linux-kernel - Re: [PATCH] kbuild: compile-test global headers to ensure they are self-contained

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Date:   Tue, 25 Jun 2019 08:11:20 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] kbuild: compile-test global headers to ensure they are
 self-contained

> 
> When all header files below include/drm are self-contained it will be a
> single line:
> 
>     header-test-y += $(all_headers_with_subdir)
In reality it will likely be the above, and then a list of 

header-test-n += foo.h

For the header files that we for one or the other reason do not want to
make self-contained.
It would be nice to have the list of ignored files close to their home
and not a full list in one Makefile in include/

> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 3e630fcaffd1..e2f765e9d1e1 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -67,6 +67,7 @@ extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
>  endif
>  
>  # Test self-contained headers
> +header-test-y := $(filter-out $(header-test-n), $(header-test-y))
This part should include the logic to filter out duplicates too.
I think we may do something wrong if the same header is listed twice.

We could also extend this with a check that all files in header-test-n
exits.

	Sam