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From:	"Anthony" <akantsel AT integra DOT rmt DOT ru>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Problem with Allegro and DzComm
Date:	Wed, 31 Mar 2004 15:17:43 +0400
Organization:	Radio-MSU NOC, Moscow State University
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Hello!
I'm experiencing problems with Allegro 4.1.12 + DzComm 0.9.9g programming.

#include <allegro.h>
#include <dzcomm.h>
...
comm_port *port;
volatile int tick;
void tick_handler()
{
    ++tick;
}
END_OF_FUNCTION(tick_handler);
...
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?

Also I have a small test program that uses dzcomm with no allegro. While it
is a single file, it works fine. If I split it into two files, I'm not able
to link it:

in file c306th.h:
#ifndef _CENTER_306_THERMOMETR_H_
#define _CENTER_306_THERMOMETR_H_

#include <stdexcept>
#include <dzcomm.h>
...
#endif

in file c306th.cpp:
#include "C306th.h"
...

in file thermo.cpp:
#include <iostream>
#include <iomanip>
#include "C306th.h"
...

Then
C:\DJGPP\MyProjects\Thermo>gpp -Wall C306th.cpp thermo.cpp -o
thermo.exe -ldzcom

c:/djgpp/tmp/ccId1w5b.o(.text+0x0):thermo.cpp: multiple definition of
`__dzdos_i
nstall_irq'
c:/djgpp/tmp/cctwBPwX.o(.text+0x0):C306th.cpp: first defined here
c:/djgpp/tmp/ccId1w5b.o(.text+0x1a):thermo.cpp: multiple definition of
`__dzdos_
remove_irq'
c:/djgpp/tmp/cctwBPwX.o(.text+0x1a):C306th.cpp: first defined here
c:/djgpp/tmp/ccId1w5b.o(.text+0x30):thermo.cpp: multiple definition of
`_dzdos_i
nstall_timer'
c:/djgpp/tmp/cctwBPwX.o(.text+0x30):C306th.cpp: first defined here
c:/djgpp/tmp/ccId1w5b.o(.text+0x3e):thermo.cpp: multiple definition of
`_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 would appreciate any help a lot.
Thanks.
Anthony

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