[kbuild 3/5] Add cloneconfig target

[Andreas Gruenbacher]

Cloneconfig takes the first configuration it finds which appears to
belong to the running kernel, and configures the kernel sources to match
this configuration as closely as possible.

Signed-off-by: Andreas Gruenbacher <agruen@xxxxxxx>

Index: linux-2.6.11-rc1-bk6/scripts/kconfig/Makefile
===================================================================
--- linux-2.6.11-rc1-bk6.orig/scripts/kconfig/Makefile
+++ linux-2.6.11-rc1-bk6/scripts/kconfig/Makefile
@@ -37,6 +37,22 @@ allnoconfig: $(obj)/conf
 allmodconfig: $(obj)/conf
 	$< -m arch/$(ARCH)/Kconfig
 
+UNAME_RELEASE := $(shell uname -r)
+CLONECONFIG := $(firstword $(wildcard /proc/config.gz \
+				      /lib/modules/$(UNAME_RELEASE)/.config \
+				      /etc/kernel-config \
+				      /boot/config-$(UNAME_RELEASE)))
+cloneconfig: $(obj)/conf
+	$(Q)case "$(CLONECONFIG)" in				\
+	'')	echo -e "The configuration of the running"	\
+			"kernel could not be determined\n";	\
+		false ;;					\
+	*.gz)	gzip -cd $(CLONECONFIG) > .config.running ;;	\
+	*)	cat $(CLONECONFIG) > .config.running ;;		\
+	esac &&							\
+	echo -e "Cloning configuration file $(CLONECONFIG)\n"
+	$(Q)$< -D .config.running arch/$(ARCH)/Kconfig
+
 defconfig: $(obj)/conf
 ifeq ($(KBUILD_DEFCONFIG),)
 	$< -d arch/$(ARCH)/Kconfig

--
Andreas Gruenbacher <agruen@xxxxxxx>
SUSE Labs, SUSE LINUX PRODUCTS GMBH

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