I introduced an error in the Xcode configuration files back in r157981. I should fix it.
Created attachment 217526 [details] Patch
Comment on attachment 217526 [details] Patch Not new with this patch, but the unique use of "supported" instead of YES/NO is a mystery to me.
GCC_ENABLE_OBJC_GC technically supports three values: unsupported, supported and required. NO is mapped to unsupported.
Comment on attachment 217526 [details] Patch Clearing flags on attachment: 217526 Committed r159665: <http://trac.webkit.org/changeset/159665>
All reviewed patches have been landed. Closing bug.