| Message ID | 1406675493-2539-2-git-send-email-andi@firstfloor.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 2014-07-30 01:11, Andi Kleen wrote: > From: Andi Kleen <ak@linux.intel.com> > > 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. > > Signed-off-by: Andi Kleen <ak@linux.intel.com> > --- > Makefile | 3 +++ > lib/Kconfig.debug | 9 +++++++++ > 2 files changed, 12 insertions(+) > > diff --git a/Makefile b/Makefile > index 6a717cd..6cdf3f0 100644 > --- a/Makefile > +++ b/Makefile > @@ -696,6 +696,9 @@ KBUILD_CFLAGS += -g > endif > KBUILD_AFLAGS += -Wa,-gdwarf-2 > endif > +ifdef CONFIG_DEBUG_INFO_DWARF4 > +KBUILD_CFLAGS += -gdwarf-4 > +endif Make it $(call cc-option,-gdwarf-4), so as not to break allmodconfig with older GCCs. Otherwise the patch is OK. Michal -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Makefile b/Makefile index 6a717cd..6cdf3f0 100644 --- a/Makefile +++ b/Makefile @@ -696,6 +696,9 @@ KBUILD_CFLAGS += -g endif KBUILD_AFLAGS += -Wa,-gdwarf-2 endif +ifdef CONFIG_DEBUG_INFO_DWARF4 +KBUILD_CFLAGS += -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 0360468..a2dcf97 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