re PR c++/60390 ([c++1y] ICE with declaring function with auto parameter as friend)

Fix PR c++/60390

	PR c++/60390
	* parser.c (cp_parser_member_declaration): Don't allow
	finish_fully_implicit_template to consider friend declarations to be
	class member templates.
	(synthesize_implicit_template_parm): Handling winding back through class
	scope to the class being defined in order to inject a template argument
	list.

	PR c++/60390
	* g++.dg/cpp1y/pr60390.C: New testcase.

From-SVN: r208625

gcc/cp/ChangeLog

 2014-03-17  Adam Butcher  <adam@jessamine.co.uk>
 
+	PR c++/60390
+	* parser.c (cp_parser_member_declaration): Don't allow
+	finish_fully_implicit_template to consider friend declarations to be
+	class member templates.
+	(synthesize_implicit_template_parm): Handling winding back through class
+	scope to the class being defined in order to inject a template argument
+	list.
+
 	PR c++/60391
 	* parser.c (cp_parser_skip_to_end_of_block_or_statement): Unwind generic
 	function scope as per cp_parser_skip_to_end_of_statement.

gcc/cp/parser.c

@@ -20527,8 +20527,13 @@ cp_parser_member_declaration (cp_parser* parser)
 	      decl = grokfield (declarator, &decl_specifiers,
 				initializer, /*init_const_expr_p=*/true,
 				asm_specification, attributes);
-		if (parser->fully_implicit_function_template_p)
-		  decl = finish_fully_implicit_template (parser, decl);
+	      if (parser->fully_implicit_function_template_p)
+		{
+		  if (friend_p)
+		    finish_fully_implicit_template (parser, 0);
+		  else
+		    decl = finish_fully_implicit_template (parser, decl);
+		}
 	    }
 
 	  cp_finalize_omp_declare_simd (parser, decl);
@@ -31982,13 +31987,32 @@ synthesize_implicit_template_parm  (cp_parser *parser)
 	  parent_scope = scope;
 	  scope = scope->level_chain;
 	}
-      if (current_class_type && !LAMBDA_TYPE_P (current_class_type)
-	  && parser->num_classes_being_defined == 0)
-	while (scope->kind == sk_class)
-	  {
-	    parent_scope = scope;
-	    scope = scope->level_chain;
-	  }
+      if (current_class_type && !LAMBDA_TYPE_P (current_class_type))
+	{
+	  /* If not defining a class, then any class scope is a scope level in
+	     an out-of-line member definition.  In this case simply wind back
+	     beyond the first such scope to inject the template argument list.
+	     Otherwise wind back to the class being defined.  The latter can
+	     occur in class member friend declarations such as:
+
+	       class A {
+		 void foo (auto);
+	       };
+	       class B {
+		 friend void A::foo (auto);
+	       };
+
+	    The template argument list synthesized for the friend declaration
+	    must be injected in the scope of 'B', just beyond the scope of 'A'
+	    introduced by 'A::'.  */
+
+	  while (scope->kind == sk_class
+		 && !TYPE_BEING_DEFINED (scope->this_entity))
+	    {
+	      parent_scope = scope;
+	      scope = scope->level_chain;
+	    }
+	}
 
       current_binding_level = scope;
 

gcc/testsuite/ChangeLog

 2014-03-17  Adam Butcher  <adam@jessamine.co.uk>
 
+	PR c++/60390
+	* g++.dg/cpp1y/pr60390.C: New testcase.
+
 	PR c++/60391
 	* g++.dg/cpp1y/pr60391.C: New testcase.
 

gcc/testsuite/g++.dg/cpp1y/pr60390.C

+// PR c++/60390
+// { dg-do compile { target c++1y } }
+// { dg-options "" }
+
+struct A
+{
+  void foo (auto);
+};
+
+class B
+{
+  int m;
+  friend void A::foo (auto);
+};
+
+void A::foo (auto i)
+{
+  B b;
+  b.m = i;
+}
+
+int main ()
+{
+  A a;
+  a.foo (7);
+}