re PR c++/16623 (g++ ICE in tsubst_decl:6081)

	PR c++/16623
	* cp-tree.h (lang_type_class): Add lazy_assignment_op.
	(CLASSTYPE_LAZY_ASSIGNMENT_OP): New macro.
	* class.c (add_implicitly_declared_members): Use
	CLASSTYPE_LAZY_ASSIGNMENT_OP.
	* method.c (lazily_declare_fn): Clear
	CLASSTYPE_LAZY_ASSIGNMENT_OP.
	* search.c (lookup_fnfields_1): Check it.

From-SVN: r84956

gcc/cp/ChangeLog

+2004-07-19  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/16623
+	* cp-tree.h (lang_type_class): Add lazy_assignment_op.
+	(CLASSTYPE_LAZY_ASSIGNMENT_OP): New macro.
+	* class.c (add_implicitly_declared_members): Use
+	CLASSTYPE_LAZY_ASSIGNMENT_OP.
+	* method.c (lazily_declare_fn): Clear
+	CLASSTYPE_LAZY_ASSIGNMENT_OP.
+	* search.c (lookup_fnfields_1): Check it.
+
 2004-07-20  Nathan Sidwell  <nathan@codesourcery.com>
 
 	* cp-tree.h (vec_binfo_member): Remove.

gcc/cp/class.c

@@ -2533,7 +2533,11 @@ add_implicitly_declared_members (tree t,
      of the parameter to the assignment operator will be a const or
      non-const reference.  */
   if (!TYPE_HAS_ASSIGN_REF (t) && !TYPE_FOR_JAVA (t))
-    TYPE_HAS_CONST_ASSIGN_REF (t) = !cant_have_const_assignment;
+    {
+      TYPE_HAS_ASSIGN_REF (t) = 1;
+      TYPE_HAS_CONST_ASSIGN_REF (t) = !cant_have_const_assignment;
+      CLASSTYPE_LAZY_ASSIGNMENT_OP (t) = 1;
+    }
   
   /* Now, hook all of the new functions on to TYPE_METHODS,
      and add them to the CLASSTYPE_METHOD_VEC.  */

gcc/cp/cp-tree.h

@@ -987,6 +987,7 @@ struct lang_type_class GTY(())
 
   unsigned lazy_default_ctor : 1;
   unsigned lazy_copy_ctor : 1;
+  unsigned lazy_assignment_op : 1;
   unsigned has_const_init_ref : 1;
   unsigned has_complex_init_ref : 1;
   unsigned has_complex_assign_ref : 1;
@@ -1000,7 +1001,7 @@ struct lang_type_class GTY(())
   /* There are some bits left to fill out a 32-bit word.  Keep track
      of this by updating the size of this bitfield whenever you add or
      remove a flag.  */
-  unsigned dummy : 9;
+  unsigned dummy : 8;
 
   tree primary_base;
   tree vcall_indices;
@@ -1094,6 +1095,11 @@ struct lang_type GTY(())
 #define CLASSTYPE_LAZY_COPY_CTOR(NODE) \
   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_copy_ctor)
 
+/* Nonzero means that NODE (a class type) has an assignment operator
+   -- but that it has not yet been declared.  */
+#define CLASSTYPE_LAZY_ASSIGNMENT_OP(NODE) \
+  (LANG_TYPE_CLASS_CHECK (NODE)->lazy_assignment_op)
+
 /* Nonzero means that this _CLASSTYPE node overloads operator=(X&).  */
 #define TYPE_HAS_ASSIGN_REF(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_assign_ref)
 

gcc/cp/method.c

@@ -1064,6 +1064,8 @@ lazily_declare_fn (special_function_kind sfk, tree type)
       /* Create appropriate clones.  */
       clone_function_decl (fn, /*update_method_vec=*/true);
     }
+  else if (sfk == sfk_assignment_operator)
+    CLASSTYPE_LAZY_ASSIGNMENT_OP (type) = 0;
 
   return fn;
 }

gcc/cp/search.c

@@ -1367,8 +1367,7 @@ lookup_fnfields_1 (tree type, tree name)
 	    lazily_declare_fn (sfk_copy_constructor, type);
 	}
       else if (name == ansi_assopname(NOP_EXPR)
-	       && !TYPE_HAS_ASSIGN_REF (type)
-	       && !TYPE_FOR_JAVA (type))
+	       && CLASSTYPE_LAZY_ASSIGNMENT_OP (type))
 	lazily_declare_fn (sfk_assignment_operator, type);
     }