kbuild: fix ia64 breakage after introducing make -rR

kbuild used $¤(*F to get filename of target without extension.
This was used in several places all over kbuild, but introducing
make -rR broke his for all cases where we specified full path to
target/prerequsite. It is assumed that make -rR disables old style
suffix-rules which is why is suddenly failed.

ia64 was impacted by this change because several div* routines in
arch/ia64/lib are build using explicit paths and then kbuild failed.

Thanks to David Mosberger-Tang <David.Mosberger@acm.org> for an explanation
what was the root-cause and for testing on ia64.

This patch also fixes two uses of $(*F) in arch/um

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index b0d067be7390..2180c88cfe89 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -13,6 +13,10 @@ space   := $(empty) $(empty)
 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
 
 ###
+# filename of target with directory and extension stripped
+basetarget = $(basename $(notdir $@))
+
+###
 # Escape single quote for use in echo statements
 escsq = $(subst $(squote),'\$(squote)',$1)