[Rcpp-devel] Rcpp shared libraries (?)

[Serguei Sokol]

Le 23/06/2022 à 15:02, THIOULOUSE JEAN a écrit :
> Hi
> 
> Sorry to bother you again with my C/C++ problems in the ade4 package (available on CRAN & GitHub).
> 
> Thanks to your help, I have succeeded in converting several of the C functions to C++ using Rcpp. Now the package compiles without problem and all my C++ functions run fine in the dedicated GitHub branch of the package (ade4-Rcpp).
> 
> The new problem I am facing now is that in ade4, I use a library of about 30 utilities functions collected in one file named adesub.c, with adesub.h headers file. From what I understand, during package compilation these functions are added to the ade4 shared library and they can be called by my other C functions without being declared in the init.c or NAMESPACE files, as they do not need to be known by R.
> 
> I would like to know if it is possible to do the same thing in C++ with Rcpp.
If I understand correctly you goal, just don't put "// [[Rcpp::export]]" 
before your "internal" functions. They will be available to all C and 
C++ functions in src/ but not seen in R. You don't need extra "R CMD 
SHLIB" either.

Best,
Serguei.

  I have found reading the documentation (Dirk's book and Rcpp 
vignettes) that I could use R CMD SHLIB to build a shared library and 
then dyn.load it in R. I have created a file named ade4lib.cpp 
containing the utilities functions in the src directory, and I can make 
the shared library (ade4lib.so) with RCMD SHLIB. But this does not solve 
my problem because, as I understand it, this makes the utilities library 
functions available to R (which is useless since they are not interfaced 
correctly to R but to C++), and not to the other C++ functions (which is 
what i need to do).
> 
> Can anybody see where I am mistaken, and point me to the right direction to accomplish this ?
> 
> Thank you,
> Jean
> 
> —-
> Jean THIOULOUSE - https://lbbe-web.univ-lyon1.fr/en/annuaires-des-membres/thioulouse-jean
> https://orcid.org/0000-0001-7664-0598 (ORCID page)
> https://www.springer.com/fr/book/9781493988488 (ade4 Book)
> https://pbil.univ-lyon1.fr/JTHome/Biblio/ThioulouseEB2021.pdf (Evol. Biol. paper)
> 
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