mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-05 22:02:55 +01:00
Chandler CarruthandRichard Smith
8bee5ebe83
C++20 mode exposes bugs in `clang-tidy` 16 that are challenging to work around, but this should manage to do so. The patch to `bazel_clang_tidy` has been sent upstream but no need to wait for it. We don't actually specify a specific version of C++ in our style guide docs, and the Google style guide has already been updated to be based on C++20 so nothing to be done there. --------- Co-authored-by: Richard Smith <richard@metafoo.co.uk>
1128 lines
44 KiB
Python
1128 lines
44 KiB
Python
# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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# Exceptions. See /LICENSE for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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"""A Starlark cc_toolchain configuration rule"""
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load("@bazel_tools//tools/build_defs/cc:action_names.bzl", "ACTION_NAMES")
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load(
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"@bazel_tools//tools/cpp:cc_toolchain_config_lib.bzl",
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"action_config",
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"feature",
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"feature_set",
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"flag_group",
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"flag_set",
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"tool",
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"tool_path",
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"variable_with_value",
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"with_feature_set",
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)
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load("@rules_cc//cc:defs.bzl", "cc_toolchain")
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load(
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":clang_detected_variables.bzl",
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"clang_bindir",
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"clang_include_dirs_list",
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"clang_resource_dir",
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"clang_version",
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"clang_version_for_cache",
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"llvm_bindir",
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"sysroot_dir",
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)
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all_c_compile_actions = [
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ACTION_NAMES.c_compile,
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ACTION_NAMES.assemble,
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ACTION_NAMES.preprocess_assemble,
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]
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all_cpp_compile_actions = [
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ACTION_NAMES.cpp_compile,
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ACTION_NAMES.linkstamp_compile,
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ACTION_NAMES.cpp_header_parsing,
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ACTION_NAMES.cpp_module_compile,
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ACTION_NAMES.cpp_module_codegen,
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]
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all_compile_actions = all_c_compile_actions + all_cpp_compile_actions
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preprocessor_compile_actions = [
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ACTION_NAMES.c_compile,
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ACTION_NAMES.cpp_compile,
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ACTION_NAMES.linkstamp_compile,
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ACTION_NAMES.preprocess_assemble,
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ACTION_NAMES.cpp_header_parsing,
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ACTION_NAMES.cpp_module_compile,
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]
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codegen_compile_actions = [
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ACTION_NAMES.c_compile,
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ACTION_NAMES.cpp_compile,
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ACTION_NAMES.linkstamp_compile,
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ACTION_NAMES.assemble,
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ACTION_NAMES.preprocess_assemble,
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ACTION_NAMES.cpp_module_codegen,
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]
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all_link_actions = [
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ACTION_NAMES.cpp_link_executable,
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ACTION_NAMES.cpp_link_dynamic_library,
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ACTION_NAMES.cpp_link_nodeps_dynamic_library,
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]
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def _impl(ctx):
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tool_paths = [
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tool_path(name = "ar", path = llvm_bindir + "/llvm-ar"),
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tool_path(name = "ld", path = clang_bindir + "/ld.lld"),
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tool_path(name = "cpp", path = clang_bindir + "/clang-cpp"),
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tool_path(name = "gcc", path = clang_bindir + "/clang++"),
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tool_path(name = "dwp", path = llvm_bindir + "/llvm-dwp"),
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tool_path(name = "gcov", path = llvm_bindir + "/llvm-cov"),
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tool_path(name = "nm", path = llvm_bindir + "/llvm-nm"),
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tool_path(name = "objcopy", path = llvm_bindir + "/llvm-objcopy"),
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tool_path(name = "objdump", path = llvm_bindir + "/llvm-objdump"),
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tool_path(name = "strip", path = llvm_bindir + "/llvm-strip"),
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]
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action_configs = [
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action_config(action_name = name, enabled = True, tools = [tool(path = clang_bindir + "/clang")])
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for name in all_c_compile_actions
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] + [
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action_config(action_name = name, enabled = True, tools = [tool(path = clang_bindir + "/clang++")])
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for name in all_cpp_compile_actions
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] + [
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action_config(action_name = name, enabled = True, tools = [tool(path = clang_bindir + "/clang++")])
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for name in all_link_actions
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] + [
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action_config(action_name = name, enabled = True, tools = [tool(path = llvm_bindir + "/llvm-ar")])
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for name in [ACTION_NAMES.cpp_link_static_library]
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] + [
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action_config(action_name = name, enabled = True, tools = [tool(path = llvm_bindir + "/llvm-strip")])
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for name in [ACTION_NAMES.strip]
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]
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std_compile_flags = ["-std=c++20"]
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# libc++ is only used on non-Windows platforms.
