linux-kernel - Re: [RFC PATCH 05/33] Makefile support to build Xen subarch

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Date:	Tue, 18 Jul 2006 04:40:07 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	chrisw@...s-sol.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.osdl.org, xen-devel@...ts.xensource.com,
	jeremy@...p.org, ak@...e.de, rusty@...tcorp.com.au,
	zach@...are.com, ian.pratt@...source.com,
	Christian.Limpach@...cam.ac.uk
Subject: Re: [RFC PATCH 05/33] Makefile support to build Xen subarch

On Tue, 18 Jul 2006 12:00:13 +0200
Arjan van de Ven <arjan@...radead.org> wrote:

> On Tue, 2006-07-18 at 00:00 -0700, Chris Wright wrote:
> > plain text document attachment (i386-mach-xen)
> > Use arch/i386/mach-xen when building Xen subarch. The separate
> > subarchitecture allows us to hide details of interfacing with the
> > hypervisor from i386 common code.
> 
> 
> Hi,
> 
> please change the order of your patches next time, by sending the
> makefile and config options first you'll break git bisect...
> 

No, this patch is OK (in that respect).  As long as the git-bisect user
sets CONFIG_XEN=n (and surely he will), things will compile.

That being said,

+mflags-$(CONFIG_X86_XEN)	:= -Iinclude/asm-i386/mach-xen
+mcore-$(CONFIG_X86_XEN)		:= mach-xen
+
 # generic subarchitecture
 mflags-$(CONFIG_X86_GENERICARCH) := -Iinclude/asm-i386/mach-generic
 mcore-$(CONFIG_X86_GENERICARCH) := mach-default
@@ -99,6 +103,7 @@ drivers-$(CONFIG_PM)			+= arch/i386/powe

 CFLAGS += $(mflags-y)
 AFLAGS += $(mflags-y)
+CPPFLAGS += $(mflags-y)

This change affects _all_ subarchitectures (by potentially altering their
CPPFLAGS) and it's rather a mystery why one subarch needs the -Ifoo in its
CPPFLAGS whereas all the others do not.
-
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