cmake HAS_MOUTLINE_ATOMICS examples

awslabs/amazon-kinesis-producer CMakeLists.txt :163 

check_c_compiler_flag(-moutline-atomics HAS_MOUTLINE_ATOMICS)

awslabs/aws-c-common cmake/AwsCFlags.cmake :132 

check_c_source_compiles("
                int main() {
                    int x = 1;
                    __atomic_fetch_add(&x, -1, __ATOMIC_SEQ_CST);
                    return x;
                }" HAS_MOUTLINE_ATOMICS)