re PR c++/8266 (Explicit instantiation of a template outside its namespace is broken)

From  Giovanni Bajo  <giovannibajo@libero.it>
cp:
       PR c++/8266
        * pt.c (check_explicit_specialization): When looking up a
        template function from an identifier outside class-scope, bind
        it to CP_DECL_CONTEXT.
testsuite:
        PR c++/8266
        * g++.dg/template/explicit-instantiation3.C: New test.

From-SVN: r68527

gcc/cp/ChangeLog

+2003-06-26  Giovanni Bajo  <giovannibajo@libero.it>
+
+        PR c++/8266
+        * pt.c (check_explicit_specialization): When looking up a
+        template function from an identifier outside class-scope, bind
+        it to CP_DECL_CONTEXT.
+
 2003-06-25  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/10990

gcc/cp/pt.c

@@ -1629,15 +1629,21 @@ check_explicit_specialization (tree declarator,
 	{
 	  tree fns;
 
-	  my_friendly_assert (TREE_CODE (declarator) == IDENTIFIER_NODE, 
-			      0);
-	  if (!ctype)
-	    fns = IDENTIFIER_NAMESPACE_VALUE (dname);
-	  else
+	  my_friendly_assert (TREE_CODE (declarator) == IDENTIFIER_NODE, 0);
+	  if (ctype)
 	    fns = dname;
+	  else
+	    {
+	      /* If there is no class context, the explicit instantiation
+                 must be at namespace scope.  */
+	      my_friendly_assert (DECL_NAMESPACE_SCOPE_P (decl), 20030625);
+
+	      /* Find the namespace binding, using the declaration
+                 context.  */
+	      fns = namespace_binding (dname, CP_DECL_CONTEXT (decl));
+	    }
 
-	  declarator = 
-	    lookup_template_function (fns, NULL_TREE);
+	  declarator = lookup_template_function (fns, NULL_TREE);
 	}
 
       if (declarator == error_mark_node)

gcc/testsuite/ChangeLog

+2003-06-26  Giovanni Bajo  <giovannibajo@libero.it>
+
+        PR c++/8266
+        * g++.dg/template/explicit-instantiation3.C: New test.
+
 2003-06-26  Eric Botcazou <ebotcazou@libertysurf.fr>
 
 	* gcc.dg/20030626-1.c: Use signed char.

gcc/testsuite/g++.dg/template/explicit-instantiation3.C

+// { dg-do compile }
+// Origin: <sebor at roguewave dot com>
+// c++/8266: Explicit instantiation of a template outside its namespace is
+//  broken
+
+namespace N
+{
+  template <class T> T foo (T)
+  { return T (); }
+
+  struct A
+  {
+    template <int N>
+    struct B {};
+  };
+
+  template <int M>
+  struct C {};
+
+  template double foo(double);
+  template float  foo<float>(float);
+  template struct A::B<0>;
+  template struct C<0>;
+}
+
+template int    N::foo(int);
+template char   N::foo<char>(char);
+template struct N::A::B<1>;
+template struct N::C<1>;
+
+