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kbuild: move -gsplit-dwarf, -gdwarf-4 option tests to Kconfig

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CONFIG_DEBUG_INFO_SPLIT and CONFIG_DEBUG_INFO_DWARF4 enable extra
dwarf options if supported. You never know if they are really enabled
since Makefile may silently turn them off.

The actual behavior will match to the kernel configuration by
testing those compiler flags in the Kconfig stage.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2019-02-22 16:56:09 +09:00
parent 117948ac74
commit 9d93744400
2 changed files with 4 additions and 2 deletions
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4
Makefile
View File

@ -742,14 +742,14 @@ DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
ifdef CONFIG_DEBUG_INFO
ifdef CONFIG_DEBUG_INFO_SPLIT
DEBUG_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
DEBUG_CFLAGS += -gsplit-dwarf
else
DEBUG_CFLAGS += -g
endif
KBUILD_AFLAGS += -Wa,-gdwarf-2
endif
ifdef CONFIG_DEBUG_INFO_DWARF4
DEBUG_CFLAGS += $(call cc-option, -gdwarf-4,)
DEBUG_CFLAGS += -gdwarf-4
endif
ifdef CONFIG_DEBUG_INFO_REDUCED

2
lib/Kconfig.debug
View File

@ -179,6 +179,7 @@ config DEBUG_INFO_REDUCED
config DEBUG_INFO_SPLIT
bool "Produce split debuginfo in .dwo files"
depends on DEBUG_INFO
depends on $(cc-option,-gsplit-dwarf)
help
Generate debug info into separate .dwo files. This significantly
reduces the build directory size for builds with DEBUG_INFO,
@ -194,6 +195,7 @@ config DEBUG_INFO_SPLIT
config DEBUG_INFO_DWARF4
bool "Generate dwarf4 debuginfo"
depends on DEBUG_INFO
depends on $(cc-option,-gdwarf-4)
help
Generate dwarf4 debug info. This requires recent versions
of gcc and gdb. It makes the debug information larger.