Many thanks for your comments. I have now set the value of the system environment variable NLOPT_HOME to the location of the NLopt library (this location is the /src folder of my package directory), and changed the Makevars.win (guess this is the only relevant Makevars file as the package will only be used on Windows) file to:
*PKG_CFLAGS = -I"$(NLOPT_HOME)"* *PKG_LIBS = -L"$(NLOPT_HOME)/libnlopt.a"* as James suggested, and which is also how it is done in the nloptr package that I'm able to build on my machine. *[ Note that the name of the library is 'libnlopt.a' and not 'lnlopt_cxx'. Furthermore, if I do this:* *PKG_LIBS = -L"$(NLOPT_HOME)" -libnlopt.a* *the R compiler immediately complains that it cannot find -libnlopt.a:* *g++ -m64 -I"C:/PROGRA~1/R/R-32~1.2/include" -DNDEBUG -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* *g++ -m64 -shared -s -static-libgcc -o NewPackage.dll tmp.def RcppExports.o Rcpp_project_test.o -Lc:/Temp/R/Rcpp/NewPackage/src -libnlopt.a -Lc:/applications/extsoft/lib/x64 -Lc:/applications/extsoft/lib -LC:/PROGRA~1/R/R-32~1.2/bin/x64 -lR* *c:/program files/rtools/gcc-4.6.3/bin/../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -libnlopt.a ]* In Rcpp_project_test.cpp, I remember to include the headers nlopt.hpp and nlopt.h. And the .cpp file runs fine when using it with the Visual Studio tools. Despite this, however, I still cannot link to the library. I get the following error: *g++ -m64 -shared -s -static-libgcc -o NewPackage.dll tmp.def RcppExports.o Rcpp_project_test.o -Lc:/Temp/R/Rcpp/NewPackage/src/libnlopt.a -Lc:/applications/extsoft/lib/x64 -Lc:/applications/extsoft/lib -LC:/PROGRA~1/R/R-32~1.2/bin/x64 -lR* *Rcpp_project_test.o:Rcpp_project_test.cpp:(.text+0x73c): undefined reference to `__imp_nlopt_create'* Thus, the linking to the static library nlopt that I created (using the instructions given here: http://ab-initio.mit.edu/wiki/index.php/NLopt_on_Windows) still does not work. I have a feeling that this is something quite simple to do, but I just cannot figure it out. Any further suggestion to what I can do to fix this issue? Thanks, Best Regards, Jens Christian On Tue, Apr 26, 2016 at 6:23 PM, Dirk Eddelbuettel <e...@debian.org> wrote: > > Hi Jens, > > On 26 April 2016 at 17:50, Jens Johannsen wrote: > | I'm aware of the nloptr CRAN package, but not using that package as the > | objective function (and gradient) being optimized as to be in C++. > Defining the > | function in R and then calling back and forth between R and C++ using > the > | nloptr package is too costly time-wise. > > That's not the point I was trying to make. My point was that _the package > shows how to build on all supported platforms_ and hence provides an > "existence proof". So you should download _it_ and see if you can build it. > You should be able too---and then be able to carry what it does over to > your > project. > > And as James said by now too, it may be as simple as setting the required > env > var. > > Cheers, Dirk > > -- > http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org >
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