From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark H Weaver <mhw@netris.org>
Subject: Re: [PATCH 24/24] gnu: qt: Update qt to 5.7.0.
Date: Sat, 20 Aug 2016 14:50:03 -0400
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	(David Craven's message of "Sat, 20 Aug 2016 17:40:32 +0200")
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To: David Craven <david@craven.ch>
Cc: guix-devel <guix-devel@gnu.org>

David Craven <david@craven.ch> writes:

> Are we still using gcc 4.9 as our default compiler? I think that some
> of the build failures could be caused by that. qt 5.7 requires a c11
> compiler and gcc 4.9 still defaults to the c99 standard. Any
> dependency on qt 5.7 also needs to be compiled with a c11 compiler.
>
> Are there plans to upgrade the default gcc? 

We can only change the default compiler in core-updates.  We tried to
upgrade gcc to 5.x in our last core-updates cycle, but had to revert
that change because the new gcc failed to bootstrap on armhf, because of
unexpected differences in stages 2 and 3.

Interestingly, in the current core-updates cycle, which modestly updates
to 4.9.4 only, is running into the same problem on armhf:

  https://hydra.gnu.org/build/1443911/nixlog/6/tail-reload

In any case, if your Qt updates depend on GCC 5.x, then we may need to
revert these upgrades on 'master' and revisit them after we've
successfully updated our default GCC.

> I look into fixing the packages temporarily.

     Thanks,
       Mark