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From: Eric Botcazou <ebotcazou@libertysurf.fr>
To: Matt Austern <austern@apple.com>
Subject: Re: generalized lvalues -- patch outline
Date: Tue, 23 Nov 2004 09:43:00 -0000
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Cc: gcc@gcc.gnu.org,
 Mark Mitchell <mark@codesourcery.com>,
 Steve Naroff <snaroff@apple.com>,
 Michael Matz <matz@suse.de>,
 Ziemowit Laski <zlaski@apple.com>,
 Joe Buck <Joe.Buck@synopsys.com>,
 Andrew Pinski <pinskia@physics.uc.edu>,
 Mike Stump <mrs@apple.com>
References: <4D2CF60C-3919-11D9-8BD2-000A95BCF344@apple.com> <41A27FA4.2000107@codesourcery.com> <DCE78ED4-3CEC-11D9-9441-000393B2ABA2@apple.com>
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> Partly depends on what the value of "..." actually is.  I'd be
> interested in seeing whether other compilers (EDG? IBM? Sun? HP?)
> support this extension.

poog% cat ext.c
void foo(char *p)
{
  *((long *) p)++ = 1;
}

poog% cc -S ext.c
"ext.c", line 3: warning: a cast does not yield an lvalue

poog% cc -V
cc: Sun C 5.5 Patch 112760-14 2004/09/28

The assembly code looks correct (full word stored, p is incremented by 4).

-- 
Eric Botcazou