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Date:   Thu, 18 Aug 2022 15:14:00 -0300
From:   Arnaldo Carvalho de Melo <acme@kernel.org>
To:     Quentin Monnet <quentin@isovalent.com>
Cc:     Roberto Sassu <roberto.sassu@huaweicloud.com>,
        peterz@infradead.org, mingo@redhat.com, mark.rutland@arm.com,
        alexander.shishkin@linux.intel.com, jolsa@kernel.org,
        namhyung@kernel.org, linux-perf-users@vger.kernel.org,
        bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
        Roberto Sassu <roberto.sassu@huawei.com>
Subject: Re: [PATCH 3/3] tools/build: Display logical OR of a feature flavors
Message-ID: <Yv6BaHgC4E4J0TTT@kernel.org>
References: <20220818120957.319995-1-roberto.sassu@huaweicloud.com>
 <20220818120957.319995-3-roberto.sassu@huaweicloud.com>
 <Yv46EW6KbUe9zjur@kernel.org>
 <71544d2970e246e1f0d5f5ec065ea2437df58cd9.camel@huaweicloud.com>
 <23da162e-1018-9bfa-bc5c-ec09eba9428b@isovalent.com>
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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@huaweicloud.com escreveu:
> >>> From: Roberto Sassu <roberto.sassu@huawei.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@redhat.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?

- Arnaldo