Change your compiler for C/C++/Objective-C:
Xcode > Target > Build Settings > Build Options > Compiler for C/C++/Objective-C
Select Default compiler (Apple LLVM x.y)
Change your compiler for C/C++/Objective-C:
Xcode > Target > Build Settings > Build Options > Compiler for C/C++/Objective-C
Select Default compiler (Apple LLVM x.y)