Re: Compiling mex file using g++/MinGW

[david moloney]

please ignore

I installed the mingw version and everything works fine

-David

On Wed, Aug 28, 2013 at 6:43 AM, david moloney <address@hidden> wrote:

I've tried to compile the example from the Octave website 

http://www.gnu.org/software/octave/doc/interpreter/Getting-Started-with-Mex_002dFiles.html#Getting-Started-with-Mex_002dFiles

file mex_demo.c

  #include "mex.h"
     
     void
     mexFunction (int nlhs, mxArray *plhs[], int nrhs, 
                  const mxArray *prhs[])
     {
       mxArray *v = mxCreateDoubleMatrix (1, 1, mxREAL);
       double *data = "" (v);
       *data = ""
       plhs[0] = v;
     }

I didn't see an obvious way to configure mkoctfile to target g++/MinGW so I used the -p option to find out which environment variables to set and eventually got it to compile

Is there an easier way to configure mkoctfile I'm missing?

It also links after I hack the linker invocation (deduced using mkoctfile -v .mex_demo.c)

ld -shared  -o
mex_demo.mex  mex_demo.o -L"c:\Program Files (x86)\Octave-3.6.1\lib\octave\3.6.1" -L"c:\Program Files (x86)\Octave-3.6.1\lib" -loctinterp -loctave -lcruft

A mex file is created however when I type mex_demo() inside octave I get the following warning
octave-3.6.4.exe:10> mex_demo()
error: library open failed: c:\Users\david\Desktop\Work\flyby\mex_demo.mex
Any ideas?
Is it a problem with exporting symbols?
I had to remove -Wl,-export:mexFunction from the original ld invocation
ld -shared  -o mex_demo.mex  mex_demo.o   -Wl,-export:mexFunction -L"c:\Program Files (x86)\Octave-3.6.1\lib\octave\3.6.1" -L"c:\Program Files (x86)\Octave-3.6.1\lib" -loctinterp -loctave -lcruft
ld: unrecognized option '-Wl,-export:mexFunction'
ld: use the --help option for usage information
g++ version is 4.6.2
Thanks


-David