Re: [HOWTO] set extra_cflags to indicate compilation against -mm kernels

From: Sam Ravnborg (sam_at_ravnborg.org)
Date: 07/31/05

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    Date:	Sun, 31 Jul 2005 10:44:06 +0200
To: Michael Krufky <mkrufky@m1k.net>

    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
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