For anyone who is getting LLVM compiler 4.2 error and for whom above solution did not work, Try clean+build or restart XCode / Mac. In my case restarting Xcode did not work but restarting Mac fixed the issue.
As far as I seen the crash log. I think you have set a wrong library path with '-I.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.