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kbuild: add this-makefile as a shorthand for $(lastword $(MAKEFILE_LIST))

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Make it clearer, and self-documenting.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2020-05-11 12:50:12 +09:00
parent 827365ffda
commit 93fdddfefc
1 changed files with 4 additions and 2 deletions
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6
Makefile
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@ -157,12 +157,14 @@ MAKEFLAGS += --include-dir=$(abs_srctree)
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.
need-sub-make := 1
# Cancel implicit rules for this Makefile.
$(lastword $(MAKEFILE_LIST)): ;
$(this-makefile): ;
endif
export abs_srctree abs_objtree
@ -172,7 +174,7 @@ ifeq ($(need-sub-make),1)
PHONY += $(MAKECMDGOALS) sub-make
$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
$(filter-out _all sub-make $(this-makefile), $(MAKECMDGOALS)) _all: sub-make
@:
# Invoke a second make in the output directory, passing relevant variables