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+---
+sidebar_label: Build profiles
+---
+
+# Build Profiles
+
+Profiles allow overriding `[build]` fields for specific build modes.
+
+## Configuration
+
+```toml
+[build]
+language = "c"
+standard = "c17"
+cflags = ["-Wall"]
+
+[build.debug]
+cflags = ["-O0", "-g"]
+
+[build.release]
+cflags = ["-O3", "-DNDEBUG"]
+```
+
+## Merge rules
+
+Fields from `[build.\<profile>]` are merged on top of `[build]`:
+
+* **Scalar fields** (strings, numbers, bools) — replaced
+* **Arrays** (`cflags`, `ldflags`, ...) — **appended** (extend the `[build]` array)
+
+Set `inherit = false` to disable array inheritance (only profile's own arrays are used).
+
+## Built-in profiles
+
+The default flags for each profile are composed from three config fields:
+
+| Field       | debug default      | release default |
+| ----------- | ------------------ | --------------- |
+| `opt_level` | `"0"`              | `"3"`           |
+| `debug`     | `true`             | `false`         |
+| `warnings`  | `["all", "extra"]` | `[]`            |
+
+Which produce the equivalent compiler flags:
+
+| Profile   | Effective flags                                            |
+| --------- | ---------------------------------------------------------- |
+| `debug`   | `-O0 -g -Wall -Wextra -fno-omit-frame-pointer -DDCR_DEBUG` |
+| `release` | `-O3 -DNDEBUG`                                             |
+
+Additional build options can be toggled per-profile:
+
+```toml
+[build.release]
+opt_level = "z"
+lto = true
+strip = true
+panic = "abort"
+codegen-units = "1"
+
+[build.debug]
+opt_level = "1"
+debug = false
+warnings = ["all", "error"]
+```
+
+## Target-specific profiles
+
+```toml
+[build.linux]
+cflags = ["-DLINUX"]
+
+[build.windows.debug]
+cflags = ["-DWIN32", "-O0", "-g"]
+```
+
+Application order (highest priority first):
+
+1. `[build.\<target>.\<profile>]`
+2. `[build.\<profile>.\<target>]`
+3. `[build.\<target>]`
+4. `[build.\<profile>]`
+5. `[build]`