[PATCH] Disable EHABI when -fno-exceptions option is chosen.

[Renato Golin]

On 3 February 2014 17:31, Keith Walker <kwalker at arm.com> wrote:

> Should the EHABI directives (.fnstart/.fnend/.push/.pad/.setfp etc)
> always be generated (and thus resulting in the generation of .ARM.extab &
> .ARM.exidx sections), or should these directives only be generated when
> there are unwind tables to be described?
>

Hi Keith,

AFAIK, .ARM.exidx only needs to exist when there is one of more of
.ARM.extab, which is only needed if there are functions that need unwinding
because of exception handling (C++) code. The fact that we are always
generating is probably due to the fact that EHABI was never on by default
so it never needed to check if it *should* generate the table or not, and
always did.

I'll have a look on how to only enable it the function doesn't have
nounwind attribute. I don't know the role of -munwind-tables on the
attribute, but we should generate them if on.

cheers,
--renato
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