Ad-hoc fix for testthat's C entrypoint

[Enchufa2]

Background here. It all comes to this call that relies on tools::package_native_routine_registration_skeleton for the generation of registering code, but such function does not make any effort to detect the types of the extern declarations here. It's just void * for every argument, which works without LTO, but generates a warning with LTO enabled.

So in this patch we just substitute void * with SEXP for the particular case of testthat's C entrypoint, to make the life of these users easier. We probably could apply this to every declaration, but this should be further investigated. We can revisit this if new reports come out with other functions.

To test this:

Rcpp::Rcpp.package.skeleton()
#> Creating directories ...
#> Creating DESCRIPTION ...
#> Creating NAMESPACE ...
#> Creating Read-and-delete-me ...
#> Saving functions and data ...
#> Making help files ...
#> Done.
#> Further steps are described in './anRpackage/Read-and-delete-me'.
#> 
#> Adding Rcpp settings
#>  >> added Imports: Rcpp
#>  >> added LinkingTo: Rcpp
#>  >> added useDynLib directive to NAMESPACE
#>  >> added importFrom(Rcpp, evalCpp) directive to NAMESPACE
#>  >> added example src file using Rcpp attributes
#>  >> added Rd file for rcpp_hello_world
#>  >> compiled Rcpp attributes
setwd("anRpackage/")
testthat::use_catch()
#> > Added C++ unit testing infrastructure.
#> > Please ensure you have 'LinkingTo: testthat' in your DESCRIPTION.
#> > Please ensure you have 'Suggests: xml2' in your DESCRIPTION.
#> > Please ensure you have 'useDynLib(anRpackage, .registration = TRUE)' in your NAMESPACE.
desc <- paste(readLines("DESCRIPTION"), collapse="\n")
cat(paste0(desc, ", testthat\nSuggests: xml2\n"), file="DESCRIPTION")
Rcpp::compileAttributes()
readLines("src/RcppExports.cpp")[24]
#> [1] "RcppExport SEXP run_testthat_tests(SEXP);"

and then compilation succeeds without warning.

Checklist

• Code compiles correctly
• R CMD check still passes all tests
• Preferably, new tests were added which fail without the change
• Document the changes by file in ChangeLog

[eddelbuettel]

On behalf of the testthat + catch users: thank you!

[kevinushey]

LGTM; the workaround is greatly appreciated!

[osorensen]

Fantastic! Thank you @Enchufa2!

[eddelbuettel]

No issues whatsoever in reverse-dependency checks, so merging. Will also increment to micro version so there will be a dev version 1.0.11.2 at the Rcpp drat and at r-universe.