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Revert "Add well-known compiler `config_setting`s"

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buildbreaker2021 2023-07-18 10:09:37 +02:00 committed by GitHub
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71
cc/compiler/BUILD
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@ -1,71 +0,0 @@
# 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"},
)

32
tests/compiler_settings/BUILD
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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.
load("//cc:defs.bzl", "cc_binary")
licenses(["notice"])
cc_binary(
name = "main",
srcs = ["main.cc"],
local_defines = select(
{
"//cc/compiler:clang": ["COMPILER=clang"],
"//cc/compiler:clang-cl": ["COMPILER=clang-cl"],
"//cc/compiler:gcc": ["COMPILER=gcc"],
"//cc/compiler:mingw-gcc": ["COMPILER=mingw-gcc"],
"//cc/compiler:msvc-cl": ["COMPILER=msvc-cl"],
},
no_match_error = "Compiler not detected by Bazel",
),
)

22
tests/compiler_settings/main.cc
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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.
#include <iostream>
#define STRINGIFY(x) #x
#define TO_STRING(x) STRINGIFY(x)
int main() {
std::cout << "Hello, " << TO_STRING(COMPILER) << "!" << std::endl;
}