linux-kernel - Re: [kbuild-all] Re: powerpc-linux-objdump: Warning: Unrecognized form: 0x23

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Message-ID: <YxAS9NBjBI/vi0XK@dev-arch.thelio-3990X>
Date:   Wed, 31 Aug 2022 19:03:32 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     "Chen, Rong A" <rong.a.chen@...el.com>
Cc:     kernel test robot <lkp@...el.com>,
        Kees Cook <keescook@...omium.org>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [kbuild-all] Re: powerpc-linux-objdump: Warning: Unrecognized
 form: 0x23

Hi Rong,

On Thu, Sep 01, 2022 at 09:15:58AM +0800, Chen, Rong A wrote:
> 
> 
> On 8/31/2022 11:40 PM, Nathan Chancellor wrote:
> > On Wed, Aug 31, 2022 at 02:52:36PM +0800, kernel test robot wrote:
> > > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > > head:   dcf8e5633e2e69ad60b730ab5905608b756a032f
> > > commit: f9b3cd24578401e7a392974b3353277286e49cee Kconfig.debug: make DEBUG_INFO selectable from a choice
> > > date:   5 months ago
> > > config: powerpc-buildonly-randconfig-r003-20220830 (https://download.01.org/0day-ci/archive/20220831/202208311414.4OPuYS9K-lkp@intel.com/config)
> > > compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project c7df82e4693c19e3fd2e25c83eb04d9deb7b7b59)
> > > reproduce (this is a W=1 build):
> > >          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> > >          chmod +x ~/bin/make.cross
> > >          # install powerpc cross compiling tool for clang build
> > >          # apt-get install binutils-powerpc-linux-gnu
> > >          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9b3cd24578401e7a392974b3353277286e49cee
> > >          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > >          git fetch --no-tags linus master
> > >          git checkout f9b3cd24578401e7a392974b3353277286e49cee
> > >          # save the config file
> > >          mkdir build_dir && cp config build_dir/.config
> > >          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash
> > > 
> > > If you fix the issue, kindly add following tag where applicable
> > > Reported-by: kernel test robot <lkp@...el.com>
> > > 
> > > All warnings (new ones prefixed by >>):
> > > 
> > > > > powerpc-linux-objdump: Warning: Unrecognized form: 0x23
> > 
> > Given this is clang 16.0.0 with
> > CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y, which uses DWARF5 by
> > default instead of DWARF4, it looks like older binutils not
> > understanding DWARF5. What version of binutils is being used by the bot?
> 
> Hi Nathan,
> 
> We're using binutils v2.38.90.20220713-2
> 
> ||/ Name           Version            Architecture Description
> +++-==============-==================-============-==========================================
> ii  binutils       2.38.90.20220713-2 amd64        GNU assembler, linker and binary utilities

Thanks for chiming in! This looks like the output of 'dpkg -l', right? I
noticed on second glance that the tuple for the objdump warning above is
'powerpc-linux-', which leads me to believe that a kernel.org toolchain
(or a self compiled one) is being used. I would expect the tuple to be
'powerpc-linux-gnu-' if Debian's package was being used. Is that
possible?

Cheers,
Nathan