ObjC / ObjC++: fix implementation of @optional in @protocol

["Nicola Pero" <nicola dot pero at meta-innovation dot com>]

This patch adds a couple of testcases for the usage of @optional in @protocol
(another new syntax allowed in "Objective-C 2.0" that is now available in GCC)
and fixes/completes the implementation so that the testcases actually work :-)

Ok to commit to trunk ?

Thanks

In gcc/objc/:
2010-11-16  Nicola Pero  <nicola.pero@meta-innovation.com>

        * objc-act.c (lookup_method_in_protocol_list): Search methods in
        PROTOCOL_OPTIONAL_CLS_METHODS / PROTOCOL_OPTIONAL_NST_METHODS if
        they are not found in PROTOCOL_CLS_METHODS / PROTOCOL_NST_METHODS.

In gcc/testsuite/:
2010-11-16  Nicola Pero  <nicola.pero@meta-innovation.com>

        * objc.dg/protocol-optional-1.m: New.
        * obj-c++.dg/protocol-optional-1.mm: New.

Attachment: patch.txt
Description: Text document