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

[Khem Raj]

On Mon, Oct 4, 2010 at 1:08 AM, Thilo Fromm <t.fromm at 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.

>
> Regards,
> Thilo
>
> --
> Dipl.-Ing (FH) Thilo Fromm, MSc., Embedded Systems Developer
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