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if ctx.attr.target_os != "windows":
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std_compile_flags.append("-stdlib=libc++")
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# TODO: Regression that warns on anonymous unions; remove depending on fix.
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# Sets the flag for unknown clang versions, which are assumed to be at head.
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# https://github.com/llvm/llvm-project/issues/70384
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if not clang_version or clang_version == 18:
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missing_field_init_flags = ["-Wno-missing-field-initializers"]
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else:
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missing_field_init_flags = []
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default_flags_feature = feature(
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name = "default_flags",
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enabled = True,
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flag_sets = [
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flag_set(
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actions = all_compile_actions + all_link_actions,
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flag_groups = ([
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flag_group(
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flags = [
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"-no-canonical-prefixes",
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"-fcolor-diagnostics",
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],
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),
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]),
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),
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flag_set(
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actions = all_compile_actions,
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flag_groups = ([
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flag_group(
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flags = [
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"-Werror",
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"-Wall",
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"-Wextra",
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"-Wthread-safety",
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"-Wself-assign",
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"-Wimplicit-fallthrough",
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"-Wctad-maybe-unsupported",
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"-Wdelete-non-virtual-dtor",
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# Don't warn on external code as we can't
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# necessarily patch it easily.
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"--system-header-prefix=external/",
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# Compile actions shouldn't link anything.
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"-c",
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] + missing_field_init_flags,
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),
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flag_group(
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expand_if_available = "output_assembly_file",
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flags = ["-S"],
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),
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flag_group(
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expand_if_available = "output_preprocess_file",
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flags = ["-E"],
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),
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flag_group(
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flags = ["-MD", "-MF", "%{dependency_file}"],
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expand_if_available = "dependency_file",
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),
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flag_group(
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flags = ["-frandom-seed=%{output_file}"],
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expand_if_available = "output_file",
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),
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]),
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),
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flag_set(
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actions = all_cpp_compile_actions + all_link_actions,
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flag_groups = ([
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flag_group(
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flags = std_compile_flags,
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),
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]),
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),
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flag_set(
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actions = codegen_compile_actions,
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flag_groups = ([
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flag_group(
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flags = [
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"-ffunction-sections",
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"-fdata-sections",
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],
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),
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]),
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),
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flag_set(
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actions = codegen_compile_actions,
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flag_groups = [
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flag_group(flags = ["-fPIC"], expand_if_available = "pic"),
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],
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),
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flag_set(
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actions = preprocessor_compile_actions,
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flag_groups = [
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flag_group(
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flags = [
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# Disable a warning and override builtin macros to
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# ensure a hermetic build.
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"-Wno-builtin-macro-redefined",
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"-D__DATE__=\"redacted\"",
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"-D__TIMESTAMP__=\"redacted\"",
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"-D__TIME__=\"redacted\"",
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# Pass the clang version as a define so that bazel
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# caching is more likely to notice version changes.
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"-DCLANG_VERSION_FOR_CACHE=\"%s\"" % clang_version_for_cache,
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],
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),
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flag_group(
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flags = ["-D%{preprocessor_defines}"],
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iterate_over = "preprocessor_defines",
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),
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flag_group(
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flags = ["-include", "%{includes}"],
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iterate_over = "includes",
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expand_if_available = "includes",
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),
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flag_group(
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flags = ["-iquote", "%{quote_include_paths}"],
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iterate_over = "quote_include_paths",
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),
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flag_group(
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flags = ["-I%{include_paths}"],
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iterate_over = "include_paths",
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),
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flag_group(
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flags = ["-isystem", "%{system_include_paths}"],
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iterate_over = "system_include_paths",
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),
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],
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),
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flag_set(
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actions = [
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ACTION_NAMES.cpp_link_dynamic_library,
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ACTION_NAMES.cpp_link_nodeps_dynamic_library,
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],
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flag_groups = [flag_group(flags = ["-shared"])],
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),
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flag_set(
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actions = all_link_actions,
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flag_groups = [
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flag_group(
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flags = ["-Wl,--gdb-index"],
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expand_if_available = "is_using_fission",
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),
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flag_group(
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flags = ["-Wl,-S"],
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expand_if_available = "strip_debug_symbols",
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),
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flag_group(
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flags = ["-L%{library_search_directories}"],
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iterate_over = "library_search_directories",
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expand_if_available = "library_search_directories",
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),
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flag_group(
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iterate_over = "runtime_library_search_directories",
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flags = [
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"-Wl,-rpath,$ORIGIN/%{runtime_library_search_directories}",
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],
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expand_if_available =
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"runtime_library_search_directories",
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),
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],
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),
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],
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)
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# Handle different levels of optimization with individual features so that
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# they can be ordered and the defaults can override the minimal settings if
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# both are enabled.
