From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samuel Maddock <smaddock@slack-corp.com>
Date: Wed, 8 Oct 2025 10:50:03 -0400
Subject: fix: redefined macos sdk header symbols

https://chromium-review.googlesource.com/c/chromium/src/+/6950738

Chromium has set the minimum MacOS SDK version to 26. With this
change, it seems to introduce an incompatibility when compiling
using clang modules. Disabling them resolves the issue.

diff --git a/unofficial.gni b/unofficial.gni
index a64d2e4ac475abc049fff7ea62ec76de565a747d..ab456452d102088005fc4bfcb394d2de5ec44889 100644
--- a/unofficial.gni
+++ b/unofficial.gni
@@ -195,6 +195,10 @@ template("node_gn_build") {
         "CoreFoundation.framework",
         "Security.framework",
       ]
+
+      # Fix for MacOSX26 SDK headers included twice due to usage of clang
+      # modules. Included once as a C header and again as C++.
+      use_libcxx_modules = false
     }
     if (is_posix) {
       configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
@@ -350,6 +354,12 @@ template("node_gn_build") {
     include_dirs = [ "src", "tools" ]
     configs += [ "//build/config/compiler:no_exit_time_destructors" ]
 
+    # Fix for MacOSX26 SDK headers included twice due to usage of clang modules.
+    # Included once as a C header and again as C++.
+    if (is_mac) {
+      use_libcxx_modules = false
+    }
+
     if (!is_win) {
       defines += [ "NODE_JS2C_USE_STRING_LITERALS" ]
     }