From: Randy Dunlap <randy.dunlap@oracle.com>
To: lkml <linux-kernel@vger.kernel.org>
Cc: olecom@flower.upol.cz, sam@ravnborg.org, zippel@linux-m68k.org
Subject: kbuild feature/question: default ARCH
Date: Tue, 13 Feb 2007 22:06:19 -0800 [thread overview]
Message-ID: <20070213220619.ce964f58.randy.dunlap@oracle.com> (raw)
Hi,
I'd like for kbuild to default ARCH to the already-symlinked
arch in include/asm-$(ARCH) if ARCH is not specified on the
command line or in the environment. I have a non-working patch,
complete with a circular dependency which is dropped:
make: Circular ' <- ' dependency dropped.
Any suggestions for how to complete this?
Thanks.
---
From: Randy Dunlap <randy.dunlap@oracle.com>
If ARCH is unspecified (command line or environment) and if
include/asm is already a symlink to include/asm-$ARCH,
use that ARCH as the default instead of the host ARCH.
Undo the effect of this by using 'make mrproper' or just 'rm include/asm'.
This allows us to drop 'ARCH=fobr' for subsequent builds of the same
ARCH, after using it in a build one time (not counting make *config).
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
---
Makefile | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
--- linux-2.6.20-git9.orig/Makefile
+++ linux-2.6.20-git9/Makefile
@@ -172,6 +172,10 @@ SUBARCH := $(shell uname -m | sed -e s/i
# make ARCH=ia64
# Another way is to have ARCH set in the environment.
# The default ARCH is the host where make is executed.
+#
+# However, if include/asm is already a symlink to include/asm-$ARCH,
+# use that ARCH as the default instead of the host ARCH.
+# Undo the effect of this by using 'make mrproper' or just 'rm include/asm'.
# CROSS_COMPILE specify the prefix used for all executables used
# during compilation. Only gcc and related bin-utils executables
@@ -182,6 +186,20 @@ SUBARCH := $(shell uname -m | sed -e s/i
# Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
+# if ARCH is unspecified & symlink include/asm exists, set ARCH to
+# its symlink arch
+@echo ' CHK DEF ARCH -> include/asm:'
+$(Q)if [ "$(ARCH)" == "" -a -h $(srctree)/include/asm ]; then \
+ symlink=`readlink include/asm` \
+ len=`expr length $symlink` \
+ if [ len -le 4 ]; then \
+ @echo ' no symlink for include/asm' \
+ else \
+ ARCH=${symlink:4} \
+ @echo ' ARCH symlink to ${ARCH}' \
+ fi \
+fi
+
ARCH ?= $(SUBARCH)
CROSS_COMPILE ?=
next reply other threads:[~2007-02-14 6:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-14 6:06 Randy Dunlap [this message]
2007-02-14 6:23 ` kbuild feature/question: default ARCH Randy Dunlap
2007-02-14 9:11 ` Sam Ravnborg
2007-02-14 11:27 ` [pp] kbuild: ARCH-setup (Re: kbuild feature/question: default ARCH) Oleg Verych
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