[Dune] g++ support

[Dedner, Andreas]

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Probably an outdated CI config.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<mailto: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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