Date: Thu, 23 Aug 2001 12:05:54 +0300
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender: halo1 AT zahav DOT net DOT il
To: kvogt AT UVic DOT CA
Message-Id: <8011-Thu23Aug2001120553+0300-eliz@is.elta.co.il>
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CC: djgpp AT delorie DOT com
In-reply-to: <Pine.A41.4.32.0108222322260.84838-100000@unix5.uvic.ca>
	(kvogt AT UVic DOT CA)
Subject: Re: gcc 'undefined reference' error
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> From: <kvogt AT UVic DOT CA>
> Newsgroups: comp.os.msdos.djgpp
> Date: Thu, 23 Aug 2001 00:17:21 -0700
> 
> I am trying to use
> a program called PCTimer, which uses the following functions that my
> linker has trouble with. Some of these are declared in pc.h; I should have
> used one of them, rather than ScreenMode(), in my example.
> 
> __dpmi_simulate_real_mode_interrupt
> __dpmi_simulate_real_mode_procedure_iret
> _go32_dpmi_allocate_real_mode_callback_iret
> 
> [more functions omitted]

This is a sign of an installation problem, since all these functions
are in DJGPP's libc.a.

> I also posted my verbose gcc output at the same location. I named it
> 'gcc.txt'.

And this was the key to unlock the problem: you have RSXNTDJ
installed, and thus the compiler was using RSXNT libraries, not DJGPP
libraries.  I'm guessing that you have C_INCLUDE_PATH and LIBRARY_PATH
variables set in the environment which point to the RSXNTDJ
directories.  These variables force the compiler and linker to use
RSXNT headers and libraries, and that's why you have unresolved
references.

Here's the relevant line from the output produced by "gcc -v":

> c:/djgpp/bin/ld.exe -o test.exe c:/djgpp/lib/crt0w32.o -Lc:/djgpp/lib/st -Lc:/djgpp/lib -Lc:/djgpp/lib/gcc-lib/djgpp/2.953 -Lc:/djgpp/bin -Lc:/djgpp/lib/st -Lc:/djgpp/lib c:/djgpp/tmp\ccezkpvS.o c:/djgpp/tmp\ccYLEN9l.o -lpc -lalias -lgcc -lc -lmain -lc_app -lc -lgcc -lemx -lkrn32 -lusr32 -lgdi32 -lemx2 -Trsxnt.djl

Note the telltale "-Trsxnt.djl" at the end of this line, as well as
libraries such as -lgdi32 and -lkrn32 -- these are Windows libraries.

Solution: remove the above-mentioned environment variables, and DJGPP
should start working again.

> I just installed DJGPP today, using the following zip files:
> alleg312.zip
> bnu2112b.zip
> djdev203.zip
> em2005b.zip
> em2005li.zip
> faq230b.zip
> fil40s.zip
> gcc2953b.zip
> gpp2953b.zip
> grx243s.zip
> mak3791b.zip
> rh1478b.zip
> rsxdj151.zip
> txi40b.zip

These are all okay.  The Allegro library is a bit old, though; you
might wish to look for a newer version if you intend to work seriously
with Allegro.  But Allegro has nothing to do with your current
inability to link programs such as PCTimer.