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

From: Robert Dewar
Subject: Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
Date: Sat, 24 Mar 2007 20:30:26 -0400
User-agent: Thunderbird (Windows/20070221)

Ian Lance Taylor wrote:

I believe there is a comprehensible distinction between "compiler will
not assume that signed overflow is undefined behaviour" and "compiler
will cause all arithmetic to wrap around."

In any case, I have no plans to continue working on this.  I described
my work in considerable detail as I did it and the patches have gone
through multiple rounds of review.  I would be happy to see your
concrete proposal.

First, I would get some real figures on performance comparing


It is really hard to estimate the value of the second dubious
(dubious because ill-defined, it seems to try to create a state
of undefined definedness) switch compared to the other two


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