[R-pkg-devel] Linking to C library from within R package - library not loaded error

[Satyaprakash Nayak]

Hi

I am trying to develop a package which links against a C library which is
installed on my system (Mac OSX) in the /usr/local/lib directory.

The C library against which I am linking is called 'Sundials
<http://computation.llnl.gov/projects/sundials-suite-nonlinear-differential-algebraic-equation-solvers>'
(an efficient solver for large scale ordinary differential/algebraic
equations) and the specific error I get when I perform 'clean and rebuild`
in RStudio, I get the following error

Library not loaded: libsundials_nvecserial.0.dylib


The Makevars is as follows

PKG_CPPFLAGS= -I../inst/include/ -I src/sundials
> PKG_LIBS= $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS) -L/usr/local/lib
> -lsundials_nvecserial -lsundials_cvode -lm


Initially, I was thinking of building the library in the package itself so
that the users don't have to install `sundials` to use the package, but I
have abandoned that approach (for now) and I am now trying to link to the
libraries installed on the system. Currently, the package does not do
anything useful, I am just trying to allocate values to the N_VNew_Serial() (a
vector type defined by the sundials library), see -
https://github.com/sn248/Rcppsbmod/blob/pr/1/src/sundials_test.cpp

I have confirmed that /usr/local/lib does contain
libsundials_nvecserial.0.dylib

The source code for the entire package can be found at -
https://github.com/sn248/Rcppsbmod/tree/pr/1

In the interest of full disclosure, I have asked a similar question before
on StackOverflow also -
http://stackoverflow.com/questions/37819967/compiling-c-in-rcpp-with-external-c-library

and received comments that this is a linking error, not compilation.

To confirm that I have sundials installed and working on my laptop, I tried
to compile and link an example from the library using the command

gcc -Wall cvRoberts_dns.c -o cvRoberts_dns.exe -I/usr/local/include
-L/usr/local/lib/ -lsundials_cvode -lsundials_nvecserial -lm

and was able to run it successfully.

Any help in linking successfully to this library in my package would be
highly appreciated.
Thanks!
SN

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