only update version header as needed
authorMike Frysinger <vapier@gentoo.org>
Mon, 4 Feb 2008 22:44:23 +0000 (17:44 -0500)
committerWolfgang Denk <wd@denx.de>
Thu, 14 Feb 2008 22:43:24 +0000 (23:43 +0100)
Constantly rebuilding the version header will force useless relinking, so we
simply need to compare the new header with the existing one before updating
it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Makefile

index 9225a2d..969ce42 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -343,7 +343,8 @@ $(VERSION_FILE):
                echo -n "$(U_BOOT_VERSION)" ; \
                echo -n $(shell $(CONFIG_SHELL) $(TOPDIR)/tools/setlocalversion \
                         $(TOPDIR)) ; \
-               echo "\"" ) > $(VERSION_FILE)
+               echo "\"" ) > $@.tmp
+               @cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@
 
 gdbtools:
                $(MAKE) -C tools/gdb all || exit 1