* gcc/cp/parser.c (cp_parser_declaration): Handle 'inline namespace'.
        (cp_parser_namespace_definition): Likewise.
  
        PR c++/33486
        * gcc/cp/name-lookup.c (arg_assoc_namespace): Look down into inline
        namespaces, too.
  
        * libstdc++-v3/include/bits/c++config: Use 'inline namespace'
        instead of strong using.

From-SVN: r132611