Tests/Visibility/hidden.c - third_party/github.com/Kitware/CMake - Git at Google

 int hidden_function(void)
 {
   return 0;
 }

 __attribute__((visibility("default"))) int not_hidden(void)
 {
   return hidden_function();
 }
	int hidden_function(void)
	{
	return 0;
	}

	__attribute__((visibility("default"))) int not_hidden(void)
	{
	return hidden_function();
	}