From: "John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Help me understand memory limits!!
Date: Fri, 03 Apr 1998 18:02:53 -0500
Organization: Two pounds of chaos and a pinch of salt.
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Message-ID: <35256A9D.BFC@cs.com>
References: <199804020200 DOT SAA18608 AT adit DOT ap DOT net> <3524B83E DOT 9D754CC9 AT johnbryce DOT co DOT il>
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Noam Rotem wrote:
> 
> Nate Eldredge wrote:
> 
> >  *When* the program crashes (by
> > doing something illegal), a register dump and stack traceback is printed to
> > help you debug it. The `symify' program can help make those numbers more
> > meaningful.
> 
> Where can I find this 'symify'? Should I add something to the linking process in
> order to preserve the symbolic tables?

Symify comes with DJGPP (specifically, in djdev201.zip); it should be in
your 'bin' directory.  To use it properly, you should add the '-g' flag
to the compiler command line; this adds full debugging symbol
information.  Note that this must be done at compilation; the linker is
not capable of generating symbol tables.  By default it leaves debugging
information in the final executable; with the '-s' option it will remove
such information.

When a program crashes, you must run "symify program.exe" while the
traceback remains on the screen.  If you saved the traceback to disk
(perhaps by redirecting stderr), use "symify -i traceback-file
program.exe".  This is useful for debugging graphics programs that crash
while not in text mode.  To have symify save the "symified" traceback to
a file, use "symify -o output-file program.exe".  This file could then
be posted here if you can't figure out your problem from its contents.

My standard compilation options for C and C++ programs are '-Wall',
'-O', and '-g'.  Together, this produces maximum warnings and optimized
code with full debugging information.

-- 
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|      John M. Aldrich       | "A committee is a life form with six |
|       aka Fighteer I       | or more legs and no brain."          |
|   mailto:fighteer AT cs DOT com   |                                      |
| http://www.cs.com/fighteer |                 - Lazarus Long       |
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