On Mon, Dec 28, 2020 at 4:15 PM Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote: > > On Sun, Dec 27, 2020 at 7:47 PM Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote: > > > > On Fri, Dec 4, 2020 at 2:13 AM 'Nick Desaulniers' via Clang Built > > Linux <clang-built-linux@xxxxxxxxxxxxxxxx> 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 <ndesaulniers@xxxxxxxxxx> 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. > > > > > > [ ... ] Some more numbers with Linux v5.10.4. GCC v10.2.1 GNU/ld BFDd v2.35.1 LLD v11.0.1-rc2 LLVM toolchain v11.0.1-rc2 So using GCC with LLD together with DWARF v5 reduces the binary sizes. Looks like Gmail makes the tabella look ugly... | gcc10-bfd | gcc10-lld | gcc10-llvm | clang-ias ---------------------------------------------------------- vmlinux.o | 580212 | 504508 | 504508 | 353864 ---------------------------------------------------------- vmlinux | 503172 | 509944 | 509944 | 358500 ---------------------------------------------------------- dbg deb | 701576 | 606348 | 607656 | 506816 ...so I add the lines below. 580212 5.10.4-1-amd64-gcc10-bfd/vmlinux.o 504508 5.10.4-2-amd64-gcc10-lld/vmlinux.o 504508 5.10.4-3-amd64-gcc10-llvm/vmlinux.o 353864 5.10.4-4-amd64-clang-ias/vmlinux.o 503172 5.10.4-1-amd64-gcc10-bfd/vmlinux 509944 5.10.4-2-amd64-gcc10-lld/vmlinux 509944 5.10.4-3-amd64-gcc10-llvm/vmlinux 358500 5.10.4-4-amd64-clang-ias/vmlinux 701576 5.10.4-1-amd64-gcc10-bfd/linux-image-5.10.4-1-amd64-gcc10-bfd-dbg_5.10.4-1~bullseye+dileks1_amd64.deb 606348 5.10.4-2-amd64-gcc10-lld/linux-image-5.10.4-2-amd64-gcc10-lld-dbg_5.10.4-2~bullseye+dileks1_amd64.deb 607656 5.10.4-3-amd64-gcc10-llvm/linux-image-5.10.4-3-amd64-gcc10-llvm-dbg_5.10.4-3~bullseye+dileks1_amd64.deb 506816 5.10.4-4-amd64-clang-ias/linux-image-5.10.4-4-amd64-clang-ias-dbg_5.10.4-4~bullseye+dileks1_amd64.deb - Sedat - > > > > > > 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@xxxxxxxxxxxxxxxx. > > > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/CAKwvOdkZEiHK01OD420USb0j%3DF0LcrnRbauv9Yw26tu-GRbYkg%40mail.gmail.com.
