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

From: Ian Lance Taylor
Subject: Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
Date: 01 Jan 2007 16:40:00 -0800
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.4

Bruce Korb <address@hidden> writes:

> > 2) Add an option like -fstrict-signed-overflow which controls those
> >    cases which appear to be risky.  Turn on that option at -O2.
> Not a good plan.  -O2 should be constrained to disrupting very few
> applications.  (e.g. loop unrolling seems unlikely to cause problems)
> Defer the "appear to be risky" stuff to several years after the warning
> is out.  Please.

Why should we handle signed overflow any differently from strict
aliasing?  We currently enable strict aliasing at -O2.


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