re PR c++/54501 (infinite recursion on illegal code)

/cp
2012-10-18  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/54501
	* decl.c (reshape_init_array_1): Avoid infinite loops.

/testsuite
2012-10-18  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/54501
	* g++.dg/init/array30.C: New.
	* g++.dg/init/array31.C: Likewise.

From-SVN: r192592

gcc/cp/ChangeLog

+2012-10-18  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/54501
+	* decl.c (reshape_init_array_1): Avoid infinite loops.
+
 2012-10-15  Alexandre Oliva  <aoliva@redhat.com>
 	    Paolo Carlini  <paolo.carlini@oracle.com>
 

gcc/cp/decl.c

@@ -5040,6 +5040,7 @@ reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
        ++index)
     {
       tree elt_init;
+      constructor_elt *old_cur = d->cur;
 
       check_array_designated_initializer (d->cur, index);
       elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
@@ -5050,6 +5051,10 @@ reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
 			      size_int (index), elt_init);
       if (!TREE_CONSTANT (elt_init))
 	TREE_CONSTANT (new_init) = false;
+
+      /* This can happen with an invalid initializer (c++/54501).  */
+      if (d->cur == old_cur && !sized_array_p)
+	break;
     }
 
   return new_init;

gcc/testsuite/ChangeLog

+2012-10-18  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/54501
+	* g++.dg/init/array30.C: New.
+	* g++.dg/init/array31.C: Likewise.
+
 2012-10-18  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/54884

gcc/testsuite/g++.dg/init/array30.C

+// PR c++/54501
+// { dg-options "" }
+
+int main()
+{
+  int a[][0] = {0};  // { dg-error "too many" }
+}

gcc/testsuite/g++.dg/init/array31.C

+// PR c++/54501
+// { dg-options "" }
+
+struct A
+{
+  int i[0];
+  int j;
+};
+
+struct A a = { 1 };