Patch to allow more granular aborting.

[Marc Glisse]

On Mon, 14 Mar 2011, Niels Möller wrote:

> 1. About out-of-memory.
>
> Can you explain why the current interface doesn't suffice? You can
> provide your own allocation function, and make them raise an error in
> any way you please on failure, instead of returning NULL to the caller.

I think PPL does something like that. It requires GMP to be compiled with 
-fexceptions so it can throw a C++ exception from the allocator.

But because of the way things are currently, if we want to continue after 
such an error, we have to either accept a possible memory leak or 
reinitialize the allocator (and forget all existing variables). Or maybe 
wrap all gmp calls to remember the status of the allocator before the 
call. (or compile gmp with a C++ compiler and tweak a bit the temp 
allocation macros)

> 2. And this patch, for __gmp_invalid_operation

Looks like it would be simpler to make this function overridable, somewhat 
like the allocation functions. For some reason, LD_PRELOAD wasn't able to 
replace it on my system :-(

-- 
Marc Glisse