zld: disable LTO when targeting macOS

until we add linking of bitcode to the MachO backend.

Author: kubkon

src/Compilation.zig

@@ -900,7 +900,10 @@ pub fn create(gpa: *Allocator, options: InitOptions) !*Compilation {
         };
 
         const lto = blk: {
-            if (options.want_lto) |explicit| {
+            if (options.target.isDarwin()) {
+                // TODO ability of zig ld MachO backend to link bitcode files
+                break :blk false;
+            } else if (options.want_lto) |explicit| {
                 if (!use_lld)
                     return error.LtoUnavailableWithoutLld;
                 break :blk explicit;