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Commit 866ced95 authored by Andi Kleen's avatar Andi Kleen Committed by Michal Marek
Browse files

kbuild: Support split debug info v4 

This is an alternative approach to lower the overhead of debug info
(as we discussed a few days ago)

gcc 4.7+ and newer binutils have a new "split debug info" debug info
model where the debug info is only written once into central ".dwo" files.

This avoids having to copy it around multiple times, from the object
files to the final executable. It lowers the disk space
requirements. In addition it defaults to compressed debug data.

More details here: http://gcc.gnu.org/wiki/DebugFission

This patch adds a new option to enable it. It has to be an option,
because it'll undoubtedly break everyone's debuginfo packaging scheme.
gdb/objdump/etc. all still work, if you have new enough versions.

I don't see big compile wins (maybe a second or two faster or so), but the
object dirs with debuginfo get significantly smaller. My standard kernel
config (slightly bigger than defconfig) shrinks from 2.9G disk space
to 1.1G objdir (with non reduced debuginfo). I presume if you are IO limited
the compile time difference will be larger.

Only problem I've seen so far is that it doesn't play well with older
versions of ccache (apparently fixed, see
https://bugzilla.samba.org/show_bug.cgi?id=10005

)

v2: various fixes from Dirk Gouders. Improve commit message slightly.
v3: Fix clean rules and improve Kconfig slightly
v4: Fix merge error in last version (Sam Ravnborg)
    Clarify description that it mainly helps disk size.
Cc: Dirk Gouders <dirk@gouders.net>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
Acked-by: default avatarSam Ravnborg <sam@ravnborg.org>
Signed-off-by: default avatarMichal Marek <mmarek@suse.cz>
parent 011bf125

.gitignore

+1 −0
Original line number Original line Diff line number Diff line
@@ -34,6 +34,7 @@ 
*.gcno

*.gcno

modules.builtin

modules.builtin

Module.symvers

Module.symvers

*.dwo





#

#

# Top-level generic files

# Top-level generic files

Makefile

+5 −0
Original line number Original line Diff line number Diff line
@@ -684,7 +684,11 @@ endif 
endif

endif





ifdef CONFIG_DEBUG_INFO

ifdef CONFIG_DEBUG_INFO

ifdef CONFIG_DEBUG_INFO_SPLIT

KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)

else

KBUILD_CFLAGS	+= -g

KBUILD_CFLAGS	+= -g

endif

KBUILD_AFLAGS	+= -Wa,-gdwarf-2

KBUILD_AFLAGS	+= -Wa,-gdwarf-2

endif

endif
@@ -1372,6 +1376,7 @@ clean: $(clean-dirs) 
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \

	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \

		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \

		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \

		-o -name '*.ko.*' \

		-o -name '*.ko.*' \

		-o -name '*.dwo'  \

		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \

		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \

		-o -name '*.symtypes' -o -name 'modules.order' \

		-o -name '*.symtypes' -o -name 'modules.order' \

		-o -name modules.builtin -o -name '.tmp_*.o.*' \

		-o -name modules.builtin -o -name '.tmp_*.o.*' \

lib/Kconfig.debug

+15 −0
Original line number Original line Diff line number Diff line
@@ -143,6 +143,21 @@ config DEBUG_INFO_REDUCED 
	  DEBUG_INFO build and compile times are reduced too.

	  DEBUG_INFO build and compile times are reduced too.

	  Only works with newer gcc versions.

	  Only works with newer gcc versions.





config DEBUG_INFO_SPLIT

	bool "Produce split debuginfo in .dwo files"

	depends on DEBUG_INFO

	help

	  Generate debug info into separate .dwo files. This significantly

	  reduces the build directory size for builds with DEBUG_INFO,

	  because it stores the information only once on disk in .dwo

	  files instead of multiple times in object files and executables.

	  In addition the debug information is also compressed.



	  Requires recent gcc (4.7+) and recent gdb/binutils.

	  Any tool that packages or reads debug information would need

	  to know about the .dwo files and include them.

	  Incompatible with older versions of ccache.



config ENABLE_WARN_DEPRECATED

config ENABLE_WARN_DEPRECATED

	bool "Enable __deprecated logic"

	bool "Enable __deprecated logic"

	default y

	default y