mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-29 16:05:28 +00:00
fd78a7dd5c
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231022 91177308-0d34-0410-b5e6-96231b3b80d8
40 lines
1.1 KiB
CMake
40 lines
1.1 KiB
CMake
# atomic builtins are required for threading support.
|
|
|
|
INCLUDE(CheckCXXSourceCompiles)
|
|
|
|
check_function_exists(__atomic_fetch_add_4 HAVE___ATOMIC_FETCH_ADD_4)
|
|
if( NOT HAVE___ATOMIC_FETCH_ADD_4 )
|
|
check_library_exists(atomic __atomic_fetch_add_4 "" HAVE_LIBATOMIC)
|
|
set(HAVE_LIBATOMIC False)
|
|
if( HAVE_LIBATOMIC )
|
|
list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
|
|
endif()
|
|
endif()
|
|
|
|
CHECK_CXX_SOURCE_COMPILES("
|
|
#ifdef _MSC_VER
|
|
#include <Intrin.h> /* Workaround for PR19898. */
|
|
#include <windows.h>
|
|
#endif
|
|
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_HAS_ATOMICS)
|
|
|
|
if( NOT LLVM_HAS_ATOMICS )
|
|
message(STATUS "Warning: LLVM will be built thread-unsafe because atomic builtins are missing")
|
|
endif()
|