cmake COMPILER_RT_TARGET_HAS_ATOMICS examples

Lewuathe/mlir-hello thirdparty/llvm-project/compiler-rt/lib/profile/CMakeLists.txt :2 

CHECK_CXX_SOURCE_COMPILES("
#ifdef _WIN32
#include <intrin.h> /* Workaround for PR19898. */
#include <windows.h>
#endif
int main() {
#ifdef _WIN32
        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;
      }
" COMPILER_RT_TARGET_HAS_ATOMICS)

CTSRD-CHERI/cheribsd contrib/subrepo-cheri-compiler-rt/lib/profile/CMakeLists.txt :2 

CHECK_CXX_SOURCE_COMPILES("
#ifdef _WIN32
#include <intrin.h> /* Workaround for PR19898. */
#include <windows.h>
#endif
int main() {
#ifdef _WIN32
        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;
      }
" COMPILER_RT_TARGET_HAS_ATOMICS)