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Subject:	Reporting bugs in GCC: a question of procedure
From:	Jesper Eskilson <jojo AT virtutech DOT se>
Organization:	Virtutech AB
Date:	14 Nov 2001 13:13:48 +0100
Message-ID:	<u67itcd1rer.fsf@rachel.vtab.com>
Lines:	33
User-Agent:	Gnus/5.09 (Gnus v5.9.0) Emacs/21.1
MIME-Version:	1.0

I have a piece of code which causes g++ to loop:

        g++ -O2 -c gccloopbug.i

By specifying -fno-rerun-cse-after-loop:

        g++ -O2 -fno-rerun-cse-after-loop -c gccloopbug.i

the bug disappears and g++ works nicely. Also, if you specify -dt (dump
debugging info after the CSE2-pass), the log file gccloopbug.i.cse2 grows
to be very large (200Mb before I killed it).

I haven't been able to reproduce this on my Linux-machine; mainly because
the preprocessed output doesn't compile on my Linux-machine. I was under
the impression that preprocessed output should be portable across different
hosts, but no.

If somebody wants to give it a try, I can send you the code.

The bug appears on all of the 2.95.3 series GCC released with Cygwin and
MingW. The latest I've tried is the MingW-released 2.95.3-7 version.

Should I report this as a GCC bug, even if I haven't been able to reproduce
it using the latest GCC version (i.e. 3.0.2, I guess)? Or should I just
switch of the rerun-cse-after-loop option and wait until 3.0.2 hits the
Cygwin and/or MingW shelves?

/Jesper
-- 
Jesper Eskilson
Virtutech



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