test-wrapper: add empty impl + Bazel flag

This commit adds:

- the skeleton implementation of the Windows
  native test wrapper

- a depenency on the native test wrapper from test
  rules, through the new $test_wrapper rule
  attribute

- the --windows_native_test_wrapper Bazel flag,
  which is currently a no-op

See https://github.com/bazelbuild/bazel/issues/5508

Change-Id: I8df95c8ce8bab53c51c257698ec95416065a836e

Closes #5854.

Change-Id: I2ffc78bceec5dd867af775b5878f105fa87c3dba
PiperOrigin-RevId: 208650699

1 files changed, 28 insertions, 0 deletions

diff --git a/tools/test/empty_test_wrapper.cc b/tools/test/empty_test_wrapper.cc
new file mode 100644
index 0000000000..006f29d93d
--- /dev/null
+++ b/tools/test/empty_test_wrapper.cc
@@ -0,0 +1,28 @@
+// Copyright 2018 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.
+
+// Empty implementation of the test wrapper.
+//
+// As of 2018-08-10, every platform uses //tools/test:test-setup.sh as the test
+// wrapper, and we are working on introducing a C++ test wrapper for Windows.
+// See
+// https://github.com/laszlocsomor/proposals/blob/win-test-runner/designs/2018-07-18-windows-native-test-runner.md
+
+#include <stdio.h>
+
+int main(int, char**) {
+  fprintf(stderr,
+          __FILE__ ": The C++ test wrapper is not used on this platform.\n");
+  return 1;
+}