[R-pkg-devel] C++17

[Tim Keitt]

Kind of figured that out looking around on github. I added a config
(borrowed from one of your repos) to test for CXX17. I'm not sure its quite
working for me yet but I will figure it out. A couple of questions:

1) I had C++17 in the system requirements in the description file but might
remove it as I hope to make it check without CXX17. Does that have any
impact on installation or is it only informative/notification?
2) If we need to adjust a package currently on CRAN owing to platform
errors, should we keep the version the same or submit with a version bump?

Thanks.

THK

On Fri, Jul 30, 2021 at 2:06 PM Dirk Eddelbuettel <edd using debian.org> wrote:

>
> Section 2.7.3 'C++ Support' of the R Admin manual says, "C++ is not used
> by R
> itself, but support is provided ...".  This is all stored from when R
> itself
> is configure (prior to compiling) and override-able in package
> configuration
> (Section 2.7.3 covers that) but as that in other places _it all depends on
> what the user has installed in terms of C++ compilers_.
>
> So packages need to test. R 4.1.0 ensure that _if_ C++ is present it is at
> least C++11, R 4.2.0 (aka r-devel now) is currently set to roll this to
> C++14.  Which is ... actually rather nice and way better than what had
> only a
> few short years ago. But local system may still need to look after their
> local compilers.  I still get bug reports from folks "blessed" with a
> particularl Linux distro that seems to persist long enough so that people
> aren't even yet at g++ 4.8 or 4.9 (though that environment has workarounds
> too). Similarly even when R 4.2.0 comes our there will still be people
> trying
> to build our packages on R 3.6.* or R 3.5.*. Such is life.
>
> So in short, for my money, _assuming_ C++17 is present is still a wee bit
> far
> out. Test for it, enjoy it when it is present and deal with it if not.
>
> Dirk
>
> --
> https://dirk.eddelbuettel.com | @eddelbuettel | edd using debian.org
>
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