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Sender: Andrew Haley <aph@zebedee.pink>
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Subject: Re: More Ganssle on Ada
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Date: 2013-01-24T06:18:08-06:00
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Lucretia <laguest9000@googlemail.com> wrote:
> Ok, let's sort this once and for all.
> 
> Building an ARM Linux compiler is doable now. The only problem with
> it is that it doesn't use the unwind-arm.[ch] files in
> gcc/config/arm but does implement exceptions with setjmp/longjmp.
> 
> I ave tried to sort this out, it requires someone with more
> knowledge of the RTS than me. Basically, what needs to be done to
> sort this out is to move the current DWARF EH code into a new
> package, and create an ARM equivalent, this is because the standard
> unwind and the unwind-arm stuff is very different and the data would
> be wrong on the Ada side.
> 
> I submitted a patch to the GCC ML which does the first part and kind
> of works, but fails in the end. The response from AdaCore was
> something along the lines "you need to construct and ARM specific
> exception object," thanks, very helpful.

I remember offering to help someone do this, but it all went quiet.
It's not terribly difficult: a simple worked example of the changes
needed is in
http://gcc.gnu.org/viewcvs/trunk/libjava/exception.cc?view=markup

... just look for ifdef __ARM_EABI_UNWINDER__

Andrew.