Tests/RunCMake/XcodeProject/use_cmath.cpp - third_party/github.com/Kitware/CMake - Git at Google

 #include <cmath>

 bool foo(double arg)
 {
   return std::isfinite(arg);
 }
	#include <cmath>

	bool foo(double arg)
	{
	return std::isfinite(arg);
	}