linux-kernel - Re: [PATCH] tools: perf: Use "grep -E" instead of "egrep"

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Message-ID: <Y5n5esPQ0QkBpgda@kernel.org>
Date:   Wed, 14 Dec 2022 13:27:38 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] tools: perf: Use "grep -E" instead of "egrep"

Em Mon, Nov 21, 2022 at 08:52:47AM -0800, Ian Rogers escreveu:
> On Sun, Nov 20, 2022 at 6:59 PM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
> >
> >
> >
> > On 11/20/2022 02:17 AM, Ian Rogers wrote:
> > > On Fri, Nov 18, 2022 at 1:17 AM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
> > >>
> > >> The latest version of grep claims the egrep is now obsolete so the build
> > >> now contains warnings that look like:
> > >>         egrep: warning: egrep is obsolescent; using grep -E
> > >> fix this up by moving the related file to use "grep -E" instead.
> > >>
> > >>   sed -i "s/egrep/grep -E/g" `grep egrep -rwl tools/perf`
> > >>
> > >> Here are the steps to install the latest grep:
> > >>
> > >>   wget http://ftp.gnu.org/gnu/grep/grep-3.8.tar.gz
> > >>   tar xf grep-3.8.tar.gz
> > >>   cd grep-3.8 && ./configure && make
> > >>   sudo make install
> > >>   export PATH=/usr/local/bin:$PATH
> > >>
> > >> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> > >
> > > Hi Tiezhu,
> > >
> > > installing a newer grep tool in order to build/test perf is somewhat
> > > burdensome, as such I don't think we should merge this change. Looking
> > > at my Debian derived distro. I have grep 3.7, so I'd need to do this.
> > > I imagine the majority of people are using a grep earlier than 3.8. I
> > > agree there is a problem perhaps we can:
> > >  - rewrite to just need grep and not egrep;
> > >  - rewrite in a stable language with regex support, perhaps python;
> > >  - have a grep/egrep wrapper that selects based on version number.
> > >
> >
> > Hi Ian,
> >
> > I found this issue on Linux From Scratch system which uses grep 3.8 [0],
> > we can see the following NEWS in grep-3.8 release announcement [1]:
> >
> > "The egrep and fgrep commands, which have been deprecated since
> >   release 2.5.3 (2007), now warn that they are obsolescent and should
> >   be replaced by grep -E and grep -F."
> >
> > Additionally, the next grep rpm/deb version is 3.8 on Fedora [2]
> > and Debian [3], so use "grep -E" instead of "egrep" so we won't see
> > the warning for various versions of grep.
> >
> > [0] https://linuxfromscratch.org/~thomas/multilib/chapter06/grep.html
> > [1] https://savannah.gnu.org/forum/forum.php?forum_id=10227
> > [2] https://packages.fedoraproject.org/pkgs/grep/grep/fedora-rawhide.html
> > [3] https://packages.debian.org/sid/grep
> >
> > Thanks,
> > Tiezhu
> 
> Thanks Tiezhu,
> 
> My grep is 3.7 and has -E support. In the changelog I see:
> 
> ```
> 2021-08-14  Jim Meyering  <meyering@...com>
> 
>        version 3.7
>        * NEWS: Record release date.
> ```
> 
> So I'm guessing 3.8 is newer than is necessary for this change, but
> demonstrates the warning issue your change addresses. Arnaldo's build
> compatibility scripts should be able to spot further issues.
> 
> Acked-by: Ian Rogers <irogers@...gle.com>

Thanks, applied.

- Arnaldo