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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>
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Makefile
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Makefile
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@ -691,6 +691,9 @@ KBUILD_CFLAGS += -g
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endif
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KBUILD_AFLAGS += -Wa,-gdwarf-2
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endif
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ifdef CONFIG_DEBUG_INFO_DWARF4
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KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
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endif
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ifdef CONFIG_DEBUG_INFO_REDUCED
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KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
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@ -158,6 +158,15 @@ config DEBUG_INFO_SPLIT
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to know about the .dwo files and include them.
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Incompatible with older versions of ccache.
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config DEBUG_INFO_DWARF4
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bool "Generate dwarf4 debuginfo"
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depends on DEBUG_INFO
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help
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Generate dwarf4 debug info. This requires recent versions
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of gcc and gdb. It makes the debug information larger.
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But it significantly improves the success of resolving
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variables in gdb on optimized code.
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config ENABLE_WARN_DEPRECATED
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bool "Enable __deprecated logic"
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default y
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