add new and init to toolchain

compiler/backend/backend.odin

@@ -13,6 +13,32 @@ append_owned :: proc(command: ^[dynamic]string, value: string, allocator: mem.Al
 	append(command, strings.clone(value, allocator))
 }
 
+macos_sdk_root :: proc(allocator := context.allocator) -> (string, bool) {
+	candidates := []string{
+		"/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk",
+		"/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk",
+	}
+	for path in candidates {
+		if os.exists(path) {
+			return strings.clone(path, allocator), true
+		}
+	}
+	return "", false
+}
+
+append_macos_sdk_paths :: proc(command: ^[dynamic]string, selected: target.Target, allocator: mem.Allocator) {
+	if selected.kind != .Aarch64_Macos {
+		return
+	}
+	sdk, ok := macos_sdk_root(allocator)
+	if !ok {
+		return
+	}
+	defer delete(sdk, allocator)
+	append(command, fmt.aprintf("-F%s/System/Library/Frameworks", sdk, allocator=allocator))
+	append(command, fmt.aprintf("-L%s/usr/lib", sdk, allocator=allocator))
+}
+
 build_command :: proc(
 	llvm_path, output_path: string,
 	link_arguments: []linker.Argument,
@@ -29,6 +55,7 @@ build_command :: proc(
 	append_owned(&command, target.name(selected), allocator)
 	append_owned(&command, "-Wno-override-module", allocator)
 	append_owned(&command, "-Wno-unused-command-line-argument", allocator)
+	append_macos_sdk_paths(&command, selected, allocator)
 	append_owned(&command, llvm_path, allocator)
 	for path in c_options.include_paths {
 		append(&command, fmt.aprintf("-I%s", path, allocator=allocator))