|  | # 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("//cc:find_cc_toolchain.bzl", "CC_TOOLCHAIN_ATTRS", "find_cpp_toolchain", "use_cc_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_ATTRS, | 
|  | toolchains = use_cc_toolchain(), | 
|  | ) |