## Why
The Windows cross-build skip used the broad `powershell` substring,
which hid unrelated Windows tests. Narrowing it exposed the same ConPTY
Ctrl-C timeout that is breaking `main`; that test is not reliable in
either cross-built or native Windows Bazel CI yet.
## What changed
- scope the cross-build PowerShell carve-out to the dedicated
parser-process test module
- exclude the exact ConPTY Ctrl-C test from Bazel CI while leaving local
Windows runs enabled
- repeat the exact exclusion in the cross-build config because it
replaces the base skip list
## Manual validation
- `just test-github-scripts`
- queried the PTY test target under both `ci-windows` and
`ci-windows-cross`
- verified the matcher excludes parser-process and ConPTY tests without
excluding unrelated PowerShell tests
- [Windows shard
4/4](https://github.com/openai/codex/actions/runs/28204844286/job/83553063859)
reproduced the `main` ConPTY timeout before the exact CI-only exclusion
was applied
We cross build when using bazel for windows. This causes a couple
hiccups in that v8 does a mksnapshot step that is expecting to snapshot
on the host arch which wasn't matching when we were doing the
crossbuild. This was causing segfault failiures when starting up
codemode from a cross built artifact.
This changes things such that we cross build the library and then run
and link a snapshot on the host machine/arch which is windows. This
gives us a functional snapshot and library that can start code-mode on
windows.
This fixes the build and then fixes two test regressions we had.
## Why
PR #25905 intentionally adds a failing `codex-core` unit test, but its
[Bazel test on Windows
check](https://github.com/openai/codex/actions/runs/26837526950/job/79135369259)
passed. That shows the Bazel configuration introduced by #25156 is not
behaving as expected, so revert it while the configuration can be
investigated separately.
## What changed
Revert #25156 in full, restoring the previous Bazel remote
configuration, CI scripts, workflows, `rusty_v8` handling, and
documentation. This removes the shared BuildBuddy wrapper and its tests.
## Validation
Not run locally; this exact revert was prioritized for a fast rollback.
## Why
Bazel remote configuration was selected in several CI scripts and
workflow steps. That made the BuildBuddy tenant policy easy to duplicate
and harder to audit, especially for fork pull requests that must not use
the OpenAI tenant.
This builds on
[sluongng/buildbuddy-ci-host-routing](https://github.com/openai/codex/compare/main...sluongng:codex:sluongng/buildbuddy-ci-host-routing)
and consolidates the policy in one place.
## What to do if this breaks you
See `codex-rs/docs/bazel.md` for details. TLDR:
1. make a BuildBuddy API key and put it in `~/.bazelrc`
2. if you're an OpenAI employee, add `common
--config=buildbuddy-openai-rbe` to `user.bazelrc` in the repo root
Run `just bazel-test` to ensure it works.
Note that `just bazel-remote-test` no longer exists, you need to select
a remote configuration as documented to use RBE.
## What changed
- Add `.github/scripts/run_bazel_with_buildbuddy.py` as the shared Bazel
wrapper and Python library. It selects the OpenAI host only for trusted
upstream GitHub Actions runs, routes keyed fork runs to the generic
host, and falls back to local Bazel execution when no key is available.
- Move endpoint selection into explicit `.bazelrc` configurations and
update Bazel CI, query helpers, and `rusty_v8` staging to use the shared
policy. Loading-phase target-discovery queries remain local.
- Add wrapper and `rusty_v8` unit coverage, plus `just test-scripts` for
the `.github/scripts` Python tests.
- Document local Bazel usage, `user.bazelrc` setup, BuildBuddy
configurations, and CI behavior in `codex-rs/docs/bazel.md`.
## Validation
- `just test-scripts`
- `bash -n .github/scripts/run-bazel-ci.sh
.github/scripts/run-bazel-query-ci.sh
.github/scripts/run-argument-comment-lint-bazel.sh
scripts/list-bazel-clippy-targets.sh`
- `python3 -m py_compile .github/scripts/run_bazel_with_buildbuddy.py
.github/scripts/test_run_bazel_with_buildbuddy.py
.github/scripts/test_rusty_v8_bazel.py
.github/scripts/rusty_v8_bazel.py`
- `ruff check .github/scripts/run_bazel_with_buildbuddy.py
.github/scripts/test_run_bazel_with_buildbuddy.py
.github/scripts/test_rusty_v8_bazel.py
.github/scripts/rusty_v8_bazel.py`
## Summary
Move the rusty_v8 artifact production into hermetic Bazel path and bump
the `v8` crate to `147.4.0`
The new flow builds V8 release artifacts from source for Darwin and
Linux targets, publishes both the current release-compatible artifacts
and sandbox-enabled variants, and keeps Cargo consumers on prebuilt
binaries by continuing to feed the `v8` crate the archive and generated
binding files it already expects.
