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Dexoron
617ba85442
- Toolchain overrides via `[toolchain]` and env (`DCR_*`) - ASM `.S` preprocessing via GCC/Clang (`-x assembler-with-cpp`)
72 lines
2.1 KiB
Markdown
72 lines
2.1 KiB
Markdown
# Compilers & linking
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## Compiler backend selection
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DCR picks a backend from `build.compiler`:
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- contains `clang-cl` -> MSVC backend
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- equals `as` or contains `gas` -> GAS backend (standalone assembler)
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- contains `gcc` or `g++` -> GCC backend
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- contains `clang` or `clang++` -> Clang backend
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- equals `cl` or contains `msvc` -> MSVC backend
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- contains `nasm` -> NASM backend
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- otherwise -> Clang backend fallback
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## Compilation model
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- Source files are found recursively in `src/` based on `build.language`.
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- Each source is compiled to `target/<profile>/obj/<relative-path>.o` (`.obj` on MSVC).
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- Recompile happens when source mtime is newer than object mtime.
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## Default build flags
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These flags are applied automatically based on profile and compiler backend.
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GCC/Clang:
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- `debug`: `-O0 -g -Wall -Wextra -fno-omit-frame-pointer -DDEBUG`
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- `release`: `-O3 -DNDEBUG -march=native`
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MSVC:
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- `debug`: `/Od /Zi /W4 /DDEBUG /Oy-`
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- `release`: `/O2 /DNDEBUG`
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## Platform hint
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If `build.platform` is set, DCR passes it as an architecture hint:
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- GCC/Clang: `-march=<platform>`
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- MSVC: maps to `/arch:*` for known values (`x86`, `i386`, `i486`, `i586`, `i686`, `sse2`, `avx`, `avx2`)
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## Toolchain overrides
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If `[toolchain]` is set, DCR uses its values to override compiler/linker tools:
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- `cc`, `cxx`, `as` override compilers for C/C++/ASM
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- `ar` overrides the archiver (used for `staticlib`)
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- `ld` overrides the linker (used by GCC/Clang/NASM/GAS backends)
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Environment overrides (highest priority):
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- `DCR_COMPILER` (all languages)
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- `DCR_CC`, `DCR_CXX`, `DCR_AS`, `DCR_AR`, `DCR_LD`
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## Linking
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For `kind = "bin"`:
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- Object files are linked into executable artifact.
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- Dependency lib dirs and library names are passed to linker.
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- `build.ldflags` are appended to link command.
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For `kind = "staticlib"`:
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- Linux/macOS (GCC/Clang): `ar rcs` creates `.a` archive.
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- Windows (MSVC): `lib` creates `.lib` archive.
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For `kind = "sharedlib"`:
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- Linux (GCC/Clang): `-shared` with output `.so`.
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- macOS (Clang): `-dynamiclib` with output `.dylib`.
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- Windows (MSVC): `/LD` with output `.dll`.
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