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From: "Anthony" <akantsel AT integra DOT rmt DOT ru>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Problem with Allegro and DzComm (long post)
Date: Thu, 1 Apr 2004 17:16:04 +0400
Organization: Radio-MSU NOC, Moscow State University
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"Andris Pavenis" <pavenis AT latnet DOT lv> ???????/???????? ? ???????? ?????????:
news:200404010825 DOT 27593 DOT pavenis AT latnet DOT lv...
> On Wednesday 31 March 2004 14:17, Anthony wrote:

> It's in DZCOMM documentation (it was not read carefully enough):
> --------------------  fragment from documentation ----------
> To use dzcomm in your code you will need to put
>
>
>       #include <dzcomm.h>
>
>
> in your code. Obviously (I hope) this will only work after you've
installed
> the library. If you wish to use allegro alongside dzcomm you will need to
> include the allegro library. If you do so it is IMPERATIVE that you
include
> allegro first (this how dzcomm knows where to link to):
>
>       #include <allegro.h>
>       #include <dzcomm.h>

This is how I put it.

>
>
>
>  If you have more than one C file in a project and you wish to access
dzcomm
> from more than one of those files, you must put the following #define
before
> all but one of the dzcomm includes:
>
>       #define DZCOMM_SECONDARY_INCLUDE
>       #include <dzcomm.h>

As it is clear from fragments of code above, I use #include <dzcomm.h> only
once in my program. Anyway, I've tried to put
#define DZCOMM_SECONDARY_INCLUDE
before #include "C306th.h" in all my files, just in case. It didn't help.
I've read DZComm manual carefully enough and didn't brake it's instructions,
I belive.
By the way, I've got this from allegro mailing list:

> int main()
> {
> ...
>     LOCK_VARIABLE(tick);
>     LOCK_FUNCTION(tick_handler);  // error: invalid convertion from 'void
> (*)()' to 'void*' ...
> }
>
> If I comment the #include <dzcomm.h> string (and remove everything related
> to dzcomm, the code compiles just fine. What can be the case?

I guess DzComm redefines the LOCK_FUNCTION macro without putting the
appropriate cast for C++.  This is a DzComm bug.  You can probably fix it by
locating the redefinition in dzcomm.h and replacing it by the definition
from allegro/include/allegro/platform/aldjgpp.h.

....
> `_dzdos_i nstall_param_int'
> c:/djgpp/tmp/cctwBPwX.o(.text+0x3e):C306th.cpp: first defined here
> c:/djgpp/tmp/ccId1w5b.o(.text+0x5a):thermo.cpp: multiple definition of
> `_dzdos_r emove_param_int'
> c:/djgpp/tmp/cctwBPwX.o(.text+0x5a):C306th.cpp: first defined here
> collect2: ld returned 1 exit status
>
> What am I doing wrong?

I guess it's a problem with 'extern inline' and C++: 'extern inline' is a C
idiom that is roughly equivalent to using a macro while it doesn't behave
the same in C++.

You will probably have to borrow the following trick from Allegro:

#ifdef __cplusplus
#define AL_INLINE(type, name, args, code)   static inline type name args
code
#else
#define AL_INLINE(type, name, args, code)   extern inline type name args
code
#endif
#endif


The bottom line appears to be that DzComm is not C++ compatible.

--
Eric Botcazou

I'll try it in a few days.
Anthony.