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

[Thilo Fromm]

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.

Regards,
Thilo

-- 
Dipl.-Ing (FH) Thilo Fromm, MSc., Embedded Systems Developer
DResearch Digital Media Systems GmbH
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