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

From: Richard Kenner
Subject: Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
Date: Sun, 31 Dec 2006 10:08:32 EST

> Well, that's not equivalent. For instance, MPFR has many conditions
> that evaluate to TRUE or FALSE on some/many implementations (mainly
> because the type sizes depend on the implementation), even without
> the assumption that an overflow cannot occur.

Can you give an example of such a condition and show how an optimization that
assumed overflows were undefined could break that code?

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