Re: [PATCH] libunwind: force gcc to be built first

[Tom Rini <tom_rini@mentor.com>]

On 02/14/2011 01:32 AM, Steffen Sledz wrote:
> Am 04.10.2010 18:00, schrieb Khem Raj:
>> On Mon, Oct 4, 2010 at 1:08 AM, Thilo Fromm<t.fromm@dresearch.de>  wrote:
>>> Hello Frans,
>>>
>>>>>> I tracked it down - libunwind publishes unwind.h, and gcc uses an
>>>>>> internal
>>>>>> file of the same name while being built.
>>>>>
>>>>> Yes gcc has its own version of libunwind which it used unless
>>>>> configured with --with-system-libunwind
>>>>> IIUC the problem happens with target gcc not with cross-gcc. target
>>>>> gcc is built using cross-gcc and
>>>>> <sysroot>/use/include could be preferred over the location of
>>>>> libunwind.h which is in gcc sources
>>>>> If thats the case then we need to fix gcc build to not look into
>>>>> standard sysroot/usr/include but prefer
>>>>> the local unwind.h when its using internal libunwind. The problem
>>>>> would not show up if the libunwind versions
>>>>> were matching but that may not be the case always and I dont know of
>>>>> hand how we can fix the gcc configury/build
>>>>> to ignore installed unwind.h
>>>>>
>>>>> You workaround would only work if build sequence was followed if some
>>>>> one just cleaned gcc and rebuild it
>>>>> the problem will resurface.
>>>>>
>>>> Thanks for the analysis Khem.
>>>> This is indeed more or less what I had expected.
>>>>
>>>> For me this patch gets a NAK as it does only masks the problvem in
>>>> some cases but not really solves it.
>>>
>>> You're right with this analysis; however, the patch enables Openembedded to
>>> be built *at all*. If you care less about whether you're able to actually
>>> build and if you have the time to wait until someone ventures deep into the
>>> gcc build and fixes the cause, then this is the way to go.
>>>
>>> For us, however, this patch is a valid workaround. It will make Openembedded
>>> work for us until the original issue is fixed.
>>
>> I think we should try to fix it in right way.
>
> Ping!

Can you re-submit so it (a) hits patchwork again and (b) consolidate the 
what's and whys and so forth in the commit message, if needed?  Thanks!

-- 
Tom Rini
Mentor Graphics Corporation