https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100340
--- Comment #1 from Jürgen Reuter <juergen.reuter at desy dot de> --- After update to macOS Big Sur 11.3 with XCode 12.5 and Apple Clang clang-1205.0.22.9, bootstrap doesn't work any more: Comparing stages 2 and 3 warning: gcc/cc1obj-checksum.o differs warning: gcc/cc1objplus-checksum.o differs Bootstrap comparison failure! gcc/tree-ssa-operands.o differs gcc/tree-ssanames.o differs [...] lib/libz_a-deflate.o differs zlib/libz_a-gzread.o differs zlib/libz_a-inflate.o differs zlib/libz_a-crc32.o differs zlib/libz_a-inftrees.o differs
