From:	Joseph Rose <jorose AT mail DOT gis DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: 3rd Try: Maybe an asm problem? (Problems linking)
Date:	Fri, 28 Apr 2000 14:32:11 -0400
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Lines:	42
Message-ID:	<3909D92B.CC80284C@pop.gis.net>
References:	<200004281112 DOT NAA29833 AT acp3bf DOT physik DOT rwth-aachen DOT de>
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Just before my last message, I put 'extern' before the prototypes of the asm
functions in my header.  I forgot to post the header.  It follows.

-----------------------
/*
//Header for VGADr386 library.
//Requires dpmi.h.
*/
#ifndef _VGADraw_internal
 extern short VidSel;
 extern __dpmi_paddr VidBuffer;
 extern char TmpVidBuffer [63999];
#endif
 extern void SetGrMode (void);
 extern void Draw_Line_Horiz (int X, int Y, int Len, char Col);
 extern void Draw_Line_Vert (long X, long Y, short Len, char Col);
 extern void Draw_Tri (long X1, long Y1, long X2, long Y2, long X3, long Y3,
char Col);

--------------------------------

Hans-Bernhard Broeker wrote:

> In article <39096460 DOT 1D069B39 AT pop DOT gis DOT net> you wrote:
> > When I link the test code for my graphics library, I get no error
> > message on references to C++ functions, but I get 'undefined reference'
> > error messages at every line of C++ code containing a function call to
> > an assembler routine.  I'm using nasm; GLOBAL statements appear at the
> > beginning of the source for about every function in the source without
> > any extra specifiers, and my functions start with just a label followed
> > by a colon.  Every other technique I've tried didn't assemble at all.
>
> Unless my memory fails me even more badly than usually, I've already
> answered that question, answering an earlier posting of yours:
>
>         You need 'extern "C"' qualifiers in the prototypes for those
>         assembly functions.
>
> --
> Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
> Even if all the snow were burnt, ashes would remain.

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