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From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Wed, 18 Aug 2021 13:28:45 +0900
Message-ID: <CAK7LNAStyrVnrc4GQ7MNQizBpKbRk-1WmNQEw5mzAp2+LYUiyA@mail.gmail.com>
Subject: Re: [PATCH] kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y
To:     =?UTF-8?B?RsSBbmctcnXDrCBTw7JuZw==?= <maskray@google.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Nicolas Pitre <nico@fluxnic.net>,
        clang-built-linux <clang-built-linux@googlegroups.com>
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On Sun, Aug 15, 2021 at 12:18 PM F=C4=81ng-ru=C3=AC S=C3=B2ng <maskray@goog=
le.com> wrote:
>
> On Sat, Aug 14, 2021 at 6:15 PM Nathan Chancellor <nathan@kernel.org> wro=
te:
> >
> > On 8/14/2021 4:41 PM, Masahiro Yamada wrote:
> > > When CONFIG_TRIM_UNUSED_KSYMS is enabled, I see some warnings like th=
is:
> > >
> > >    nm: arch/x86/entry/vdso/vdso32/note.o: no symbols
> > >
> > > $NM (both GNU nm and llvm-nm) warns when no symbol is found in the
> > > object. Suppress the stderr.
> > >
> > > Fixes: bbda5ec671d3 ("kbuild: simplify dependency generation for CONF=
IG_TRIM_UNUSED_KSYMS")
> > > Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
>
> LGTM.
>
> FWIW binutils>=3D2.37 `nm -q` can be used to suppress "no symbols"
> https://sourceware.org/bugzilla/show_bug.cgi?id=3D27408
>
> llvm-nm>=3D13.0.0 supports -q as well.


Thanks for the info.
Perhaps, I can note the future migration to -q
in a comment.


--=20
Best Regards
Masahiro Yamada