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Date:	Wed, 28 Apr 2004 13:03:24 -0500
From:	Brian Ford <ford AT vss DOT fsi DOT com>
Reply-To:	cygwin AT cygwin DOT com
To:	Tim Prince <tprince AT computer DOT org>
cc:	Dave Korn <dk AT artimi DOT com>, cygwin AT cygwin DOT com, gcc AT gcc DOT gnu DOT org
Subject:	RE: g++ 3.4.0 cygwin, codegen SSE & alignement issues
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On Wed, 28 Apr 2004, Tim Prince wrote:

> At 08:51 AM 4/28/2004, Dave Korn wrote:
>
> > > From: cygwin-owner On Behalf Of tbp
> > > Sent: 28 April 2004 16:16
> >
> >[  Now x-posted to gcc list, since it's seemingly a gcc issue rather than a
> >cygwin environment issue.

It's an interoperability issue.

> >   I'd recommend doing that in the startup code in gcc's crt0.s myself.

That won't help for threads.  See:

http://www.cygwin.com/ml/cygwin/2004-04/msg01134.html

> > The real question is, is the compiler generating code that guarantees
> > the stack stays aligned, so you can do that just once at startup?  It
> > certainly ought to.

It is supposed to, given the call back and new thread caveats.

> As Dave said, this is more of a gcc than a cygwin issue,

For threads, it happens to be easiest to fix this in Cygwin.

> gcc made a decision, which is different from commercial compilers,

and the ABI.

-- 
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained pilot...

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