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+# Copyright 2023 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.
+
+"""Config settings for compilers identified by Bazel.
+
+Targets that require compiler-specific flags can use the config_settings defined
+in this package in their select() statements.
+
+*Note*: Before Bazel 6, gcc on Linux and clang on macOS would not match their
+specific config_setting, but only the fallback case of a select expression.
+
+Toolchains not shipped with Bazel are encouraged to use the same names to
+identify compilers as used below, but this is not enforced.
+
+Example:
+
+ cc_binary(
+ name = "foo",
+ srcs = ["foo.cc"],
+ copts = select({
+ "@rules_cc//cc/compiler:gcc": [...],
+ "@rules_cc//cc/compiler:clang": [...],
+ "@rules_cc//cc/compiler:msvc-cl": [...],
+ # Fallback case for an undetected compiler.
+ "//conditions:default": [...],
+ }),
+ )
+
+If multiple targets use the same set of conditionally enabled flags, this can be
+simplified by extracting the select expression into a Starlark constant.
+"""
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"]) # Apache 2.0
+
+config_setting(
+ name = "clang",
+ flag_values = {"@bazel_tools//tools/cpp:compiler": "clang"},
+)
+
+config_setting(
+ name = "clang-cl",
+ flag_values = {"@bazel_tools//tools/cpp:compiler": "clang-cl"},
+)
+
+config_setting(
+ name = "gcc",
+ flag_values = {"@bazel_tools//tools/cpp:compiler": "gcc"},
+)
+
+config_setting(
+ name = "mingw-gcc",
+ flag_values = {"@bazel_tools//tools/cpp:compiler": "mingw-gcc"},
+)
+
+config_setting(
+ name = "msvc-cl",
+ flag_values = {"@bazel_tools//tools/cpp:compiler": "msvc-cl"},
+)