https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111142
--- Comment #1 from Manuel Lauss <manuel.lauss at googlemail dot com> --- This is fairly new, something after 4aa14ec7d5b25722e4d02c29c8c1e22dcc5a4915 ("MATCH: [PR111109] Fix bit_ior(cond,cond) when comparisons are fp") may have caused this, since I was able to build mesa just 12 hours ago.