linux-kernel - Re: [PATCH 3/3] tools/build: Display logical OR of a feature flavors

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Date:   Thu, 18 Aug 2022 23:15:39 +0100
From:   Quentin Monnet <quentin@...valent.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Roberto Sassu <roberto.sassu@...weicloud.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        "linux-perf-use." <linux-perf-users@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH 3/3] tools/build: Display logical OR of a feature flavors

On Thu, 18 Aug 2022 at 19:14, Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> Em Thu, Aug 18, 2022 at 05:40:04PM +0100, Quentin Monnet escreveu:
> > On 18/08/2022 14:25, Roberto Sassu wrote:
> > > On Thu, 2022-08-18 at 10:09 -0300, Arnaldo Carvalho de Melo wrote:
> > >> Em Thu, Aug 18, 2022 at 02:09:57PM +0200,
> > >> roberto.sassu@...weicloud.com escreveu:
> > >>> From: Roberto Sassu <roberto.sassu@...wei.com>
> > >>>
> > >>> Sometimes, features are simply different flavors of another
> > >>> feature, to
> > >>> properly detect the exact dependencies needed by different Linux
> > >>> distributions.
> > >>>
> > >>> For example, libbfd has three flavors: libbfd if the distro does
> > >>> not
> > >>> require any additional dependency; libbfd-liberty if it requires
> > >>> libiberty;
> > >>> libbfd-liberty-z if it requires libiberty and libz.
> > >>>
> > >>> It might not be clear to the user whether a feature has been
> > >>> successfully
> > >>> detected or not, given that some of its flavors will be set to OFF,
> > >>> others
> > >>> to ON.
> > >>>
> > >>> Instead, display only the feature main flavor if not in verbose
> > >>> mode
> > >>> (VF != 1), and set it to ON if at least one of its flavors has been
> > >>> successfully detected (logical OR), OFF otherwise. Omit the other
> > >>> flavors.
> > >>>
> > >>> Accomplish that by declaring a FEATURE_GROUP_MEMBERS-<feature main
> > >>> flavor>
> > >>> variable, with the list of the other flavors as variable value. For
> > >>> now, do
> > >>> it just for libbfd.
> > >>>
> > >>> In verbose mode, of if no group is defined for a feature, show the
> > >>> feature
> > >>> detection result as before.
> > >>
> > >> Looks cool, tested and added this to the commit log message here in
> > >> my
> > >> local branch, that will go public after further tests for the other
> > >> csets in it:
> > >>
> > >> Committer testing:
> > >>
> > >> Collecting the output from:
> > >>
> > >>   $ make -C tools/bpf/bpftool/ clean
> > >>   $ make -C tools/bpf/bpftool/ |& grep "Auto-detecting system
> > >> features" -A10
> > >>
> > >>   $ diff -u before after
> > >>   --- before    2022-08-18 10:06:40.422086966 -0300
> > >>   +++ after     2022-08-18 10:07:59.202138282 -0300
> > >>   @@ -1,6 +1,4 @@
> > >>    Auto-detecting system features:
> > >>    ...                                  libbfd: [ on  ]
> > >>   -...                          libbfd-liberty: [ on  ]
> > >>   -...                        libbfd-liberty-z: [ on  ]
> > >>    ...                                  libcap: [ on  ]
> > >>    ...                         clang-bpf-co-re: [ on  ]
> > >>   $
> > >>
> > >> Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> > >>
> > >> Thanks for working on this!
> > >
> > > Thanks for testing and for adapting/pushing the other patches!
> > >
> > > Roberto
> > >
> >
> > Tested locally for bpftool and I also observe "libbfd: [ on  ]" only.
> > This looks much better, thank you Roberto for following up on this!
>
> So I'll add your Tested-by: to this one as well, maybe to all the
> patches in this series?

Sorry, I haven't tested the first two patches other than by applying
them, so just for the third one preferably. Thanks!