mirror of https://github.com/bazelbuild/rules_cc
Revert "Add well-known compiler `config_setting`s"
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buildbreaker2021
GitHub
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# Copyright 2023 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Config settings for compilers identified by Bazel.
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Targets that require compiler-specific flags can use the config_settings defined
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in this package in their select() statements.
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*Note*: Before Bazel 6, gcc on Linux and clang on macOS would not match their
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specific config_setting, but only the fallback case of a select expression.
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Toolchains not shipped with Bazel are encouraged to use the same names to
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identify compilers as used below, but this is not enforced.
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Example:
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cc_binary(
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name = "foo",
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srcs = ["foo.cc"],
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copts = select({
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"@rules_cc//cc/compiler:gcc": [...],
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"@rules_cc//cc/compiler:clang": [...],
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"@rules_cc//cc/compiler:msvc-cl": [...],
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# Fallback case for an undetected compiler.
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"//conditions:default": [...],
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}),
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)
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If multiple targets use the same set of conditionally enabled flags, this can be
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simplified by extracting the select expression into a Starlark constant.
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"""
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package(default_visibility = ["//visibility:public"])
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licenses(["notice"]) # Apache 2.0
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config_setting(
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name = "clang",
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flag_values = {"@bazel_tools//tools/cpp:compiler": "clang"},
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)
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config_setting(
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name = "clang-cl",
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flag_values = {"@bazel_tools//tools/cpp:compiler": "clang-cl"},
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)
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config_setting(
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name = "gcc",
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flag_values = {"@bazel_tools//tools/cpp:compiler": "gcc"},
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)
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config_setting(
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name = "mingw-gcc",
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flag_values = {"@bazel_tools//tools/cpp:compiler": "mingw-gcc"},
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)
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config_setting(
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name = "msvc-cl",
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flag_values = {"@bazel_tools//tools/cpp:compiler": "msvc-cl"},
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)
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# Copyright 2023 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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load("//cc:defs.bzl", "cc_binary")
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licenses(["notice"])
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cc_binary(
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name = "main",
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srcs = ["main.cc"],
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local_defines = select(
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{
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"//cc/compiler:clang": ["COMPILER=clang"],
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"//cc/compiler:clang-cl": ["COMPILER=clang-cl"],
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"//cc/compiler:gcc": ["COMPILER=gcc"],
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"//cc/compiler:mingw-gcc": ["COMPILER=mingw-gcc"],
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"//cc/compiler:msvc-cl": ["COMPILER=msvc-cl"],
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},
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no_match_error = "Compiler not detected by Bazel",
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),
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)
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@ -1,22 +0,0 @@
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// Copyright 2023 The Bazel Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <iostream>
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#define STRINGIFY(x) #x
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#define TO_STRING(x) STRINGIFY(x)
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int main() {
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std::cout << "Hello, " << TO_STRING(COMPILER) << "!" << std::endl;
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}
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