From d8e42490b18bd0c8a827d96608e951bf5bc875e4 Mon Sep 17 00:00:00 2001
From: Violet Purcell <vimproved@inventati.org>
Date: Sun, 4 Jun 2023 04:56:58 -0400
Subject: [PATCH] Fix build with libc++ on linux

--- a/libs/vst3/pluginterfaces/base/funknown.cpp
+++ b/libs/vst3/pluginterfaces/base/funknown.cpp
@@ -44,7 +44,9 @@
 #endif
 
 #if SMTG_OS_LINUX
+#ifndef USE_LIBCXX
 #include <ext/atomicity.h>
+#endif
 /* UUID */
 #include <string>
 #include <boost/uuid/uuid.hpp>
@@ -83,7 +85,7 @@ int32 PLUGIN_API atomicAdd (int32& var, int32 d)
 	return InterlockedExchangeAdd ((volatile long int*)&var, d) + d;
 #elif SMTG_OS_MACOS
 	return OSAtomicAdd32Barrier (d, (int32_t*)&var);
-#elif SMTG_OS_LINUX
+#elif SMTG_OS_LINUX && !defined USE_LIBCXX
 	__gnu_cxx::__atomic_add (&var, d);
 	return var;
 #else
--- a/wscript
+++ b/wscript
@@ -545,6 +545,8 @@ int main() { return 0; }''',
     if opt.use_libcpp or conf.env['build_host'] in [ 'yosemite', 'el_capitan', 'sierra', 'high_sierra', 'mojave', 'catalina' ]:
         cxx_flags.append('--stdlib=libc++')
         linker_flags.append('--stdlib=libc++')
+        if platform == 'linux':
+            cxx_flags.append('-DUSE_LIBCXX')
 
     if conf.options.cxx11 or conf.env['build_host'] in [ 'mavericks', 'yosemite', 'el_capitan', 'sierra', 'high_sierra', 'mojave', 'catalina' , 'bigsur', 'monterey', 'ventura' ]:
         conf.check_cxx(cxxflags=["-std=c++11"])
-- 
2.40.1