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minimal_optimization_flags = feature(
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name = "minimal_optimization_flags",
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flag_sets = [
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flag_set(
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actions = codegen_compile_actions,
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flag_groups = [flag_group(flags = [
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"-O1",
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])],
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),
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],
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)
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default_optimization_flags = feature(
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name = "default_optimization_flags",
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enabled = True,
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requires = [feature_set(["opt"])],
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flag_sets = [
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flag_set(
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actions = all_compile_actions,
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flag_groups = [flag_group(flags = [
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"-DNDEBUG",
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])],
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),
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flag_set(
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actions = codegen_compile_actions,
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flag_groups = [flag_group(flags = [
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"-O3",
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])],
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),
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],
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)
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x86_64_cpu_flags = feature(
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name = "x86_64_cpu_flags",
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enabled = True,
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flag_sets = [
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flag_set(
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actions = all_compile_actions,
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flag_groups = [flag_group(flags = [
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"-march=x86-64-v2",
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])],
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),
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],
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)
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aarch64_cpu_flags = feature(
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name = "aarch64_cpu_flags",
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enabled = True,
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flag_sets = [
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flag_set(
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actions = all_compile_actions,
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flag_groups = [flag_group(flags = [
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"-march=armv8.2-a",
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])],
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),
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],
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)
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# Handle different levels and forms of debug info emission with individual
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# features so that they can be ordered and the defaults can override the
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# minimal settings if both are enabled.
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minimal_debug_info_flags = feature(
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name = "minimal_debug_info_flags",
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flag_sets = [
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flag_set(
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actions = codegen_compile_actions,
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flag_groups = [
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flag_group(
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flags = ["-gmlt"],
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),
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],
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),
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],
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)
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default_debug_info_flags = feature(
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name = "default_debug_info_flags",
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enabled = True,
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flag_sets = [
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flag_set(
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actions = codegen_compile_actions,
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flag_groups = ([
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flag_group(
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flags = ["-g"],
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),
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]),
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with_features = [with_feature_set(features = ["dbg"])],
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),
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flag_set(
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actions = codegen_compile_actions,
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flag_groups = [
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flag_group(
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flags = ["-gsplit-dwarf", "-g"],
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expand_if_available = "per_object_debug_info_file",
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),
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],
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),
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],
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)
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# This feature can be enabled in conjunction with any optimizations to
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# ensure accurate call stacks and backtraces for profilers or errors.
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preserve_call_stacks = feature(
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name = "preserve_call_stacks",
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flag_sets = [flag_set(
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actions = codegen_compile_actions,
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flag_groups = [flag_group(flags = [
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# Ensure good backtraces by preserving frame pointers and
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# disabling tail call elimination.
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"-fno-omit-frame-pointer",
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"-mno-omit-leaf-frame-pointer",
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"-fno-optimize-sibling-calls",
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])],
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)],
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)
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sysroot_feature = feature(
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name = "sysroot",
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enabled = True,
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flag_sets = [
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flag_set(
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actions = all_compile_actions + all_link_actions,
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flag_groups = [
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flag_group(
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flags = ["--sysroot=%{sysroot}"],
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expand_if_available = "sysroot",
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),
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],
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),
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],
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)
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use_module_maps = feature(
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name = "use_module_maps",
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requires = [feature_set(features = ["module_maps"])],
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flag_sets = [
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flag_set(
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actions = [
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ACTION_NAMES.c_compile,
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ACTION_NAMES.cpp_compile,
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ACTION_NAMES.cpp_header_parsing,
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ACTION_NAMES.cpp_module_compile,
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],
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flag_groups = [
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# These flag groups are separate so they do not expand to
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# the cross product of the variables.
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flag_group(flags = ["-fmodule-name=%{module_name}"]),
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flag_group(
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flags = ["-fmodule-map-file=%{module_map_file}"],
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),
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],
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),
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],
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)
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# Tell bazel we support module maps in general, so they will be generated
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# for all c/c++ rules.
