[Bug bootstrap/12761] [3.4 regression] Segmentation fault in gnat1 compiling a-except.adb
dave at hiauly1 dot hia dot nrc dot ca
gcc-bugzilla@gcc.gnu.org
Sun Nov 2 19:03:00 GMT 2003
PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12761
------- Additional Comments From dave at hiauly1 dot hia dot nrc dot ca 2003-11-02 19:03 -------
Subject: Re: [3.4 regression] Segmentation fault in gnat
> > So, it looks to me as if it could be an ada problem. I suspect a problem
> > with the type for Names(J).
>
> Correction: an ada problem in a previous gcc version.
It doesn't matter. The 3.3 branch bootstraps without problems. My
understanding is that the 3.3 branch is still open and there will be
another release.
The change(s) to exp_ch3.adb between 3.3 and 3.4 introduced the regression.
There is "no distinction between patches which are themselves buggy and
patches that expose latent bugs elsewhere in the compiler." See
<http://gcc.gnu.org/develop.html>. I believe that it was this patch
that introduced the regression:
2003-10-21 Arnaud Charlet <charlet@act-europe.fr>
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> One possibility would be to start the bootstrap with another version of gnat
> (e.g gnat 3.15p from ftp.cs.nyu.edu/pub/gnat/3.15p/contrib - I have
> not tried it myself, so it may or may not work).
I believe that it is necessary to start a bootstrap with ada with a gnat1
version that is no more than one release older than the version that is
being built. Thus, I would proably have to build 3.3. The hppa-linux
port was built using a cross from i386 and it exhibits the same behavior.
In any event, this isn't going to address the problem introduced by
your patch.
> Another possibility as you mentioned is for you to rewrite slightly the
> current code as to avoid the bootstrap failure, and once you have
> a more reliable gcc 3.4, use it for further bootstraps.
Be careful in saying "you". I have spent several hours debugging this
problem and get upset when a patch author suggests it is my responsibility
to fix a problem introduced by his/her patch.
Dave
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