pw_toolchain/host_clang/BUILD.bazel

# Copyright 2023 The Pigweed Authors
#
# 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
#
#     https://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(
    "@pw_toolchain//cc_toolchain:defs.bzl",
    "ALL_CPP_COMPILER_ACTIONS",
    "ALL_C_COMPILER_ACTIONS",
    "pw_cc_flag_set",
    "pw_cc_toolchain",
    "pw_cc_toolchain_feature",
)

package(default_visibility = ["//visibility:public"])

licenses(["notice"])

filegroup(name = "empty")

pw_cc_toolchain_feature(
    name = "macos_stdlib",
    cxx_builtin_include_directories = [
        "%package(@llvm_toolchain//)%/include/c++/v1",
        "%package(@llvm_toolchain//)%/lib/clang/17/include",
    ],
    linker_files = ["@llvm_toolchain//:lib/libc++.a"],
    target_compatible_with = ["@platforms//os:macos"],
)

pw_cc_toolchain_feature(
    name = "linux_sysroot",
    builtin_sysroot = "external/linux_sysroot",
    cxx_builtin_include_directories = [
        "%package(@llvm_toolchain//)%/include/x86_64-unknown-linux-gnu/c++/v1",
        "%package(@llvm_toolchain//)%/include/c++/v1",
        "%package(@llvm_toolchain//)%/lib/clang/17/include",
        "%sysroot%/usr/local/include",
        "%sysroot%/usr/include/x86_64-linux-gnu",
        "%sysroot%/usr/include",
    ],
    linkopts = [
        "-pthread",
        "-stdlib=libc++",
        "--rtlib=compiler-rt",
        "--unwindlib=libunwind",
    ],
)

# Although we use similar warnings for clang and arm_gcc, we don't have one
# centralized list, since we might want to use different warnings based on the
# compiler in the future.
pw_cc_flag_set(
    name = "warnings",
    actions = ALL_C_COMPILER_ACTIONS + ALL_CPP_COMPILER_ACTIONS,
    flags = [
        "-Wall",
        "-Wextra",
        # Make all warnings errors, except for the exemptions below.
        "-Werror",
        "-Wno-error=cpp",  # preprocessor #warning statement
        "-Wno-error=deprecated-declarations",  # [[deprecated]] attribute
    ],
)

pw_cc_flag_set(
    name = "no_unknown_warning_option",
    actions = ALL_C_COMPILER_ACTIONS + ALL_CPP_COMPILER_ACTIONS,
    flags = [
        "-Wno-unknown-warning-option",
    ],
)

filegroup(
    name = "all_linux_files",
    srcs = [
        "@linux_sysroot//:all",
        "@llvm_toolchain//:all",
    ],
)

pw_cc_toolchain(
    name = "host_toolchain_macos",
    abi_libc_version = "unknown",
    abi_version = "unknown",
    action_config_flag_sets = [
        ":warnings",
    ],
    all_files = "@llvm_toolchain//:all",
    ar = "@llvm_toolchain//:bin/llvm-ar",
    ar_files = "@llvm_toolchain//:all",
    as_files = "@llvm_toolchain//:all",
    compiler = "unknown",
    compiler_files = "@llvm_toolchain//:all",
    coverage_files = "@llvm_toolchain//:all",
    cpp = "@llvm_toolchain//:bin/clang++",
    dwp_files = "@llvm_toolchain//:all",
    feature_deps = [
        "@pw_toolchain//features:no_default_cpp_stdlib",
        ":macos_stdlib",
        "@pw_toolchain//features/macos:macos_sysroot",
        "@pw_toolchain//features:c++17",
        "@pw_toolchain//features:debugging",
        "@pw_toolchain//features:reduced_size",
        "@pw_toolchain//features:no_canonical_prefixes",
        "@pw_toolchain//features:no_rtti",
        "@pw_toolchain//features:wno_register",
        "@pw_toolchain//features:wnon_virtual_dtor",
    ],
    gcc = "@llvm_toolchain//:bin/clang",
    gcov = "@llvm_toolchain//:bin/llvm-cov",
    host_system_name = "unknown",
    ld = "@llvm_toolchain//:bin/clang++",
    linker_files = "@llvm_toolchain//:all",
    objcopy = "@llvm_toolchain//:bin/llvm-objcopy",
    objcopy_files = "@llvm_toolchain//:all",
    objdump = "@llvm_toolchain//:bin/llvm-objdump",
    strip = "@llvm_toolchain//:bin/llvm-strip",
    strip_files = "@llvm_toolchain//:all",
    supports_param_files = 0,
    # The implementations of some "legacy features" built into Bazel use
    # `target_libc` to determine if a toolchain targets MacOS,
    # https://github.com/bazelbuild/bazel/blob/release-7.0.0-pre.20230816.3rc1/src/main/java/com/google/devtools/build/lib/rules/cpp/CcModule.java#L1301-L1304
    target_cpu = "darwin",
    target_libc = "macosx",
    target_system_name = "unknown",
    toolchain_identifier = "host-toolchain-macos",
)

