linux-kernel - Re: [patch 5/5] Add the -fstack-protector option to the CFLAGS

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Date:	Fri, 28 Jul 2006 23:58:52 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org,
	akpm@...l.org
Subject: Re: [patch 5/5] Add the -fstack-protector option to the CFLAGS

On Fri, Jul 28, 2006 at 11:40:45PM +0200, Arjan van de Ven wrote:
> On Fri, 2006-07-28 at 23:26 +0200, Sam Ravnborg wrote:
> > On Fri, Jul 28, 2006 at 09:00:01PM +0200, Andi Kleen wrote:
> > > On Friday 28 July 2006 20:48, Arjan van de Ven wrote:
> > > > On Fri, 2006-07-28 at 20:45 +0200, Andi Kleen wrote:
> > > > > > +ifdef CONFIG_CC_STACKPROTECTOR
> > > > > > +CFLAGS += $(call cc-ifversion, -lt, 0402, -fno-stack-protector)
> > > > > > +CFLAGS += $(call cc-ifversion, -ge, 0402, -fstack-protector)
> > > > >
> > > > > Why can't you just use the normal call cc-option for this?
> > > >
> > > > this requires gcc 4.2; cc-option is not useful for that.
> > > 
> > > The CC option thing is also very ugly.
> > The check is executed once pr. kernel compile - or at least once pr.
> > line. The reson to use cc-ifversion is that we need to check for a
> > specific gcc version and not just support for a specific argument type.
> > 
> > That said - checking for a version is not as reliable as checking if a
> > certain feature is really supported but Arjan suggested testing for
> > version >= 4.2 should do it.
> 
> 
> it's not hard to run a shell script that returns supported or not. I can
> do the shell script no problem... but I would prefer that you then do
> the Makefile foo for it :)
> Would that work?
Yep - no problem. If you give me a day or two to do it.

	Sam
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