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

[Satyaprakash Nayak]

A quick update

The correct command to run the sundials example is

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

OR

gcc -Wall cvRoberts_dns.c -o cvRoberts_dns.exe
/usr/local/lib/libsundials_cvode.a /usr/local/lib/libsundials_nvecserial.a

also, the command

PKG_LIBS= $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)
/usr/local/lib/libsundials_cvode.a /usr/local/lib/libsundials_nvecserial.a

now works! So, linking to a static library works, but linking to the .so or
.dylib does not in this case.

Thanks

SN

On Wed, Jul 6, 2016 at 12:22 PM, Satyaprakash Nayak <sn248 at cornell.edu>
wrote:

> 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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