1 files changed, 39 insertions, 0 deletions
diff --git a/absl/compiler_config_setting.bzl b/absl/compiler_config_setting.bzl
new file mode 100644
index 00000000..b77c4f56
--- /dev/null
+++ b/absl/compiler_config_setting.bzl
@@ -0,0 +1,39 @@
+#
+# Copyright 2018 The Abseil Authors.
+#
+# 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.
+#
+
+"""Creates config_setting that allows selecting based on 'compiler' value."""
+
+def create_llvm_config(name, visibility):
+  # The "do_not_use_tools_cpp_compiler_present" attribute exists to
+  # distinguish between older versions of Bazel that do not support
+  # "@bazel_tools//tools/cpp:compiler" flag_value, and newer ones that do.
+  # In the future, the only way to select on the compiler will be through
+  # flag_values{"@bazel_tools//tools/cpp:compiler"} and the else branch can
+  # be removed.
+  if hasattr(cc_common, "do_not_use_tools_cpp_compiler_present"):
+    native.config_setting(
+      name = name,
+      flag_values = {
+          "@bazel_tools//tools/cpp:compiler": "llvm",
+      },
+      visibility = visibility,
+    )
+  else:
+    native.config_setting(
+        name = name,
+        values = {"compiler": "llvm"},
+        visibility = visibility,
+    )