Bug#894302: Re[2]: g++-7: Compiler generates wrong code with warning options
On 06.05.2018 16:48, Vadim Zeitlin wrote:
> On Sun, 6 May 2018 13:42:48 +0200 Matthias Klose <doko@debian.org> wrote:
>
> MK> I am not aware of any Debian local patches which could trigger that. Please
> MK> could you check if you can reproduce this with GCC 8 as well?
>
> I can't reproduce the problem with the minimized test case using gcc 8
> from Sid (8.1.0-1). As an aside, gcc 8 also produces much smaller (less
> than 50%) assembly and object code from the same files compared to gcc 7,
> which surprised me. FWIW I can still reproduce the problem with the
> latest g++-7 (7.3.0-17) in exactly the same way as originally reported for
> 7.2.
>
> The original problem, in the real program I was working on, only appeared
> when using MinGW, so I can't [easily] test whether it is still present or
> not as there is no gcc-mingw-w64 8 in Debian yet, but I'll do it when it
> becomes available.
I doubt I'll have time for this. If you know how to build a debian package, you
could have a look at the gcc-7 package, debian/rules.patch and try to disable
some patches (is a gcc upstream snapshot taken from the gcc-7-branch ok?), and
then see if things get better. svn-updates is the big hammer, but you could try
to disable libstdc++-pic to pr84761 and see if things get better.
Matthias
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