[Bug c++/67074] Name lookup ambiguity between namespace and its alias

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67074

--- Comment #2 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Author: nathan
Date: Tue Jun 20 12:53:11 2017
New Revision: 249408

URL: https://gcc.gnu.org/viewcvs?rev=249408&root=gcc&view=rev
Log:
        PR c++/67074 - namespace aliases
        * decl.c (duplicate_decls): Don't error here on mismatched
        namespace alias.
        * name-lookup.c (name_lookup::add_value): Matching namespaces are
        not ambiguous.
        (diagnose_name_conflict): Namespaces are never redeclarations.
        (update_binding): An alias can match a real namespace.

        PR c++/67074
        * g++.dg/lookup/pr67074.C: New.
        * g++.dg/parse/namespace-alias-1.C: Adjust.

Added:
    trunk/gcc/testsuite/g++.dg/lookup/pr67074.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/decl.c
    trunk/gcc/cp/name-lookup.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/parse/namespace-alias-1.C