PR c++/88394 - ICE with VLA init-capture.

We mostly use is_normal_capture_proxy to decide whether or not to use
DECL_CAPTURED_VARIABLE; we could just check whether it's set.  VLA capture
is still mostly broken, but this fixes this ICE.

	* lambda.c (is_normal_capture_proxy): Check DECL_CAPTURED_VARIABLE.

From-SVN: r269094

gcc/cp/ChangeLog

 2019-02-21  Jason Merrill  <jason@redhat.com>
 
+	PR c++/88394 - ICE with VLA init-capture.
+	* lambda.c (is_normal_capture_proxy): Check DECL_CAPTURED_VARIABLE.
+
 	PR c++/88869 - C++17 ICE with CTAD and explicit specialization.
 	* pt.c (do_class_deduction): Don't include explicit specialization
 	args in outer_args.

gcc/cp/lambda.c

@@ -279,20 +279,8 @@ is_normal_capture_proxy (tree decl)
     /* It's not a capture proxy.  */
     return false;
 
-  if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
-    /* VLA capture.  */
-    return true;
-
-  /* It is a capture proxy, is it a normal capture?  */
-  tree val = DECL_VALUE_EXPR (decl);
-  if (val == error_mark_node)
-    return true;
-
-  if (TREE_CODE (val) == ADDR_EXPR)
-    val = TREE_OPERAND (val, 0);
-  gcc_assert (TREE_CODE (val) == COMPONENT_REF);
-  val = TREE_OPERAND (val, 1);
-  return DECL_NORMAL_CAPTURE_P (val);
+  return (DECL_LANG_SPECIFIC (decl)
+	  && DECL_CAPTURED_VARIABLE (decl));
 }
 
 /* Returns true iff DECL is a capture proxy for a normal capture

gcc/testsuite/g++.dg/cpp1y/lambda-init-vla1.C

+// PR c++/88394
+// { dg-do compile { target c++14 } }
+// { dg-options "" }
+
+void crash_me(unsigned short sz)
+{
+  if (sz == 0) return;
+
+  short iov[sz];
+  auto fce = [&iv = iov](short value) { iv[0] = 0; };
+  fce(1);
+}