F21 system GCC changed to 4.9.0 prerelease

[Josh Boyer]

On Thu, Apr 10, 2014 at 10:06 AM, Josh Boyer <jwboyer at fedoraproject.org> wrote:
> On Thu, Apr 10, 2014 at 6:23 AM, Jakub Jelinek <jakub at redhat.com> wrote:
>> Hi!
>>
>> FYI, gcc in rawhide has been upgraded to 4.9.0 prerelease,
>> please visit http://gcc.gnu.org/gcc-4.9/porting_to.html if your
>> package no longer builds.  To investigate runtime rather than compile time
>> issues, please consider using temporarily -fsanitize=undefined and/or
>> -fsanitize=address to look for undefined behavior in the packages
>> you own.
>
> Hm.  So the kernel I tried to build this morning failed on ARM:
>
> http://koji.fedoraproject.org/koji/getfile?taskID=6723963&name=build.log
>
> That cross-built locally (gcc 4.8.1) here fine before I sent it to
> koji.  Anyone have any ideas on that?

An f20 scratch build of the same SRPM has progressed past the failure
point above.  I suppose I'll dig into what changed in this regard and
see if there's a fix that works for both.  In the meantime, if anyone
knows what might have changed in gcc 4.9 to cause this, please speak
up.

http://koji.fedoraproject.org/koji/taskinfo?taskID=6724145

josh