http://bugs.winehq.org/show_bug.cgi?id=33746
--- Comment #14 from Ken Thomases ken@codeweavers.com 2013-07-27 18:08:45 CDT --- (In reply to comment #9)
If you can identify the specific factor that causes the problem (e.g. use of clang as the compiler) then it makes sense to file a new bug with the appropriate project. Good luck!
What I meant here is that you should file a bug with the project that maintains the build tool at fault. For example, file a bug with the LLVM/clang project. Or file a bug with Apple regarding Xcode. From what you've said in comment 8, this does not appear to be a Wine bug.