On Mon, 6 Feb 2023 at 23:27, Avraham Adler <avraham.ad...@gmail.com> wrote: > > On Mon, Feb 6, 2023 at 9:46 PM Duncan Murdoch <murdoch.dun...@gmail.com> > wrote: > > > > On 06/02/2023 4:01 p.m., Duncan Murdoch wrote: > > > On 06/02/2023 3:46 p.m., Winston Chang wrote: > > >> I recently submitted a package to CRAN with "SystemRequirements: C++11". > > >> This raises the following NOTE on R-devel, and I was asked to fix and > > >> resubmit: > > >> > > >> * checking C++ specification ... NOTE > > >> Specified C++11: please update to current default of C++17 > > >> > > >> If I understand correctly, I have two options, neither of which will > > >> work: > > >> 1. Remove "SystemRequirements: C++11" entirely. The problem with this is > > >> that on systems with older versions of R (3.6 and below, I believe), it > > >> may > > >> try to compile the package with an older C++ standard, which will fail. > > >> 2. Update it to "SystemRequirements: C++17". The problem here is that on > > >> systems that don't have a C++17 compiler, the package won't build -- even > > >> though the package only actually requires a C++11 compiler. > > >> > > >> How should I deal with this? > > > > > > Are you allowed to say "C++11 or C++17"? > > > > Actually I can partially answer this: the test is not based on > > SystemRequirements, but on the log of the build, which now contains > > lines like this: > > > > using C compiler: ‘Apple clang version 12.0.0 (clang-1200.0.32.28)’ > > using C++ compiler: ‘Apple clang version 12.0.0 (clang-1200.0.32.28)’ > > using C++11 > > using SDK: ‘MacOSX11.1.sdk’ > > > > I get "using C++11" because of this line in Makevars: > > > > CXX_STD = CXX11 > > > > So I guess the answer is to change your Makevars to make that line > > conditional on running under an old version of R. If you figure out how > > to do that, could you post the recipe here? > > I believe this is closely related to this email [1]. Dirk and I and > Aymeric have been going through the same issue with nloptr as well. > Our current opinion is to leave it out, as it would restrict more > users to demand C++17, which is unneeded, than to have users with over > a decade old compiler which does not have C++11. Dirk and Aymeric, > please chime in if I have misstated. Regardless, according to > Professor Ripley, if you require specific features, you should mark > them in _both_ Makevars and SystemRequirements, which is implied in > the "r-devel" version of WRE which adds the words "also" in section > 1.2.4.
Could you please point to the specific passage? According to [1], section 1.2.4, declaring the C++ standard in SystemRequirements is only mandatory for C++17 or later. [1] https://cran.r-project.org/doc/manuals/r-devel/R-exts.html#Using-C_002b_002b-code -- Iñaki Úcar ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