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# Note: not all C++ rules support module maps; thus, do not imply this
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# feature from other features - instead, require it.
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module_maps = feature(
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name = "module_maps",
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enabled = True,
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implies = [
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# "module_map_home_cwd",
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# "module_map_without_extern_module",
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# "generate_submodules",
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],
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)
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layering_check = feature(
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name = "layering_check",
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implies = ["use_module_maps"],
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flag_sets = [
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flag_set(
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actions = [
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ACTION_NAMES.c_compile,
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ACTION_NAMES.cpp_compile,
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ACTION_NAMES.cpp_header_parsing,
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ACTION_NAMES.cpp_module_compile,
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],
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flag_groups = [
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flag_group(flags = [
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"-fmodules-strict-decluse",
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"-Wprivate-header",
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]),
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flag_group(
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iterate_over = "dependent_module_map_files",
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flags = [
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"-fmodule-map-file=%{dependent_module_map_files}",
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],
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),
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],
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),
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],
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)
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sanitizer_common_flags = feature(
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name = "sanitizer_common_flags",
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requires = [feature_set(["nonhost"])],
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implies = ["minimal_optimization_flags", "minimal_debug_info_flags", "preserve_call_stacks"],
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)
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# Separated from the feature above so it can only be included on platforms
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# where it is supported. There is no negative flag in Clang so we can't just
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# override it later.
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sanitizer_static_lib_flags = feature(
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name = "sanitizer_static_lib_flags",
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enabled = True,
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requires = [feature_set(["sanitizer_common_flags"])],
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flag_sets = [flag_set(
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actions = all_link_actions,
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flag_groups = [flag_group(flags = [
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"-static-libsan",
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])],
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)],
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)
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asan = feature(
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name = "asan",
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requires = [feature_set(["nonhost"])],
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implies = ["sanitizer_common_flags"],
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flag_sets = [flag_set(
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actions = all_compile_actions + all_link_actions,
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flag_groups = [flag_group(flags = [
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"-fsanitize=address,undefined,nullability",
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"-fsanitize-address-use-after-scope",
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# We don't need the recovery behavior of UBSan as we expect
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# builds to be clean. Not recovering is a bit cheaper.
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"-fno-sanitize-recover=undefined",
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# Don't embed the full path name for files. This limits the size
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# and combined with line numbers is unlikely to result in many
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# ambiguities.
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"-fsanitize-undefined-strip-path-components=-1",
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# Needed due to clang AST issues, such as in
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# clang/AST/Redeclarable.h line 199.
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"-fno-sanitize=vptr",
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])],
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)],
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)
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# Likely due to being unable to use the static-linked and up-to-date
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# sanitizer runtimes, we have to disable a number of sanitizers on macOS.
|
|
macos_asan_workarounds = feature(
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|
name = "macos_sanitizer_workarounds",
|
|
enabled = True,
|
|
requires = [feature_set(["asan"])],
|
|
flag_sets = [flag_set(
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|
actions = all_compile_actions + all_link_actions,
|
|
flag_groups = [flag_group(flags = [
|
|
"-fno-sanitize=function",
|
|
])],
|
|
)],
|
|
)
|
|
|
|
enable_asan_in_fastbuild = feature(
|
|
name = "enable_asan_in_fastbuild",
|
|
enabled = True,
|
|
requires = [feature_set(["nonhost", "fastbuild"])],
|
|
implies = ["asan"],
|
|
)
|
|
|
|
fuzzer = feature(
|
|
name = "fuzzer",
|
|
requires = [feature_set(["nonhost"])],
|
|
implies = ["asan"],
|
|
flag_sets = [flag_set(
|
|
actions = all_compile_actions + all_link_actions,
|
|
flag_groups = [flag_group(flags = [
|
|
"-fsanitize=fuzzer-no-link",
|
|
])],
|
|
)],
|
|
)
|
|
|
|
if clang_version and clang_version <= 16:
|
|
libcpp_debug_flags = ["-D_LIBCPP_ENABLE_ASSERTIONS=1"]
|
|
else:
