Am Dienstag, 5. Juli 2016 um 17:23:40, schrieb Jean-Marc Lasgouttes 
<lasgout...@lyx.org>
> Le 05/07/2016 à 12:23, Guillaume Munch a écrit :
> >> I figured that the difference were minimal, but if I am wrong I can
> >> revert this part of course. Only cygwin requires gnu++11.
> >
> > As far as I understand, the difference is precisely to enable
> > non-standard extensions. I do see the point of disabling non-standard
> > extensions for a cross-platform software.
> 
> We have compiled for ages in gnu++98 mode forever when not using C++11. 
> And currently gcc 6 uses gnu++14 by default. Do you want me to force 
> c++14 instead?
> 
> I do not know what cmake does BTW, but we will eventually synchronize 
> these kind of choices.

Cmake tries to use  -std=c++14 first, then c++11, gnu++11, gnu++0x

See development/cmake/modules/FindCXX11Compiler.cmake:50

> JMarc

        Kornel

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