Date: Wed, 25 Aug 1999 14:30:41 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: Anne Hawson <anne DOT hawson AT virgin DOT net>
cc: djgpp AT delorie DOT com
Subject: Re: I can't compile with the -O2 switch.
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On Tue, 24 Aug 1999, Anne Hawson wrote:

> I wanted to compile C++ code into an executable with optimisations.
> In this case, it is a tiny program called "keypress.cpp"
> (pasted at the end of this message).
> It compiles fine with -
> 
> >  gxx -o keypress.exe keypress.cpp
> but complains with -
> 
> >  gxx -O2 keypress.exe keypress.cpp

You need to keep the -o as well, like this:

	gxx -O2 -o keypress.exe keypress.cpp

I believe the file README.1ST which comes with DJGPP explains how to 
invoke the compiler correctly.