[patch] kbuild: correctly skip tilded backups in localversion files

[Oleg Verych <olecom@flower.upol.cz>]

kbuild: correctly skip tilded backups in localversion files

 Tildes as in path as in filenames are handled correctly now.

 Definition of `space' was removed, scripts/Kbuild.include has one.
 This definition was taken right from GNU make manual, while Kbuild's
 version is original.

Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Bastian Blank <bastian@waldi.eu.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Oleg Verych <olecom@flower.upol.cz>
---
Another try.

Original report and fix by Bastian Blank:

 The following patch fixes the problem that localversion files where
 ignored if the tree lives in a path which contains a ~. It changes the
 test to apply to the filename only.
 
 Debian allows versions which contains ~ in it. The upstream part of the
 version is in the directory name of the build tree and we got weird
 results because the localversion files was just got ignored in this
 case.

 Makefile |   15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

--- linux-2.6.20-rc6/Makefile~4tilde-backups~	2007-01-30 23:33:45.781462750 +0100
+++ linux-2.6.20-rc6/Makefile	2007-01-31 07:46:18.696404500 +0100
@@ -777,5 +777,5 @@ $(vmlinux-dirs): prepare scripts
 #	$(localver-full)
 #	  $(localver)
-#	    localversion*		(all localversion* files)
+#	    localversion*		(files, without backups containing '~')
 #	    $(CONFIG_LOCALVERSION)	(from kernel config setting)
 #	  $(localver-auto)		(only if CONFIG_LOCALVERSION_AUTO is set)
@@ -788,14 +788,9 @@ $(vmlinux-dirs): prepare scripts
 # scripts/setlocalversion and add the appropriate checks as needed.
 
-nullstring :=
-space      := $(nullstring) # end of line
-
-___localver = $(objtree)/localversion* $(srctree)/localversion*
-__localver  = $(sort $(wildcard $(___localver)))
-# skip backup files (containing '~')
-_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
-
+localversion = $(objtree)/localversion	    $(srctree)/localversion
+ext_versions = $(objtree)/localversion[^~]* $(srctree)/localversion[!~]*
+versions = $(localversion) $(ext_versions)
 localver = $(subst $(space),, \
-	   $(shell cat /dev/null $(_localver)) \
+	   $(shell cat /dev/null $(sort $(wildcard $(versions)))) \
 	   $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 
-
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