[Bug c/34841] 'make check' of libsndfile-1.0.17 fails with gcc-4.2.2 -O2 optimization, OK with -O1 one

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

------- Comment #17 from manu at gcc dot gnu dot org  2008-01-18 14:49 -------
(In reply to comment #15)
> With CFLAGS='-O2 -Wstrict-overflow=5' still there is no warnings in
> 'make_check.log':
> 
> If I do _not_ have "-Wstrict-overflow", I _do_ have these warnings during
> compilation:

Any of those looks like a bug to me. At a minimum, one warning flag that
doesn't warn should not affect another that does.

> Folks, libsndfile is easy to compile - it has (kind of) no external 
> dependencies, i.e. it depends only on basic libraries like libm, glibc, etc.,
> so you can easily conduct such experiments yourselves - the the needed "beef",
> including libsdnfile sources, is in the uploaded file.

I personally hack gcc in my precious free time. The larger the file that
triggers the bug, the harder and tedious it becomes to simply understand what
is going on, let alone having a chance to fix it.


-- 

manu at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
   Last reconfirmed|0000-00-00 00:00:00         |2008-01-18 14:49:09
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34841