Re: egcs -O6 fails to compile make 3.75 on i686-pc-linux-gnulibc1

[mrs at wrs dot com (Mike Stump)]

> Date: Thu, 18 Sep 1997 17:05:08 +0200 (MET DST)
> From: Kamil Iskra <kamil@dwd.interkom.pl>
> To: Daniel.Veillard@imag.fr
> cc: egcs@cygnus.com

> I noticed that some people use EGCS with optimisation level higher
> than 3. Does this make any sense?

Yes.

> According to the manual, using levels >=4 is equivalent to level 3.

The manual will be wrong.  We know this.  :-) This is why we use -O9,
memorize it, train our fingers to type it...  While it may seem
pointless today, in the future, -O9 may run some really hairy
optimizations, and we want to use them...  It we were trained to use
-O3, the day would come when -O4 did a little something more.  Then
-O5.

Also, it is a sub-conscience wish on our part...  We want the
generated code to be better than it is.  :-) Kinda like praying before
you compile and test.  While praying may in fact help, better to
engineer in the quality and robustness.

> I've heard that pgcc supports higher optimisation levels than 3, but
> is this also true for EGCS?

In time...