Messages in this thread | | | Date | Sun, 31 Jul 2005 10:05:53 -0400 | From | Michael Krufky <> | Subject | Re: [HOWTO] set extra_cflags to indicate compilation against -mm kernels |
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Sam Ravnborg wrote:
>On Sat, Jul 30, 2005 at 05:29:21PM -0400, Michael Krufky wrote: > > >>With the addition of topdir-mm.patch into the -mm tree (since >>2.6.13-rc3-mm2), it is now possible for Makefile to detect whether a cvs >>subtree is being built against -mm or not... -mm kernels now have a .mm >>file in the top level directory. >> >>inside Makefile: >> >>mm-kernel := $(TOPDIR)/.mm >>ifneq ($(mm-kernel),) >>MM_KERNEL_CFLAGS := -DMM_KERNEL=$(shell cat $(mm-kernel) 2> /dev/null) >>ifneq ($(MM_KERNEL_CFLAGS),-DMM_KERNEL=) >>EXTRA_CFLAGS += $(MM_KERNEL_CFLAGS) >>endif >>endif >> >> > >Hi Michael. >The content of the .mm file seems to be insignificant - '1'. The important >issue is that the file is present. >Also please do not use $(TOPDIR) - it is deprecated. > >The following is enough: >EXTRA_CFLAGS += $(if $(wildcard $(srctree)/.mm), -DMM_KERNEL) > >If the file exist in the root of the kernel src tree MM_KERNEL will be >added to EXTRA_CFLAGS. > Sam-
Thank you! I knew there might be a more efficient way to do that, so I'm glad I sent that to LKML for you to see ;-)
Still, I think it should be added into the documentation somewhere... I'd be happy to submit a patch, I just don't know where it should go. Obviously, this is specific to -mm kernels only. Do you know?
-- Michael Krufky
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