[Rcpp-devel] Symbol not found when including an external library

[Douglas Bates]

Do you know of the nloptr and nloptwrap R packages based on NLopt.  The
nloptr package installs the NLopt library.  Unfortunately it does not put
the header files in inst/include in the source package so they will be
available in the include subdirectory of the installed package.



On Wed, Sep 4, 2013 at 11:51 AM, Simon Zehnder <szehnder at uni-bonn.de> wrote:

> Dear Rcpp::Users, Rcpp::Devels,
>
> I am following the ongoing discussion 'How to use external C++ libraries
> in R packages withRcpp' (Makevars are still one of my weaknesses) and I
> have a related question.
>
> I am trying to use the C++ optimization library nlopt (
> http://ab-initio.mit.edu/wiki/index.php/NLopt) in my package that is
> based on RcppArmadillo. In a first step I installed nlopt in a subfolder of
> the 'src' folder of my package structure (so I have '/src/nlopt-2.3').
> Second, I included the header file into my source file right below
> '#include <RcppArmadillo.h>'. Then I set my Makevars file to:
>
> ## Use the R_HOME indirection to support installations of multiple R
> version
> NLOPT_VERSION = 2.3
>
> NLOPT_LIBS = -lm nlopt-${NLOPT_VERSION}/lib/libnlopt_cxx.a
>
> NLOPT_INCL = -I./nlopt-${NLOPT_VERSION}/include
>
> PKG_CPPFLAGS = ${NLOPT_INCL}
> PKG_CFLAGS = -pipe ${NLOPT_INCL}
> PKG_LIBS = `$(R_HOME)/bin/Rscript -e "Rcpp:::LdFlags()"` ${NLOPT_LIBS}
>
> Calling 'R CMD INSTALL packageName' compiles without errors but produces
> the well-known error during loading the shared library:
>
> Error in dyn.load(file, DLLpath = DLLpath, ...) :
>   unable to load shared object
> '/Library/Frameworks/R.framework/Versions/3.0/Resources/library/finmix/libs/finmix.so':
>
> dlopen(/Library/Frameworks/R.framework/Versions/3.0/Resources/library/finmix/libs/finmix.so,
> 6): Symbol not found: __ZNSt8__detail15_List_node_base11_M_transferEPS0_S1_
>
> I find the missing symbol (using 'nm -A libnlopt_cxx.a | grep "transfer"'
> on the shell) in the static library of nlopt (libnlopt_cxx.a) to which I
> link in the Makevars, but I do not know yet, how I have to modify the
> Makevars to include also the static library of nlopt into the shared
> library of my package. Does anyone have a suggestion how to do it?
>
>
> Best
>
> Simon
>
>
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