On 31.07.2021 04:15, Tim Keitt wrote:
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?
Well, there is no platform indepednet code for dealing with that field,
but some parts may be scripted on parts of CRAN.
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?
Any changes in new submissions need a new version number.
Best,
Uwe Ligges
Thanks.
THK
On Fri, Jul 30, 2021 at 2:06 PM Dirk Eddelbuettel <e...@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 | e...@debian.org
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