| # Copyright 2022 The Fuchsia Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| """ |
| Clang toolchain configuration. |
| """ |
| |
| load( |
| "@bazel_tools//tools/cpp:cc_toolchain_config_lib.bzl", |
| "feature", |
| "flag_group", |
| "flag_set", |
| "tool_path", |
| "with_feature_set", |
| ) |
| load( |
| "@bazel_tools//tools/cpp:toolchain_utils.bzl", |
| "find_cpp_toolchain", |
| "use_cpp_toolchain", |
| ) |
| load("@bazel_tools//tools/build_defs/cc:action_names.bzl", "ACTION_NAMES") |
| load("@%{SDK_ROOT}//:api_version.bzl", "DEFAULT_CLANG_TARGET_API") |
| |
| def _sanitizer_feature(name, fsanitize): |
| return feature( |
| name = name, |
| flag_sets = [ |
| flag_set( |
| actions = [ |
| ACTION_NAMES.c_compile, |
| ACTION_NAMES.cpp_compile, |
| ACTION_NAMES.cpp_module_compile, |
| ACTION_NAMES.cpp_link_executable, |
| ACTION_NAMES.cpp_link_dynamic_library, |
| ACTION_NAMES.cpp_link_nodeps_dynamic_library, |
| ], |
| flag_groups = [flag_group(flags = ["-fsanitize=" + fsanitize])], |
| ), |
| ], |
| implies = ["sanitizer"], |
| ) |
| |
| def _cc_toolchain_config_impl(ctx): |
| target_system_name = ctx.attr.cpu + "-fuchsia" |
| tool_paths = [ |
| tool_path( |
| name = "ar", |
| path = "bin/llvm-ar", |
| ), |
| tool_path( |
| name = "cpp", |
| path = "bin/clang++", |
| ), |
| tool_path( |
| name = "gcc", |
| path = "bin/clang", |
| ), |
| tool_path( |
| name = "lld", |
| path = "bin/lld", |
| ), |
| tool_path( |
| name = "objdump", |
| path = "bin/llvm-objdump", |
| ), |
| tool_path( |
| name = ACTION_NAMES.strip, |
| path = "bin/llvm-strip", |
| ), |
| tool_path( |
| name = "nm", |
| path = "bin/llvm-nm", |
| ), |
| tool_path( |
| name = "objcopy", |
| path = "bin/llvm-objcopy", |
| ), |
| tool_path( |
| name = "dwp", |
| path = "/not_available/dwp", |
| ), |
| tool_path( |
| name = "compat-ld", |
| path = "/not_available/compat-ld", |
| ), |
| tool_path( |
| name = "gcov", |
| path = "/not_available/gcov", |
| ), |
| tool_path( |
| name = "gcov-tool", |
| path = "/not_available/gcov-tool", |
| ), |
| tool_path( |
| name = "ld", |
| path = "bin/ld.lld", |
| ), |
| ] |
| features = [ |
| # Redefine the dependency_file feature to use -MMD instead of -MD |
| # to make remote builds work properly. |
| feature( |
| name = "dependency_file", |
| enabled = True, |
| flag_sets = [ |
| flag_set( |
| actions = [ |
| ACTION_NAMES.assemble, |
| ACTION_NAMES.preprocess_assemble, |
| ACTION_NAMES.c_compile, |
| ACTION_NAMES.cpp_compile, |
| ACTION_NAMES.cpp_module_compile, |
| ACTION_NAMES.objc_compile, |
| ACTION_NAMES.objcpp_compile, |
| ACTION_NAMES.cpp_header_parsing, |
| ACTION_NAMES.clif_match, |
| ], |
| flag_groups = [ |
| flag_group( |
| flags = ["-MMD", "-MF", "%{dependency_file}"], |
| expand_if_available = "dependency_file", |
| ), |
| ], |
| ), |
| ], |
| ), |
| feature( |
| name = "default_compile_flags", |
| flag_sets = [ |
| flag_set( |
