Due to a typo in Base.xcconfig, C++ exceptions are enabled when building with llvm-gcc-4.2. This regressed in ToT WebKit r80915. <http://trac.webkit.org/changeset/80915>
<rdar://problem/9446430>
Created attachment 93683 [details] Patch v1
Committed r86598: <http://trac.webkit.org/changeset/86598>