[Rcpp-devel] Error linking: Undefined reference to...

[Bjørn Skogtrø]

Hi Dirk,

Thanks for the response - it was helpful.

I've added the library you suggested and the appropriate path, and now
linking is fine. For completeness, my makevars.win now looks like this:

## Use the R_HOME indirection to support installations of multiple R version
## PKG_LIBS = $(shell "${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" -e
"Rcpp:::LdFlags()")

PKG_LIBS = $("C:/PROGRA~1/R/R-2.13.1/library/Rcpp/lib/i386/libR.cpp.a")
PKG_LIBS+= -lRcpp
PKG_LIBS+= -LC:/PROGRA~1/R/R-213~1.1/library/Rcpp/libs/i386

Guess the approach can be prettified using the $(shell....) approach above
and regular expressions, but I'm no expert on this.

Thanks again!

BR,
Bjørn




2011/9/8 Dirk Eddelbuettel <edd at debian.org>

>
> Hi Bjørn,
>
> Welcome!
>
> On 8 September 2011 at 10:36, Bjørn Skogtrø wrote:
> | Hi guys.
> |
> | First off, thanks for a nice piece of software.
> |
> | Now to the issue at hand:
> |
> | I'm trying to compile and link the package obtained using
> Rcpp.package.skeleton
> | (...) (out of the box). I'm running R 2.13.1, with Rcpp 0.9.6 on a
> Windows XP
> | machine.
> |
> | The first problem I ran into was how the package-libs variable PKG_LIBS
> was
> | pasted into the g++ string for compiling:
> |
> | g++ -shared -s -static-libgcc -o processes.dll tmp.def rcpp_hello_world.o
> | rcpp_module.o C:/Program Files/R/R-2.13.1/library/Rcpp/lib/i386/libRcpp.a
> -LC:/
> | PROGRA~1/R/R-213~1.1/bin/i386 -lR
> | g++.exe: C:/Program: No such file or directory
> | g++.exe: Files/R/R-2.13.1/library/Rcpp/lib/i386/libRcpp.a: No such file
> or
> | directory
> | ERROR: compilation failed for package 'processes'
> | * removing 'D:/Documents/Eclipse/processes.Rcheck/processes'
> |
> | As you can see, paths with spaces in them is not cool.
>
> Correct. The shell / Makefile quoting gets in the way.
>
> If someone comes with _reliable ways to improve this_ we'd be open for
> patches. Until then the recommendation is to not use directories with
> spaces.
>
> | I resolved this by overriding it in makevars.win by hard-coding it, so my
> makevars.win looks like
>
> Good idea.
>
> | ## Use the R_HOME indirection to support installations of multiple R
> version
> | ## PKG_LIBS = $(shell "${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" -e
> | "Rcpp:::LdFlags()")
> | PKG_LIBS = $("C:/PROGRA~1/R/R-2.13.1/library/Rcpp/lib/i386/libRcpp.a")
> |
> | Compiling then works fine, and spits out the files rcpp_module.o and
> | rcpp_hello_world.o. The problem then is linking, which complains over
> | "undefined reference":
> |
> | * installing *source* package 'processes' ...
> | ** libs
> | cygwin warning:
> |   MS-DOS style path detected: C:/PROGRA~1/R/R-213~1.1/etc/i386/Makeconf
> |   Preferred POSIX equivalent is:
> /cygdrive/c/PROGRA~1/R/R-213~1.1/etc/i386/
> | Makeconf
> |   CYGWIN environment variable option "nodosfilewarning" turns off this
> | warning.
> |   Consult the user's guide for more details about POSIX paths:
> |     http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
> | g++ -shared -s -static-libgcc -o processes.dll tmp.def rcpp_hello_world.o
> | rcpp_module.o -LC:/PROGRA~1/R/R-213~1.1/bin/i386 -lR
> | rcpp_hello_world.o:rcpp_hello_world.cpp:(.text+0x66): undefined reference
> to
> | `Rcpp::RObject::setSEXP(SEXPREC*)'
> | rcpp_hello_world.o:rcpp_hello_world.cpp:(.text+0x71): undefined reference
> to
> | `void Rcpp::internal::r_init_vector<16>(SEXPREC*)'
> | rcpp_hello_world.o:rcpp_hello_world.cpp:(.text+0x148): undefined
> reference to
> | `Rcpp::RObject::setSEXP(SEXPREC*)'
> | rcpp_hello_world.o:rcpp_hello_world.cpp:(.text+0x1a7): undefined
> reference to
> | `Rcpp::RObject::setSEXP(SEXPREC*)'
> |
> | I'm assuming that these two errors are somewhat related, but can't figure
> it
> | out (the compile processs running R CMD check is a bit intransparent to
> me). I
> | should mention that this exact procedure worked fine until I upgraded
> from
> | 2.13.0 to 2.13.1 yesterday.
> |
> | Any clues on what to look at??
>
> Your PKG_LIBS appears to be wrong:
>
>   g++ -shared -s -static-libgcc -o processes.dll tmp.def rcpp_hello_world.o
>        rcpp_module.o -LC:/PROGRA~1/R/R-213~1.1/bin/i386 -lR
>
> You need a -L part for a location, as well as -l part giving a library, eg
>
>   g++ -shared -s -static-libgcc -o processes.dll tmp.def rcpp_hello_world.o
>         rcpp_module.o -LC:/PROGRA~1/R/R-213~1.1/bin/i386 -lRcpp -lR
>
> where I added -lRcpp.
>
> Hope this helps,  Dirk
>
> | Thanks!
> |
> | BR,
> | Bjørn
> |
> |
> | --
> | Up, down, turn around
> | Please dont let me hit the ground
> | Tonight I think Ill walk alone
> | Ill find my soul as I go home.
> |
> | ----------------------------------------------------------------------
> | _______________________________________________
> | Rcpp-devel mailing list
> | Rcpp-devel at lists.r-forge.r-project.org
> | https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
> --
> Two new Rcpp master classes for R and C++ integration scheduled for
> New York (Sep 24) and San Francisco (Oct 8), more details are at
>
> http://dirk.eddelbuettel.com/blog/2011/08/04#rcpp_classes_2011-09_and_2011-10
>
> http://www.revolutionanalytics.com/products/training/public/rcpp-master-class.php
>



-- 
Up, down, turn around
Please dont let me hit the ground
Tonight I think Ill walk alone
Ill find my soul as I go home.
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