Date: Mon, 24 May 1999 12:23:48 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Vladimir Mosgalin <mosgalin AT school DOT ioffe DOT rssi DOT ru>
cc: djgpp AT delorie DOT com
Subject: Re: GCC optimization
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On Mon, 24 May 1999, Vladimir Mosgalin wrote:

> What means optimization flags higher then -O3.
> There is no documentation...

There's no information in your message, either ;-)

Seriously, the optimizations beyond -O3 are compiler-version dependent.  
For example, in GCC 2.7.x all levels higher than 3 are like -O3.

But you didn't tell which compiler version you are using...