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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/56480] Explicit specialization in a namespace enclosing the specialized template
Date: Sat, 01 Nov 2014 18:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56480

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
                 CC|                            |jason at gcc dot gnu.org

--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Two possible fixes: 

1)
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 2cf10f442f68..09a545496fa8 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -785,8 +785,12 @@ check_specialization_namespace (tree tmpl)
     return true;
   else
     {
-      permerror (input_location, "specialization of %qD in different
namespace", tmpl);
-      permerror (input_location, "  from definition of %q+#D", tmpl);
+      if (cxx_dialect < cxx11)
+       {
+         permerror (input_location, "specialization of %qD in different "
+                    "namespace", tmpl);
+         permerror (input_location, "  from definition of %q+#D", tmpl);
+       }
       return false;
     }
 }

2)
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 2cf10f442f68..1171b5d736d5 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -780,15 +780,15 @@ check_specialization_namespace (tree tmpl)
       error ("specialization of %qD must appear at namespace scope", tmpl);
       return false;
     }
-  if (is_associated_namespace (current_namespace, tpl_ns))
-    /* Same or super-using namespace.  */
-    return true;
-  else
+  if (!is_associated_namespace (current_namespace, tpl_ns) &&
+      (cxx_dialect < cxx11))
     {
       permerror (input_location, "specialization of %qD in different
namespace", tmpl);
       permerror (input_location, "  from definition of %q+#D", tmpl);
       return false;
     }
+
+  return true;
 }

 /* SPEC is an explicit instantiation.  Check that it is valid to


The following testcases:

g++.dg/template/spec17.C
g++.dg/template/spec25.C
g++.dg/template/spec36.C
g++.old-deja/g++.ns/template13.C
g++.old-deja/g++.pt/explicit73.C 
g++.old-deja/g++.pt/lookup10.C

would have to be updated.