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https://github.com/carbon-language/carbon-lang.git
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Chandler Carruth
0a7895e218
Also add one more flag to our `.bazelrc` to improve the overall build efficiency. While the first build with this will be very slow (likely a couple of hours), the caching layer we are using now should effectively cache this for subsequent builds so that only the changed files have to be recompiled. Updates to Clang and LLVM themselves will still result in a slow rebuild, but normal development should remain fast.
69 lines
3.1 KiB
Plaintext
69 lines
3.1 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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build --crosstool_top=@bazel_cc_toolchain
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build --host_crosstool_top=@bazel_cc_toolchain
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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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# Note that this cache will grow without bound currently. You should
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# periodically run the `scripts/clean_disk_cache.sh` script or some equivalent.
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# https://github.com/bazelbuild/bazel/issues/5139 tracks fixing this in Bazel.
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build --disk_cache=~/.cache/carbon-lang-build-cache
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# Enable some safety when using the build cache, likely to be defaulted in
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# future Bazel releases.
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build --experimental_guard_against_concurrent_changes
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# Allow the toolchain to configure itself differently in the host build from
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# the target build. Even when the host and target platforms are ostensibly the
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# same (and use identical toolchains), it is beneficial to be able to configure
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# the specific toolchain features enabled for the target separately from the
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# host. For example, sanitizers make sense for the target significantly more
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# than for the host.
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#
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# Bazel bug tracking undoing the default here:
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# https://github.com/bazelbuild/bazel/issues/13315
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build --incompatible_dont_enable_host_nonhost_crosstool_features=false
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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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build --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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build --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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build --strip=never
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# Configuration for enabling Address Sanitizer. Note that this is enabled by
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# default for fastbuild. The config is provided to enable ASan even in
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# optimized or other build configurations.
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build:asan --features=asan
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# Configuration for enabling LibFuzzer (along with ASan).
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build:fuzzer --features=fuzzer
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# Always allow tests to symbolize themselves with whatever `llvm-symbolize` is
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# in the users environment.
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build --test_env=ASAN_SYMBOLIZER_PATH
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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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build --action_env=LANG=en_US.UTF-8
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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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