linux-kernel - Re: [PATCH v2] kbuild: add --include-dir flag only for out-of-tree build

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Date:   Sun, 30 Sep 2018 22:46:17 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] kbuild: add --include-dir flag only for out-of-tree build

2018年9月14日(金) 15:33 Masahiro Yamada <yamada.masahiro@...ionext.com>:
>
> 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@...ionext.com>
> ---


Applied to linux-kbuild.



> Changes in v2:
>   - Add some more comments
>
>  Makefile | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index f8c8e12..233b57d 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -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
> --
> 2.7.4
>


-- 
Best Regards
Masahiro Yamada