macho: speed up the linker by embracing multi-threaded approach

.github/workflows/main.yml

@@ -34,17 +34,6 @@ jobs:
     - run: zig fmt --check src 
     - run: zig build test -Dhas-zig
 
-  macos_11:
-    name: Test macos 11.0
-    runs-on: macos-11
-    steps:
-    - uses: actions/checkout@v3
-    - uses: goto-bus-stop/setup-zig@v2
-      with:
-        version: master
-    - run: zig version
-    - run: zig build test -Dhas-static -Dhas-zig
-
   gcc_musl:
     name: Test gcc with musl
     runs-on: ubuntu-latest

build.zig

@@ -19,6 +19,8 @@ pub fn build(b: *std.Build) void {
     };
     const use_llvm = b.option(bool, "use-llvm", "Whether to use LLVM") orelse true;
     const use_lld = if (builtin.os.tag == .macos) false else use_llvm;
+    const sanitize_thread = b.option(bool, "sanitize-thread", "Enable thread-sanitization") orelse false;
+    const single_threaded = b.option(bool, "single-threaded", "Force single-threaded") orelse false;
 
     const yaml = b.dependency("zig-yaml", .{
         .target = target,
@@ -36,6 +38,8 @@ pub fn build(b: *std.Build) void {
         .optimize = mode,
         .use_llvm = use_llvm,
         .use_lld = use_lld,
+        .sanitize_thread = sanitize_thread,
+        .single_threaded = single_threaded,
     });
     exe.root_module.addImport("yaml", yaml.module("yaml"));
     exe.root_module.addImport("dis_x86_64", dis_x86_64.module("dis_x86_64"));
@@ -91,6 +95,8 @@ pub fn build(b: *std.Build) void {
         .optimize = mode,
         .use_llvm = use_llvm,
         .use_lld = use_lld,
+        .sanitize_thread = sanitize_thread,
+        .single_threaded = single_threaded,
     });
     const unit_tests_opts = b.addOptions();
     unit_tests.root_module.addOptions("build_options", unit_tests_opts);