|
|
# Clang 17 deprecates LIBCPP_ENABLE_ASSERTIONS in favor of
|
|
# HARDENED_MODE.
|
|
libcpp_debug_flags = ["-D_LIBCPP_ENABLE_HARDENED_MODE=1"]
|
|
|
|
linux_flags_feature = feature(
|
|
name = "linux_flags",
|
|
enabled = True,
|
|
flag_sets = [
|
|
flag_set(
|
|
actions = all_link_actions,
|
|
flag_groups = ([
|
|
flag_group(
|
|
flags = [
|
|
"-fuse-ld=lld",
|
|
"-stdlib=libc++",
|
|
"-unwindlib=libunwind",
|
|
# Force the C++ standard library and runtime
|
|
# libraries to be statically linked. This works even
|
|
# with libc++ and libunwind despite the names,
|
|
# provided libc++ is built with the CMake option:
|
|
# - `-DCMAKE_POSITION_INDEPENDENT_CODE=ON`
|
|
"-static-libstdc++",
|
|
"-static-libgcc",
|
|
# Link with Clang's runtime library. This is always
|
|
# linked statically.
|
|
"-rtlib=compiler-rt",
|
|
# Explicitly add LLVM libs to the search path to
|
|
# preempt the detected GCC installation's library
|
|
# paths. Those might have a system installed libc++
|
|
# and we want to find the one next to our Clang.
|
|
"-L" + llvm_bindir + "/../lib",
|
|
# Link with pthread.
|
|
"-lpthread",
|
|
# Force linking the static libc++abi archive here.
|
|
# This *should* be linked automatically, but not
|
|
# every release of LLVM correctly sets the CMake
|
|
# flags to do so.
|
|
"-l:libc++abi.a",
|
|
],
|
|
),
|
|
]),
|
|
),
|
|
flag_set(
|
|
actions = all_compile_actions,
|
|
flag_groups = [flag_group(flags = libcpp_debug_flags)],
|
|
with_features = [
|
|
with_feature_set(not_features = ["opt"]),
|
|
],
|
|
),
|
|
flag_set(
|
|
actions = [
|
|
ACTION_NAMES.cpp_link_executable,
|
|
],
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["-pie"],
|
|
expand_if_available = "force_pic",
|
|
),
|
|
],
|
|
),
|
|
],
|
|
)
|
|
|
|
macos_flags_feature = feature(
|
|
name = "macos_flags",
|
|
enabled = True,
|
|
flag_sets = [
|
|
flag_set(
|
|
actions = [
|
|
ACTION_NAMES.cpp_link_executable,
|
|
],
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["-fpie"],
|
|
expand_if_available = "force_pic",
|
|
),
|
|
],
|
|
),
|
|
],
|
|
)
|
|
|
|
freebsd_flags_feature = feature(
|
|
name = "freebsd_flags",
|
|
enabled = True,
|
|
flag_sets = [
|
|
flag_set(
|
|
actions = [
|
|
ACTION_NAMES.c_compile,
|
|
ACTION_NAMES.cpp_compile,
|
|
ACTION_NAMES.cpp_header_parsing,
|
|
ACTION_NAMES.cpp_module_compile,
|
|
],
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = [
|
|
"-DHAVE_MALLCTL",
|
|
],
|
|
),
|
|
],
|
|
),
|
|
flag_set(
|
|
actions = [
|
|
ACTION_NAMES.cpp_link_executable,
|
|
],
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["-fpie"],
|
|
expand_if_available = "force_pic",
|
|
),
|
|
],
|
|
),
|
|
],
|
|
)
|
|
|
|
default_link_libraries_feature = feature(
|
|
name = "default_link_libraries",
|
|
enabled = True,
|
|
flag_sets = [
|
|
flag_set(
|
|
actions = all_link_actions,
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["%{linkstamp_paths}"],
|
|
iterate_over = "linkstamp_paths",
|
|
expand_if_available = "linkstamp_paths",
|
|
),
|
|
flag_group(
|
|
iterate_over = "libraries_to_link",
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["-Wl,--start-lib"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "object_file_group",
|
|
),
|
|
),
|
|
flag_group(
|
|
flags = ["-Wl,-whole-archive"],
|
|
expand_if_true = "libraries_to_link.is_whole_archive",
|
|
),
|
|
flag_group(
|
|
flags = ["%{libraries_to_link.object_files}"],
|
|
iterate_over = "libraries_to_link.object_files",
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "object_file_group",
|
|
),
|
|
),
|
|
flag_group(
|
|
flags = ["%{libraries_to_link.name}"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "object_file",
|
|
),
|
|
),
|
|
flag_group(
|
|
flags = ["%{libraries_to_link.name}"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "interface_library",
|
|
),
|
|
),
|
|
flag_group(
|
|
flags = ["%{libraries_to_link.name}"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "static_library",
|
|
),
|
|
),
|
|
flag_group(
|
|
flags = ["-l%{libraries_to_link.name}"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "dynamic_library",
|
|
),
|
|
),
|
|
flag_group(
|
|
flags = ["-l:%{libraries_to_link.name}"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "versioned_dynamic_library",
|
|
),
|
|
),
|
|
flag_group(
|
|
flags = ["-Wl,-no-whole-archive"],
|
|
expand_if_true = "libraries_to_link.is_whole_archive",
|
|
),
|
|
flag_group(
|
|
flags = ["-Wl,--end-lib"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "object_file_group",
