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Date:      Wed, 01 Dec 1999 00:50:57 +0800
From:      Peter Wemm <peter@netplex.com.au>
To:        "Daniel C. Sobral" <dcs@newsguy.com>
Cc:        Marcel Moolenaar <marcel@scc.nl>, current@FreeBSD.ORG
Subject:   Re: kernel: -mpreferred-stack-boundary=2 ?? 
Message-ID:  <19991130165057.91EB91CA0@overcee.netplex.com.au>
In-Reply-To: Message from "Daniel C. Sobral" <dcs@newsguy.com>  of "Tue, 30 Nov 1999 22:59:59 %2B0900." <3843D85F.959CDB2E@newsguy.com> 

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"Daniel C. Sobral" wrote:
> Marcel Moolenaar wrote:
> > 
> > Julian Elischer wrote:
> > >
> > > When did this come in? (I have been seeing it for a while but..
> > > I thought this was to save space on the bootblocks, not the entire
> > > kernel?)
> > 
> > Shortly after setting it for the bootblock. It breaks backward
> > compatibility and bogusly applies to the tools (xxx_genassym) as well.
> > As you can tell, I'm not quite happy with it...
> 
> That's why we made world first and kernel later for so long, y'know.
> Changing userland "tools" to depend on new syscalls has always been
> a far more rare happening than changing kernel to depend on new
> userland tools.

-mpreferred-stack-boundary=2 is only picked up after a 'make world'.
There's nothing stopping you building a -current kernel on an older world
or older gcc. It's the world build that activates the option when bsd.kern.mk
is installed in /usr/share/mk.

Cheers,
-Peter




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