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

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Date:   Mon, 20 Aug 2018 11:55:03 -0700
From:   Frank Rowand <frowand.list@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts/dtc: consolidate include path options in Makefile

On 07/03/18 18:59, Masahiro Yamada wrote:
> 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>
> ---
> 
>  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

Shouldn't that be += instead of :=?

-Frank

>  
> -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
>