linux-kernel - Re: [PATCH v5] kbuild: add variables for compression tools

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Date:   Sat, 6 Jun 2020 23:43:10 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Denis Efremov <efremov@...ux.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] kbuild: add variables for compression tools

On Fri, Jun 5, 2020 at 4:40 PM Denis Efremov <efremov@...ux.com> wrote:
>
> Allow user to use alternative implementations of compression tools,
> such as pigz, pbzip2, pxz. For example, multi-threaded tools to
> speed up the build:
> $ make GZIP=pigz BZIP2=pbzip2
>
> Variables _GZIP, _BZIP2, _LZOP are used internally because original env
> vars are reserved by the tools. The use of GZIP in gzip tool is obsolete
> since 2015. However, alternative implementations (e.g., pigz) still rely
> on it. BZIP2, BZIP, LZOP vars are not obsolescent.
>
> The credit goes to @grsecurity.
>
> As a sidenote, for multi-threaded lzma, xz compression one can use:
> $ export XZ_OPT="--threads=0"
>
> Signed-off-by: Denis Efremov <efremov@...ux.com>
> ---
> Changes in v2:
>   - _GZIP used instead of GZIP
>   - tar commands altered to use tools from the vars
> Changes in v3:
>   - _BZIP2 used instead of BZIP2
>   - _LZOP used instead of LZOP
> Changes in v4:
>   - Unexports removed from Kbuild.include
>   - MAKEOVERRIDES used in top Makefile
>   - All variables checks removed from scripts
> Changes in v5:
>   - Conflict with removed LASAT resolved


Replaced. Thanks.



-- 
Best Regards
Masahiro Yamada