|
|
),
|
|
),
|
|
],
|
|
expand_if_available = "libraries_to_link",
|
|
),
|
|
# Note that the params file comes at the end, after the
|
|
# libraries to link above.
|
|
flag_group(
|
|
expand_if_available = "linker_param_file",
|
|
flags = ["@%{linker_param_file}"],
|
|
),
|
|
],
|
|
),
|
|
],
|
|
)
|
|
|
|
macos_link_libraries_feature = feature(
|
|
name = "macos_link_libraries",
|
|
enabled = True,
|
|
flag_sets = [
|
|
flag_set(
|
|
actions = all_link_actions,
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["%{linkstamp_paths}"],
|
|
iterate_over = "linkstamp_paths",
|
|
expand_if_available = "linkstamp_paths",
|
|
),
|
|
flag_group(
|
|
iterate_over = "libraries_to_link",
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["-Wl,--start-lib"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "object_file_group",
|
|
),
|
|
),
|
|
flag_group(
|
|
iterate_over = "libraries_to_link.object_files",
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "object_file_group",
|
|
),
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["%{libraries_to_link.object_files}"],
|
|
expand_if_false = "libraries_to_link.is_whole_archive",
|
|
),
|
|
flag_group(
|
|
flags = ["-Wl,-force_load,%{libraries_to_link.object_files}"],
|
|
expand_if_true = "libraries_to_link.is_whole_archive",
|
|
),
|
|
],
|
|
),
|
|
flag_group(
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "object_file",
|
|
),
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["%{libraries_to_link.name}"],
|
|
expand_if_false = "libraries_to_link.is_whole_archive",
|
|
),
|
|
flag_group(
|
|
flags = ["-Wl,-force_load,%{libraries_to_link.name}"],
|
|
expand_if_true = "libraries_to_link.is_whole_archive",
|
|
),
|
|
],
|
|
),
|
|
flag_group(
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "interface_library",
|
|
),
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["%{libraries_to_link.name}"],
|
|
expand_if_false = "libraries_to_link.is_whole_archive",
|
|
),
|
|
flag_group(
|
|
flags = ["-Wl,-force_load,%{libraries_to_link.name}"],
|
|
expand_if_true = "libraries_to_link.is_whole_archive",
|
|
),
|
|
],
|
|
),
|
|
flag_group(
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "static_library",
|
|
),
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["%{libraries_to_link.name}"],
|
|
expand_if_false = "libraries_to_link.is_whole_archive",
|
|
),
|
|
flag_group(
|
|
flags = ["-Wl,-force_load,%{libraries_to_link.name}"],
|
|
expand_if_true = "libraries_to_link.is_whole_archive",
|
|
),
|
|
],
|
|
),
|
|
flag_group(
|
|
flags = ["-l%{libraries_to_link.name}"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "dynamic_library",
|
|
),
|
|
),
|
|
flag_group(
|
|
flags = ["-l:%{libraries_to_link.name}"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "versioned_dynamic_library",
|
|
),
|
|
),
|
|
flag_group(
|
|
expand_if_true = "libraries_to_link.is_whole_archive",
|
|
flag_groups = [
|
|
flag_group(
|
|
expand_if_false = "macos_flags",
|
|
flags = ["-Wl,-no-whole-archive"],
|
|
),
|
|
],
|
|
),
|
|
flag_group(
|
|
flags = ["-Wl,--end-lib"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "object_file_group",
|
|
),
|
|
),
|
|
],
|
|
expand_if_available = "libraries_to_link",
|
|
),
|
|
# Note that the params file comes at the end, after the
|
|
# libraries to link above.
|
|
flag_group(
|
|
expand_if_available = "linker_param_file",
|
|
flags = ["@%{linker_param_file}"],
|
|
),
|
|
],
|
|
),
|
|
],
|
|
)
