https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70704
--- Comment #37 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Marek tried to reproduce this using the RC1 tarball, but it seems it went through comparison just fine; configure line has been: /home/xxxxxxx/gcc-6.0.1-RC-20160415/configure --prefix=/home/xxxxxxx/rc --enable-checking=release --with-gmp=/opt/cfarm/gmp-latest/ --with-mpc=/opt/cfarm/mpc-latest/ --with-mpfr=/opt/cfarm/mpfr-latest/ In the failed build tree, can you please do: cd gcc for i in gt-* gtype*.[ch]; do diff ../stage1-gcc/$i $i; done cd ../prev-gcc for i in gt-* gtype*.[ch]; do diff ../stage1-gcc/$i $i; done (or change cd gcc and cd ../prev-gcc to cd stage3-gcc and cd ../stage2-gcc if upon the failure the dirs stay named stage{1,2,3}-gcc instead of {stage1-,prev-,}gcc ?