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Use bootstrapped llvm toolchain #707

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8a27401
WIP: Use bootstrapped llvm toolchain
dzbarsky Nov 9, 2025
bcc38b2
Pre-commit changes
aspect-marvin Dec 16, 2025
ae3be41
fixups
dzbarsky Dec 16, 2025
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2 changes: 1 addition & 1 deletion .aspect/workflows/config.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@ tasks:
- type: before_task
command: |
rm .bazelversion
echo "USE_BAZEL_VERSION=8.4.0" > .bazeliskrc
echo "USE_BAZEL_VERSION=8.5.0" > .bazeliskrc

- finalization:
queue: aspect-small
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15 changes: 5 additions & 10 deletions .bazelrc
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@@ -1,8 +1,7 @@
import %workspace%/bazel/defaults.bazelrc

common --enable_bzlmod

common --test_output=errors
common --incompatible_disallow_empty_glob=False

# Define value used by tests
common --define=SOME_VAR=SOME_VALUE
Expand All @@ -11,16 +10,16 @@ common --define=SOME_VAR=SOME_VALUE
common --@pypi//venv=default

common --incompatible_enable_cc_toolchain_resolution
common --@toolchains_llvm_bootstrapped//config:experimental_stub_libgcc_s
common --@rules_cc//cc/toolchains/args/archiver_flags:use_libtool_on_macos=false

# TODO(bzlmod): Don't break proto
common --per_file_copt=external/.*protobuf.*@--PROTOBUF_WAS_NOT_SUPPOSED_TO_BE_BUILT
common --host_per_file_copt=external/.*protobuf.*@--PROTOBUF_WAS_NOT_SUPPOSED_TO_BE_BUILT

# Don't try and auto detect the cc toolchain, as we use our own gcc toolchains.
# Don't try and auto detect the cc toolchain, as we use our own llvm toolchains.
common --repo_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1

# Don't link against libunwind on macos as it causes linking failures (https://github.com/bazel-contrib/toolchains_llvm/pull/346)
common:macos --@toolchains_llvm//toolchain/config:libunwind=False
common --repo_env=BAZEL_NO_APPLE_CPP_TOOLCHAIN=1

common:ci --toolchain_resolution_debug='@@bazel_tools//tools/cpp:toolchain_type'

Expand All @@ -30,10 +29,6 @@ common:release --compilation_mode=opt
common:release --@rules_rust//rust/settings:lto=fat
common:release --@rules_rust//:extra_rustc_flags=-Cpanic=abort

# Speed up local development by using the non-hermetic CPP toolchain.
common:nollvm --repo_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=0
common:nollvm --noincompatible_enable_cc_toolchain_resolution

# Load any settings specific to the current user.
# .bazelrc.user should appear in .gitignore so that settings are not shared with team members
# This needs to be last statement in this
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2 changes: 1 addition & 1 deletion .bazelversion
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@@ -1,4 +1,4 @@
8.4.0
8.5.0
# The first line of this file is used by Bazelisk and Bazel to be sure
# the right version of Bazel is used to build and test this repo.
# This also defines which version is used on CI.
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