another clang build problem, LLVM_ENABLE_LTO=thin causes make to break when specifying -j
I must be doing something wrong here or missing something.
When I add -DLLVM_ENABLE_LTO=thin to
the cmake command and then try to make clang with make -j n, it
jumps immediately to trying to link and fails. This is true with
-j 1, so it is something about the make and not parallelism. I am
running the system make on ubuntu 14.4 (don't ask...)