Adding LOCALVERSION to build

[Ian Wienand]

Hi,

If you are wanting to build multiple versions of the same kernel to
test things out, it would be really handy to have a LOCALVERSION
variable that could be easily overridden.  I used to just play with
EXTRAVERSION, but that has become increasingly inappropriate and it
really would be nicer to just be able to do make O=outputdir
LOCALVERSION=aversion and have it appended so uname reports something
useful.

I just tried the attached, which works but having a dummy dependency
to make the version.h check run all the time is a bit ugly.  I can't
think of another way to indicate to make to update version.h if I
compile once with LOCALVERSION variable set from the command line, and
once without.

Anyway, is the general idea workable?

-i
ianw@xxxxxxxxxxxxxxxxxx
http://www.gelato.unsw.edu.au
===== Makefile 1.513 vs edited =====
--- 1.513/Makefile	2004-08-14 20:54:03 +10:00
+++ edited/Makefile	2004-08-23 11:40:57 +10:00
@@ -141,7 +141,12 @@
 
 export srctree objtree VPATH TOPDIR
 
-KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
+# Take config variable for localversion unless overridden on the command line
+ifneq ($(CONFIG_LOCALVERSION),"")
+	LOCALVERSION=$(subst ",,$(CONFIG_LOCALVERSION))
+endif
+
+KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)
 
 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 # first, and if a usermode build is happening, the "ARCH=um" on the command
@@ -722,7 +727,10 @@
 	)
 endef
 
-include/linux/version.h: Makefile
+.localversion.tmp: 
+#dummy, only need to update if localversion has changed
+
+include/linux/version.h: Makefile .localversion.tmp
 	$(call filechk,version.h)
 
 # ---------------------------------------------------------------------------
===== init/Kconfig 1.45 vs edited =====
--- 1.45/init/Kconfig	2004-07-28 07:43:46 +10:00
+++ edited/init/Kconfig	2004-08-23 11:24:52 +10:00
@@ -285,6 +285,11 @@
 
 	  If unsure, say N.
 
+config LOCALVERSION
+	string "Local Version"
+	help
+	  Add a special extra string to identify this kernel locally.
+
 endmenu		# General setup

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