The following code doesn't compile
uint64_t i = x.load(std::memory_order_relaxed);
return 0;
when CMAKE_C_FLAGS set to -Werror -Wall, thus incorrectly
breaking the CMake configuration step:
-- Looking for __atomic_load_8 in atomic
-- Looking for __atomic_load_8 in atomic - not found
CMake Error at cmake/modules/CheckAtomic.cmake:79 (message):
Host compiler appears to require libatomic for 64-bit operations, but
cannot find it.
Call Stack (most recent call first):
cmake/config-ix.cmake:360 (include)
CMakeLists.txt:671 (include)
std::atomic<uint64_t> x (0);
int main() {
uint64_t i = x.load(std::memory_order_relaxed);
+ (void)i;
return 0;
}
" ${varname})