| actions = [ |
| ACTION_NAMES.assemble, |
| ACTION_NAMES.preprocess_assemble, |
| ACTION_NAMES.linkstamp_compile, |
| ACTION_NAMES.c_compile, |
| ACTION_NAMES.cpp_compile, |
| ACTION_NAMES.cpp_header_parsing, |
| ACTION_NAMES.cpp_module_compile, |
| ACTION_NAMES.cpp_module_codegen, |
| ACTION_NAMES.lto_backend, |
| ACTION_NAMES.clif_match, |
| ], |
| flag_groups = [ |
| flag_group( |
| flags = [ |
| "--target=" + target_system_name, |
| "-Wall", |
| "-Werror", |
| "-Wextra-semi", |
| "-Wnewline-eof", |
| "-fdiagnostics-color", |
| "-ffuchsia-api-level=" + str(DEFAULT_CLANG_TARGET_API), |
| # TODO(mangini): llcpp is causing shadow errors, see why and reenable: "-Wshadow", |
| ], |
| ), |
| ], |
| ), |
| flag_set( |
| actions = [ |
| ACTION_NAMES.linkstamp_compile, |
| ACTION_NAMES.cpp_compile, |
| ACTION_NAMES.cpp_header_parsing, |
| ACTION_NAMES.cpp_module_compile, |
| ACTION_NAMES.cpp_module_codegen, |
| ACTION_NAMES.lto_backend, |
| ACTION_NAMES.clif_match, |
| ], |
| flag_groups = [ |
| flag_group( |
| flags = [ |
| "-std=c++17", |
| "-xc++", |
| # Needed to compile shared libraries. |
| "-fPIC", |
| ], |
| ), |
| ], |
| ), |
| ], |
| enabled = True, |
| ), |
| feature( |
| name = "default_link_flags", |
| flag_sets = [ |
| flag_set( |
| actions = [ |
| ACTION_NAMES.cpp_link_executable, |
| ACTION_NAMES.cpp_link_dynamic_library, |
| ACTION_NAMES.cpp_link_nodeps_dynamic_library, |
| ], |
| flag_groups = [ |
| flag_group( |
| flags = [ |
| "--target=" + target_system_name, |
| "--driver-mode=g++", |
| "-lzircon", |
| ], |
| ), |
| ], |
| ), |
| ], |
| enabled = True, |
| ), |
| feature( |
| name = "supports_pic", |
| enabled = True, |
| ), |
| feature( |
| name = "coverage", |
| flag_sets = [ |
| flag_set( |
| actions = [ |
| ACTION_NAMES.c_compile, |
| ACTION_NAMES.cpp_compile, |
| ACTION_NAMES.cpp_link_dynamic_library, |
| ACTION_NAMES.cpp_link_executable, |
| ACTION_NAMES.cpp_link_nodeps_dynamic_library, |
| ], |
| flag_groups = [ |
| flag_group( |
| flags = [ |
| "-fprofile-instr-generate", |
| "-fcoverage-mapping", |
| ], |
| ), |
| ], |
| ), |
| flag_set( |
| actions = [ |
| ACTION_NAMES.c_compile, |
| ACTION_NAMES.cpp_compile, |
| ACTION_NAMES.cpp_module_compile, |
| ], |
| flag_groups = [ |
| flag_group( |
| flags = [ |
| "-O1", |
| ], |
| ), |
| ], |
| ), |
| flag_set( |
| actions = [ |
| ACTION_NAMES.cpp_link_dynamic_library, |
| ACTION_NAMES.cpp_link_executable, |
| ACTION_NAMES.cpp_link_nodeps_dynamic_library, |
| ], |
| flag_groups = [ |
| flag_group( |
| flags = [ |
| # The statically-linked profiling runtime depends on libzircon. |
| "-lzircon", |
| ], |
| ), |
| ], |
| ), |
| ], |
| ), |
| feature( |
| name = "ml_inliner", |
| flag_sets = [ |
| flag_set( |
| actions = [ |
| ACTION_NAMES.c_compile, |
| ACTION_NAMES.cpp_compile, |
| ACTION_NAMES.cpp_module_compile, |
| ], |
| flag_groups = [ |
| flag_group( |
| flags = [ |
