DWARF v5 is the latest standard of the DWARF debug info format. DWARF5 wins significantly in terms of size when mixed with compression (CONFIG_DEBUG_INFO_COMPRESSED). Link: http://www.dwarfstd.org/doc/DWARF5.pdf Patch 1 is a cleanup from Masahiro and isn't DWARF v5 specific. Patch 2 is a cleanup that lays the ground work and isn't DWARF v5 specific. Patch 3 implements Kconfig and Kbuild support for DWARFv5. Changes from v3: Changes as per Arvind: * only add -Wa,-gdwarf-5 for (LLVM=1|CC=clang)+LLVM_IAS=0 builds. * add -gdwarf-5 to Kconfig shell script. * only run Kconfig shell script for Clang. Apologies to Sedat and Nathan; I appreciate previous testing/review, but I did no carry forward your Tested-by and Reviewed-by tags, as the patches have changed too much IMO. Changes from v2: * Drop two of the earlier patches that have been accepted already. * Add measurements with GCC 10.2 to commit message. * Update help text as per Arvind with help from Caroline. * Improve case/wording between DWARF Versions as per Masahiro. Changes from the RFC: * split patch in 3 patch series, include Fangrui's patch, too. * prefer `DWARF vX` format, as per Fangrui. * use spaces between assignment in Makefile as per Masahiro. * simplify setting dwarf-version-y as per Masahiro. * indent `prompt` in Kconfig change as per Masahiro. * remove explicit default in Kconfig as per Masahiro. * add comments to test_dwarf5_support.sh. * change echo in test_dwarf5_support.sh as per Masahiro. * remove -u from test_dwarf5_support.sh as per Masahiro. * add a -gdwarf-5 cc-option check to Kconfig as per Jakub. Masahiro Yamada (1): Remove $(cc-option,-gdwarf-4) dependency from CONFIG_DEBUG_INFO_DWARF4 Nick Desaulniers (2): Kbuild: make DWARF version a choice Kbuild: implement support for DWARF v5 Makefile | 15 +++++++---- include/asm-generic/vmlinux.lds.h | 6 ++++- lib/Kconfig.debug | 41 +++++++++++++++++++++++++------ scripts/test_dwarf5_support.sh | 9 +++++++ 4 files changed, 58 insertions(+), 13 deletions(-) create mode 100755 scripts/test_dwarf5_support.sh -- 2.30.0.284.gd98b1dd5eaa7-goog
