Make bazel test src/tools/launcher/... pass on Unix platform

Since src/tools/launcher is Windows specific, it doesn't actually work
on Linux. Here we select a dummy source file for cc targets non-Windows
platform.

Change-Id: I9a6550ea23a3656ad72cb46b9652f154e2fbf44f
PiperOrigin-RevId: 176350180

src/tools/launcher/BUILD

@@ -1,3 +1,5 @@
+load(":win_rules.bzl", "cc_binary", "cc_library")
+
 filegroup(
     name = "srcs",
     srcs = glob(["**"]) + ["//src/tools/launcher/util:srcs"],

src/tools/launcher/dummy.cc

@@ -0,0 +1,15 @@
+// Copyright 2017 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.
+
+int main() {}

src/tools/launcher/util/BUILD

@@ -1,5 +1,7 @@
 package(default_visibility = ["//src/tools/launcher:__subpackages__"])
 
+load("//src/tools/launcher:win_rules.bzl", "cc_library", "cc_binary", "cc_test")
+
 filegroup(
     name = "srcs",
     srcs = glob(["**"]),

src/tools/launcher/util/dummy.cc

@@ -0,0 +1,15 @@
+// Copyright 2017 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.
+
+int main() {}

src/tools/launcher/win_rules.bzl

@@ -0,0 +1,47 @@
+# Copyright 2017 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.
+
+# This is a quick and dirty rule to make Bazel compile itself.  It
+# only supports Java.
+
+def cc_library(srcs=[], hdrs=[], **kwargs):
+  """Replace srcs and hdrs with a dummy.cc on non-Windows platforms."""
+  native.cc_library(
+      srcs = select({
+            "//conditions:default": ["dummy.cc"],
+            "//src:windows": srcs,
+          }),
+      hdrs = select({
+            "//conditions:default": [],
+            "//src:windows": hdrs,
+          }),
+      **kwargs)
+
+def cc_binary(srcs=[], **kwargs):
+  """Replace srcs with a dummy.cc on non-Windows platforms."""
+  native.cc_binary(
+      srcs = select({
+            "//conditions:default": ["dummy.cc"],
+            "//src:windows": srcs,
+          }),
+      **kwargs)
+
+def cc_test(srcs=[], **kwargs):
+  """Replace srcs with a dummy.cc on non-Windows platforms."""
+  native.cc_test(
+      srcs = select({
+            "//conditions:default": ["dummy.cc"],
+            "//src:windows": srcs,
+          }),
+      **kwargs)