From e2084b4a98d550bd5011a8b7de5014dd6c00412d Mon Sep 17 00:00:00 2001
From: Vicki Pfau <vi@endrift.com>
Date: Tue, 30 Aug 2022 00:20:13 -0700
Subject: [PATCH] macOS: Fix very old Xcode build

---
 CMakeLists.txt             | 7 +++++++
 include/mgba-util/common.h | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e4e99f964..f6a8ab221 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -240,6 +240,13 @@ if(APPLE)
 	if(NOT CMAKE_SYSTEM_VERSION VERSION_LESS "10.0") # Darwin 10.x is Mac OS X 10.6
 		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mmacosx-version-min=10.6")
 	endif()
+	# Not supported until Xcode 9
+	if(CMAKE_C_COMPILER_ID STREQUAL "AppleClang" AND CMAKE_C_COMPILER_VERSION VERSION_LESS "9")
+		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__STDC_NO_THREADS__=1")
+	endif()
+	if(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "9")
+		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__STDC_NO_THREADS__=1")
+	endif()
 endif()
 
 if(NOT HAIKU AND NOT MSVC AND NOT PSP2)
diff --git a/include/mgba-util/common.h b/include/mgba-util/common.h
index 8f14706d3..4583ac0ed 100644
--- a/include/mgba-util/common.h
+++ b/include/mgba-util/common.h
@@ -84,6 +84,10 @@ typedef intptr_t ssize_t;
 #define M_PI 3.141592654f
 #endif
 
+#if !defined(__cplusplus) && !defined(static_assert)
+#define static_assert(X, C) _Static_assert((X), C)
+#endif
+
 #if !defined(_MSC_VER) && (defined(__llvm__) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
 #define ATOMIC_STORE(DST, SRC) __atomic_store_n(&DST, SRC, __ATOMIC_RELEASE)
 #define ATOMIC_LOAD(DST, SRC) DST = __atomic_load_n(&SRC, __ATOMIC_ACQUIRE)