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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: Joe dot Buck at synopsys dot com
Cc: autoconf-patches at gnu dot org, bug-gnulib at gnu dot org, eggert at cs dot ucla dot edu, gcc at gcc dot gnu dot org
Date: Sat, 30 Dec 2006 20:57:12 EST
Subject: Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
References: <200612300047.kBU0lFwk014817@localhost.localdomain> <87bqlmkui3.fsf@penguin.cs.ucla.edu> <10612300508.AA08474@vlsi1.ultra.nyu.edu> <87psa1izpc.fsf@penguin.cs.ucla.edu> <45963E6D.5070203@t-online.de> <10612301301.AA14129@vlsi1.ultra.nyu.edu> <871wmht4ab.fsf@penguin.cs.ucla.edu> <10612302258.AA24598@vlsi1.ultra.nyu.edu> <87lkkosz1n.fsf@penguin.cs.ucla.edu> <20061231013401.GB30795@synopsys.com>

> I suppose there is
> 
>       *hv = (HOST_WIDE_INT) -(unsigned HOST_WIDE_INT) h1;
> 
> to make it safe.

Can't that conversion overflow?

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

References:
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Andrew Pinski
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Paul Eggert
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Richard Kenner
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Paul Eggert
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Bernd Schmidt
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Richard Kenner
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Paul Eggert
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Richard Kenner
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Paul Eggert
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Joe Buck

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