Xcode: unrecognized command line option '-stdlib='

I am getting unrecognized command line option '-stdlib=' error when trying to compile my project. I already disable linking with standard library option, but -stdlib= flag is still there.

g++-4.8: error: unrecognized command line option '-stdlib='
Command /usr/local/bin/g++-4.8 failed with exit code 1

Any help/suggestion is appreciated.