## Why
We need control over V8 build-time features without giving up prebuilt
artifacts for downstream Cargo builds.
Upstream `rusty_v8` already supports source-only features such as
`v8_enable_sandbox`, but its normal prebuilt release assets do not cover
every feature combination we need. Building the artifacts ourselves lets
us enable settings such as the V8 sandbox and pointer compression at
artifact build time, then publish those outputs so ordinary Cargo builds
can still consume prebuilts instead of compiling V8 locally.
This keeps the fast consumer experience of prebuilt `rusty_v8` archives
while giving us a reproducible path to ship featureful variants that
upstream does not currently publish for us.
## Implementation Notes
The Bazel graph in this PR is not copied wholesale from `rusty_v8`;
`rusty_v8`'s normal source build is still GN/Ninja-based.
Instead, this change starts from upstream V8's Bazel rules and adapts
them to Codex's hermetic toolchains and dependency layout. Where we
intentionally follow `rusty_v8`, we mirror its existing artifact
contract:
- the same `v8` crate version and generated binding expectations
- the same sandbox feature relationship, where sandboxing requires
pointer compression
- the same custom libc++ model expected by Cargo's default
`use_custom_libcxx` feature
- the same release-style archive plus `src_binding` outputs consumed by
the `v8` crate
To preserve that contract, the Bazel release path pins the libc++,
libc++abi, and llvm-libc revisions used by `rusty_v8 v147.4.0`, builds
release artifacts with `--config=rusty-v8-upstream-libcxx`, and folds
the matching runtime objects into the final static archive.
## Windows
Windows is annoyingly handled differently.
Codex's current hermetic Bazel Windows C++ platform is `windows-gnullvm`
/ `x86_64-w64-windows-gnu`, while upstream `rusty_v8` publishes Windows
prebuilts for `*-pc-windows-msvc`. Those are different ABIs, so the
Bazel graph cannot truthfully reproduce the upstream MSVC artifacts
until we add a real MSVC-targeting C++ toolchain.
For now:
- Windows MSVC consumers continue to use upstream `rusty_v8` release
archives.
- Windows GNU targets are built in-tree so they link against a matching
GNU ABI.
- The canary workflow separately exercises upstream `rusty_v8` source
builds for MSVC sandbox artifacts, but MSVC is not yet part of the
Bazel-produced release matrix.
## Validation
This PR is technically self validating through CI. I have already
published it as a release tag so the artifacts from this branch are
published to
https://github.com/openai/codex/releases/tag/rusty-v8-v147.4.0 CI for
this PR should therefore consume our own release targets. I have also
locally tested for linux and darwin.
---------
Co-authored-by: Codex <noreply@openai.com>
## Summary
This is the first PR in the V8 in-process sandboxing rollout.
It adds the build-system and Rust feature plumbing needed to support
sandboxed V8 builds, then enables sandboxing by default for the
source-built Bazel V8 path that we control directly. It deliberately
keeps the published `rusty_v8` artifact workflows on their current
non-sandboxed contract so this PR can land and ship independently before
we change any released artifacts.
## Rollout plan
- [x] **PR 1: land sandbox plumbing and default source-built Bazel V8 to
sandboxed mode**
- [ ] **PR 2: publish sandbox-enabled release artifacts and add
compatibility validation**
- Produce sandboxed artifact pairs for every released Cargo target that
does not already use the source-built Bazel path.
- Add CI coverage that consumes those sandboxed artifacts and verifies:
- `codex-v8-poc` reports sandbox enabled
- `codex-code-mode` builds/tests against the sandboxed path
- [ ] **PR 3: switch release consumers to sandboxed artifacts by
default**
- Update released artifact selectors/checksums.
