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| author | Andi Kleen <ak@linux.intel.com> | 2014-07-30 20:50:19 +0200 |
|---|---|---|
| committer | Michal Marek <mmarek@suse.cz> | 2014-07-30 22:56:04 +0200 |
| commit | bfaf2dd3509bc73bf4a4cea0e72472755ed860e2 (patch) | |
| tree | e7ceb98352696ee3aa373a7559227a361983f31c | |
| parent | kbuild: Support split debug info v4 (diff) | |
| download | linux-bfaf2dd3509bc73bf4a4cea0e72472755ed860e2.tar.xz linux-bfaf2dd3509bc73bf4a4cea0e72472755ed860e2.zip | |
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>
| -rw-r--r-- | Makefile | 3 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 9 |
2 files changed, 12 insertions, 0 deletions
@@ -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) \ diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 910355da9d14..d70f203ce710 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -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 |