[Dune] g++ support

[Christoph Grüninger]

Hi Andreas,
GCC 7 is our current requirement for Dune core master. The issue was, that one CI was configured to explicitly use -std=c++14. Thus the failure.

Bye
Christoph

> Am 19.03.2020 um 20:04 schrieb Dedner, Andreas <A.S.Dedner at warwick.ac.uk>:
> 
> Still it would be good to clarify the g++ requirements - or should 7.3 work?
> From: Christoph Grüninger <foss at grueninger.de>
> Sent: 19 March 2020 18:08
> To: Dedner, Andreas <A.S.Dedner at warwick.ac.uk>
> Cc: dune at lists.dune-project.org <dune at lists.dune-project.org>
> Subject: Re: [Dune] g++ support
>  
> Hi Andreas,
> Probably an outdated CI config. Since https://gitlab.dune-project.org/core/dune-common/-/merge_requests/786 it works for me. I rebased and force-pushed my branch and all went green.
> 
> Bye
> Christoph
> 
> Am 19.03.2020 um 18:40 schrieb Dedner, Andreas <A.S.Dedner at warwick.ac.uk>:
> 
>> Hi.
>> Hope you are all well...
>> 
>> I wanted to check, what the required g++ version now is?
>> In dune-common/README.md it says >=7 but for a few days now std::optinal is used in dune-common and that seems to fail with 7.3
>> which is the compiler our CI in Stuttgart is using with the Debian 10
>> image.
>> Best
>> Andreas
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>> Dune at lists.dune-project.org
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