- Enable the Rust `v8_enable_sandbox` feature in the default release
path.
- Make the sandboxed artifact family the normal path for published
builds.
- [ ] **PR 4: remove rollout-only compatibility paths**
- Remove the temporary non-sandbox release compatibility config once the
new default has shipped and baked.
- Keep the invariant tests permanently.
## Why
Bazel CI was not actually exercising some sharded Rust integration-test
targets on macOS. The `rules_rust` sharding wrapper expects a symlink
runfiles tree, but this repo runs Bazel with `--noenable_runfiles`. In
that configuration the wrapper could fail to find the generated test
binary, produce an empty test list, and exit successfully. That made
targets such as `//codex-rs/core:core-all-test` look green even when
Cargo CI could still catch failures in the same Rust tests.
The coverage gap appears to have been introduced by
[#18082](https://github.com/openai/codex/pull/18082), which enabled
rules_rust native sharding on `//codex-rs/core:core-all-test` and the
other large Rust test labels. The manifest-runfiles setup itself
predates that change in
[#10098](https://github.com/openai/codex/pull/10098), but #18082 is
where the affected integration tests started running through the
incompatible rules_rust sharding wrapper.
[#18913](https://github.com/openai/codex/pull/18913) fixed the same
class of issue for wrapped unit-test shards, but integration-test shards
were still going through the rules_rust wrapper until this PR.
We still do not have the V8/code-mode pieces stable under the Bazel CI
cross-compile setup, so this keeps those tests out of Bazel while
restoring coverage for the rest of the sharded Rust integration suites.
Cargo CI remains responsible for V8/code-mode coverage for now.
This change did uncover a real failing core test on `main`:
`approved_folder_write_request_permissions_unblocks_later_apply_patch`.
That fix is split into
[#21060](https://github.com/openai/codex/pull/21060), which enables the
`apply_patch` tool in the test, teaches the aggregate core test binary
to dispatch the sandboxed filesystem helper, canonicalizes the macOS
temp patch target, and isolates the core test harness from managed
local/enterprise config. Keeping that fix separate lets this PR stay
focused on restoring Bazel coverage while documenting the first failure
it exposed.
## What changed
- Build sharded Rust integration tests as manual `*-bin` binaries and
run them through the existing manifest-aware `workspace_root_test`
launcher.
- Keep Bazel sharding on the launcher target so Rust test cases are
still distributed by stable test-name hashing.
- Configure Bazel CI to skip Rust tests whose names contain
`suite::code_mode::`.
- Exclude the standalone `codex-rs/code-mode` and `codex-rs/v8-poc`
unit-test targets from `bazel.yml`.
## Verification
- `bazel query --output=build //codex-rs/core:core-all-test` now shows
`workspace_root_test` wrapping `//codex-rs/core:core-all-test-bin`.
- `bazel test --test_output=all --nocache_test_results
--test_sharding_strategy=disabled //codex-rs/core:core-all-test
--test_filter=suite::request_permissions_tool::approved_folder_write_request_permissions_unblocks_later_apply_patch`
runs the actual Rust test body and passes.
- `bazel test --test_output=errors --nocache_test_results
--test_env=CODEX_BAZEL_TEST_SKIP_FILTERS=suite::code_mode::
//codex-rs/core:core-all-test` runs the sharded target with code-mode
skipped and passes overall locally, with one flaky attempt retried by
the existing `flaky = True` setting.
## Status
This is the Bazel PR-CI cross-compilation follow-up to #20485. It is
intentionally split from the Cargo/cargo-xwin release-build PoC so
#20485 can stay as the historical release-build exploration. The
unrelated async-utils test cleanup has been moved to #20686, so this PR
is focused on the Windows Bazel CI path.
The intended tradeoff is now explicit in `.github/workflows/bazel.yml`:
pull requests get the fast Windows cross-compiled Bazel test leg, while
post-merge pushes to `main` run both that fast cross leg and a fully
native Windows Bazel test leg. The native main-only job keeps full
V8/code-mode coverage and gets a 40-minute timeout because it is less
latency-sensitive than PR CI. All other Bazel jobs remain at 30 minutes.
