Replace dummy.c with dummy.m to allow preprocessing of objc source code to import objc frameworks.

--
MOS_MIGRATED_REVID=114761121

2 files changed, 28 insertions, 1 deletions

diff --git a/tools/objc/BUILD b/tools/objc/BUILD
index 4b6b56c417..3b7f489e9f 100644
--- a/tools/objc/BUILD
+++ b/tools/objc/BUILD
@@ -122,5 +122,7 @@ py_library(
 
 objc_library(
     name = "dummy_lib",
-    srcs = ["dummy.c"],
+    srcs = [
+        "objc_dummy.m",
+    ],
 )
diff --git a/tools/objc/objc_dummy.m b/tools/objc/objc_dummy.m
new file mode 100644
index 0000000000..6a2128333f
--- /dev/null
+++ b/tools/objc/objc_dummy.m
@@ -0,0 +1,25 @@
+// Copyright 2015 The Bazel Authors. 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.
+
+/*
+ * Include this file in a target if it requires some source but you don't have
+ * any.
+ *
+ * ios_extension_binary rules only generate a static library Xcode target, and
+ * the ios_extension will generate an actual bundling Xcode target. Application
+ * and app extension targets need at least one source file for Xcode to be
+ * happy, so we can add this file for them.
+ */
+
+static int dummy __attribute__((unused,used)) = 0;