[Scilab-users] Creating shared objects, using slepc, to work with scilab

[kichun]

Dear all,

I am using scilab on ubuntu, and now I'm strugling to make use of SLEPc
(http://www.grycap.upv.es/slepc/) in scilab. I did manage to compile some
simple codec in c into shared objects and then succesfully link them to
scilab, but in this case it is more complicated. To compile ***.c files,
which refer to SLEPc library I have to (accordingly to official SLEPc
website) make a simple makefile, like this:

hello: hello.o chkopts
        -${CLINKER} -o hello hello.o ${SLEPC_LIB}
        ${RM} hello.o
include ${SLEPC_DIR}/conf/slepc_common

where hello.c is:

static char help[] = "Simple Hello World example program in SLEPc\n";

#include "slepceps.h"

#undef __FUNCT__
#define __FUNCT__ "main"
int main( int argc, char **argv )
{
  int ierr;

  SlepcInitialize(&argc,&argv,(char*)0,help);
  ierr = PetscPrintf(PETSC_COMM_WORLD,"Hello world\n");CHKERRQ(ierr);
  ierr = SlepcFinalize();CHKERRQ(ierr);
  return 0;
}

and this basically works. I also tried more complex codes, and they compile
and execute as well.

Now I would like to write a function using SLEPc, that could be called from
Scilab. At first, the simpliest possible is enough, so i changed the hello.c
and the makefile:

hello: hello.o chkopts
        gcc -shared -fPIC -o hello.so ${SLEPC_LIB}
include ${SLEPC_DIR}/conf/slepc_common


hello.c:

static char help[] = "Simple Hello World example program in SLEPc\n";

#include "slepceps.h"

void hello( int n)
{
  int ierr;
  int i;
  int **argc;
  char **argv;
  char dupa;
  i=0;
  argc=i;
  dupa=' ';
  argv=dupa;
  SlepcInitialize(&argc,&argv,(char*)0,help);
  for(i=0;i<n;i++){
  ierr = PetscPrintf(PETSC_COMM_WORLD,"Hello world\n");CHKERRQ(ierr);
  }
  ierr = SlepcFinalize();CHKERRQ(ierr);
}


and that runs well (i mean "make hello"), but Scilab can't link it. After
running "link('./hello.so','hello','c')" I get:

Shared archive loaded.
Link done.
hello is not an entry point.
                               !--error 235
link: problem with one of the entry point.

and i have no idea what to do:(

Please help me if you can, this is very important for me!

Cheers,
Michael



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