linux-kernel - Re: [PATCH] Documentation: kbuild: Add note about using (subst m,y)

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Date:   Wed, 1 Mar 2023 01:25:53 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Alexander Lobakin <aleksander.lobakin@...el.com>
Cc:     David Gow <davidgow@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Jonathan Corbet <corbet@....net>,
        Sadiya Kazi <sadiyakazi@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        linux-kbuild@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation: kbuild: Add note about using (subst m,y)

On Wed, Mar 1, 2023 at 12:16 AM Alexander Lobakin
<aleksander.lobakin@...el.com> wrote:
>
> From: Masahiro Yamada <masahiroy@...nel.org>
> Date: Tue, 28 Feb 2023 17:30:09 +0900
>
> > On Tue, Feb 28, 2023 at 12:13 PM David Gow <davidgow@...gle.com> wrote:
>
> [...]
>
> >> +Example::
> >> +
> >> +  #drivers/Makefile
> >> +  obj-$(subst m,y,$(CONFIG_HYPERV)) += hv/
> >> +
> >
> >
> > I think many subsystems simply do
> >
> > obj-y  += hv/
>
> This creates a ton of empty built-in.a, each of them is listed in the
> Kbuild output. Someone may think that if a directory contains
> built-in.a, then something was built there. Sure it's their problems,
> but I'd prefer to not pollute the log and built-in.a contents when
> possible (empty files are still listed there IIRC).


You can choose whichever you like.
Up to each subsystem maintainer.






-- 
Best Regards
Masahiro Yamada