[Bug bootstrap/44959] [4.6 Regression] bootstrap failed at Comparing stages 2 and 3

["ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44959

--- Comment #40 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> 2013-04-15 12:51:20 UTC ---
> --- Comment #39 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-04-12 16:13:20 UTC ---
> Can this be reproduced with 4.7.3, 4.8.0 or trunk?

At most on the 4.7 branch: the Tru64 UNIX port was obsoleted in 4.7 and
removed in 4.8.

That said, I've no idea how BUILD_CONFIG would end up as bootstrap-debug
on Tru64 UNIX.  Even compiling the same source file twice produces
object files that aren't identical.  That's the reason config.log has

gcc_cv_prog_cmp_skip='cmp --ignore-initial=16 $$f1 $$f2'

if GNU cmp is installed.  compare-debug doesn't take this into account,
so if I manually run this code snippet from configure

    if echo "int f (void) { return 0; }" > conftest.c &&
       ${CC} -c conftest.c &&
       mv conftest.o conftest.o.g0 &&
       ${CC} -c -g conftest.c &&
       mv conftest.o conftest.o.g &&
       ${srcdir}/contrib/compare-debug conftest.o.g0 conftest.o.g
    then
      echo bootstrap-debug
    else
      echo none
    fi

with CC and srcdir set appropriately, I get none for CC=gcc-4.4 and CC=cc.

Please try this on your system and tell us how you end up with
bootstrap-debug instead of none.

    Rainer