I see that both build and target are ppc64le. From your earlier comment, it sounds like you're trying to build for Power7. The combination of Power7 and little endian is not supported by LLVM. If that's not what's going on, it will take more investigation. I don't normally use cmake for bootstrap builds, so there may be something screwy there. (The community hasn't made the test suites work with cmake, so I find it pretty useless for day-to-day work.)