llvm-3.2-nodoctargz.patch doesn't seem to apply on top of current LLVM 3.7svn anymore. Attached is a simple modification to the patch I used in order to make it apply. Reproducible: Always Steps to Reproduce: 1. emerge =sys-devel/llvm-9999
Created attachment 399050 [details, diff] A hacked patch to make it apply
Thanks for the report and patch! Though this does not fix the live ebuild (as you have seen), at least it goes past the prepare phase Rewriting the ebuild to switch to the cmake build system is mandatory now, but that is a separate (and bigger) task