[Bug middle-end/15937] [3.3 only] miscompiles gengtype of HEAD as bootstrap compiler

["wilson at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From wilson at gcc dot gnu dot org  2004-06-17 06:23 -------
I am not able to reproduce this problem.

I tried first on a debian testing system.  I bootstrapped the gcc-3.3.4 tarball
with --enable-languages=c, and then tried to bootstrap mainline.  gengtype
worked correctly.

I then tried on a debian unstable system.  I ran apt-get to make sure everything
was up to date, then tried to bootstrap mainline using /usr/bin/gcc which is
gcc-3.3.4-1.  gengtype worked correctly.

I suspect that this may be a bison/flex versioning problem rather than a gcc
optimizer bug.  Perhaps the debian folks have already updated the bison/flex
packages to make this problem go away, or perhaps you have out of date versions
of the bison/flex packages, or perhaps someone has already applied a patch to
the bison/flex input files on mainline that fixed the problem.  There is no easy
way for me to tell.

By the way, reporting a bug against mainline is a bit ambiguous, unless you
indicate when you checked out mainline.  If you use contrib/gcc_update, then you
can include the LAST_UPDATED file.  Otherwise, you can try attaching the top
entry of the relevant ChangeLog file, e.g. gcc/ChangeLog for gcc problems.

I notice that gengtype was compiled without optimization.  If you configure
normally, it will be compiled with -O2.  That implies that you did something
different when configuring that you failed to specify in the bug report.  This
could perhaps explain why I could not reproduce the problem.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15937