re PR sanitizer/81209 (-fsanitize=undefined ICE on darwin)

	PR sanitizer/81209
	* ubsan.c (ubsan_encode_value): Initialize DECL_CONTEXT on var.

	* g++.dg/ubsan/pr81209.C: New test.

From-SVN: r249678

gcc/ChangeLog

 2017-06-27  Jakub Jelinek  <jakub@redhat.com>
 
+	PR sanitizer/81209
+	* ubsan.c (ubsan_encode_value): Initialize DECL_CONTEXT on var.
+
 	PR middle-end/81207
 	* gimple-fold.c (replace_call_with_call_and_fold): Handle
 	gimple_vuse copying separately from gimple_vdef copying.

gcc/testsuite/ChangeLog

 2017-06-27  Jakub Jelinek  <jakub@redhat.com>
 
+	PR sanitizer/81209
+	* g++.dg/ubsan/pr81209.C: New test.
+
 	PR middle-end/81207
 	* gcc.c-torture/compile/pr81207.c: New test.
 

gcc/testsuite/g++.dg/ubsan/pr81209.C

+// PR sanitizer/81209
+// { dg-do compile }
+// { dg-options "-fsanitize=undefined -fno-declone-ctor-dtor" }
+
+#ifdef __SIZEOF_INT128__
+typedef __int128 T;
+#else
+typedef long long int T;
+#endif
+
+struct B {};
+struct A : virtual public B
+{
+  A (long);
+  T a;
+};
+
+A::A (long c)
+{
+  long b = a % c;
+}

gcc/ubsan.c

@@ -153,6 +153,7 @@ ubsan_encode_value (tree t, enum ubsan_encode_value_phase phase)
 	    {
 	      var = create_tmp_var_raw (type);
 	      TREE_ADDRESSABLE (var) = 1;
+	      DECL_CONTEXT (var) = current_function_decl;
 	    }
 	  if (phase == UBSAN_ENCODE_VALUE_RTL)
 	    {