CLI: allow using --debug-compile-errors with zig build

src/main.zig

@@ -3778,6 +3778,7 @@ pub fn cmdBuild(gpa: Allocator, arena: Allocator, args: []const []const u8) !voi
         var override_local_cache_dir: ?[]const u8 = try optionalStringEnvVar(arena, "ZIG_LOCAL_CACHE_DIR");
         var child_argv = std.ArrayList([]const u8).init(arena);
         var reference_trace: ?u32 = null;
+        var debug_compile_errors = false;
 
         const argv_index_exe = child_argv.items.len;
         _ = try child_argv.addOne();
@@ -3839,6 +3840,9 @@ pub fn cmdBuild(gpa: Allocator, arena: Allocator, args: []const []const u8) !voi
                     } else if (mem.eql(u8, arg, "-fno-reference-trace")) {
                         try child_argv.append(arg);
                         reference_trace = null;
+                    } else if (mem.eql(u8, arg, "--debug-compile-errors")) {
+                        try child_argv.append(arg);
+                        debug_compile_errors = true;
                     }
                 }
                 try child_argv.append(arg);
@@ -3973,6 +3977,7 @@ pub fn cmdBuild(gpa: Allocator, arena: Allocator, args: []const []const u8) !voi
             .use_stage1 = use_stage1,
             .cache_mode = .whole,
             .reference_trace = reference_trace,
+            .debug_compile_errors = debug_compile_errors,
         }) catch |err| {
             fatal("unable to create compilation: {s}", .{@errorName(err)});
         };