I just noticed this after doing my daily mesa update. It failed. Here is the build log https://pastebin.com/4uDaiWNd
See https://gitlab.freedesktop.org/mesa/mesa/merge_requests/1202
src/gallium/targets/opencl/meson.build was changed in mesa master after the MR was created. I've attached the version I created for archlinux aur mesa-git based on the MR.
Created attachment 144686 [details] [review] rebased patch
FWIW, this was triggered by clang SVN r364424, not directly related to that Mesa commit. Anyway, fixed now with: https://gitlab.freedesktop.org/mesa/mesa/commit/3fd21a6b776e0f874e0e14d9943ac2b06bcc4aad
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