From 8a22938e76396fcbe2fc174686322e6e2e874ad4 Mon Sep 17 00:00:00 2001
From: Chris Bieneman <beanz@apple.com>
Date: Fri, 12 Aug 2016 01:29:26 +0000
Subject: [CMake] If the compiler supports _Atomic include atomic.c in builtins
 libraries

This fixes a long-standing TODO by implementing a compiler check for supporting the _Atomic keyword. If the _Atomic keyword is supported by the compiler we should include it in the builtin library sources.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@278454 91177308-0d34-0410-b5e6-96231b3b80d8
---
 cmake/builtin-config-ix.cmake | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'cmake/builtin-config-ix.cmake')

diff --git a/cmake/builtin-config-ix.cmake b/cmake/builtin-config-ix.cmake
index 432b1fadb..83466d81b 100644
--- a/cmake/builtin-config-ix.cmake
+++ b/cmake/builtin-config-ix.cmake
@@ -1,4 +1,5 @@
 include(BuiltinTests)
+include(CheckCSourceCompiles)
 
 # Make all the tests only check the compiler
 set(TEST_COMPILE_ONLY On)
@@ -14,6 +15,15 @@ builtin_check_c_compiler_flag(-mfloat-abi=soft      COMPILER_RT_HAS_FLOAT_ABI_SO
 builtin_check_c_compiler_flag(-mfloat-abi=hard      COMPILER_RT_HAS_FLOAT_ABI_HARD_FLAG)
 builtin_check_c_compiler_flag(-static               COMPILER_RT_HAS_STATIC_FLAG)
 
+builtin_check_c_compiler_source(COMPILER_RT_SUPPORTS_ATOMIC_KEYWORD
+"
+int foo(int x, int y) {
+ _Atomic int result = x * y;
+ return result;
+}
+")
+
+
 set(ARM64 aarch64)
 set(ARM32 arm armhf)
 set(X86 i386 i686)
-- 
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