The patch titled
Subject: kbuild: add debug level and macro defs options
has been added to the -mm mm-nonmm-unstable branch. Its filename is
kbuild-add-debug-level-and-macro-defs-options.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kbuild-add-debug-level-and-macro-defs-options.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Dmitrii Bundin <dmitrii.bundin.a@xxxxxxxxx>
Subject: kbuild: add debug level and macro defs options
Date: Mon, 15 Aug 2022 04:33:17 +0300
Add config options to control debug info level and producing of macro
definitions for GCC/Clang.
Option DEBUG_INFO_LEVEL is responsible for controlling debug info level.
Before GCC 11 and Clang 12 -gsplit-dwarf implicitly uses -g2. To provide
a way to override the setting with, e.g. -g1, DEBUG_INFO_LEVEL is set
independently from DEBUG_INFO_SPLIT.
Option DEBUG_MACRO_DEFINITIONS is responsible for controlling inclusion of
macro definitions. Since Clang uses -fdebug-macro to control if macro
definitions are produced which is different from GCC, provides a
compiler-specific way of handling macro inclusion. The option is handled
after DEBUG_INFO_LEVEL since -g3 -g2 implies -g2, but -g2 -g3 implies -g3
and GCC uses -g3 to produce macro definitions.
Link: https://lkml.kernel.org/r/20220815013317.26121-1-dmitrii.bundin.a@xxxxxxxxx
Signed-off-by: Dmitrii Bundin <dmitrii.bundin.a@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Fangrui Song <maskray@xxxxxxxxxx>
Cc: Isabella Basso <isabbasso@xxxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: Michal Marek <michal.lkml@xxxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig.debug | 20 ++++++++++++++++++++
scripts/Makefile.debug | 12 ++++++++++--
2 files changed, 30 insertions(+), 2 deletions(-)
--- a/lib/Kconfig.debug~kbuild-add-debug-level-and-macro-defs-options
+++ a/lib/Kconfig.debug
@@ -304,6 +304,26 @@ config DEBUG_INFO_REDUCED
DEBUG_INFO build and compile times are reduced too.
Only works with newer gcc versions.
+config DEBUG_INFO_LEVEL
+ int "Debug info level"
+ range 1 3
+ default "2"
+ help
+ Sets the level of how much debug information to generate (-glevel).
+ Level 1 produces minimal debug information without including information
+ about local variables. Level 3 includes extra information like macro
+ definitions. Setting up level 3 will require significantly more disk
+ space and increase built time.
+
+config DEBUG_MACRO_DEFINITIONS
+ bool "Add macro definitions to debug info"
+ default n
+ help
+ Generates macro definitions to provide a way to expand macros right
+ in the debugging session. This information can be used with macro expand,
+ info macro in gdb. This option is equivalent to setting -g3 in GCC and
+ -fdebug-macro in Clang.
+
config DEBUG_INFO_COMPRESSED
bool "Compressed debugging information"
depends on $(cc-option,-gz=zlib)
--- a/scripts/Makefile.debug~kbuild-add-debug-level-and-macro-defs-options
+++ a/scripts/Makefile.debug
@@ -2,8 +2,6 @@ DEBUG_CFLAGS :=
ifdef CONFIG_DEBUG_INFO_SPLIT
DEBUG_CFLAGS += -gsplit-dwarf
-else
-DEBUG_CFLAGS += -g
endif
ifndef CONFIG_AS_IS_LLVM
@@ -16,6 +14,16 @@ dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5
DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
endif
+DEBUG_CFLAGS += -g$(CONFIG_DEBUG_INFO_LEVEL)
+ifdef CONFIG_DEBUG_MACRO_DEFINITIONS
+ifdef CONFIG_CC_IS_GCC
+DEBUG_CFLAGS += -g3
+endif
+ifdef CONFIG_CC_IS_CLANG
+DEBUG_CFLAGS += -fdebug-macro
+endif
+endif
+
ifdef CONFIG_DEBUG_INFO_REDUCED
DEBUG_CFLAGS += -fno-var-tracking
ifdef CONFIG_CC_IS_GCC
_
Patches currently in -mm which might be from dmitrii.bundin.a@xxxxxxxxx are
kbuild-add-debug-level-and-macro-defs-options.patch
