CHECK_CXX_SOURCE_COMPILES("
int f() {
  static int x = 1;
  if (x == 1) {
    return 0;
  } else {
    __builtin_unreachable();
    // Note: the lack of return here is intentional
  }
}

int main() {
  return f();
}
"
FRUIT_HAS_BUILTIN_UNREACHABLE)