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

From: Paul Eggert
Subject: Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
Date: Wed, 17 Jan 2007 00:24:52 -0800
User-agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux)

Thorsten Glaser <address@hidden> writes:

> Paul Eggert dixit:
>>  […] gcc -O2 makes no promises without
>>  -fwrapv.
> gcc -O1 -fwrapv even doesn't work correctly for gcc3,
> and gcc2 and gcc <3.3(?) don't even have -fwrapv:

The latter would not be a problem, since Autoconf would try -fwrapv on
a test module before using it to compile a real module.

Do you have a test case illustrating the gcc3 bug?  If so,
perhaps Autoconf could include that in its test of -fwrapv.

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