In gcc/objc/:
2010-11-27  Nicola Pero  <nicola.pero@meta-innovation.com>

        Implemented optional properties.
        * objc-act.h (PROPERTY_OPTIONAL): New.
        * objc-act.c (objc_add_property_declaration): Set
        PROPERTY_OPTIONAL if appropriate.
        (finish_class): When generating definitions of setter and getter
        methods associated with a property for a protocol, mark them as
        optional if the property is optional.
        (maybe_make_artificial_property_decl): Added 'getter_name'
        argument.  Set PROPERTY_OPTIONAL.
        (objc_maybe_build_component_ref): Updated calls to
        maybe_make_artificial_property_decl.  Added code for optional,
        readonly properties.
        (objc_build_class_component_ref): Updated call to
        maybe_make_artificial_property_decl.

In gcc/testsuite/:
2010-11-27  Nicola Pero  <nicola.pero@meta-innovation.com>

        * objc.dg/property/at-property-24.m: New.
        * objc.dg/property/at-property-25.m: New.
        * obj-c++.dg/property/at-property-24.mm: New.
        * obj-c++.dg/property/at-property-25.mm: New.

From-SVN: r167197