https://bugs.freedesktop.org/show_bug.cgi?id=99013
--- Comment #6 from Christoph Haag haagch@frickel.club --- The build system already uses llvm-config --version which contains the revision for svn versions. Of course it breaks when you update llvm without rebuilding mesa, and you probably don't want to run llvm-config --version every time the mesa libraries are loaded, so yea...
Anyway
Fixed in https://cgit.freedesktop.org/mesa/mesa/commit/ ?id=26ba8c920d2727cae8ab45096db70e4691b00245 .
Thanks, that fixed it on my llvm 3.9.