mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 13:50:10 +01:00
Dana Jansens
95897201ee
There's no way for the user to override and disable the disk cache once a path is specified in our current version of bazel. Later versions would allow the user to specify `--nodisk-cache`. If the user really wants a disk cache anyway, they can specify as such in their `user.bazelrc` file.
228 lines
10 KiB
Plaintext
228 lines
10 KiB
Plaintext
# 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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# Setup stamping with Carbon's workspace status attached but disable it by
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# default.
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#
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# Note that while we have minimized the impact of stamping on build caching, it
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# still has a meaningful impact, especially during development. So we disable
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# stamping by default and builds that need to include the workspace status
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# should explicitly enable it with `--stamp`.
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common --workspace_status_command=./scripts/workspace_status.py
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common --nostamp
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# Provide aliases for configuring the release and pre-release version being
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# built. For documentation of these flags, see //bazel/version/BUILD.
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common --flag_alias=release=//bazel/version:release
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common --flag_alias=pre_release=//bazel/version:pre_release
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common --flag_alias=rc_number=//bazel/version:rc_number
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common --flag_alias=nightly_date=//bazel/version:nightly_date
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# Support running clang-tidy with:
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# bazel build --config=clang-tidy -k //...
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# See: https://github.com/erenon/bazel_clang_tidy
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common:clang-tidy --aspects @bazel_clang_tidy//clang_tidy:clang_tidy.bzl%clang_tidy_aspect
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common:clang-tidy --output_groups=report
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common:clang-tidy --@bazel_clang_tidy//:clang_tidy_config=//:clang_tidy_config
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common:clang-tidy --action_env=PATH --host_action_env=PATH
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# This warning seems to incorrectly fire in this build configuration, despite
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# not firing in our normal builds.
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common:clang-tidy --copt=-Wno-unknown-pragmas
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# --config=non-fatal-checks makes CHECK failures not terminate compilation.
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common:non-fatal-checks --per_file_copt=common/check_internal.cpp@-DCARBON_NON_FATAL_CHECKS
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# Provide an alias for controlling the `carbon_*` Bazel rules' configuration. We
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# enable use of the target config here to make our build and tests more
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# efficient, see the documentation in //bazel/carbon_rules/BUILD for details.
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common --flag_alias=use_target_config_carbon_rules=//bazel/carbon_rules:use_target_config_carbon_rules
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# Bazel doesn't track what commands the flag_alias is valid for, so we can't use
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# common here.
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build --use_target_config_carbon_rules
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# Default to using a disk cache to minimize re-building LLVM and Clang which we
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# try to avoid updating too frequently to minimize rebuild cost. The location
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# here can be overridden in the user configuration where needed.
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#
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# We avoid the disk cache on MacOS because it breaks debugging. When the cache
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# is used, the separate debug symbol files are not perserved.
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common:linux --disk_cache=~/.cache/carbon-lang-build-cache
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common:windows --disk_cache=~/.cache/carbon-lang-build-cache
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# If you'd like a different disk cache size, override it by copying this
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# line to `user.bazelrc` in the repository root and modify the number there.
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common --experimental_disk_cache_gc_max_size=100G
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# Enable some safety when using the build cache. Defaults to `lite`.
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common --guard_against_concurrent_changes=full
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# Used by clang_configuration.bzl.
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common --action_env=CC --host_action_env=CC
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common --action_env=CMAKE_SYSROOT --host_action_env=CMAKE_SYSROOT
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# Disable warnings for all external compilations. These involve code that isn't
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# developed as part of Carbon and may be difficult or impossible to patch, so
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# warnings aren't likely to be actionable.
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common --per_file_copt=external/.*\.(c|cc|cpp|cxx)$@-w
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common --host_per_file_copt=external/.*\.(c|cc|cpp|cxx)$@-w
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# Default dynamic linking to off. While this can help build performance in some
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# edge cases with very large linked executables and a slow linker, between using
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# fast linkers on all platforms (LLD and the Apple linker), as well as having
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# relatively few such executables, shared objects simply waste too much space in
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# our builds.
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common --dynamic_mode=off
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# Always compile PIC code. There are few if any disadvantages on the platforms
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# and architectures we care about and it avoids the need to compile files twice.
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common --force_pic
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# Completely disable Bazel's automatic stripping of debug information. Removing
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# that information causes unhelpful backtraces from unittest failures and other
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# crashes. Optimized builds already avoid using debug information by default.
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common --strip=never
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# Enable Abseil for GoogleTest.
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common --define=absl=1
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# Enable TCMalloc on Linux in optimized builds.
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common --custom_malloc=//bazel/malloc:tcmalloc_if_linux_opt
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# Configuration for enabling Address Sanitizer. Note that ASan and TCMalloc are
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# incompatible so this explicitly forces the system malloc.
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common:asan --features=asan
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common:asan --custom_malloc=@bazel_tools//tools/cpp:malloc
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# Also double the test timeouts for ASan to improve their consistency.
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test:asan --test_timeout=120,600,1800,-1
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# Configuration for enabling LibFuzzer (along with ASan).
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common:fuzzer --features=fuzzer
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# Force actions to have a UTF-8 language encoding.
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# TODO: Need to investigate what this should be on Windows, but at least for
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# Linux and macOS this seems strictly better than the Bazel default of just
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# `en_US`.
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common --action_env=LANG=en_US.UTF-8
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# Allow per-platform configuration.
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common --enable_platform_specific_config
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# Enable libpfm for google_benchmark on Linux only.