## Why
Windows Bazel PR CI currently does the expensive part of the build on
Windows. A native Windows Bazel test job on `main` completed in about
28m12s, leaving very little headroom under the 30-minute job timeout and
making Windows the slowest PR signal.
#20485 showed that Windows cross-compilation can be materially faster
for Cargo release builds, but PR CI needs Bazel because Bazel owns our
test sharding, flaky-test retries, and integration-test layout. This PR
applies the same high-level shape we already use for macOS Bazel CI:
compile with remote Linux execution, then run platform-specific tests on
the platform runner.
The compromise is deliberately signal-aware: code-mode/V8 changes are
rare enough that PR CI can accept losing the direct V8/code-mode
smoke-test signal temporarily, while `main` still runs the native
Windows job post-merge to catch that class of regression. A follow-up PR
should investigate making the cross-built Windows gnullvm V8 archive
pass the direct V8/code-mode tests so this tradeoff can eventually go
away.
## What Changed
- Adds a `ci-windows-cross` Bazel config that targets
`x86_64-pc-windows-gnullvm`, uses Linux RBE for build actions, and keeps
`TestRunner` actions local on the Windows runner.
- Adds explicit Windows platform definitions for
`windows_x86_64_gnullvm`, `windows_x86_64_msvc`, and a bridge toolchain
that lets gnullvm test targets execute under the Windows MSVC host
platform.
- Updates the Windows Bazel PR test leg to opt into the cross-compile
path via `--windows-cross-compile` and `--remote-download-toplevel`.
- Adds a `test-windows-native-main` job that runs only for `push` events
on `refs/heads/main`, uses the native Windows Bazel path, includes
V8/code-mode smoke tests, and has `timeout-minutes: 40`.
- Keeps fork/community PRs without `BUILDBUDDY_API_KEY` on the previous
local Windows MSVC-host fallback, including
`--host_platform=//:local_windows_msvc` and `--jobs=8`.
- Preserves the existing integration-test shape on non-gnullvm
platforms, while generating Windows-cross wrapper targets only for
`windows_gnullvm`.
- Resolves `CARGO_BIN_EXE_*` values from runfiles at test runtime,
avoiding hard-coded Cargo paths and duplicate test runfiles.
- Extends the V8 Bazel patches enough for the
`x86_64-pc-windows-gnullvm` target and Linux remote execution path.
- Makes the Windows sandbox test cwd derive from `INSTA_WORKSPACE_ROOT`
at runtime when Bazel provides it, because cross-compiled binaries may
contain Linux compile-time paths.
- Keeps the direct V8/code-mode unit smoke tests out of the Windows
cross PR path for now while native Windows CI continues to cover them
post-merge.
## Command Shape
The fast Windows PR test leg invokes the normal Bazel CI wrapper like
this:
```shell
./.github/scripts/run-bazel-ci.sh \
--print-failed-action-summary \
--print-failed-test-logs \
--windows-cross-compile \
--remote-download-toplevel \
-- \
test \
--test_tag_filters=-argument-comment-lint \
--test_verbose_timeout_warnings \
--build_metadata=COMMIT_SHA=${GITHUB_SHA} \
-- \
//... \
-//third_party/v8:all \
-//codex-rs/code-mode:code-mode-unit-tests \
-//codex-rs/v8-poc:v8-poc-unit-tests
```
With the BuildBuddy secret available on Windows, the wrapper selects
`--config=ci-windows-cross` and appends the important Windows-cross
overrides after rc expansion:
```shell
--host_platform=//:rbe
--shell_executable=/bin/bash
--action_env=PATH=/usr/bin:/bin
--host_action_env=PATH=/usr/bin:/bin
--test_env=PATH=${CODEX_BAZEL_WINDOWS_PATH}
```
The native post-merge Windows job intentionally omits
`--windows-cross-compile` and does not exclude the V8/code-mode unit
targets:
```shell
./.github/scripts/run-bazel-ci.sh \
--print-failed-action-summary \
--print-failed-test-logs \
-- \
test \
--test_tag_filters=-argument-comment-lint \
--test_verbose_timeout_warnings \
--build_metadata=COMMIT_SHA=${GITHUB_SHA} \
--build_metadata=TAG_windows_native_main=true \
-- \
//... \
-//third_party/v8:all
```
## Research Notes
The existing macOS Bazel CI config already uses the model we want here:
build actions run remotely with `--strategy=remote`, but `TestRunner`
actions execute on the macOS runner. This PR mirrors that pattern for
Windows with `--strategy=TestRunner=local`.
