Dear Rcpp-Devels, List, I'm struggling with building a Rcpp package linking to the NLopt library (*http://ab-initio.mit.edu/wiki/index.php/NLopt <http://ab-initio.mit.edu/wiki/index.php/NLopt>*).
I'm on Windows and I've the following files in \src: - Makevars.in - Makevars.win - Rcpp_project_test.cpp - RcppExports.cpp - nlopt.h - nlopt.hpp - libnlopt-0.lib - libnlopt-0.def - libnlopt-0.a - libnlopt-0.dll where I've copied the .lib (built using MinGW) and dll files to the src folder in the hope that R would compile them itself. That doesn't seem to be the case, however, and for that reason I've added a Makevars file where I try to link to the library. When running 'Build&Reload' from RStudio, I get the following error message telling me that there is a problem with linking (cf. "undefined reference"): *Multithreaded BLAS/LAPACK libraries detected. Using 4 cores for math algorithms.* ** installing to library 'C:/Users/g49128/Documents/R/win-library/3.2'* ** installing *source* package 'NewPackage' ...* *g++ -m64 -I"C:/PROGRA~1/R/R-32~1.2/include" -DNDEBUG -Inlopt-2_4 -g -O1 -I"C:/Users/g49128/Documents/R/win-library/3.2/Rcpp/include" -I"c:/applications/extsoft/include" -O2 -Wall -mtune=core2 -c RcppExports.cpp -o RcppExports.o* *** libs* *g++ -m64 -I"C:/PROGRA~1/R/R-32~1.2/include" -DNDEBUG -Inlopt-2_4 -g -O1 -I"C:/Users/g49128/Documents/R/win-library/3.2/Rcpp/include" -I"c:/applications/extsoft/include" -O2 -Wall -mtune=core2 -c Rcpp_project_test.cpp -o Rcpp_project_test.o* *Rcpp_project_test.cpp:17:0: warning: "PI" redefined [enabled by default]* *C:/PROGRA~1/R/R-32~1.2/include/R_ext/Constants.h:32:0: note: this is the location of the previous definition* *Multithreaded BLAS/LAPACK libraries detected. Using 4 cores for math algorithms.* *g++ -m64 -shared -s -static-libgcc -o NewPackage.dll tmp.def RcppExports.o Rcpp_project_test.o -Lnlopt-2_4/libnlopt-0.a -Lc:/applications/extsoft/lib/x64 -Lc:/applications/extsoft/lib -LC:/PROGRA~1/R/R-32~1.2/bin/x64 -lR* *Multithreaded BLAS/LAPACK libraries detected. Using 4 cores for math algorithms.* *Rcpp_project_test.o: In function `opt':* *C:\Temp\R\Rcpp\NewPackage\src/nlopt.hpp:274: undefined reference to `__imp_nlopt_create'* *C:\Temp\R\Rcpp\NewPackage\src/nlopt.hpp:279: undefined reference to `__imp_nlopt_set_munge'* *Rcpp_project_test.o: In function `~opt':* *C:\Temp\R\Rcpp\NewPackage\src/nlopt.hpp:272: undefined reference to `__imp_nlopt_destroy'* *C:\Temp\R\Rcpp\NewPackage\src/nlopt.hpp:272: undefined reference to `__imp_nlopt_destroy'* *collect2: ld returned 1 exit status* I suspect that I haven't got the Makevars right, not so well versed in those. From reading several CRAN packages, in particular nloptr, my current best guess on the content of both Makevars files is: *PKG_CPPFLAGS = -Inlopt-2_4 -g -O1 * *PKG_LIBS = `$(R_HOME)/bin/Rscript -e "Rcpp:::LdFlags()"` -Llibnlopt-0.lib* Could anyone tell me what I'm missing here? Any help would be much appreciated, thank you. Best Regards, Jens Christian
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