问题
Unsupported compiler 'com.apple.compilers.llvmgcc42' selected for architecture 'armv7'
Check dependencies
Unsupported compiler 'com.apple.compilers.llvmgcc42' selected for architecture 'armv7'
Unable to determine concrete GCC compiler for file /Users/xxxl/main.m of type sourcecode.c.objc.
解决方法：
Change your compiler for C/C++/ObjectiveC Go to Build Settings->Build OPtions->compiler for C/C++/ObjectiveC; select Default(Apple LLVM5.0)