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Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."

From: Mark Mitchell
Subject: Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
Date: Mon, 01 Jan 2007 17:51:46 -0800
User-agent: Thunderbird (Windows/20061207)

Richard Kenner wrote:

>> Where there are reasonable positions on both sides, nobody ever
>> accurately predicts what the majority of a hugely diverse population
>> of language users is going to want, and almost everyone believes
>> they are in that majority.
> I agree.  That's why I support a middle-of-the-road position where we make
> very few "guarantees", but do the best we can anyway to avoid gratuitously
> (meaning without being sure we're gaining a lot of optimization) breaking
> legacy code.

Yes, I think that you, Danny, Ian, and I are all agreed on that point,
and, I think, that disabling the assumption about signed overflow not
occurring during VRP (perhaps leaving that available under control of a
command-line option, for those users who think it will help their code),
 is the right thing to try.

Mark Mitchell
(650) 331-3385 x713

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