commit 66cb86e48962ed96184ef3d1957a8a18c668e47a
author Denis Vlasenko <vda.linux@googlemail.com> Fri Apr 17 21:56:02 2009 +0000
committer Denis Vlasenko <vda.linux@googlemail.com> Fri Apr 17 21:56:02 2009 +0000
tree 21904a35565abf084bf1590375a4132e7e298548
parent 270b1c3f68d48797ccc2475c03024ccd91f8e07c

build system: remove some unnecessary rebuilds

applets/Kbuild

diff --git a/applets/Kbuild b/applets/Kbuild
index 2969e79..8aafe78 100644
--- a/applets/Kbuild
+++ b/applets/Kbuild
@@ -13,18 +13,21 @@
 always:= $(hostprogs-y)
 
 # Generated files need additional love
+# NB: __srctree is either empty or "srctree/"
+# using it instead of srctree decreases amount of rebuilds
+# if tree is merely renamed/copied
 
-HOSTCFLAGS_usage.o = -I$(srctree)/include
+HOSTCFLAGS_usage.o = -I$(__srctree)include
 
 applets/applets.o: include/usage_compressed.h include/applet_tables.h
 
-applets/usage:         .config $(srctree)/applets/usage_compressed
+applets/usage:         .config $(__srctree)applets/usage_compressed
 applets/applet_tables: .config
 
 quiet_cmd_gen_usage_compressed = GEN     include/usage_compressed.h
-      cmd_gen_usage_compressed = $(srctree)/applets/usage_compressed include/usage_compressed.h applets
+      cmd_gen_usage_compressed = $(__srctree)applets/usage_compressed include/usage_compressed.h applets
 
-include/usage_compressed.h: applets/usage $(srctree)/applets/usage_compressed
+include/usage_compressed.h: applets/usage $(__srctree)applets/usage_compressed
 	$(call cmd,gen_usage_compressed)
 
 quiet_cmd_gen_applet_tables = GEN     include/applet_tables.h