From: David Laight <David.Laight@ACULAB.COM>
To: 'Masahiro Yamada' <masahiroy@kernel.org>,
"linux-kbuild@vger.kernel.org" <linux-kbuild@vger.kernel.org>
Cc: Dominique Martinet <asmadeus@codewreck.org>,
Michal Marek <michal.lkml@markovi.net>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH 3/3] kbuild: rewrite ld-version.sh in shell script
Date: Sat, 12 Dec 2020 21:47:40 +0000 [thread overview]
Message-ID: <ff1adc79f7884ba1a1dcbdd806e81d7b@AcuMS.aculab.com> (raw)
In-Reply-To: <20201212165431.150750-3-masahiroy@kernel.org>
From: Masahiro Yamada
> Sent: 12 December 2020 16:55
>
> This script was written in awk in spite of the file extension '.sh'.
> Rewrite it as a shell script.
...
> +#
> +# Usage: $ ./scripts/ld-version.sh ld
> +#
> +# Print the linker version of `ld' in a 5 or 6-digit form
> +# such as `23501' for GNU ld 2.35.1 etc.
> +
> +first_line="$($* --version | head -n 1)"
> +
> +if ! ( echo $first_line | grep -q "GNU ld"); then
> + echo 0
> + exit 1
> +fi
> +
> +# Distributions may append an extra string like 2.35-15.fc33
> +# Take the part that consists of numbers and dots.
> +VERSION=$(echo $first_line | sed 's/.* \([^ ]*\)$/\1/' | sed 's/^\(^[0-9.]*\).*/\1/')
> +MAJOR=$(echo $VERSION | cut -d . -f 1)
> +MINOR=$(echo $VERSION | cut -d . -f 2)
> +PATCHLEVEL=$(echo $VERSION | cut -d . -f 3)
> +printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
Hmmmm.....
You've managed to convert an awk script into something that requires
sh, head, grep, sed (twice), and cut (thrice).
Plus (probably) a few sub-shells.
It is quite ease to do it all in all in the shell.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2020-12-12 21:49 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-12 16:54 [PATCH 1/3] kbuild: do not use scripts/ld-version.sh for checking spatch version Masahiro Yamada
2020-12-12 16:54 ` [PATCH 2/3] kbuild: LD_VERSION redenomination Masahiro Yamada
2020-12-14 23:05 ` Will Deacon
2020-12-15 13:48 ` Thomas Bogendoerfer
2021-01-28 6:38 ` Masahiro Yamada
2020-12-12 16:54 ` [PATCH 3/3] kbuild: rewrite ld-version.sh in shell script Masahiro Yamada
2020-12-12 17:48 ` Dominique Martinet
2020-12-21 14:23 ` Masahiro Yamada
2020-12-12 20:21 ` kernel test robot
2020-12-12 20:53 ` kernel test robot
2020-12-12 21:42 ` kernel test robot
2020-12-12 21:47 ` David Laight [this message]
2020-12-21 14:29 ` Masahiro Yamada
2020-12-21 14:51 ` David Laight
2020-12-12 17:30 ` [Cocci] [PATCH 1/3] kbuild: do not use scripts/ld-version.sh for checking spatch version Julia Lawall
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