From: Michael Krufky <mkrufky@m1k.net>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Andrew Morton <akpm@osdl.org>
Subject: [HOWTO] set extra_cflags to indicate compilation against -mm kernels
Date: Sat, 30 Jul 2005 17:29:21 -0400 [thread overview]
Message-ID: <42EBF131.60507@m1k.net> (raw)
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
inside C files:
#ifdef MM_KERNEL
/* code needed by -mm kernel only */
#else
/* original code for compilation against -linus */
#endif
This should probably be documented somewhere, but I don't know where it
goes.......
--
Michael Krufky
next reply other threads:[~2005-07-30 21:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-30 21:29 Michael Krufky [this message]
2005-07-31 8:44 ` [HOWTO] set extra_cflags to indicate compilation against -mm kernels Sam Ravnborg
2005-07-31 14:05 ` Michael Krufky
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