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common:linux --define=pfm=1
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# Enable split debug info on Linux, which is significantly more space efficient
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# and should work well with modern debuggers. Note that this is Linux specific
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# as macOS has its own approach that is always partially but not completely
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# split.
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#
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# Note: if using GDB, see documentation to get that working:
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# https://docs.carbon-lang.dev/docs/project/contribution_tools.html#debugging-with-gdb-instead-of-lldb
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#
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# TODO: Bazel has a bug where it doesn't manage dwo files in the cache correctly.
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# common:linux --fission=yes
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# Disables `actions.declare_symlink`. Done for cross-environment support.
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common --allow_unresolved_symlinks=false
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# Removes the leading `/proc/self/cwd/` from file paths in the debug info. Some
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# tools like VS Code don't understand `/proc/self/cwd` in places like terminal
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# stack dumps, but do understand paths relative to the workspace root.
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common --copt=-fdebug-prefix-map=/proc/self/cwd=
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# Allow users to override any of the flags desired by importing a user-specific
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# RC file here if present.
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try-import %workspace%/user.bazelrc
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# Query error in `@bazel_tools`. This reproduces with
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# `bazel query 'deps(//...)'`.
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# TODO: Enable the flag once compatibility issues are fixed.
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# common --incompatible_disable_non_executable_java_binary
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# Incompatible with the clang-tidy build mode.
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# TODO: Enable the flag once compatibility issues are fixed.
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# common --incompatible_auto_exec_groups
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# Incompatible with `rules_cc`.
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# TODO: Enable the flag once compatibility issues are fixed.
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# common --incompatible_no_rule_outputs_param
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# common --incompatible_stop_exporting_language_modules
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# Incompatible with `rules_pkg`.
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# TODO: Enable the flag once compatibility issues are fixed.
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# common --incompatible_disable_target_default_provider_fields
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# Incompatible with `rules_shell`.
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# TODO: Enable the flag once compatibility issues are fixed.
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# common --incompatible_check_visibility_for_toolchains
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# Enable as many incompatible flags as we can, per
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# https://bazel.build/release/backward-compatibility. To get the latest list,
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# using `bazelisk --migrate build //...` will help.
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common --incompatible_allow_tags_propagation
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common --incompatible_always_check_depset_elements
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common --incompatible_always_include_files_in_data
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common --incompatible_bazel_test_exec_run_under
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common --incompatible_check_sharding_support
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common --incompatible_check_testonly_for_output_files
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common --incompatible_config_setting_private_default_visibility
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common --incompatible_default_to_explicit_init_py
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common --incompatible_depset_for_java_output_source_jars
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common --incompatible_depset_for_libraries_to_link_getter
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common --incompatible_disable_autoloads_in_main_repo
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common --incompatible_disable_native_android_rules
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common --incompatible_disable_native_repo_rules
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common --incompatible_disable_objc_library_transition
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common --incompatible_disable_starlark_host_transitions
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common --incompatible_disable_target_provider_fields
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common --incompatible_disallow_ctx_resolve_tools
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common --incompatible_disallow_empty_glob
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common --incompatible_disallow_legacy_py_provider
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common --incompatible_disallow_sdk_frameworks_attributes
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common --incompatible_disallow_struct_provider_syntax
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common --incompatible_dont_enable_host_nonhost_crosstool_features
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common --incompatible_dont_use_javasourceinfoprovider
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common --incompatible_enable_apple_toolchain_resolution
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common --incompatible_enable_deprecated_label_apis
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common --incompatible_enable_proto_toolchain_resolution
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common --incompatible_enforce_config_setting_visibility
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common --incompatible_enforce_starlark_utf8
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common --incompatible_exclusive_test_sandboxed
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common --incompatible_fail_on_unknown_attributes
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common --incompatible_fix_package_group_reporoot_syntax
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common --incompatible_java_common_parameters
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common --incompatible_legacy_local_fallback
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common --incompatible_locations_prefers_executable
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common --incompatible_make_thinlto_command_lines_standalone
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common --incompatible_merge_fixed_and_default_shell_env
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common --incompatible_merge_genfiles_directory
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common --incompatible_modify_execution_info_additive
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common --incompatible_new_actions_api
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common --incompatible_no_attr_license
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common --incompatible_no_implicit_file_export
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common --incompatible_no_implicit_watch_label
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common --incompatible_objc_alwayslink_by_default
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common --incompatible_package_group_has_public_syntax
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common --incompatible_py2_outputs_are_suffixed
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common --incompatible_py3_is_default
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common --incompatible_python_disable_py2
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common --incompatible_python_disallow_native_rules
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common --incompatible_remote_use_new_exit_code_for_lost_inputs
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common --incompatible_remove_legacy_whole_archive
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common --incompatible_require_ctx_in_configure_features
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common --incompatible_require_linker_input_cc_api
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common --incompatible_run_shell_command_string
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common --incompatible_sandbox_hermetic_tmp
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common --incompatible_simplify_unconditional_selects_in_rule_attrs
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common --incompatible_stop_exporting_build_file_path
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common --incompatible_strict_action_env
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common --incompatible_strip_executable_safely
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common --incompatible_top_level_aspects_require_providers
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common --incompatible_unambiguous_label_stringification
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common --incompatible_use_cc_configure_from_rules_cc
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common --incompatible_use_new_cgroup_implementation
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common --incompatible_use_plus_in_repo_names
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common --incompatible_use_python_toolchains
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common --incompatible_validate_top_level_header_inclusions
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common --incompatible_visibility_private_attributes_at_definition
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