Block CFI on static libraries

Bug: 295805467
Test: Unit tests and inspecting generated BUILD files
Change-Id: I1bbd2f48ad384e0b5b6f7cc1458b12ded2748e8f
diff --git a/cc/constants.go b/cc/constants.go
new file mode 100644
index 0000000..f188d4e
--- /dev/null
+++ b/cc/constants.go
@@ -0,0 +1,19 @@
+// Copyright 2016 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cc
+
+var (
+	cfiFeatureName = "android_cfi"
+)