[Rcpp-devel] Rcpp shared libraries (?)

[THIOULOUSE JEAN]

> Le 23 juin 2022 à 16:58, Serguei Sokol <serguei.sokol at gmail.com> a écrit :
> 
> Rcpp or plain C++ or even C ;) , you still have to declare used functions.
> In Rcpp package, the most natural way to do it, is to put such declarations in a file $pkg/inst/include/<pkg_name>.h. In your case, it will be inst/include/ade4.h
> 
> In this file you put:
> 
> #include <RcppArmadillo.h>
> int matcentrageCpp (arma::mat& A, const arma::vec& poili, const int typ);
> 
> and all other functions of yours you plan to use in a cross-file way.
> Then, in a file where you want to use such functions (e.g. in testertracenuCpp.cpp), you add
> 
> #include <ade4.h>
> 
> Finally, you add the following line in your src/Makevars:
> 
> PKG_CPPFLAGS = -I../inst/include
> 
> After all this, I've got a compilation without error.
> I can make a PR if you wish.

Yes, please do. Thanks a lot !

> Best,
> Serguei.
> 
> Le 23/06/2022 à 16:10, Jean Thioulouse a écrit :
>>> Le 23 juin 2022 à 16:04, Serguei Sokol <serguei.sokol at gmail.com> a écrit :
>>> 
>>> Le 23/06/2022 à 15:47, Jean Thioulouse a écrit :
>>>> Thank you Serguei, I tried this, but I still get the "undeclared identifier" error for these internal functions during package compilation:
>>>> clang++ -arch arm64 -std=gnu++14 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG  -I'/Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/library/Rcpp/include' -I'/Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/library/RcppArmadillo/include' -I/opt/R/arm64/include   -fPIC  -falign-functions=64 -Wall -g -O2  -c testertracenuCpp.cpp -o testertracenuCpp.o
>>>> testertracenuCpp.cpp:112:9: error: use of undeclared identifier 'matcentrageCpp'
>>>>     i = matcentrageCpp (ti1p, pl, typ1);
>>> I cannot find 'matcentrageCpp' in https://github.com/sdray/ade4/tree/ade4-Rcpp/. Do you have a current state example somewhere?
>> Yes, I just pushed it in the ade4-Rcpp branch.
>>> 
>>> Serguei.
>>> 
>>>>         ^
>>>> Jean
>>>>> Le 23 juin 2022 à 15:17, Serguei Sokol <serguei.sokol at gmail.com> a écrit :
>>>>> 
>>>>> 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)
>>>>>> _______________________________________________
>>>>>> Rcpp-devel mailing list
>>>>>> Rcpp-devel at lists.r-forge.r-project.org
>>>>>> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
>>>>> 
>>> 
>