PR c++/84560 - ICE capturing multi-dimensional VLA.

	* tree.c (array_of_runtime_bound_p): False if the element is
	variably-modified.

From-SVN: r258023

gcc/cp/ChangeLog

 2018-02-26  Jason Merrill  <jason@redhat.com>
 
+	PR c++/84560 - ICE capturing multi-dimensional VLA.
+	* tree.c (array_of_runtime_bound_p): False if the element is
+	variably-modified.
+
 	PR c++/84441 - ICE with base initialized from ?:
 	* call.c (unsafe_copy_elision_p): Handle COND_EXPR.
 

gcc/cp/tree.c

@@ -1043,6 +1043,8 @@ array_of_runtime_bound_p (tree t)
 {
   if (!t || TREE_CODE (t) != ARRAY_TYPE)
     return false;
+  if (variably_modified_type_p (TREE_TYPE (t), NULL_TREE))
+    return false;
   tree dom = TYPE_DOMAIN (t);
   if (!dom)
     return false;

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-vla2.C

+// PR c++/84560
+// { dg-do compile { target c++11 } }
+// { dg-options "" }
+
+void f() {
+  int n = 1;
+  int m = 1;
+  int d[n][m];
+  [&]() {
+    return d[1];		// { dg-error "variabl" }
+  }();
+}