Date: Mon, 24 Apr 1995 10:43:54 +1100
From: Bill Currie <BILLC AT teleng1 DOT tait DOT co DOT nz>
Subject: Re: More optimization woes...
To: Bill Davidson <bdavidson AT ra DOT isisnet DOT com>
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu
Organization: Tait Electronics Ltd.

> Hi all:
> This may not be a djgpp problem (if not, tell me so and where to gripe) 
> but here it is:
> I have a program that uses inline (eg _farptr) functions, so I want to 
> compile with optimization (-O or -O2).  However, I am getting some weird 
> code generation, viz:
> 
> int ListProc (WINDOW wnd, MESSAGE msg, PARAM p1, PARAM p2) {
> [snip]
>     switch (msg) {
>         case CREATE_WINDOW:
>             wnd->ct = DFmalloc(sizeof(CTLWINDOW));
>             wnd->ct->setting = OFF;	// line 53
> [snip]
> 
> Under edebug32, it seems that line 53 is the first line that is executed; 
> the DFmalloc() line is not executed, and so wnd->ct is NULL and so 
> dereferencing it produces an exception.
I don't know wether your using C or C++ (or the version) but the 
2.5.7 version of gnu c++ seems to trash the line number debuggin 
information.