Re: [boost] Strange libstdc++ versions in travis-ci testers

Subject: Re: [boost] Strange libstdc++ versions in travis-ci testers
From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2018-06-29 02:55:42

On Thu, Jun 28, 2018 at 9:11 PM Peter Dimov via Boost <boost_at_[hidden]>
wrote:

> Rene Rivera wrote:
>
> > On Thu, Jun 28, 2018 at 4:40 PM Peter Dimov via Boost
> > <boost_at_[hidden]> wrote:
> >
> > > To detect the actual libstdc++ version, you should use the
> Boost.Config
> > > macro, as it's generally more reliable.
> >
> > Why is it more reliable?
>
> __GLIBCXX__ is a date, which is not very useful for determining the
> version.
>

Which is what Predef uses. And also uses __GLIBCPP__ as fallback. But, yes
they are dates, as that's the only real indicator of *only* libstdc++ I
knew of.

There's _GLIBCXX_RELEASE but that's only for 7 and up. Config uses
>

Hm, hadn't kept up on that. I'll have to add that if available.

> __has_include to detect the version under Clang,

How would __has_include help?

> __GNUC__ under g++.
>

But that's the g++ version, not the lib version.

I guess I should check the Config code :-)

-- 
-- Rene Rivera
-- Grafik - Don't Assume Anything
-- Robot Dreams - http://robot-dreams.net