Embedded python fails to compile on Raspberry Pi

[tryfon]

Hi all!

I installed python 3.9.1 on my Raspberry Pi following the instructions here and set it as the default python interpreter. I got my compiling and linking parameters for embedded Python following the instructions here

I tried a simple test with the following code (test.c) :

int
main(int argc, char *argv[])
{
    wchar_t *program = Py_DecodeLocale(argv[0], NULL);
    if (program == NULL) {
        fprintf(stderr, "Fatal error: cannot decode argv[0]\n");
        exit(1);
    }
    Py_SetProgramName(program);  /* optional but recommended */
    Py_Initialize();
    PyRun_SimpleString("from time import time,ctime\n"
                       "print('Today is', ctime(time()))\n");
    Py_Finalize();
    PyMem_RawFree(program);
    return 0;
}

and then

gcc -I/usr/local/opt/python-3.9.1/include/python3.9 -I/usr/local/opt/python-3.9.1/include/python3.9 -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -c test.c -o test.o

and

gcc -L/usr/local/opt/python-3.9.1/lib/python3.9/config-3.9-arm-linux-gnueabihf -L/usr/local/opt/python-3.9.1/lib -lcrypt -lpthread -ldl -lutil -lm -o test.o

and got

Error:
/usr/lib/gcc/arm-linux-gnueabihf/4.9/../../../arm-linux-gnueabihf/crt1.o: In function '_start':
/build/glibc-P1SmLh/glibc-2.19/csu/../ports/sysdeps/arm/start.S:119: undefined reference to 'main'
collect2: error: ld returned 1 exit status

Trying to compile the example over here throws the same error. What could the problem be?