Alexey reported that the fraction of unknown filename instances in
kallsyms grew from ~0.3% to ~10% recently; Bill and Greg tracked it down
to assembler defined symbols, which regressed as a result of:
commit b8a9092330da ("Kbuild: do not emit debug info for assembly with LLVM_IAS=1")
In that commit, I allude to restoring debug info for assembler defined
symbols in a follow up patch, but it seems I forgot to do so in
commit a66049e2cf0e ("Kbuild: make DWARF version a choice")
Do so requires a fixup for as-option, which seems to be failing when
used in scripts/Makefile.debug.
Also includes a fix for DEBUG_INFO_SPLIT while I'm here. Dmitrii
reports that this has been broken since gcc-11+ & clang-12+. I'm
guessing no one uses this .config option...since no one else has
reported it being broken yet...
Changes from v2 -> v3:
* Pick up Nathan's Reviewed-by and Tested-by tags.
* Reword commit message 1/5 and 2/5 as per Nathan.
* Add Masahiro's Suggested-by tag where relevant.
* Use -x assembler-with-cpp -Werror in as-option and as-instr as per Masahiro.
* Fix AMDGPU compiler version check as per Nathan.
* Drop cc-min-version, as per Masahiro.
* Replace patch 4 with a variant of Masahiro's suggestion.
* Reword commit message 4/5.
Changes from v1 -> v2:
* 5 patches now, rather than 3.
* Split change to arch/x86/boot/compressed/Makefile off of first patch,
as per Masahiro.
* Introduce compiler specific macros, as per Bill, and eradicate
cc-ifversion while I'm at it.
* Update commit message of final patch to refer to 866ced950bcd.
v2: https://lore.kernel.org/llvm/20220831184408.2778264-1-ndesaulniers@xxxxxxxxxx/
v1: https://lore.kernel.org/llvm/20220826181035.859042-1-ndesaulniers@xxxxxxxxxx/
*** BLURB HERE ***
Nick Desaulniers (5):
x86/boot/compressed: prefer cc-option for CFLAGS additions
Makefile.compiler: Use KBUILD_AFLAGS for as-option
Makefile.compiler: replace cc-ifversion with compiler-specific macros
Makefile.debug: re-enable debug info for .S files
Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO_SPLIT
Documentation/kbuild/makefiles.rst | 29 ++++++++++++---------
Makefile | 6 ++---
arch/x86/boot/compressed/Makefile | 2 +-
drivers/gpu/drm/amd/display/dc/dml/Makefile | 2 +-
lib/Kconfig.debug | 4 ++-
scripts/Makefile.compiler | 18 ++++++++-----
scripts/Makefile.debug | 25 ++++++++----------
7 files changed, 46 insertions(+), 40 deletions(-)
--
2.37.2.789.g6183377224-goog
