cmake FRUIT_HAS_HAS_TRIVIAL_COPY examples

google/fruit configuration/CMakeLists.txt :51 

CHECK_CXX_SOURCE_COMPILES("
int main() {
  bool b = __has_trivial_copy(int);
  (void) b;
  return 0;
}
"
FRUIT_HAS_HAS_TRIVIAL_COPY)