R CMD check note: Found no calls to: ‘R_registerRoutines’, ‘R_useDynamicSymbols’

Question

How to avoid the following NOTE that is appearing in R CMD check with the new R development version ( R Under development (unstable) (2017-02-15 r72179))?

• checking for unstated dependencies in examples ... OK • checking line endings in C/C++/Fortran sources/headers ... OK • checking compiled code ... NOTE File ‘pkgname/libs/pkgname.so’:   Found no calls to: ‘R_registerRoutines’, ‘R_useDynamicSymbols’  It is good practice to register native routines and to disable symbol search. 

For example in Hmisc

Answer 1

The message is somewhat arcane. I looked around also in other packages and I found that the useDynLib(packagename) in the NAMESPACE file was replaced by useDynLib(packagename, .registration = TRUE).

In addition, I added a .c file, named registerDynamicSymbol in the src/ directory with the following code:

// RegisteringDynamic Symbols  #include <R.h> #include <Rinternals.h> #include <R_ext/Rdynload.h>  void R_init_markovchain(DllInfo* info) {   R_registerRoutines(info, NULL, NULL, NULL, NULL);   R_useDynamicSymbols(info, TRUE); } 

I took this suggestion from GitHub Rcpp. The canonical reference is in Writing R Extensions

Also R Devel Mailinglist provided supplementary infos.

UPDATE

The most direct straightforward approach is:

1. use the current R Development Version (that will eventually become 3.4)
2. Run the tools::package_native_routine_registration_skeleton(".") and copy and paste the full output in a packagename_init.c file to be put in src/
3. update NAMESPACE, verifying that useDynLib(packagename, .registration = TRUE)
4. If necessary, replace the exportPattern with export( list of object to be exported )

UPDATE 18th July

As noted by @Symbolix using the most recent version of R and RStudio's devtools the point 2. (init.c files) appears handled by either devtools (using RStudio check digit) or tools packages.