xref: /aosp_15_r20/external/bazelbuild-rules_cc/cc/compiler/BUILD (revision eed53cd41c5909d05eedc7ad9720bb158fd93452) 
1# Copyright 2023 The Bazel Authors. All rights reserved.
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#    http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15"""Config settings for compilers identified by Bazel.
16
17Targets that require compiler-specific flags can use the config_settings defined
18in this package in their select() statements.
19
20*Note*: Before Bazel 6, gcc on Linux and clang on macOS would not match their
21specific config_setting, but only the fallback case of a select expression.
22
23Toolchains not shipped with Bazel are encouraged to use the same names to
24identify compilers as used below, but this is not enforced.
25
26Example:
27
28  cc_binary(
29    name = "foo",
30    srcs = ["foo.cc"],
31    copts = select({
32        "@rules_cc//cc/compiler:gcc": [...],
33        "@rules_cc//cc/compiler:clang": [...],
34        "@rules_cc//cc/compiler:msvc-cl": [...],
35        # Fallback case for an undetected compiler.
36        "//conditions:default": [...],
37    }),
38  )
39
40If multiple targets use the same set of conditionally enabled flags, this can be
41simplified by extracting the select expression into a Starlark constant.
42"""
43
44package(default_visibility = ["//visibility:public"])
45
46licenses(["notice"])
47
48config_setting(
49    name = "clang",
50    flag_values = {"@bazel_tools//tools/cpp:compiler": "clang"},
51)
52
53config_setting(
54    name = "clang-cl",
55    flag_values = {"@bazel_tools//tools/cpp:compiler": "clang-cl"},
56)
57
58config_setting(
59    name = "gcc",
60    flag_values = {"@bazel_tools//tools/cpp:compiler": "gcc"},
61)
62
63config_setting(
64    name = "mingw-gcc",
65    flag_values = {"@bazel_tools//tools/cpp:compiler": "mingw-gcc"},
66)
67
68config_setting(
69    name = "msvc-cl",
70    flag_values = {"@bazel_tools//tools/cpp:compiler": "msvc-cl"},
71)
72