libstdc++-v3/testsuite/17_intro/versionconflict.cc - gcc - Git at Google

 // { dg-do preprocess }
 // { dg-additional-options "-Werror" }

 // Test for redefinitions of FTMs using bits/stdc++.h.
 #define _GLIBCXX_TESTING_SYSHDR
 #include <bits/stdc++.h>
 #include <version>
	// { dg-do preprocess }
	// { dg-additional-options "-Werror" }

	// Test for redefinitions of FTMs using bits/stdc++.h.
	#define _GLIBCXX_TESTING_SYSHDR
	#include <bits/stdc++.h>
	#include <version>