The important Bazel detail is that `rules_rs` is already targeting
`x86_64-pc-windows-gnullvm` for Windows Bazel PR tests. This PR changes
where the build actions execute; it does not switch the Bazel PR test
target to Cargo, `cargo-nextest`, or the MSVC release target.
Cargo release builds differ from this Bazel path for V8: the normal
Windows Cargo release target is MSVC, and `rusty_v8` publishes prebuilt
Windows MSVC `.lib.gz` archives. The Bazel PR path targets
`windows-gnullvm`; `rusty_v8` does not publish a prebuilt Windows
GNU/gnullvm archive, so this PR builds that archive in-tree. That
Linux-RBE-built gnullvm archive currently crashes in direct V8/code-mode
smoke tests, which is why the workflow keeps native Windows coverage on
`main`.
The less obvious Bazel detail is test wrapper selection. Bazel chooses
the Windows test wrapper (`tw.exe`) from the test action execution
platform, not merely from the Rust target triple. The outer
`workspace_root_test` therefore declares the default test toolchain and
uses the bridge toolchain above so the test action executes on Windows
while its inner Rust binary is built for gnullvm.
The V8 investigation exposed a Windows-client gotcha: even when an
action execution platform is Linux RBE, Bazel can still derive the
genrule shell path from the Windows client. That produced remote
commands trying to run `C:\Program Files\Git\usr\bin\bash.exe` on Linux
workers. The wrapper now passes `--shell_executable=/bin/bash` with
`--host_platform=//:rbe` for the Windows cross path.
The same Windows-client/Linux-RBE boundary also affected
`third_party/v8:binding_cc`: a multiline genrule command can carry CRLF
line endings into Linux remote bash, which failed as `$'\r'`. That
genrule now keeps the `sed` command on one physical shell line while
using an explicit Starlark join so the shell arguments stay readable.
## Verification
Local checks included:
```shell
bash -n .github/scripts/run-bazel-ci.sh
bash -n workspace_root_test_launcher.sh.tpl
ruby -e "require %q{yaml}; YAML.load_file(%q{.github/workflows/bazel.yml}); puts %q{ok}"
RUNNER_OS=Linux ./scripts/list-bazel-clippy-targets.sh
RUNNER_OS=Windows ./scripts/list-bazel-clippy-targets.sh
RUNNER_OS=Linux ./tools/argument-comment-lint/list-bazel-targets.sh
RUNNER_OS=Windows ./tools/argument-comment-lint/list-bazel-targets.sh
```
The Linux clippy and argument-comment target lists contain zero
`*-windows-cross-bin` labels, while the Windows lists still include 47
Windows-cross internal test binaries.
CI evidence:
- Baseline native Windows Bazel test on `main`: success in about 28m12s,
https://github.com/openai/codex/actions/runs/25206257208/job/73907325959
- Green Windows-cross Bazel run on the split PR before adding the
main-only native leg: Windows test 9m16s, Windows release verify 5m10s,
Windows clippy 4m43s,
https://github.com/openai/codex/actions/runs/25231890068
- The latest SHA adds the explicit PR-vs-main tradeoff in `bazel.yml`;
CI is rerunning on that focused diff.
## Follow-Up
A subsequent PR should investigate making a cross-built Windows binary
work with V8/code-mode enabled. Likely options are either making the
Linux-RBE-built `windows-gnullvm` V8 archive correct at runtime, or
evaluating whether a Bazel MSVC target/toolchain can reuse the same
prebuilt MSVC `rusty_v8` archive shape that Cargo release builds already
use.
## Why
The BuildBuddy runs for PR #19086 and the later `main` build had the
same source tree, but their Windows Bazel action and test cache keys did
not line up. Comparing the downloaded execution logs showed the full
GitHub-hosted Windows runner `PATH` had changed from
`apache-maven-3.9.14` to `apache-maven-3.9.15`.
This repo is not using Maven; the Maven entry was just ambient
hosted-runner state. The problem was that Windows Bazel CI was still
forwarding the whole runner `PATH` into Bazel via `--action_env=PATH`,
`--host_action_env=PATH`, and `--test_env=PATH`, which made otherwise
reusable cache entries sensitive to unrelated runner image churn.
