This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug bootstrap/18972] Regression: bootstrap failure of gcc-4.0-20041212 on OpenDarwin 7.2.1/x86 (i686-apple-darwin7.2.1): Bootstrap comparison failure
- From: "lars dot sonchocky-helldorf at hamburg dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 14 Dec 2004 16:18:50 -0000
- Subject: [Bug bootstrap/18972] Regression: bootstrap failure of gcc-4.0-20041212 on OpenDarwin 7.2.1/x86 (i686-apple-darwin7.2.1): Bootstrap comparison failure
- References: <20041214004742.18972.lars.sonchocky-helldorf@hamburg.de>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From lars dot sonchocky-helldorf at hamburg dot de 2004-12-14 16:18 -------
Indeed a Heisenbug:
reload.o from stage2 and stage3 differ when produced like this:
touch ../../gcc-4.0-20041212/gcc/reload.c
make restage2 BOOT_CFLAGS="-O2 -g -fomit-frame-pointer"
make restage3 BOOT_CFLAGS="-O2 -g -fomit-frame-pointer"
the resultingg reload.o differ just in one byte at offset 0000B577h:
for stage2 it is: D0
for stage3 it is: C4
now in context:
stage2: 0000 B570h: 7E B9 31 C0 8B 8C 24 D0 00 00 00 89 84 24 6C 02
stage3: 0000 B570h: 7E B9 31 C0 8B 8C 24 C4 00 00 00 89 84 24 6C 02
Does anyone know how I could disassemble those .o files to get something more
human readable?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18972