[Tutor] Compiling a program ::Embedding Python in C

[Shadab Sayani]

Hi,
I have a C program mm.c calling python function as
follows::
#include "Python.h"
#include <stdio.h>

int main(int argc, char* argv[])
{
        double answer = 0;
        PyObject *modname, *mod, *mdict, *func,
*stringarg, *args, *rslt;

        Py_Initialize();
    modname = PyString_FromString("Test");

    mod = PyImport_Import(modname);
        if (mod)
        {
                mdict = PyModule_GetDict(mod);
                func = PyDict_GetItemString(mdict,
"doit"); // borrowed reference
                if (func)
                {
                        if (PyCallable_Check(func))
                        {
                                stringarg =
PyString_FromString("5");//pay attention here
                                args = PyTuple_New(1);
                                PyTuple_SetItem(args,
0, stringarg);
                                rslt =
PyObject_CallObject(func, args);
                                if (rslt)
                                {
                                        answer =
PyFloat_AsDouble(rslt);
                                       
Py_XDECREF(rslt);
                                }
              Py_XDECREF(stringarg);
              Py_XDECREF(args);
                        }
                }

                Py_XDECREF(mod);
        }

        Py_XDECREF(modname);

        Py_Finalize();

        printf("%g",answer);

        return 0;
}

The python program -->(Test.py)
def doit(x1):
    try:
        x2 = eval(x1)
    except:
        print 'Error!'
        return 0

    else:
        return x2

COMPILING-->
I used this make file to compile the above program

OPT=-I/usr/local/include/python2.4/  -DHAVE_CONFIG_H
-D_THREAD_SAFE -pthread -pipe
mm: clean mm.o
        gcc $(OPT) -Wl.-E -o mm mm.o 
/usr/local/lib/python2.4/config/libpython2.4.a  -lm
mm.o: mm.c
        gcc $(OPT) -c mm.c
clean:
        rm -f *.o;rm -f *.so;rm -f *.core

But I got the following ERRORS-->
rm -f *.o;rm -f *.so;rm -f *.core
gcc -I/usr/local/include/python2.4/  -DHAVE_CONFIG_H
-D_THREAD_SAFE -pthread -pipe -c mm.c
gcc -I/usr/local/include/python2.4/  -DHAVE_CONFIG_H
-D_THREAD_SAFE -pthread -pipe -Wl.-E -o mm mm.o 
/usr/local/lib/python2.4/config/libpython2.4.a  -lm
/usr/local/lib/python2.4/config/libpython2.4.a(posixmodule.o)(.text+0x39a4):
In function `posix_tmpnam':
./Modules/posixmodule.c:6240: warning: the use of
`tmpnam_r' is dangerous, better use `mkstemp'
/usr/local/lib/python2.4/config/libpython2.4.a(posixmodule.o)(.text+0x3906):
In function `posix_tempnam':
./Modules/posixmodule.c:6195: warning: the use of
`tempnam' is dangerous, better use `mkstemp'
/usr/local/lib/python2.4/config/libpython2.4.a(dynload_shlib.o)(.text+0x15e):
In function `_PyImport_GetDynLoadFunc':
Python/dynload_shlib.c:130: undefined reference to
`dlopen'
/usr/local/lib/python2.4/config/libpython2.4.a(dynload_shlib.o)(.text+0x19f):Python/dynload_shlib.c:141:
undefined reference to `dlsym'
/usr/local/lib/python2.4/config/libpython2.4.a(dynload_shlib.o)(.text+0x1f6):Python/dynload_shlib.c:133:
undefined reference to `dlerror'
/usr/local/lib/python2.4/config/libpython2.4.a(posixmodule.o)(.text+0x1b49):
In function `posix_openpty':
: undefined reference to `openpty'
/usr/local/lib/python2.4/config/libpython2.4.a(posixmodule.o)(.text+0x1b93):
In function `posix_forkpty':
: undefined reference to `forkpty'
collect2: ld returned 1 exit status
make: *** [mm] Error 1

HOW TO FIX THESE and get a executable so that I can
directly run it?

Thanks and Regards,
Shadab.

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