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

[Steffen Sledz <sledz@dresearch.de>]

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!

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