| "-mllvm", |
| "-enable-ml-inliner=release", |
| ], |
| ), |
| ], |
| with_features = [with_feature_set( |
| features = ["opt"], |
| )], |
| ), |
| ], |
| ), |
| feature( |
| name = "sanitizer", |
| flag_sets = [ |
| flag_set( |
| actions = [ |
| ACTION_NAMES.c_compile, |
| ACTION_NAMES.cpp_compile, |
| ACTION_NAMES.cpp_module_compile, |
| ], |
| flag_groups = [ |
| flag_group( |
| flags = [ |
| "-fno-omit-frame-pointer", |
| "-g3", |
| "-O1", |
| ], |
| ), |
| ], |
| ), |
| ], |
| ), |
| _sanitizer_feature("asan", "address"), |
| _sanitizer_feature("lsan", "leak"), |
| _sanitizer_feature("msan", "memory"), |
| _sanitizer_feature("tsan", "thread"), |
| _sanitizer_feature("ubsan", "undefined"), |
| ] |
| return cc_common.create_cc_toolchain_config_info( |
| ctx = ctx, |
| toolchain_identifier = "crosstool-1.x.x-llvm-fuchsia-" + ctx.attr.cpu, |
| host_system_name = "x86_64-unknown-linux-gnu", |
| target_system_name = target_system_name, |
| target_cpu = ctx.attr.cpu, |
| target_libc = "fuchsia", |
| compiler = "llvm", |
| abi_version = "local", |
| abi_libc_version = "local", |
| tool_paths = tool_paths, |
| # Implicit dependencies for Fuchsia system functionality |
| cxx_builtin_include_directories = [ |
| "%sysroot%/include", # Platform parts of libc. |
| "%{CROSSTOOL_ROOT}/include/" + ctx.attr.cpu + "-unknown-fuchsia/c++/v1", # Platform libc++. |
| "%{CROSSTOOL_ROOT}/include/c++/v1", # Platform libc++. |
| "%{CROSSTOOL_ROOT}/lib/clang/%{CLANG_VERSION}/include", # Platform libc++. |
| "%{CROSSTOOL_ROOT}/lib/clang/%{CLANG_VERSION}/share", # Platform libc++. |
| ], |
| builtin_sysroot = "%{SYSROOT_PATH_PREFIX}" + ctx.attr.cpu, |
| features = features, |
| cc_target_os = "fuchsia", |
| ) |
| |
| cc_toolchain_config = rule( |
| implementation = _cc_toolchain_config_impl, |
| attrs = { |
| "cpu": attr.string(mandatory = True, values = ["aarch64", "x86_64"]), |
| }, |
| provides = [CcToolchainConfigInfo], |
| ) |
| |
| def _feature_flag(ctx): |
| toolchain = find_cpp_toolchain(ctx) |
| feature = ctx.attr.feature_name |
| feature_configuration = cc_common.configure_features( |
| ctx = ctx, |
| cc_toolchain = toolchain, |
| requested_features = ctx.features, |
| unsupported_features = ctx.disabled_features, |
| ) |
| return [config_common.FeatureFlagInfo(value = str(cc_common.is_enabled( |
| feature_configuration = feature_configuration, |
| feature_name = feature, |
| )))] |
| |
| # A flag whose value corresponds to whether a toolchain feature is enabled. |
| # For instance if `feature_name = "asan"` and you passed `--features=asan` |
| # then the value will be True. |
| feature_flag = rule( |
| implementation = _feature_flag, |
| attrs = { |
| "feature_name": attr.string(), |
| "_cc_toolchain": attr.label(default = Label("@bazel_tools//tools/cpp:current_cc_toolchain")), |
| }, |
| fragments = ["cpp"], |
| toolchains = use_cpp_toolchain(), |
| ) |
