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kbuild: add --include-dir flag only for out-of-tree build

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The --include-dir flag is used to include check-in Makefiles from
$(objtree) without $(srctree)/ prefix.  Obviously, this is unneeded
for in-tree build.  Add the flag just before changing the working
directory.

This becomes effective after invoking sub-make.  Add a little bit
comments about it.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2018-09-14 15:33:23 +09:00
parent 00d78ab2ba
commit 80463f1b7b
1 changed files with 10 additions and 4 deletions
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14
Makefile
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@ -15,10 +15,9 @@ NAME = Merciless Moray
PHONY := _all
_all:
# o Do not use make's built-in rules and variables
# (this increases performance and avoids hard-to-debug behaviour);
# o Look for make include files relative to root of kernel src
MAKEFLAGS += -rR --include-dir=$(CURDIR)
# Do not use make's built-in rules and variables
# (this increases performance and avoids hard-to-debug behaviour)
MAKEFLAGS += -rR
# Avoid funny character set dependencies
unexport LC_ALL
@ -136,6 +135,13 @@ KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
$(if $(KBUILD_OUTPUT),, \
$(error failed to create output directory "$(saved-output)"))
# Look for make include files relative to root of kernel src
#
# This does not become effective immediately because MAKEFLAGS is re-parsed
# once after the Makefile is read. It is OK since we are going to invoke
# 'sub-make' below.
MAKEFLAGS += --include-dir=$(CURDIR)
PHONY += $(MAKECMDGOALS) sub-make
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make