|
|
|
|
# Place user provided compile flags after all the features so that these
|
|
# flags can override or customize behavior. The only thing user flags
|
|
# cannot override is the output file as Bazel depends on that.
|
|
#
|
|
# Finally, place the source file (if present) and output file last to make
|
|
# reading the compile command lines easier for humans.
|
|
final_flags_feature = feature(
|
|
name = "final_flags",
|
|
enabled = True,
|
|
flag_sets = [
|
|
flag_set(
|
|
actions = all_compile_actions,
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["%{user_compile_flags}"],
|
|
iterate_over = "user_compile_flags",
|
|
expand_if_available = "user_compile_flags",
|
|
),
|
|
flag_group(
|
|
flags = ["%{source_file}"],
|
|
expand_if_available = "source_file",
|
|
),
|
|
flag_group(
|
|
expand_if_available = "output_file",
|
|
flags = ["-o", "%{output_file}"],
|
|
),
|
|
],
|
|
),
|
|
flag_set(
|
|
actions = all_link_actions,
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["%{user_link_flags}"],
|
|
iterate_over = "user_link_flags",
|
|
expand_if_available = "user_link_flags",
|
|
),
|
|
flag_group(
|
|
flags = ["-o", "%{output_execpath}"],
|
|
expand_if_available = "output_execpath",
|
|
),
|
|
],
|
|
),
|
|
],
|
|
)
|
|
|
|
# Archive actions have an entirely independent set of flags and don't
|
|
# interact with either compiler or link actions.
|
|
default_archiver_flags_feature = feature(
|
|
name = "default_archiver_flags",
|
|
enabled = True,
|
|
flag_sets = [
|
|
flag_set(
|
|
actions = [ACTION_NAMES.cpp_link_static_library],
|
|
flag_groups = [
|
|
flag_group(flags = ["rcsD"]),
|
|
flag_group(
|
|
flags = ["%{output_execpath}"],
|
|
expand_if_available = "output_execpath",
|
|
),
|
|
flag_group(
|
|
iterate_over = "libraries_to_link",
|
|
flag_groups = [
|
|
flag_group(
|
|
flags = ["%{libraries_to_link.name}"],
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "object_file",
|
|
),
|
|
),
|
|
flag_group(
|
|
flags = ["%{libraries_to_link.object_files}"],
|
|
iterate_over = "libraries_to_link.object_files",
|
|
expand_if_equal = variable_with_value(
|
|
name = "libraries_to_link.type",
|
|
value = "object_file_group",
|
|
),
|
|
),
|
|
],
|
|
expand_if_available = "libraries_to_link",
|
|
),
|
|
flag_group(
|
|
expand_if_available = "linker_param_file",
|
|
flags = ["@%{linker_param_file}"],
|
|
),
|
|
],
|
|
),
|
|
],
|
|
)
|
|
|
|
# Now that we have built up the constituent feature definitions, compose
|
|
# them, including configuration based on the target platform.
|
|
|
|
# First, define features that are simply used to configure others.
|
|
features = [
|
|
feature(name = "dbg"),
|
|
feature(name = "fastbuild"),
|
|
feature(name = "host"),
|
|
feature(name = "no_legacy_features"),
|
|
feature(name = "nonhost"),
|
|
feature(name = "opt"),
|
|
feature(name = "supports_dynamic_linker", enabled = ctx.attr.target_os == "linux"),
|
|
feature(name = "supports_pic", enabled = True),
|
|
feature(name = "supports_start_end_lib", enabled = ctx.attr.target_os == "linux"),
|
|
]
|
|
|
|
# The order of the features determines the relative order of flags used.
|
|
# Start off adding the baseline features.
|
|
features += [
|
|
default_flags_feature,
|
|
minimal_optimization_flags,
|
|
default_optimization_flags,
|
|
minimal_debug_info_flags,
|
|
default_debug_info_flags,
|
|
preserve_call_stacks,
|
|
sysroot_feature,
|
|
sanitizer_common_flags,
|
|
asan,
|
|
enable_asan_in_fastbuild,
|
|
fuzzer,
|
|
layering_check,
|
|
module_maps,
|
|
use_module_maps,
|
|
default_archiver_flags_feature,
|
|
]
|
|
|
|
# Next, add the features based on the target platform. Here too the
|
|
# features are order sensitive. We also setup the sysroot here.
|
|
if ctx.attr.target_os == "linux":
|
|
features.append(sanitizer_static_lib_flags)
|
|
features.append(linux_flags_feature)
|
|
sysroot = None
|
|
elif ctx.attr.target_os == "windows":
|
|
# TODO: Need to figure out if we need to add windows specific features
|
|
# I think the .pdb debug files will need to be handled differently,
|
|
# so that might be an example where a feature must be added.
|
|
sysroot = None
|
|
elif ctx.attr.target_os == "macos":
|
|
features.append(macos_asan_workarounds)
|
|
features.append(macos_flags_feature)
|
|
sysroot = sysroot_dir
|
|
elif ctx.attr.target_os == "freebsd":
|
|
features.append(sanitizer_static_lib_flags)
|
|
features.append(freebsd_flags_feature)
|
|
sysroot = sysroot_dir
|
|
else:
|
|
fail("Unsupported target OS!")
