[oe] OABI/EABI specific autotools settings

[Gergely Kis]

Hello,

I was trying to use Orbit2 on an ARM EABI system (Openmoko 2007.2 on
QEMU), but I ran into alignment issues: the autotools presets in
site/arm-common assumed OABI structure alignment. The following
trivial patch fixed it for my build, but it is not suitable for
merging into OE, because it would break OABI builds. Therefore I would
like to propose a change which allows using different presets for EABI
and OABI builds. Basically the idea is to use the following files:

arm-common - non-ABI specific presets
arm-oabi-common - OABI presets
arm-eabi-common - EABI presets

arm-linux - non ABI specific presets
arm-oabi-linux - OABI presets
arm-eabi-linux - EABI presets

Actually the oabi/eabi files should only hold a handful of
declarations, mainly structure alignment settings.

What do you think? Would you accept a patch which implements the above
structure? Or is there a better method to support this?

The actual patch to arm-common is attached.

Best Regards,
Gergely
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