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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, bosch at adacore dot com, bug-gnulib at gnu dot org, dberlin at dberlin dot org, dewar at adacore dot com, eggert at cs dot ucla dot edu, gcc at gcc dot gnu dot org
Date: Tue, 02 Jan 2007 10:31:12 EST
Subject: Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
References: <200612300047.kBU0lFwk014817@localhost.localdomain> <8764bssikm.fsf@penguin.cs.ucla.edu> <571f6b510612310047r3b7ef9acl4a0ab082e88e17a3@mail.gmail.com> <87bqlkmm3r.fsf@penguin.cs.ucla.edu> <4aca3dc20612310641n78e8898euf1c003444e2303eb@mail.gmail.com> <84fc9c000612310645h67066c70vf9eb11af74b639a7@mail.gmail.com> <4aca3dc20612311613r2992db50o851c7d73603b42ef@mail.gmail.com> <22C62FE7-259E-43F7-9DB5-5F3A9CF574E2@adacore.com> <84fc9c000701020204v5e5ad239uec526652ff18eedc@mail.gmail.com> <459A64EF.1090801@adacore.com> <84fc9c000701020701i76cee5c2s6ad8f3868b2b20b3@mail.gmail.com>

> We do that with -fstrict-aliasing, which also changes language semantics.

Well, yes, but not quite in the same way.  Indeed it's rather hard to
describe in what way it changes the language semantics but easier to
describe the effect it has on optimization.  I think -fwrapv is the other
way around.

Follow-Ups:
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Richard Guenther

References:
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Daniel Berlin
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Geert Bosch
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Richard Guenther
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Robert Dewar
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Richard Guenther

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