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Subject: Re: More on XEmacs-20.0-b90 on Linux 2.0.27
References: <199701120419.XAA11153@the-great-machine.mit.edu> <rvenfr5xja.fsf@sdnp5.ucsd.edu>
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From: Steven L Baur <steve@miranova.com>
In-Reply-To: David Moore's message of 11 Jan 1997 20:26:33 -0800
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Date: 11 Jan 1997 21:08:06 -0800
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David Moore writes:

> Jered J Floyd <jered@mit.edu> writes:
>> Configured for `i586-unknown-linux2.0.27'.

>> What compiler should XEmacs be built with?              gcc -O6

> 	Is gcc -O6 safe under linux?

Not necessarily.  The Pentium gcc has documented problems at -O6.  The
only major package I've tried at -O6 (with gcc-2.7.2) is zsh, and it
came out so much larger than at lower levels of optimization for no
noticeable speed increase, I haven't used it since.  I've been using
-O4 consistently since the release of 19.14 and haven't had problems.
I did some XEmacs benchmarking between -O4 and -O2 earlier, and didn't
get a measurable speed difference.

Definitely knock it down to -O2 first, it's the kernel default and
probably the best tested.
-- 
steve@miranova.com baur
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