[R-pkg-devel] C++11 requirements for package dependencies

[Duncan Murdoch]

I think that C++11 isn't a requirement of RcppArmadillo, it's an option 
that is used if available.  (Assuming you are using the CRAN version, 
not an experimental/devel version.)  A user of the header file can include

#define ARMA_USE_CXX11

which would make it a system requirement of whatever package did that, 
even though it isn't a system requirement for RcppArmadillo.

But I could be wrong about this...

Duncan Murdoch

On 30/11/2020 11:06 a.m., Mark Clements wrote:
> [Apologies for cross-posting]
> 
> A colleague uses a package I maintain (rstpm2) as a dependency in their
> package (rsimsum) with testing using GitHub Actions. They found that
> testing failed against R versions 3.3, 3.4 and 3.5 because recent
> versions of RcppArmadillo (which is a dependency in rstpm2) require
> C++11. As a dependency diagram:
> 
> rsimsum --> rstpm2 --> RcppArmadillo
> 
> Should I update rstpm2 to include "CXX_STD = CXX11" in the Makevars and
> Makevars.win files and add "SystemRequirements: C++11" to the
> DESCRIPTION, or is there a simple way in GitHub Actions to use C++11 for
> older versions of R?
> 
> Moreover, as a principle, should a package need to change the Makevars
> and DESCRIPTION files to suit the most recent updates of their
> dependencies? I would have thought that such a need would break many
> packages.
> 
> Sincerely, Mark.
> 
> 
> 
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