|
|
|
|
if ctx.attr.target_cpu in ["aarch64", "arm64"]:
|
|
features.append(aarch64_cpu_flags)
|
|
else:
|
|
features.append(x86_64_cpu_flags)
|
|
|
|
# Finally append the libraries to link and any final flags.
|
|
if ctx.attr.target_os == "macos":
|
|
features.append(macos_link_libraries_feature)
|
|
else:
|
|
features.append(default_link_libraries_feature)
|
|
features.append(final_flags_feature)
|
|
|
|
identifier = "local-{0}-{1}".format(ctx.attr.target_cpu, ctx.attr.target_os)
|
|
return cc_common.create_cc_toolchain_config_info(
|
|
ctx = ctx,
|
|
features = features,
|
|
action_configs = action_configs,
|
|
cxx_builtin_include_directories = clang_include_dirs_list + [
|
|
# Add Clang's resource directory to the end of the builtin include
|
|
# directories to cover the use of sanitizer resource files by the driver.
|
|
clang_resource_dir + "/share",
|
|
],
|
|
builtin_sysroot = sysroot,
|
|
|
|
# This configuration only supports local non-cross builds so derive
|
|
# everything from the target CPU selected.
|
|
toolchain_identifier = identifier,
|
|
host_system_name = identifier,
|
|
target_system_name = identifier,
|
|
target_cpu = ctx.attr.target_cpu,
|
|
|
|
# These attributes aren't meaningful at all so just use placeholder
|
|
# values.
|
|
target_libc = "local",
|
|
compiler = "local",
|
|
abi_version = "local",
|
|
abi_libc_version = "local",
|
|
|
|
# We do have to pass in our tool paths.
|
|
tool_paths = tool_paths,
|
|
)
|
|
|
|
cc_toolchain_config = rule(
|
|
implementation = _impl,
|
|
attrs = {
|
|
"target_cpu": attr.string(mandatory = True),
|
|
"target_os": attr.string(mandatory = True),
|
|
},
|
|
provides = [CcToolchainConfigInfo],
|
|
)
|
|
|
|
def cc_local_toolchain_suite(name, configs):
|
|
"""Create a toolchain suite that uses the local Clang/LLVM install.
|
|
|
|
Args:
|
|
name: The name of the toolchain suite to produce.
|
|
configs: An array of (os, cpu) pairs to support in the toolchain.
|
|
"""
|
|
|
|
# An empty filegroup to use when stubbing out the toolchains.
|
|
native.filegroup(
|
|
name = name + "_empty",
|
|
srcs = [],
|
|
)
|
|
|
|
# Create the individual local toolchains for each CPU.
|
|
for (os, cpu) in configs:
|
|
config_name = "{0}_{1}_{2}".format(name, os, cpu)
|
|
cc_toolchain_config(
|
|
name = config_name + "_config",
|
|
target_os = os,
|
|
target_cpu = cpu,
|
|
)
|
|
cc_toolchain(
|
|
name = config_name + "_tools",
|
|
all_files = ":" + name + "_empty",
|
|
ar_files = ":" + name + "_empty",
|
|
as_files = ":" + name + "_empty",
|
|
compiler_files = ":" + name + "_empty",
|
|
dwp_files = ":" + name + "_empty",
|
|
linker_files = ":" + name + "_empty",
|
|
objcopy_files = ":" + name + "_empty",
|
|
strip_files = ":" + name + "_empty",
|
|
supports_param_files = 1,
|
|
toolchain_config = ":" + config_name + "_config",
|
|
toolchain_identifier = config_name,
|
|
)
|
|
compatible_with = ["@platforms//cpu:" + cpu, "@platforms//os:" + os]
|
|
native.toolchain(
|
|
name = config_name,
|
|
exec_compatible_with = compatible_with,
|
|
target_compatible_with = compatible_with,
|
|
toolchain = config_name + "_tools",
|
|
toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
|
|
)
|