re PR c++/54026 (template const struct with mutable members erroneously emitted to .rodata)

	PR c++/54026
	* typeck.c (cp_apply_type_quals_to_decl): Check COMPLETE_TYPE_P.

From-SVN: r189701

gcc/cp/ChangeLog

 2012-07-19  Jason Merrill  <jason@redhat.com>
 
+	PR c++/54026
+	* typeck.c (cp_apply_type_quals_to_decl): Check COMPLETE_TYPE_P.
+
 	PR c++/54021
 	* call.c (build_cxx_call): Set optimize when folding
 	__builtin_constant_p in a constexpr function.

gcc/cp/typeck.c

@@ -8453,9 +8453,9 @@ cp_apply_type_quals_to_decl (int type_quals, tree decl)
      constructor can produce constant init, so rely on cp_finish_decl to
      clear TREE_READONLY if the variable has non-constant init.  */
 
-  /* If the type has a mutable component, that component might be
-     modified.  */
-  if (TYPE_HAS_MUTABLE_P (type))
+  /* If the type has (or might have) a mutable component, that component
+     might be modified.  */
+  if (TYPE_HAS_MUTABLE_P (type) || !COMPLETE_TYPE_P (type))
     type_quals &= ~TYPE_QUAL_CONST;
 
   c_apply_type_quals_to_decl (type_quals, decl);

gcc/testsuite/ChangeLog

+2012-07-19  Jason Merrill  <jason@redhat.com>
+
+	PR c++/54026
+	* g++.dg/init/mutable1.C: New.
+
 2012-07-20  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/48820

gcc/testsuite/g++.dg/init/mutable1.C

+// PR c++/54026
+// { dg-final { scan-assembler-not "rodata" } }
+
+void non_const(int *);
+
+template <typename T>
+struct Foo {
+  T x;
+  mutable int y;
+  void func() const { non_const(&y); }
+};
+
+struct Bar {
+  int x;
+  mutable int y;
+  void func() const { non_const(&y); }
+};
+
+const Foo<int> foo = { 1, 2 };
+const Bar bar = { 3, 4 };