linux-kernel - Re: [PATCH] scripts/dtc: consolidate include path options in Makefile

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Date:   Mon, 20 Aug 2018 15:55:21 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     DTML <devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Frank Rowand <frowand.list@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scripts/dtc: consolidate include path options in Makefile

Hi Rob,


2018-07-04 10:59 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
> It is tedious to specify extra compiler options for every file.
> HOST_EXTRACFLAGS is useful to add options to all files in a
> directory.
>
> -I$(src)/libfdt is needed for all the files in this directory
> to include libfdt_env.h etc. from scripts/dtc/libfdt/.
>
> On the other hand, -I$(src) is used to include check-in headers
> from generated C files.  Thus, I added it only to dtc-lexer.lex.o
> and dtc-parser.tab.o .
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>


I hope this is a good clean-up.

May I apply this to my kbuild tree for v4.19 ?


> ---
>
>  scripts/dtc/Makefile | 18 ++++--------------
>  1 file changed, 4 insertions(+), 14 deletions(-)
>
> diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
> index 9cac65b..1c943e0 100644
> --- a/scripts/dtc/Makefile
> +++ b/scripts/dtc/Makefile
> @@ -9,21 +9,11 @@ dtc-objs      := dtc.o flattree.o fstree.o data.o livetree.o treesource.o \
>  dtc-objs       += dtc-lexer.lex.o dtc-parser.tab.o
>
>  # Source files need to get at the userspace version of libfdt_env.h to compile
> +HOST_EXTRACFLAGS := -I$(src)/libfdt
>
> -HOSTCFLAGS_DTC := -I$(src) -I$(src)/libfdt
> -
> -HOSTCFLAGS_checks.o := $(HOSTCFLAGS_DTC)
> -HOSTCFLAGS_data.o := $(HOSTCFLAGS_DTC)
> -HOSTCFLAGS_dtc.o := $(HOSTCFLAGS_DTC)
> -HOSTCFLAGS_flattree.o := $(HOSTCFLAGS_DTC)
> -HOSTCFLAGS_fstree.o := $(HOSTCFLAGS_DTC)
> -HOSTCFLAGS_livetree.o := $(HOSTCFLAGS_DTC)
> -HOSTCFLAGS_srcpos.o := $(HOSTCFLAGS_DTC)
> -HOSTCFLAGS_treesource.o := $(HOSTCFLAGS_DTC)
> -HOSTCFLAGS_util.o := $(HOSTCFLAGS_DTC)
> -
> -HOSTCFLAGS_dtc-lexer.lex.o := $(HOSTCFLAGS_DTC)
> -HOSTCFLAGS_dtc-parser.tab.o := $(HOSTCFLAGS_DTC)
> +# Generated files need one more search path to include headers in source tree
> +HOSTCFLAGS_dtc-lexer.lex.o := -I$(src)
> +HOSTCFLAGS_dtc-parser.tab.o := -I$(src)
>
>  # dependencies on generated files need to be listed explicitly
>  $(obj)/dtc-lexer.lex.o: $(obj)/dtc-parser.tab.h
> --
> 2.7.4
>
> --
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-- 
Best Regards
Masahiro Yamada