apple llvm 6.1 error invalid library name -stdlib=libc++ compiler-default

when I reference C++ codes in an O-C file, I modify the .m file to .mm according to articles on the internet. Then I build the project. Unfortunately，I got the err msg below:

apple llvm 6.1 error invalid library name -stdlib=libc++ compiler-default

I have try all the compilers in building settings->C++ language but they don't work. I have try kinds of grammars but they can't work. Now I can't locate the question.Is there someone know about this? Thank you :)

via Chebli Mohamed