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Re: preparing for GCC 4.9

On Thu, May 8, 2014 at 11:25 PM, Matthias Klose <doko@debian.org> wrote:
> With gcc-4.9 now available in testing, it is time to prepare for the change of
> the default to 4.9, for a subset of architectures or for all (release)
> architectures.  The defaults for the gdc, gccgo, gcj and gnat frontends already
> point to 4.9 and are used on all architectures.  Issue #746805 tracks the
> gfortran default change, including the change of the Fortran 90 module version
> change.
> The Debian archive was rebuilt twice on amd64, once in February, resulting in
> bug submissions for GCC and feedback for the porting guide [1], a second time in
> March to file issues for packages failing to build with GCC 4.9 [2].  Another
> test rebuild for Ubuntu on amd64, i386, armhf, ppc64el didn't show any other
> compiler regressions on these architectures.
> I would like to see some partial test rebuilds (like buildd or minimal chroot
> packages) for other architectures. Any possibility to setup such a test rebuild
> for some architectures by the porters? Afaics the results for the GCC testsuite
> look okish for every architecture.

I set a build farm with gcc-4.9 for mips64el.
It works well: it has no more failures than your amd64 one.
All the buildlogs can be found in

I noticed ctpp2 failed due to symbols problems on both
  amd64(pbuilder) and mips64el(sbuild).

It seems that you didn't report bug on it.

> I'll work on fixing the build failures in [2], help is of course appreciated.
> Almost all build failures are analyzed and should be easy to fix (exceptions
> e.g. #746883).  Patches for the ones not caused by the Debian packaging may be
> found in distributions already using GCC 4.9 as the default compiler (e.g.
> Fedora 21).
> If anything goes well, and a large amount of build failures are fixed, I plan to
> make GCC 4.9 the default for the C/C++/ObjC/Obj-C++ frontends at the end of May,
> beginning of June.
> Bugs reports for packages building with a legacy version of GCC (4.6, 4.7, 4.8)
> will be filed.
>   Matthias
> [1] http://gcc.gnu.org/gcc-4.9/porting_to.html
> [2]
> https://bugs.debian.org/cgi-bin/pkgreport.cgi?tag=ftbfs-gcc-4.9;users=debian-gcc@lists.debian.org
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Yunqiang Su

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