After discussion with the Bazel and BuildBuddy folks, the better shape
for this change was to stop asking Bazel to inherit the ambient Windows
`PATH` and instead compute one explicit cache-stable `PATH` in the
Windows setup action that already prepares the CI toolchain environment.
## What
- remove Windows `PATH` passthrough from `.bazelrc`
- export `CODEX_BAZEL_WINDOWS_PATH` from
`.github/actions/setup-bazel-ci/action.yml`
- move the PATH derivation logic into
`.github/scripts/compute-bazel-windows-path.ps1` so the allow-list is
easier to review and document
- keep only the Windows tool locations these Bazel jobs actually need:
MSVC and SDK paths, Git, PowerShell, Node, DotSlash, and the standard
Windows system directories
- update `.github/scripts/run-bazel-ci.sh` to require that explicit
value and forward it to Bazel action, host action, and test environments
- log the derived `CODEX_BAZEL_WINDOWS_PATH` in the setup step to
simplify cache-key debugging
## Verification
- `bash -n .github/scripts/run-bazel-ci.sh`
- `ruby -e 'require "yaml"; YAML.load_file(ARGV[0])'
.github/actions/setup-bazel-ci/action.yml`
- PowerShell parse check for
`.github/scripts/compute-bazel-windows-path.ps1`
- simulated a representative Windows `PATH` in PowerShell; the
allow-list retained MSVC, Git, PowerShell, Node, Windows, and DotSlash
entries while dropping Maven
## Summary
Set `RUST_MIN_STACK=8388608` for Rust test entry points so
libtest-spawned test threads get an 8 MiB stack.
The Windows BuildBuddy failure on #18893 showed
`//codex-rs/tui:tui-unit-tests` exiting with a stack overflow in a
`#[tokio::test]` even though later test binaries in the shard printed
successful summaries. Default `#[tokio::test]` uses a current-thread
Tokio runtime, which means the async test body is driven on libtest's
std-spawned test thread. Increasing the test thread stack addresses that
failure mode directly.
To date, we have been fixing these stack-pressure problems with
localized future-size reductions, such as #13429, and by adding
`Box::pin()` in specific async wrapper chains. This gives us a baseline
test-runner stack size instead of continuing to patch individual tests
only after CI finds another large async future.
## What changed
- Added `common --test_env=RUST_MIN_STACK=8388608` in `.bazelrc` so
Bazel test actions receive the env var through Bazel's cache-keyed test
environment path.
- Set the same `RUST_MIN_STACK` value for Cargo/nextest CI entry points
and `just test`.
- Annotated the existing Windows Bazel linker stack reserve as 8 MiB so
it stays aligned with the libtest thread stack size.
## Testing
- `just --list`
- parsed `.github/workflows/rust-ci.yml` and
`.github/workflows/rust-ci-full.yml` with Ruby's YAML loader
- compared `bazel aquery` `TestRunner` action keys before/after explicit
`--test_env=RUST_MIN_STACK=...` and after moving the Bazel env to
`.bazelrc`
- `bazel test //codex-rs/tui:tui-unit-tests --test_output=errors`
- failed locally on the existing sandbox-specific status snapshot
permission mismatch, but loaded the Starlark changes and ran the TUI
test shards
## What changed
This PR makes the default Cargo dev profile use line-tables-only debug
info:
```toml
[profile.dev]
debug = 1
```
That keeps useful backtraces while avoiding the cost of full variable
debug
info in normal local dev builds.
This also makes the Bazel CI setting explicit with `-Cdebuginfo=0` for
target
and exec-configuration Rust actions. Bazel/rules_rust does not read
Cargo
profiles for this setting, and the current fastbuild action already
emitted
`--codegen=debuginfo=0`; the Bazel part of this PR makes that choice
direct in
our build configuration.
## Why
The slow codex-core rebuilds are dominated by debug-info codegen, not
parsing
or type checking. On a warm-dependency package rebuild, the baseline
codex-core compile was about 39.5s wall / 38.9s rustc total, with
codegen_crate around 14.0s and LLVM_passes around 13.4s. Setting
codex-core
to line-tables-only debug info brought that to about 27.2s wall / 26.7s
rustc
total, with codegen_crate around 3.1s and LLVM_passes around 2.8s.
