From: Joseph Rose <jorose AT mail DOT gis DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Problems linking
Date: Wed, 12 Apr 2000 04:53:37 -0400
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Message-ID: <38F43991.76768916@pop.gis.net>
References: <38F3E260 DOT B762A9E AT pop DOT gis DOT net>
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To: djgpp AT delorie DOT com
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I used the default options, except I played around with the "-ansi" (I
turned it back off.) and one or two other C compiler options
("-fallow-float") and the nasm options (ended up with conditional-assembly
options selected via -D and otherwise the defaults).  I tried treating the
library as a library; I changed the output, include and sources directories
to the directory containing the library and test code, and as far as I
remember, the other options are cosmetic.

BTW, can I set a custom text mode in DJGPP?  I found the options, but
"other" seems to get the last screen mode selected
.
Joseph Rose wrote:

> I'm creating a library of graphics functions with headers, and ran into
> a problem.  I wrote some code to test the library, and couldn't call the
> functions.  I get an "undefined reference" error at each function call.
> Am I doing something wrong?
>
> BTW, Can I include separate asm code in a C++ class?
> --------------------
> header:
>
> /*
> //Header for VGADr386 library.
> //Requires dpmi.h.
> */
>
>  __dpmi_paddr VidBuffer;
>  char TmpVidBuffer [64000];
>  extern void SetGrMode (void);
>  extern void Draw_Line_Horiz (int X, int Y, int Len, char Col);
>  void Draw_Line_Vert (long X, long Y, short Len, char Col);
>  void Draw_Tri (long X1, long Y1, long X2, long Y2, long X3, long Y3,
> char Col);
>
> ----------------------------
> TestGr:
>
> #include <dos.h>
> #include <dpmi.h>
> #include <VGADr386.h>
>
> /*using namespace Graphics_2D;*/
> int main (void)
> {
>  int A;
>  union REGS Reg;
> /* Reg.w.ax=0x13;
>  int86 (0x10,&Reg,&Reg);
>  __asm ("movw %ax,0x13");
>  __asm ("int 0x10");*/
>  SetGrMode();
>  printf ("","Test");
>  Draw_Line_Horiz (0, 10, 32, 15);
>  Draw_Line_Horiz (2,20,32,15);
> /* Draw_Line_Horiz(310,30,32,15);
>  Draw_Tri (160,100,200,150,180,140,15);*/
>  sleep (3);
>  Reg.w.ax=0x3;
>  int86 (0x10,&Reg,&Reg);
>  return 0;
> };