cmake/StdAtomic.cmake

   1 # Check if std::atomic needs -latomic
   2
   3 include(CheckCXXSourceCompiles)
   4
   5 set(
   6   check_std_atomic_source_code
   7   [=[
   8     #include <atomic>
   9     int main()
  10     {
  11       std::atomic<long long> x;
  12       ++x;
  13       (void)x.load();
  14       return 0;
  15     }
  16   ]=])
  17
  18 check_cxx_source_compiles("${check_std_atomic_source_code}" std_atomic_without_libatomic)
  19
  20 if(NOT std_atomic_without_libatomic)
  21   set(CMAKE_REQUIRED_LIBRARIES atomic)
  22   check_cxx_source_compiles("${check_std_atomic_source_code}" std_atomic_with_libatomic)
  23   set(CMAKE_REQUIRED_LIBRARIES)
  24   if(NOT std_atomic_with_libatomic)
  25     message(FATAL_ERROR "Toolchain doesn't support std::atomic with nor without -latomic")
  26   else()
  27     target_link_libraries(standard_settings INTERFACE atomic)
  28   endif()
  29 endif()