`debug = 0` was only about another 0.7s faster than `debug = 1` in the
codex-core measurement, so `debug = 1` is the better default dev
tradeoff: it
captures nearly all of the compile-time win while preserving basic
debuggability.
I also sampled other first-party crates instead of keeping a
codex-core-only
package override. codex-app-server showed the same pattern: rustc total
dropped from 15.85s to 10.48s, while codegen_crate plus LLVM_passes
dropped
from about 13.47s to 3.23s. codex-app-server-protocol had a smaller but
still
real improvement, 16.05s to 14.58s total, and smaller crates showed
modest
wins. That points to a workspace dev-profile policy rather than a
hand-maintained list of large crates.
## Relationship to #18612
[#18612](https://github.com/openai/codex/pull/18612) added the
`dev-small`
profile. That remains useful when someone wants a working local build
quickly
and is willing to opt in with `cargo build --profile dev-small`.
This PR is deliberately less aggressive: it changes the common default
dev
profile while preserving line tables/backtraces. `dev-small` remains the
explicit "build quickly, no debuggability concern" path.
## Other investigation
I looked for another structural win comparable to
[#16631](https://github.com/openai/codex/pull/16631) and
[#16630](https://github.com/openai/codex/pull/16630), but did not find
one.
The attempted TOML monomorphization changes were noisy or worse in
measurement, and the async task changes reduced some instantiations but
only
translated to roughly a one-second improvement while being much more
disruptive. The debug-info setting was the one repeatable, material win
that
survived measurement.
## Verification
- `just bazel-lock-update`
- `just bazel-lock-check`
- `cargo check -p codex-core --lib`
- `cargo test -p codex-core --lib`
- Bazel `aquery --config=ci-linux` confirmed `--codegen=debuginfo=0` and
`-Cdebuginfo=0` for `//codex-rs/core:core`
---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/openai/codex/pull/18844).
* #18846
* __->__ #18844
Follow-up to https://github.com/openai/codex/pull/18178, where we said
the await-holding clippy rule would be enabled separately.
Enable `await_holding_lock` and `await_holding_invalid_type` after the
preceding commits fixed or explicitly documented the current offenders.
## Why
Bazel CI had two independent Windows issues:
- The workflow saved/restored `~/.cache/bazel-repo-cache`, but
`.bazelrc` configured `common:ci-windows
--repository_cache=D:/a/.cache/bazel-repo-cache`, so `actions/cache` and
Bazel could point at different directories.
- The Windows `Bazel clippy` job passed the full explicit target list
from `//codex-rs/...`, but some of those explicit targets are
intentionally incompatible with `//:local_windows`.
`run-argument-comment-lint-bazel.sh` already handles that with
`--skip_incompatible_explicit_targets`; the clippy workflow path did
not.
I also tried switching the workflow cache path to
`D:\a\.cache\bazel-repo-cache`, but the Windows clippy job repeatedly
failed with `Failed to restore: Cache service responded with 400`, so
the final change standardizes on `$HOME/.cache/bazel-repo-cache` and
makes cache restore non-fatal.
## What Changed
- Expose one repository-cache path from
`.github/actions/setup-bazel-ci/action.yml` and export that path as
`BAZEL_REPOSITORY_CACHE` so `run-bazel-ci.sh` passes it to Bazel after
`--config=ci-*`.
- Move `actions/cache/restore` out of the composite action into
`.github/workflows/bazel.yml`, and make restore failures non-fatal
there.
- Save exactly the exported cache path in `.github/workflows/bazel.yml`.
- Remove `common:ci-windows
--repository_cache=D:/a/.cache/bazel-repo-cache` from `.bazelrc` so the
Windows CI config no longer disagrees with the workflow cache path.
- Pass `--skip_incompatible_explicit_targets` in the Windows `Bazel
clippy` job so incompatible explicit targets do not fail analysis while
the lint aspect still traverses compatible Rust dependencies.
## Verification
- Parsed `.github/actions/setup-bazel-ci/action.yml` and
`.github/workflows/bazel.yml` with Ruby's YAML loader.
- Resubmitted PR `#16740`; CI is rerunning on the amended commit.
