On Fri, Dec 4, 2020 at 2:13 AM 'Nick Desaulniers' via Clang Built Linux wrote: > > sigh...I ran a broken script to send the series which doesn't cc folks properly. > + lkml, linux-kbuild > (Might just resend, properly) > > On Thu, Dec 3, 2020 at 5:11 PM Nick Desaulniers wrote: > > > > 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 that lays the ground work and isn't DWARF > > v5 specific. > > Patch 2 implements Kconfig and Kbuild support for DWARFv5. > > > > 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. > > I have tested v3 on top of Linux v5.10.3 on Debian/testing AMD64. Numbers talk - bullshit walks. [ Linus Torvalds ] [ 5.10.3-1-amd64-gcc10-bfd ] GNU-toolchain: GCC v10.2.1 and GNU/ld BFD v2.35.1 503096 vmlinux 6864 vmlinux.compressed 580104 vmlinux.o 701856 linux-image-5.10.3-1-amd64-gcc10-bfd-dbg_5.10.3-1~bullseye+dileks1_amd64.deb [ 5.10.3-1-amd64-clang-ias ] LLVM-toolchain: Clang and LLD v11.0.1-rc2 358424 vmlinux 7032 vmlinux.compressed 353788 vmlinux.o 508336 linux-image-5.10.3-1-amd64-clang-ias-dbg_5.10.3-1~bullseye+dileks1_amd64.deb [ 5.10.3-1-amd64-gcc10-bfd ] $ llvm-dwarfdump-11 vmlinux.o | head -15 error: vmlinux.o: file format elf64-x86-64 .debug_info contents: decoding address ranges: invalid range list offset 0x265 0x00000000: Compile Unit: length = 0x0000001f, format = DWARF32, version = 0x0005, unit_type = DW_UT_compile, abbr_offset = 0x0000, addr_size = 0x08 (next unit at 0x00 000023) 0x0000000c: DW_TAG_compile_unit DW_AT_stmt_list (0x00000000) DW_AT_ranges (0x0000000c [0x0000000000000000, 0x000000000000021c) [0x0000000000000000, 0x000000000000019e) [0x0000000000000000, 0x0000000000002000)) DW_AT_name ("head_64.S") DW_AT_comp_dir ("/home/dileks/src/linux-kernel/git") DW_AT_producer ("GNU AS 2.35.1") DW_AT_language (DW_LANG_Mips_Assembler) [ 5.10.3-1-amd64-clang-ias ] $ llvm-dwarfdump-11 vmlinux.o | head -15 vmlinux.o: file format elf64-x86-64 .debug_info contents: 0x00000000: Compile Unit: length = 0x00000377, format = DWARF32, version = 0x0005, unit_type = DW_UT_compile, abbr_offset = 0x0000, addr_size = 0x08 (next unit at 0x00 00037b) 0x0000000c: DW_TAG_compile_unit DW_AT_stmt_list (0x00000000) DW_AT_ranges (0x0000000c [0x0000000000000000, 0x0000000000002000) [0x0000000000000000, 0x000000000000021c) [0x0000000000000000, 0x000000000000019e)) DW_AT_name ("arch/x86/kernel/head_64.S") DW_AT_comp_dir ("/home/dileks/src/linux-kernel/git") DW_AT_producer ("Debian clang version 11.0.1-+rc2-1") DW_AT_language (DW_LANG_Mips_Assembler) Attached are my kernel config files. Feel free to add my: Tested-by: Sedat Dilek - sed@ - > > 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 | 35 ++++++++++++++++++++++++++----- > > scripts/test_dwarf5_support.sh | 9 ++++++++ > > 4 files changed, 53 insertions(+), 12 deletions(-) > > create mode 100755 scripts/test_dwarf5_support.sh > > > > -- > > 2.29.2.576.ga3fc446d84-goog > > > > > -- > Thanks, > ~Nick Desaulniers > > -- > You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. > To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/CAKwvOdkZEiHK01OD420USb0j%3DF0LcrnRbauv9Yw26tu-GRbYkg%40mail.gmail.com.