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

From: Florian Weimer
Subject: Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
Date: Fri, 29 Dec 2006 22:46:58 +0100

* Daniel Berlin:

> OTOH, people who rely on signed overflow being wraparound generally
> *know* they are relying on it.
> Given this seems to be some  small number of people and some small
> amount of code (since nobody has produced any examples showing this
> problem is rampant, in which case i'm happy to be proven wrong), why
> don't they just compile *their* code with -fwrapv?

A lot of security patches to address integer overflow issues use
post-overflow checks, unfortunately.  Even if GCC optimizes them away,
it's unlikely that it'll break applications in an obvious way.
(Security-related test cases are typically not publicly available.)

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