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SubjectRe: powerpc-linux-objdump: Warning: Unrecognized form: 0x23
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@intel.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?
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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