# Copyright 2026 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 C standard libraries."""

load("//cc:find_cc_toolchain.bzl", "CC_TOOLCHAIN_ATTRS", "find_cpp_toolchain", "use_cc_toolchain")
load("//cc/toolchains/impl:libc_version.bzl", "libc_without_version")

def _libc_flag_impl(ctx):
    toolchain = find_cpp_toolchain(ctx)
    return [config_common.FeatureFlagInfo(value = libc_without_version(toolchain.libc))]

libc_flag = rule(
    implementation = _libc_flag_impl,
    attrs = CC_TOOLCHAIN_ATTRS,
    toolchains = use_cc_toolchain(),
)