There seem to be issues with clang compiled with gcc 4.7. Either a recompilation with gcc 4.6 or [gcc 4.7 -fno-tree-pre] could help. see also: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53147 Other problems with clang and gcc 4.7 can be found on llvm's bugzilla. Regards, Tim