I think what the GP was saying is: Ignore the new feature you're using from that upstream project for a minute. Did you try compiling your project with -std=c+

I think what the GP was saying is: Ignore the new feature you're using from that upstream project for a minute. Did you try compiling your project with -std=c++11 before doing any other change? That is the only way you'd clearly see the difference of switching to C++11 in your project. Maybe it won't add any compilation time, it could even be faster... And then you add the new feature and your compile time goes crazy, that's unfortunate indeed, but that's the price of not being penalized at run time with the [cool new C++11 feature the upstream project is using], you have to endure a longer compile time. But you can't blame C++11 for it, without it that feature wouldn't even exist!