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

From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
To: richard dot guenther at gmail dot com
Cc: autoconf-patches at gnu dot org, bug-gnulib at gnu dot org, dberlin at dberlin dot org, eggert at cs dot ucla dot edu, gcc at gcc dot gnu dot org, iant at google dot com, mark at codesourcery dot com
Date: Tue, 02 Jan 2007 08:31:31 EST
Subject: Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
References: <87fybbyq27.fsf@penguin.cs.ucla.edu> <20061220123349.GE7947@iam.uni-bonn.de> <emc3jc$eap$1@sea.gmane.org> <87mz57xjlf.fsf@penguin.cs.ucla.edu> <m3odpmsnlc.fsf@localhost.localdomain> <45996521.3090405@codesourcery.com> <87tzza49iz.fsf@penguin.cs.ucla.edu> <4aca3dc20701011700k62de98b2udff5890dad4f0c79@mail.gmail.com> <4599B6E8.4020403@codesourcery.com> <84fc9c000701020222x528695b5pb6a86356e10ff6bb@mail.gmail.com>

> I can do this.  What I also will do is improve VRP to still fold comparisons
> of the for a - 10 > 20 when it knows there is no overflow due to available
> range information for a (it doesn't do that right now).

I thought fold-const.c optimizes that right now and has been for a long time?
If that's the case, I don't see why we should change it: we have absolutely
no evidence of legacy code that would be affected and it's quite common due
to macro substitution.

References:
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Paul Eggert
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Daniel Berlin
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Mark Mitchell
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Richard Guenther

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