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Fix for atomic intrinsics detection when using MSVC.

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Patch by Michael Beck!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90683 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Oscar Fuentes 2009-12-05 23:19:33 +00:00
parent 87bad707ed
commit 87e98075cc
1 changed files with 12 additions and 0 deletions
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12
cmake/modules/CheckAtomic.cmake
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@ -1,14 +1,26 @@
# atomic builtins are required for threading support.
INCLUDE(CheckCXXSourceCompiles)
#ifdef _MSC_VER
#include <windows.h>
#endif
CHECK_CXX_SOURCE_COMPILES("
int main() {
#ifdef _MSC_VER
volatile LONG val = 1;
MemoryBarrier();
InterlockedCompareExchange(&val, 0, 1);
InterlockedIncrement(&val);
InterlockedDecrement(&val);
#else
volatile unsigned long val = 1;
__sync_synchronize();
__sync_val_compare_and_swap(&val, 1, 0);
__sync_add_and_fetch(&val, 1);
__sync_sub_and_fetch(&val, 1);
#endif
return 0;
}
" LLVM_MULTITHREADED)