Add *_alias rules to @bazel_tools so that people don't have to keep writing their own.

The alias_rules.bzl hack is required because Bazel at HEAD needs to be able to be built
with released Bazel, which doesn't know these rules yet.

RELNOTES: None.
PiperOrigin-RevId: 161808672

2 files changed, 34 insertions, 0 deletions

diff --git a/tools/jdk/BUILD b/tools/jdk/BUILD
index 12f4fed300..8ed90ef001 100644
--- a/tools/jdk/BUILD
+++ b/tools/jdk/BUILD
@@ -1,5 +1,13 @@
 package(default_visibility = ["//visibility:public"])
 
+# TODO(lberki): Remove this once java_toolchain_alias and java_runtime_alias are
+# in a Bazel release
+load("//tools/jdk:alias_rules.bzl", "java_runtime_alias", "java_toolchain_alias")
+
+java_runtime_alias(name = "current_java_runtime")
+
+java_toolchain_alias(name = "current_java_toolchain")
+
 config_setting(
     name = "jdk7",
     values = {"define": "JAVA_VERSION=1.7"},
@@ -173,6 +181,7 @@ filegroup(
     name = "srcs",
     srcs = [
         "BUILD-jdk",  # Tools are build from the workspace for tests.
+        "alias_rules.bzl",
         "proguard_whitelister.py",
         "proguard_whitelister_test.py",
         "proguard_whitelister_test_input.cfg",
diff --git a/tools/jdk/alias_rules.bzl b/tools/jdk/alias_rules.bzl
new file mode 100644
index 0000000000..71d1edb6c0
--- /dev/null
+++ b/tools/jdk/alias_rules.bzl
@@ -0,0 +1,25 @@
+# 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.
+
+def java_runtime_alias(name):
+  if hasattr(native, "java_runtime_alias"):
+    native.java_runtime_alias(name=name)
+  else:
+    pass
+
+def java_toolchain_alias(name):
+  if hasattr(native, "java_toolchain_alias"):
+    native.java_toolchain_alias(name=name)
+  else:
+    pass