linux-kernel - Re: [PATCH 3/4] kbuild: error out if $(KBUILD

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Message-ID: <CAK7LNASP+aXcVY9sm+yM0pYFBCqPxqA-n8TYEwDpqSCjRXx_zg@mail.gmail.com>
Date:   Sun, 17 Jul 2022 00:38:21 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] kbuild: error out if $(KBUILD_EXTMOD) contains % or :

On Thu, Jul 14, 2022 at 2:03 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> If the directory pass given to KBUILD_EXTMOD (or M=) contains % or :,

This is a typo.

directory pass -> directory path




> the module fails to build.
>
> % is used in pattern rules, and : as the separator of dependencies.
>
> Bail out with a clearer error message.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
>
>  Makefile | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/Makefile b/Makefile
> index faa4880f25f7..ecda62e27553 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -129,6 +129,9 @@ endif
>  $(if $(word 2, $(KBUILD_EXTMOD)), \
>         $(error building multiple external modules is not supported))
>
> +$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
> +       $(error module directory path cannot contain '$x')))
> +
>  # Remove trailing slashes
>  ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
>  KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
> --
> 2.34.1
>


-- 
Best Regards
Masahiro Yamada