linux-kernel - Re: [PATCHv2] kconfig: add some Kconfig env variables to make help

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Date: Wed, 28 Feb 2024 13:56:52 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCHv2] kconfig: add some Kconfig env variables to make help

On (24/02/22 14:16), Sergey Senozhatsky wrote:
> On (24/02/22 13:57), Masahiro Yamada wrote:
> > On Thu, Feb 22, 2024 at 12:26 PM Sergey Senozhatsky
> > <senozhatsky@...omium.org> wrote:
> > >
> > > Add a new section "Configuration environment variables" to
> > > `make help` output in order to make it easier for people to
> > > discover KCONFIG_WERROR, etc.
> > >
> > > Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
> > > ---
> > >  scripts/kconfig/Makefile | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > >
> > > diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> > > index ea1bf3b3dbde..0044d49e149c 100644
> > > --- a/scripts/kconfig/Makefile
> > > +++ b/scripts/kconfig/Makefile
> > > @@ -158,6 +158,10 @@ help:
> > >                 if help=$$(grep -m1 '^# Help: ' $(f)); then \
> > >                         printf '  %-25s - %s\n' '$(notdir $(f))' "$${help#*: }"; \
> > >                 fi;)
> > > +       @echo  ''
> > > +       @echo  'Configuration environment variables:'
> > > +       @echo  '  KCONFIG_WERROR                 - Turn some Kconfig warnings into error conditions'
> > > +       @echo  '  KCONFIG_WARN_UNKNOWN_SYMBOLS   - Make Kconfig warn about all unrecognized config symbols'
> > >
> > >  # ===========================================================================
> > >  # object files used by all kconfig flavours
> > > --
> > > 2.44.0.rc0.258.g7320e95886-goog
> > >
> > >
> >
> > Why only two, while Kconfig supports more env variables?
> 
> Right.  I wanted to add only those that we use (and familiar with) for
> starters.  I'm not familiar with things like KCONFIG_PROBABILITY, for
> instance, and not sure how to document it (its Documentation/kbuild/kconfig.rst
> description is pretty lengthy).

Masahiro, any opinion?