[ARM] EABI and the default to short enums

[Ian Lance Taylor]

Sebastian Huber <sebastian.huber@embedded-brains.de> writes:

> I mean the ABI described in "Procedure Call Standard for the ARM
> Architecture" document number "ARM IHI 0042D, current through ABI
> release 2.08".  In GCC this is ARM_ABI_AAPCS and ARM_ABI_AAPCS_LINUX?

That is my understanding, yes.


> This is not hacking.  It is making a choice between two alternatives
> described in the document issued by ARM.  See also section 7.1.3
> "Enumerated Types"
>
> http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042d/IHI0042D_aapcs.pdf
>
> For RTEMS it is surely not the worst choice to use the Linux variant
> of the EABI since a lot of software is developed for and tested with
> it.

Ouch, I did not know that the EABI left this open.  That seems like a
bug, because it prevents code from being interoperable.  This is
precisely the kind of thing an ABI should address.  Does anybody know
why they did this?

Ian