prefix: Move clang env to compiler option

mk/prefix.mk

@@ -406,7 +406,7 @@ else
 	@echo "\033[1;36;49mBuilding wasip1-libc-install\033[0m"
 	rm -rf "$@.partial" "$@"
 	export REDOXER_TOOLCHAIN=$(ROOT)/$(PREFIX)/clang-install $(PREFIX_CONFIG) PATH="$(ROOT)/$(PREFIX)/clang-install/bin:$$PATH" \
-		REDOXER_USE_CLANG=1 COOKBOOK_HOST_SYSROOT=/usr COOKBOOK_CROSS_TARGET=wasm32-wasip1 COOKBOOK_CROSS_GNU_TARGET=wasm32-wasip1 && \
+		COOKBOOK_HOST_SYSROOT=/usr COOKBOOK_CROSS_TARGET=wasm32-wasip1 COOKBOOK_CROSS_GNU_TARGET=wasm32-wasip1 && \
 		$(REPO_BIN) cook host:wasi-libc
 	cp -r "$(WASIP1_LIBC_TARGET)/stage/usr/". "$@.partial"
 	mkdir -p "$@.partial/share/wasi-sysroot"
@@ -453,7 +453,7 @@ else
 	echo "--sysroot=$(ROOT)/$(PREFIX)/gcc-install" > "$@.partial/bin/$(GNU_TARGET).cfg"
 	ln -s clang-21 "$@.partial/bin/$(GNU_TARGET)-clang"
 	export PATH="$(ROOT)/$@.partial/bin:$$PATH" $(PREFIX_CONFIG) \
-		COOKBOOK_HOST_SYSROOT=/usr COOKBOOK_CROSS_TARGET=$(HOST_TARGET) REDOXER_USE_CLANG=1 && \
+		COOKBOOK_HOST_SYSROOT=/usr COOKBOOK_CROSS_TARGET=$(HOST_TARGET) && \
 		$(REPO_BIN) cook llvm-rt21
 	cp -r "$(LLVM_RT_TARGET)/stage/usr/". "$@.partial"
 	echo "--sysroot=<CFGDIR>/../$(GNU_TARGET)" > "$@.partial/bin/$(GNU_TARGET).cfg"

recipes/core/relibc/recipe.toml

@@ -3,6 +3,7 @@ git = "https://gitlab.redox-os.org/redox-os/relibc.git"
 
 [build]
 template = "custom"
+compiler = "gcc-no-lto"
 script = """
 # rustup workaround https://github.com/rust-lang/rustup/issues/988
 if [ "${COOKBOOK_HOST_SYSROOT}" = "/usr" ]; then

recipes/dev/gcc13/recipe.toml

@@ -17,6 +17,7 @@ autotools_recursive_regenerate -I"$(realpath ./config)"
 
 [build]
 template = "custom"
+compiler = "gcc"
 dependencies = [
     "libgmp",
     "libmpfr",

recipes/dev/llvm-rt21/recipe.toml

@@ -3,6 +3,7 @@ same_as = "../llvm21"
 
 [build]
 template = "custom"
+compiler = "clang"
 script = """
 DYNAMIC_INIT
 

recipes/dev/rust/recipe.toml

@@ -5,6 +5,7 @@ shallow_clone = true
 
 [build]
 template = "custom"
+compiler = "gcc"
 dependencies = [
     "llvm21",
     "zlib",

recipes/dev/wasi-libc/recipe.toml

@@ -5,6 +5,7 @@ shallow_clone = true
 
 [build]
 template = "custom"
+compiler = "clang"
 script = """
 cookbook_cmake
 """