Bug#577973: gcc-4.4: optimization bug on x86

[Matthias Klose <doko@debian.org>]

On 15.04.2010 19:12, Kazuhiro NISHIYAMA wrote:
> Package: gcc-4.4
> Version: 4.4.3-7
> Severity: normal
>
> Ruby 1.9.1 HEAD compiled with gcc-4.4.x -O2 causes Segmentation fault.
> I can not reproduce on amd64.
>
> How to reproduce:
>   svn co -r 26571 http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_1
>   cd ruby_1_9_1
>   autoconf
>   ./configure
>   make miniruby
>   ./miniruby -e 'catch(:foo){throw :foo}'
>
> Ruby does not abort when use `./configure optflags=-O0`,
> `./configure optflags=-O1`, or `./configure optflags=-O3`.
> Then it seems gcc optimization bug.

- please recheck with gcc-snapshot-20100414 (GCC-4.5.0), when it is built.
- please try to combine/bisect object files built with -O0/-O2 to
  identify the maybe miscompiled file.
  then split the file to identify a miscompiled function ...