message: Skip TestLibCxxAtomic with gcc
  older versions of libc++ (still used on some linux systems) are not
  compatible with gcc.
diff: @@ -23,6 +23,7 @@ class LibCxxAtomicTestCase(TestBase):
  var.SetPreferSyntheticValue(True)
  return var
  + @skipIf(compiler=["gcc"])
  @add_test_categories(["libc++"])
  def test(self):
  """Test that std::atomic as defined by libc++ is correctly printed by LLDB"""
  