Tests/ComplexOneConfig/Library/notInAllLib.cxx - third_party/github.com/Kitware/CMake - Git at Google

 int notInAllLibFunc()
 {
   return 0;
 }

 #if 1
 #  error "This target should not be compiled by ALL."
 #endif
	int notInAllLibFunc()
	{
	return 0;
	}

	#if 1
	# error "This target should not be compiled by ALL."
	#endif