linux-kernel - Re: [PATCH] kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD

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Message-ID: <CAK7LNAStyrVnrc4GQ7MNQizBpKbRk-1WmNQEw5mzAp2+LYUiyA@mail.gmail.com>
Date:   Wed, 18 Aug 2021 13:28:45 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Fāng-ruì Sòng <maskray@...gle.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Pitre <nico@...xnic.net>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y

On Sun, Aug 15, 2021 at 12:18 PM Fāng-ruì Sòng <maskray@...gle.com> wrote:
>
> On Sat, Aug 14, 2021 at 6:15 PM Nathan Chancellor <nathan@...nel.org> wrote:
> >
> > On 8/14/2021 4:41 PM, Masahiro Yamada wrote:
> > > When CONFIG_TRIM_UNUSED_KSYMS is enabled, I see some warnings like this:
> > >
> > >    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 CONFIG_TRIM_UNUSED_KSYMS")
> > > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
>
> LGTM.
>
> FWIW binutils>=2.37 `nm -q` can be used to suppress "no symbols"
> https://sourceware.org/bugzilla/show_bug.cgi?id=27408
>
> llvm-nm>=13.0.0 supports -q as well.


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






-- 
Best Regards
Masahiro Yamada