Add a compiler_flag rule that exposes the value of the "compiler" field of CROSSTOOL
RELNOTES: None
PiperOrigin-RevId: 198295290
diff --git a/tools/cpp/compiler_flag.bzl b/tools/cpp/compiler_flag.bzl
new file mode 100644
index 0000000..4b134a1
--- /dev/null
+++ b/tools/cpp/compiler_flag.bzl
@@ -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.
+
+"""Rule that allows select() to differentiate between compilers."""
+
+load("//tools/cpp:toolchain_utils.bzl", "find_cpp_toolchain")
+
+def _compiler_flag_impl(ctx):
+ toolchain = find_cpp_toolchain(ctx)
+ return [config_common.FeatureFlagInfo(value = toolchain.compiler)]
+
+compiler_flag = rule(
+ implementation = _compiler_flag_impl,
+ attrs = {
+ "_cc_toolchain": attr.label(default=Label("//tools/cpp:current_cc_toolchain")),
+ }
+)
