Commit 32ef9e50 authored by Nick Desaulniers's avatar Nick Desaulniers Committed by Masahiro Yamada

Makefile.debug: re-enable debug info for .S files

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 b8a90923 ("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 a66049e2 ("Kbuild: make DWARF version a choice")

Link: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=31bf18645d98b4d3d7357353be840e320649a67d
Fixes: b8a90923 ("Kbuild: do not emit debug info for assembly with LLVM_IAS=1")
Reported-by: default avatarAlexey Alexandrov <aalexand@google.com>
Reported-by: default avatarBill Wendling <morbo@google.com>
Reported-by: default avatarGreg Thelen <gthelen@google.com>
Reviewed-by: default avatarNathan Chancellor <nathan@kernel.org>
Suggested-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
Signed-off-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
parent 61f2b7c7
......@@ -264,8 +264,10 @@ config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
config DEBUG_INFO_DWARF4
bool "Generate DWARF Version 4 debuginfo"
select DEBUG_INFO
depends on !CC_IS_CLANG || (CC_IS_CLANG && (AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)))
help
Generate DWARF v4 debug info. This requires gcc 4.5+ and gdb 7.0+.
Generate DWARF v4 debug info. This requires gcc 4.5+, binutils 2.35.2
if using clang without clang's integrated assembler, and gdb 7.0+.
If you have consumers of DWARF debug info that are not ready for
newer revisions of DWARF, you may wish to choose this or have your
......
DEBUG_CFLAGS := -g
DEBUG_CFLAGS :=
debug-flags-y := -g
ifdef CONFIG_DEBUG_INFO_SPLIT
DEBUG_CFLAGS += -gsplit-dwarf
endif
ifndef CONFIG_AS_IS_LLVM
KBUILD_AFLAGS += -Wa,-gdwarf-2
endif
ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
debug-flags-$(CONFIG_DEBUG_INFO_DWARF4) += -gdwarf-4
debug-flags-$(CONFIG_DEBUG_INFO_DWARF5) += -gdwarf-5
ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_AS_IS_GNU),yy)
# Clang does not pass -g or -gdwarf-* option down to GAS.
# Add -Wa, prefix to explicitly specify the flags.
KBUILD_AFLAGS += $(addprefix -Wa$(comma), $(debug-flags-y))
endif
DEBUG_CFLAGS += $(debug-flags-y)
KBUILD_AFLAGS += $(debug-flags-y)
ifdef CONFIG_DEBUG_INFO_REDUCED
DEBUG_CFLAGS += -fno-var-tracking
......
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