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

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Date:   Thu, 1 Sep 2022 09:15:58 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        kernel test robot <lkp@...el.com>
Cc:     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



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

Best Regards,
Rong Chen

> CONFIG_DEBUG_INFO_DWARF5 requires 2.35.2, it seems like it might be
> worth trying to extend those dependencies to
> CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT to avoid issues like this,
> especially in lieu of Nick's series here, which is already codifying the
> implicit default DWARF version of the compiler.
> 
> https://lore.kernel.org/20220826181035.859042-1-ndesaulniers@google.com/
> 
> Cheers,
> Nathan
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