re PR c++/55032 (Internal compiler error: in strip_typedefs, at cp/tree.c:1199)

	PR c++/55032
	* tree.c (build_array_type_1): Re-layout if we found it in the
	hash table.

From-SVN: r194265

gcc/ChangeLog

+2012-12-06  Jason Merrill  <jason@redhat.com>
+
+	PR c++/55032
+	* tree.c (build_array_type_1): Re-layout if we found it in the
+	hash table.
+
 2012-12-06  Jack Howarth <howarth@bromo.med.uc.edu>
 
 	PR 55599/sanitizer

gcc/testsuite/g++.dg/template/array24.C

+// PR c++/55032
+
+template<typename T>
+struct vec3t {
+  T c[3];
+};
+
+typedef vec3t<float> vec3;
+
+class Bounds {
+  public:
+    Bounds(const vec3 bb[2]);
+    void foo(const vec3 & v) { v.c[0]; }
+};
+
+template<typename T>
+void work(T& value);
+
+void foo() {
+  vec3 bb[2];
+  work(bb);
+}

gcc/tree.c

@@ -7505,7 +7505,12 @@ build_array_type_1 (tree elt_type, tree index_type, bool shared)
       hashval_t hashcode = iterative_hash_object (TYPE_HASH (elt_type), 0);
       if (index_type)
 	hashcode = iterative_hash_object (TYPE_HASH (index_type), hashcode);
+      tree old_t = t;
       t = type_hash_canon (hashcode, t);
+      if (t != old_t)
+	/* Lay it out again in case the element type has been completed since
+	   the array was added to the hash table.  */
+	layout_type (t);
     }
 
   if (TYPE_CANONICAL (t) == t)