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[Xen-devel] 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@xxxxxxxxxxxxx> 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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