linux-kernel - Re: [PATCH] kbuild: use POSIX-compatible grep option

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Date:   Tue, 18 Oct 2022 06:31:42 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Stefan Hansson <newbie13xd@...il.com>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: use POSIX-compatible grep option

On Tue, Oct 18, 2022 at 12:02 AM Stefan Hansson <newbie13xd@...il.com> wrote:
>
> --file is a GNU extension to grep which is not available in all
> implementations (such as BusyBox). Use the -f option instead which is
> eqvuialent according to the GNU grep manpage[1] and is present in
> POSIX[2].
>
>  [1] https://www.gnu.org/software/grep/manual/grep.html
>  [2] https://pubs.opengroup.org/onlinepubs/9699919799/


This link does not show the spec of grep.


Did you mean this?

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html




Thanks.





>
> Signed-off-by: Stefan Hansson <newbie13xd@...il.com>
> ---
>  Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index c690361b393f..3513a6db66a2 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1218,7 +1218,7 @@ quiet_cmd_ar_vmlinux.a = AR      $@
>        cmd_ar_vmlinux.a = \
>         rm -f $@; \
>         $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
> -       $(AR) mPiT $$($(AR) t $@ | head -n1) $@ $$($(AR) t $@ | grep -F --file=$(srctree)/scripts/head-object-list.txt)
> +       $(AR) mPiT $$($(AR) t $@ | head -n1) $@ $$($(AR) t $@ | grep -Ff $(srctree)/scripts/head-object-list.txt)
>
>  targets += vmlinux.a
>  vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE
> --
> 2.37.3
>


-- 
Best Regards
Masahiro Yamada