[Rcpp-devel] NLopt linking problem

[Dirk Eddelbuettel]

Jens,

On 26 April 2016 at 17:22, Jens Johannsen wrote:
| 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).

Before we get any further, is there a reason you are NOT using the CRAN
package doing this for you (and where I helped some with the build system):

    https://cloud.r-project.org/web/packages/nloptr/index.html

It provides a Windows binary as well as well-working build recipe as can be
expected from a CRAN package.

Dirk

| 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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http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org