toolchain(
    name = "host_cc_toolchain_macos",
    exec_compatible_with = [
        "@platforms//os:macos",
    ],
    target_compatible_with = [
        "@platforms//os:macos",
    ],
    toolchain = ":host_toolchain_macos",
    toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
)

pw_cc_toolchain(
    name = "host_toolchain_linux",
    abi_libc_version = "unknown",
    abi_version = "unknown",
    action_config_flag_sets = [
        ":warnings",
    ],
    all_files = ":all_linux_files",
    ar = "@llvm_toolchain//:bin/llvm-ar",
    ar_files = ":all_linux_files",
    as_files = ":all_linux_files",
    compiler = "unknown",
    compiler_files = ":all_linux_files",
    coverage_files = ":all_linux_files",
    cpp = "@llvm_toolchain//:bin/clang++",
    dwp_files = ":all_linux_files",
    feature_deps = [
        ":linux_sysroot",
        "@pw_toolchain//features:c++17",
        "@pw_toolchain//features:debugging",
        "@pw_toolchain//features:reduced_size",
        "@pw_toolchain//features:no_canonical_prefixes",
        "@pw_toolchain//features:no_rtti",
        "@pw_toolchain//features:wno_register",
        "@pw_toolchain//features:wnon_virtual_dtor",
    ],
    gcc = "@llvm_toolchain//:bin/clang",
    gcov = "@llvm_toolchain//:bin/llvm-cov",
    host_system_name = "unknown",
    ld = "@llvm_toolchain//:bin/clang++",
    linker_files = ":all_linux_files",
    objcopy = "@llvm_toolchain//:bin/llvm-objcopy",
    objcopy_files = ":all_linux_files",
    objdump = "@llvm_toolchain//:bin/llvm-objdump",
    strip = "@llvm_toolchain//:bin/llvm-strip",
    strip_files = ":all_linux_files",
    supports_param_files = 0,
    target_cpu = "unknown",
    target_libc = "unknown",
    target_system_name = "unknown",
    toolchain_identifier = "host-toolchain-linux",
)

# A toolchain for Kythe. Identical to the regular Linux toolchain except for
# one extra feature, ":no_unknown_warning_option".
pw_cc_toolchain(
    name = "host_toolchain_linux_kythe",
    abi_libc_version = "unknown",
    abi_version = "unknown",
    action_config_flag_sets = [
        ":warnings",
        ":no_unknown_warning_option",
    ],
    all_files = ":all_linux_files",
    ar = "@llvm_toolchain//:bin/llvm-ar",
    ar_files = ":all_linux_files",
    as_files = ":all_linux_files",
    compiler = "unknown",
    compiler_files = ":all_linux_files",
    coverage_files = ":all_linux_files",
    cpp = "@llvm_toolchain//:bin/clang++",
    dwp_files = ":all_linux_files",
    feature_deps = [
        ":linux_sysroot",
        "@pw_toolchain//features:c++17",
        "@pw_toolchain//features:debugging",
        "@pw_toolchain//features:reduced_size",
        "@pw_toolchain//features:no_canonical_prefixes",
        "@pw_toolchain//features:no_rtti",
        "@pw_toolchain//features:wno_register",
        "@pw_toolchain//features:wnon_virtual_dtor",
    ],
    gcc = "@llvm_toolchain//:bin/clang",
    gcov = "@llvm_toolchain//:bin/llvm-cov",
    host_system_name = "unknown",
    ld = "@llvm_toolchain//:bin/clang++",
    linker_files = ":all_linux_files",
    objcopy = "@llvm_toolchain//:bin/llvm-objcopy",
    objcopy_files = ":all_linux_files",
    objdump = "@llvm_toolchain//:bin/llvm-objdump",
    strip = "@llvm_toolchain//:bin/llvm-strip",
    strip_files = ":all_linux_files",
    supports_param_files = 0,
    target_cpu = "unknown",
    target_libc = "unknown",
    target_system_name = "unknown",
    toolchain_identifier = "host-toolchain-linux",
)

toolchain(
    name = "host_cc_toolchain_linux",
    exec_compatible_with = [
        "@platforms//os:linux",
    ],
    target_compatible_with = [
        "@platforms//os:linux",
    ],
    toolchain = ":host_toolchain_linux",
    toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
)

toolchain(
    name = "host_cc_toolchain_linux_kythe",
    exec_compatible_with = [
        "@platforms//os:linux",
    ],
    target_compatible_with = [
        "@platforms//os:linux",
    ],
    # This toolchain will only be selected in toolchain resolution if this
    # config_setting is active.
    target_settings = ["//pw_build:kythe"],
    toolchain = ":host_toolchain_linux_kythe",
    toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
)