[Rcpp-devel] Rf_error() format string

[Dirk Eddelbuettel]

Sorry for being slow to respond (very busy morning at work and play, got five
such emails myself) but as Inaki and Georgi helpfully pointed out already the
issue is _known_ and has a _fix_ at either the default branch of the Rcpp
repo, or, if you prefer, via the Rcpp drat repo as detailed in this comment
of issue #1287 at the Rcpp repo

   https://github.com/RcppCore/Rcpp/issues/1287#issuecomment-1829886024

from which I quote (and, again, sorry for not posting here sooner)

  Yes, I actually got five such emails myself today for packages of mine
  using Rcpp.

  The fix is simple thanks to PR #1288 we made two days ago. Install Rcpp
  1.0.11.5 from the Rcpp drat repo via, e.g.,

     Rscript -e 'install.packages("Rcpp", \
         repos=c("https://RcppCore.github.io/drat", getOption("repos")))'

  and then re-run compileAttributes(). That will fix the RcppExports.cpp file
  for you. You then need to upload your updated package to CRAN. It has no
  change in its run-time dependency on Rcpp so you do not need to change
  anything in DESCRIPTION. Just re-run compileAttributes().

Of course, you can also use whichever tool runs `compileAttributes()` for
you. I tend to use `littler` script `compAttr.r` on the command-line. Others
rely on RStudio which automagically does it if it notices you rebuild a
package using Rcpp.  I believe the devtools/usethis nexus has this in
`document_all()` (?), and I am sure someone somewhere cooked something up for
VSCode too.  The key is the provided function Rcpp::compileAttributes() which
remains at your service and is now updated.

I may also push an updated `rocker/drd` container which I recently switched
to being based on ubuntu and r2u (rather than debian).  Then installing your
build dependencies for you packages is trivial (I run `installDeps.r` inside
the container) and it will come with an r-devel build. You "only" need to
create `~/.R/Makevars` to tell the compiler to use extended format warnings.
That allows you to replicate the CRAN warnings, and ensure rebuild
RcppExports.cpp addresses it.  If I find time I'll post an example on my
blog.

Cheers, Dirk

-- 
dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org