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Date: -- (:)
From: matthieu.dubuget@libertysurf.fr <matthieu.dubuget@l...>
Subject: [Caml-list] linking_problem_with_camlidl_on_windows
Hello!

I posted a question some days ago, but it was not very precise.

I am trying to use one DLL from Ocaml with camlidl.

Since I can't have this work on windows (no problem under
linux) because of linking problems, I reproduced it there.

There are 4 files :
somme.c, somme.def, somme.idl, somme_stubs.def

**** somme.c ****
#include "somme.h"

char * toto[3] = { "un", "deux", "trois" };

handle get(int indice){
  return toto[indice];
}

char * string_of_handle(handle h){
  return (char *) h;
}
**** somme.c ****
**** somme.def *****
EXPORTS
    get
    string_of_handle
**** somme.def *****

Here is the somme.idl file :

**** somme.idl ****
typedef [abstract] char *  handle;

handle get([in] int indice);

[string] char * string_of_handle([in] handle h);
**** somme.idl ****
**** somme_stubs.def ****
EXPORTS
    camlidl_somme_get
    camlidl_somme_string_of_handle
**** somme_stubs.def ****

Here are the steps (*files are the 4 hand-written files):

                           
*somme.def|-3->somme.dll|-5->somme_stubs.dll
               *somme.c|-2-> somme.obj|             |
*somme.idl-1->|somme.h                              |
              |somme_stubs.c-4->    somme_stubs.obj |
              |                    *somme_stubs.def |
              |somme.ml
              |somme.mli

1/ ocamlidl -header somme.idl
2/ cl /c somme.c
3/ link /dll /out:somme.dll /def:somme.def somme.obj
4/ ocamlc -c somme_stubs.c

5/  Here is the step I cannot pass, because there are always
unresolved external symbols. I cannot guess which library I
should link? Is it possible that I made something wrong when
installing camlidl?

FIRST TRY:
link /dll /out:somme_stubs.dll /def:somme_stubs.def
somme_stubs.obj somme.lib
Microsoft (R) Incremental Linker Version 6.00.8168
Copyright (C) Microsoft Corp 1992-1998. All rights reserved.

   Creating library somme_stubs.lib and object somme_stubs.exp
somme_stubs.obj : error LNK2001: unresolved external symbol
_alloc
somme_stubs.obj : error LNK2001: unresolved external symbol
_camlidl_free
somme_stubs.obj : error LNK2001: unresolved external symbol
_copy_string
somme_stubs.dll : fatal error LNK1120: 3 unresolved externals

SECOND TRY (worse):
link /dll /out:somme_stubs.dll /def:somme_stubs.def
somme_stubs.obj somme.lib /libpath:"c:/ocaml/lib" libcamlidl.lib
Microsoft (R) Incremental Linker Version 6.00.8168
Copyright (C) Microsoft Corp 1992-1998. All rights reserved.

   Creating library somme_stubs.lib and object somme_stubs.exp
somme_stubs.obj : error LNK2001: unresolved external symbol
_alloc
somme_stubs.obj : error LNK2001: unresolved external symbol
_copy_string
libcamlidl.lib(idlalloc.obj) : error LNK2001: unresolved
external symbol _invalid_argument
libcamlidl.lib(idlalloc.obj) : error LNK2001: unresolved
external symbol _alloc_small
libcamlidl.lib(idlalloc.obj) : error LNK2001: unresolved
external symbol _local_roots
libcamlidl.lib(idlalloc.obj) : error LNK2001: unresolved
external symbol _stat_alloc
libcamlidl.lib(idlalloc.obj) : error LNK2001: unresolved
external symbol _raise_out_of_memory
libcamlidl.lib(idlalloc.obj) : error LNK2001: unresolved
external symbol __imp__CoTaskMemAlloc@4
libcamlidl.lib(idlalloc.obj) : error LNK2001: unresolved
external symbol __imp__CoTaskMemFree@4
libcamlidl.lib(idlalloc.obj) : error LNK2001: unresolved
external symbol _stat_free
libcamlidl.lib(idlalloc.obj) : error LNK2001: unresolved
external symbol _string_length
somme_stubs.dll : fatal error LNK1120: 11 unresolved externals
NMAKE : fatal error U1077: 'link' : return code '0x460'
Stop.

COMMENTS:
I did the same thing on linux and it worked fine.
I did it with a simpler idl file on windows (without
abstract type definition) and it worked too.

Where am I wrong ?

Thanks in advance

Matthieu Dubuget


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