Message-ID:	<3BB8EEB7.23B6D3C7@mail.rosecom.ca>
From:	April <awhite AT mail DOT rosecom DOT ca>
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Subject:	using rsxntdj to create a dll for use with MS VB
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Date:	Mon, 01 Oct 2001 18:31:19 -0400
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To:	djgpp AT delorie DOT com
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version:

Reading specs from c:/tools/gnu/rsxntdj/lib/specs
gcc driver version 2.95.2 19991024 (release) executing gcc version 2.8.1

I know it can be done, since I adpated some C compression code and
actually made a vb-callable dll.  It can even handle call back
functions.

I want to create a simple dll for my own use, of common stuff that C can
do more efficiantly than VB, but I discovered something very peculiar.

I copied the working dll stuff to a new dir, renamed everything, etc,
etc, and compiled.  I got a huge list of errors, a sample being:

gccw32 -Wall -O3 -Zsys -I..\include -Zdll  -c deltalib.c
gccw32 -Wall -O3 -Zsys -Zdll -o deltalib.dll deltalib.o strcount.o -ldll
-lmain -Ttext=0x10001000
c:/.../libc.a(startup.o)(.text+0xc7):startup: undef ref `_nfiles'
c:/.../libc.a(startup.o)(.text+0xd2):startup: undef ref `_files'
c:/.../libc.a(startup.o)(.text+0xe0):startup: undef ref `_lookahead'
c:/.../libc.a(startup.o)(.text+0xea):startup: undef ref `_io_ninherit'
c:/.../libc.a(startup.o)(.text+0x149):startup: undef ref `_files'
c:/.../libc.a(startup.o)(.text+0x16c):startup: undef ref `_nfiles'
c:/.../libgcc.a(frame.o)(.text+0x1ff):frame: undef ref `malloc'
c:/.../libgcc.a(frame.o)(.text+0x6d3):frame: undef ref `malloc'
c:/.../libgcc.a(frame.o)(.text+0x704):frame: undef ref `free'
c:/.../libgcc.a(frame.o)(.text+0x755):frame: undef ref `abort'
c:/.../libgcc.a(frame.o)(.text+0x815):frame: undef ref `free'
c:/.../libgcc.a(frame.o)(.text+0x826):frame: undef ref `abort'

(I've abbreviated parts)

If I add a simple function to my dll startup module:

void Prepare( void )
{
  ( void )fopen( "", "" );
}

the dll is created with nary a warning nor error!

any thoughts as to what causes this behavious, and is there a more
elegant way to force fopen() to be linked in than a dummy function as
above?

April

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