kbuild: reuse this-makefile to define abs_srctree
Move this-makefile up, and reuse it to define abs_srctree.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff --git a/Makefile b/Makefile
index 4dafeae..667602a 100644
--- a/Makefile
+++ b/Makefile
@@ -145,7 +145,8 @@
need-sub-make := 1
endif
-abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
+this-makefile := $(lastword $(MAKEFILE_LIST))
+abs_srctree := $(realpath $(dir $(this-makefile)))
ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
$(error source directory cannot contain spaces or colons)
@@ -160,8 +161,6 @@
need-sub-make := 1
endif
-this-makefile := $(lastword $(MAKEFILE_LIST))
-
ifneq ($(filter 3.%,$(MAKE_VERSION)),)
# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
# We need to invoke sub-make to avoid implicit rules in the top Makefile.