Program build fails on Mac OS X 10.9.2 with clang error message


I’m building a program on my Mac with Mac Os X 10.9.2, and Xcode 5.0.2. As compiler, I use Apple LLVM 5.0, Architecture is i386, and base SDK is 0S X 10.6. When I launch the build, I get the following error message, and the build fails :

clang: error: argument unused during compilation: ‘-mlong-branch’
Command /Applications/ failed with exit code 1

What should I do to avoid this error ? Find this argument and remove it everywhere I find it ?

Thank you

This is not the appropriate help list for Xcode and Apple LLVM builds—please use the forums at or file a bug at (Yes, I know our reputation for bug reports, but I promise we are looking at them.) That said, I can’t think what else to do besides remove the argument.