Added:

- `build.kind = "efi"` — UEFI PE32+ executable support. Links with `-shared -nostdlib -Wl,-dll -Wl,--subsystem,10`, output via `efi_path()` with `.efi` extension, rejected by `dcr run`.
- `build.kind = "elf"` — bare-metal ELF executable support. Uses `elf_path()` output path, rejected by `dcr run`, no extra linker flags.

Fixed:

- `dcr run` with `--target` or `build.target` now correctly finds the binary in the arch-specific target directory.
- `dcr run` checks profile-specific `build.{profile}.kind` before rejecting library builds (previously only checked `build.kind`).
- `dcr clean` now reads `build.target` from `dcr.toml` when no `--target` flag is given.
- Linux: target directory is now consistent — `target/<arch>-unknown-linux-gnu/<profile>/` (no stale `target/<profile>/`).
- `dcr.lock` is now populated with all resolved dependencies (registry, path, git) instead of being always empty.
- Git dependencies are now properly recognized and recorded in `dcr.lock`.
- `is_registry_dep` correctly identifies version-based registry dependency tables (`{ version = "..." }`) and rejects tables with unknown keys.
- `dcr test` accepts `--debug`/`--release` flags (defaults to `debug` profile instead of always `release`).
- Build fingerprint cache (`build_cache_path`) now includes `target_dir` — different targets no longer share a single cache entry.
- `object_path` no longer hardcodes the `src/` prefix — works correctly with custom `build.roots` (e.g. `roots = ["lib"]`).
- `dcr update` now generates `.exe` candidates for all Windows targets, not just `x86_64-pc-windows-msvc`.
- Compiler existence is verified before starting the build (clear error if compiler is not found in PATH).
- Consolidated duplicate `OUTPUT_MUTEX` definitions — MSVC backend now uses the shared mutex from `common.rs`.
- Registry cache root directory is created if missing (prevents cryptic errors when `~/.dcr/` does not exist).

src/cli/build.rs

@@ -355,9 +355,15 @@ fn ensure_target_dirs(items: &[String], profile: &str, target_dir: Option<String
     if let Some(dir) = &target_dir {
         let _ = fs::create_dir_all(dir);
     } else {
+        let default_dir = if cfg!(target_os = "linux") {
+            let arch = std::env::consts::ARCH;
+            format!("{arch}-unknown-linux-gnu/{profile}")
+        } else {
+            profile.to_string()
+        };
         let target_items = check_dir(Some("target")).unwrap_or_default();
-        if !target_items.contains(&profile.to_string()) {
-            let _ = fs::create_dir(format!("./target/{profile}"));
+        if !target_items.contains(&default_dir) {
+            let _ = fs::create_dir_all(format!("./target/{default_dir}"));
         }
     }
 }
@@ -1317,8 +1323,10 @@ fn write_build_fingerprint(ctx: &BuildContext, fingerprint: &str) -> Result<(),
 }
 
 fn build_cache_path(profile: &str, target_dir: Option<&str>) -> std::path::PathBuf {
-    let _ = target_dir;
-    Path::new("./target").join(profile).join(".dcr-build.hash")
+    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 {
@@ -1332,12 +1340,17 @@ fn build_output_path(ctx: &BuildContext) -> String {
     };
 
     if ctx.kind == "staticlib" {
-        // Для библиотек добавляем lib префикс если нужно, но упростим
         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)
 }