Re: [Swig-user] Fwd: Using SWIG with R

[William S F. <ws...@fu...>]

John Hayes wrote:
> On Oct 3, 2009, at 6:26 AM, Nathan Harmston wrote:
> 
>> Hi,
>>
>> I am trying to get SWIG to run to interface some C++ and and R code,
>> but I am having a lot of problems. So looking at the tutorial at
>> http://www.swig.org/Doc1.3/R.html
>> I m using SWIG Version 1.3.31
>> Is SWIG still maintained for use with R?
>>
>> I am able to run SWIG directly using
>>
>> swig -c++ -r -o bootstrap_wrap.c bootstrap.i
>>
>> which seems to generate the correct files, then I try
>> PKG_LIBS="bootstrap.cpp" R CMD SHLIB bootstrap_wrap.cpp
>>
>> and all I seem to get is a
>> gcc -arch i386 -std=gnu99
>> -I/Library/Frameworks/R.framework/Resources/include
>> -I/Library/Frameworks/R.framework/Resources/include/i386
>> -I/usr/local/include    -fPIC  -g -O2 -c bootstrap_wrap.c -o
>> bootstrap_wrap.o
>> bootstrap_wrap.c: In function ‘R_SWIG_pushCallbackFunctionData’:
>> bootstrap_wrap.c:759: warning: implicit declaration of function  
>> ‘calloc’
>> bootstrap_wrap.c:759: warning: incompatible implicit declaration of
>> built-in function ‘calloc’
>> bootstrap_wrap.c: In function ‘R_SWIG_popCallbackFunctionData’:
>> bootstrap_wrap.c:800: warning: implicit declaration of function ‘free’
>> bootstrap_wrap.c: In function ‘RSwigPacked_New’:
>> bootstrap_wrap.c:1000: warning: implicit declaration of function  
>> ‘malloc’
>> bootstrap_wrap.c:1000: warning: incompatible implicit declaration of
>> built-in function ‘malloc’
>> bootstrap_wrap.c:1194:21: error: stdexcept: No such file or directory
>> make[1]: *** [bootstrap_wrap.o] Error 1
>>
>>
>> So how can I compile this correctly is there something in my path
>> wrong? or the setup of SWIG is wrong? Is there a better tutorial for
>> using R with SWIG than the one above.
>>
>> Many thanks
>> Nathan
>>
> 
> I've never used swig with R but I think the problem is the output file  
> name.  You're telling SWIG to make C++ bindings but you're saving it  
> into a C file.

Here is a working version of one of the classic c++ examples which you 
should be able to repeat:

william@caracal:~/swig/trunk$ cd Examples/r/class/
william@caracal:~/swig/trunk/Examples/r/class$ make check
make -f ../../Makefile CXXSRCS='example.cxx' SWIG='../../../preinst-swig' \
	TARGET='example' INTERFACE='example.i' r_cpp
make[1]: Entering directory `/home/william/swig/trunk/Examples/r/class'
../../../preinst-swig -c++ -r  -o example_wrap.cpp  example.i
( PKG_LIBS="example.cxx" PKG_CPPFLAGS=""  R CMD SHLIB -o example.so 
example_wrap.cpp  )
make[2]: Entering directory `/home/william/swig/trunk/Examples/r/class'
g++ -I/usr/share/R/include      -fpic  -g -O2 -c example_wrap.cpp -o 
example_wrap.o
g++ -shared  -o example.so example_wrap.o example.cxx  -L/usr/lib/R/lib -lR
make[2]: Leaving directory `/home/william/swig/trunk/Examples/r/class'
make[1]: Leaving directory `/home/william/swig/trunk/Examples/r/class'
R CMD BATCH runme.R
william@caracal:~/swig/trunk/Examples/r/class$

The output after running is in runme.Rout.

William