linux-kernel - Re: [PATCH 2/2] Kbuild: Add a option to enable dwarf4

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Date:	Wed, 30 Jul 2014 15:38:24 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Andi Kleen <andi@...stfloor.org>
CC:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/2] Kbuild: Add a option to enable dwarf4

On 2014-07-30 01:11, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.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@...ux.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
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