This seems to be in conflict with what others are reporting. Do you believe that the GHC 7.6.3 runtime, as shipped last spring, will fail to start up on 10.9? I have a hard time believing that - Apple almost never makes such breaking changes.
I don't see anything in the changes in darinmorrison/ghc<https://github.com/darinmorrison/ghc> that detect at run time the compiler used. The flag choices seem to be made on items detected at config time. Making the wrapper robust for both Xcode 4 and Xcode 5 doesn't strike me as hard at all - since presumably there is an easy way to detect which version of Xcode (or for that matter, the version gcc reports when it is really clang.) - Mark
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