Hmm... I had mentioned this patch to some coworkers who have much more knowledge about LLVM than me. They had concern that LLVM needs memset to be defined, and that there were discussions on the llvm mailing list about this.
I'm digging through trying to find anything relevant, maybe this one about memcpy: https://lists.llvm.org/pipermail/llvm-dev/2012-May/050108.html I wonder if -ffreestanding is more appropriate?
