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Commit bfaf2dd3 authored Jul 30, 2014 by Andi Kleen Committed by Michal Marek Jul 30, 2014

Kbuild: Add a option to enable dwarf4 v2



I found that a lot of unresolvable variables when using gdb on the
kernel become resolvable when dwarf4 is enabled. So add a Kconfig flag
to enable it.

It definitely increases the debug information size, but on the other
hand this isn't so bad when debug fusion is used.

v2: Use cc-option
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>

parent 866ced95

Makefile

+3 −0

Original line number	Diff line number	Diff line
		@@ -691,6 +691,9 @@ KBUILD_CFLAGS += -g
		endif
		KBUILD_AFLAGS += -Wa,-gdwarf-2
		endif
		ifdef CONFIG_DEBUG_INFO_DWARF4
		KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
		endif

		ifdef CONFIG_DEBUG_INFO_REDUCED
		KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \

lib/Kconfig.debug

+9 −0

Original line number	Diff line number	Diff line
		@@ -158,6 +158,15 @@ config DEBUG_INFO_SPLIT
		to know about the .dwo files and include them.
		Incompatible with older versions of ccache.

		config DEBUG_INFO_DWARF4
		bool "Generate dwarf4 debuginfo"
		depends on DEBUG_INFO
		help
		Generate dwarf4 debug info. This requires recent versions
		of gcc and gdb. It makes the debug information larger.
		But it significantly improves the success of resolving
		variables in gdb on optimized code.

		config ENABLE_WARN_DEPRECATED
		bool "Enable __deprecated logic"
		default y