CUMULATIVE_ARGS in hooks (Was: RFC: semi-automatic hookization)

[Joern Rennecke]

Quoting Nathan Froyd <froydnj@codesourcery.com>:

> On Tue, Nov 16, 2010 at 10:22:00PM -0500, Joern Rennecke wrote:
...
>> Does that mean you acknowledge that we shouldn't have CUMULATIVE_ARGS
>> taking hooks in the global target vector?
>
> Maybe?  I think the methods discussed in this thread would be better for
> when we do move to C++.  I don't think your original proposal or
> anything that sacrifices the type-safety of the current interface is the
> way forward.

You can find my original proposal fleshed out here:
http://gcc.gnu.org/ml/gcc-patches/2010-11/msg01769.html

I have also made an alternate proposal that keeps type safety, and regains
dependency sanity by moving the CUMULATIVE_ARGS taking hooks out of targetm:
http://gcc.gnu.org/ml/gcc-patches/2010-11/msg01810.html

This is conceptually closer to the C++ proposals; the new target_internalm
hook vector serves a similar purpose as a vtable for a cumulative_arg
class object.