[fpc-pascal]linking pascal objects/units into C

Oliver Graf ograf at oli-ver-ena.de
Mon Jun 18 13:50:58 CEST 2001

Hi myself!

On Mon, Jun 18, 2001 at 12:43:50PM +0200, Oliver Graf wrote:
> We have a pretty old pascal project (delphi 1 on win95 -- already
> ported) and we need to interface it with various script languages
> (python, perl, etc.). So we need to link the pascal units to some
> C interfacing code for those script languages.
> Has anyone done this before and can provide us with some hints how
> to archive this (i.e. creating a C header for the unit, calling
> conventions, argument passing)?
> Target system is linux.

This now breaks down to: which fpc runtime libs do I need to link
(basically) to a C programm which uses a pascal unit? I've added
rtl/libsyslinux.a and rtl/libsysutils.a, but _haltproc and INITFINAL
(used in libsyslinux.a) are still missing.


compile unit with 'fpc test'

try to compile C with 'gcc test.c test.o /usr/lib/fpc/1.0.4/units/linux/rtl/libsysutils.a /usr/lib/fpc/1.0.4/units/linux/rtl/libsyslinux.a -o doittest'

Any hints?


-+-+-+ test.pas
unit test;


procedure doit(i : integer); cdecl;


procedure doit(i : integer); cdecl; export;

   writeln('Hello World!');
end; { doit }


-+-+-+ test.h
void doit(int i);

-+-+-+ test.c
#include <stdio.h>

#include "test.h"

int main(int argc, char **argv) {
  return 0;

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