[Buildroot] [PATCH 12/12] toolchain: improve mudflap support
Arnout Vandecappelle
arnout at mind.be
Thu Aug 29 06:18:43 UTC 2013
On 08/28/13 08:35, Thomas Petazzoni wrote:
> The mudflap library is only useful if one uses the -fmudflap gcc
> option, to do more checks on pointers/arrays, which is typically not
> the case.
>
> This commit:
>
> * Adds an option to enable/disable mudflap support at the gcc
> level. By default, it is disabled, which saves a little bit of
> build time.
>
> * Adds a way for the external toolchain backend to tell whether
> mudflap is supported or not by the external toolchain.
>
> * Adds a global BR2_TOOLCHAIN_HAS_MUDFLAP hidden option, that
> indicates whether the toolchain (internal or external) supports
> mudflap.
>
> * Adds a global BR2_ENABLE_MUDFLAP in "Build options" that allows the
> user to build all packages with mudflap support. It depends on
> BR2_TOOLCHAIN_HAS_MUDFLAP.
>
> WARNING WARNING: this currently doesn't result into a working system,
> even with just Busybox. Busybox init crashes with "/sbin/init: symbol
> lookup error: /lib/libmudflapth.so.0: undefined symbol:
> main". According to
> http://gcc.gnu.org/ml/gcc-help/2008-03/msg00165.html it is caused by
> -Wl,--gc-sections (which is used by Busybox), but even after removing
> it, it still doesn't work. I don't personaly have much interest in
> mudflap support, so as I couldn't get it to work easily, my suggestion
> would be to drop support for it entirely, unless someone steps up to
> fix this issue.
I would drop the option to enable -fmudflap globally, but keep the
option to build mudflap support in the internal toolchain. As you wrote
in another mail, mudflap is a debugging tool and not really a hardening
tool like SSP.
Regards,
Arnout
--
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286500
Essensium/Mind http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
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