile_only(kind: &str) -> bool {
+    matches!(kind, "none" | "custom" | "flat-bin")
+}
+
 pub fn normalize_platform(platform: &str) -> Option<&str> {
    let trimmed = platform.trim();
    if trimmed.is_empty() {
@@ -280,7 +288,7 @@ pub fn get_language_with_profile(config: &Config, profile: &str) -> Result<Strin
    }
    match config.get("build.language") {
        Some(v) => parse_language_value(v, "build.language"),
-        None => Err("build.language is missing".to_string()),
+        None => Ok("c".to_string()),
    }
 }

@@ -324,9 +332,14 @@ pub fn resolve_compiler(
    tc_as: Option<&str>,
 ) -> String {
    let lang = primary_language(language);
-    env_override_compiler(&lang)
+    let result = env_override_compiler(&lang)
        .or_else(|| toolchain_override_compiler(&lang, tc_cc, tc_cxx, tc_as))
-        .unwrap_or_else(|| compiler.to_string())
+        .unwrap_or_else(|| compiler.to_string());
+    if lang == "asm" {
+        map_asm_compiler(&result)
+    } else {
+        result
+    }
 }

 fn env_override_compiler(lang: &str) -> Option<String> {
@@ -369,7 +382,8 @@ fn toolchain_override_compiler(
    tc_as: Option<&str>,
 ) -> Option<String> {
    if lang == "asm" {
-        return tc_as.map(|v| v.to_string());
+        let as_compiler = tc_as.map(|v| v.to_string());
+        return as_compiler.map(|v| map_asm_compiler(&v));
    }
    if (lang == "c++" || lang == "cpp" || lang == "cxx")
        && let Some(v) = tc_cxx
@@ -379,23 +393,31 @@ fn toolchain_override_compiler(
    tc_cc.map(|v| v.to_string())
 }

+fn map_asm_compiler(compiler: &str) -> String {
+    match compiler.to_lowercase().as_str() {
+        "gas" | "gnu-as" => "as".to_string(),
+        "nasm" => "nasm".to_string(),
+        "fasm" | "fasm64" => "fasm".to_string(),
+        "masm" | "ml" | "ml64" => "ml".to_string(),
+        _ => compiler.to_string(),
+    }
+}
+
 pub fn primary_language(language: &str) -> String {
-    let parts: Vec<String> = language
+    let tokens: Vec<&str> = language
        .split(',')
-        .map(|p| p.trim().to_lowercase())
-        .filter(|p| !p.is_empty())
+        .map(|s| s.trim())
+        .filter(|s| !s.is_empty())
        .collect();
-    for p in &parts {
-        if p == "c++" || p == "cpp" || p == "cxx" {
-            return p.clone();
+    // Priority: c++ > c > asm.
+    for id in ["cxx", "c", "asm"] {
+        let hit = tokens.iter().any(|t| {
+            crate::core::build::language::language_for_token(t).map(|l| l.id()) == Some(id)
+        });
+        if hit {
+            return id.to_string();
        }
    }
-    if parts.iter().any(|p| p == "c") {
-        return "c".to_string();
-    }
-    if parts.iter().any(|p| p == "asm") {
-        return "asm".to_string();
-    }
    language.to_lowercase()
 }

--- a/tests/cli_build.rs
+++ b/tests/cli_build.rs
@@ -16,6 +16,48 @@ fn init_and_clean_remove_target() {
    assert!(!dir.join("target").exists(), "target should be removed");
 }

+#[test]
+fn add_preserves_run_and_untyped_keys() {
+    // Regression: `dcr add` used to drop the [run] section and non-whitelisted
+    // [build] keys (filename/extension/include) when re-serializing dcr.toml.
+    let dir = unique_sandbox_dir("preserve_add");
+    let out = run_dcr(&["init"], &dir);
+    assert!(out.status.success(), "dcr init should succeed");
+
+    let toml_path = dir.join("dcr.toml");
+    let toml = std::fs::read_to_string(&toml_path).expect("failed to read dcr.toml");
+    let updated = toml.replace(
+        "[build]",
+        "[build]\nfilename = \"KERNEL\"\nextension = \"ELF\"\ninclude = [\"src/include\"]",
+    ) + "\n[run]\ncmd = \"qemu-system-aarch64 -kernel KERNEL\"\n";
+    std::fs::write(&toml_path, updated).expect("failed to write dcr.toml");
+
+    let out = run_dcr(&["add", "zlib", "path:../zlib"], &dir);
+    assert!(out.status.success(), "dcr add should succeed");
+
+    let saved = std::fs::read_to_string(&toml_path).expect("failed to read dcr.toml");
+    assert!(
+        saved.contains("filename = \"KERNEL\""),
+        "build.filename lost:\n{saved}"
+    );
+    assert!(
+        saved.contains("extension = \"ELF\""),
+        "build.extension lost:\n{saved}"
+    );
+    assert!(
+        saved.contains("include = [\"src/include\"]"),
+        "build.include lost:\n{saved}"
+    );
+    assert!(
+        saved.contains("[run]") && saved.contains("qemu-system-aarch64"),
+        "[run] section lost:\n{saved}"
+    );
+    assert!(
+        saved.contains("zlib = { path = \"../zlib\" }"),
+        "dependency not added as inline table:\n{saved}"
+    );
+}
+
 #[test]
 fn build_run_clean_flags_normal_project() {
    let Some(compiler) = available_compiler() else {
Author	SHA1	Message	Date
Dexoron	689fea7465	Merge pull request #28 from dexoron/dev v0.8.1	2026-07-21 18:12:56 +08:00
Dexoron	a9dd8c1631	feat(build): add flat-bin kind and FAT [archive] packing for OS-dev	2026-07-21 17:45:02 +08:00
Dexoron	9d030cba0c	fix(build): skip linking/archiving for custom and none project kinds	2026-07-18 20:21:41 +08:00
Dexoron	1dcc8e614a	Merge pull request #25 from dexoron/dev v0.8.0	2026-07-18 20:05:12 +08:00
Dexoron	9eaa4635d5	refactor: modularize build core engine, update workspaces, cache, and test suite	2026-07-18 20:02:12 +08:00
Dexoron	a3f8444c20	Replace GitLab pipeline trigger with Cloudflare build	2026-07-05 18:24:47 +08:00
Dexoron	1f3fc62cb6	Add GitHub Actions workflow to trigger site rebuild	2026-07-05 18:16:45 +08:00