## Why
Follow-up to #16345, the Bazel clippy rollout in #15955, and the cleanup
pass in #16353.
`cargo clippy` was enforcing the workspace deny-list from
`codex-rs/Cargo.toml` because the member crates opt into `[lints]
workspace = true`, but Bazel clippy was only using `rules_rust` plus
`clippy.toml`. That left the Bazel lane vulnerable to drift:
`clippy.toml` can tune lint behavior, but it cannot set
allow/warn/deny/forbid levels.
This PR now closes both sides of the follow-up. It keeps `.bazelrc` in
sync with `[workspace.lints.clippy]`, and it fixes the real clippy
violations that the newly-synced Windows Bazel lane surfaced once that
deny-list started matching Cargo.
## What Changed
- added `.github/scripts/verify_bazel_clippy_lints.py`, a Python check
that parses `codex-rs/Cargo.toml` with `tomllib`, reads the Bazel
`build:clippy` `clippy_flag` entries from `.bazelrc`, and reports
missing, extra, or mismatched lint levels
- ran that verifier from the lightweight `ci.yml` workflow so the sync
check does not depend on a Rust toolchain being installed first
- expanded the `.bazelrc` comment to explain the Cargo `workspace =
true` linkage and why Bazel needs the deny-list duplicated explicitly
- fixed the Windows-only `codex-windows-sandbox` violations that Bazel
clippy reported after the sync, using the same style as #16353: inline
`format!` args, method references instead of trivial closures, removed
redundant clones, and replaced SID conversion `unwrap` and `expect`
calls with proper errors
- cleaned up the remaining cross-platform violations the Bazel lane
exposed in `codex-backend-client` and `core_test_support`
## Testing
Key new test introduced by this PR:
`python3 .github/scripts/verify_bazel_clippy_lints.py`
## Why
`argument-comment-lint` had become a PR bottleneck because the repo-wide
lane was still effectively running a `cargo dylint`-style flow across
the workspace instead of reusing Bazel's Rust dependency graph. That
kept the lint enforced, but it threw away the main benefit of moving
this job under Bazel in the first place: metadata reuse and cacheable
per-target analysis in the same shape as Clippy.
This change moves the repo-wide lint onto a native Bazel Rust aspect so
Linux and macOS can lint `codex-rs` without rebuilding the world
crate-by-crate through the wrapper path.
## What Changed
- add a nightly Rust toolchain with `rustc-dev` for Bazel and a
dedicated crate-universe repo for `tools/argument-comment-lint`
- add `tools/argument-comment-lint/driver.rs` and
`tools/argument-comment-lint/lint_aspect.bzl` so Bazel can run the lint
as a custom `rustc_driver`
- switch repo-wide `just argument-comment-lint` and the Linux/macOS
`rust-ci` lanes to `bazel build --config=argument-comment-lint
//codex-rs/...`
- keep the Python/DotSlash wrappers as the package-scoped fallback path
and as the current Windows CI path
- gate the Dylint entrypoint behind a `bazel_native` feature so the
Bazel-native library avoids the `dylint_*` packaging stack
- update the aspect runtime environment so the driver can locate
`rustc_driver` correctly under remote execution
- keep the dedicated `tools/argument-comment-lint` package tests and
wrapper unit tests in CI so the source and packaged entrypoints remain
covered
## Verification
- `python3 -m unittest discover -s tools/argument-comment-lint -p
'test_*.py'`
- `cargo test` in `tools/argument-comment-lint`
- `bazel build
//tools/argument-comment-lint:argument-comment-lint-driver
--@rules_rust//rust/toolchain/channel=nightly`
- `bazel build --config=argument-comment-lint
//codex-rs/utils/path-utils:all`
- `bazel build --config=argument-comment-lint
//codex-rs/rollout:rollout`
---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/openai/codex/pull/16106).
* #16120
* __->__ #16106
## Why
This PR is the current, consolidated follow-up to the earlier Windows
Bazel attempt in #11229. The goal is no longer just to get a tiny
Windows smoke job limping along: it is to make the ordinary Bazel CI
path usable on `windows-latest` for `x86_64-pc-windows-gnullvm`, with
the same broad `//...` test shape that macOS and Linux already use.
The earlier smoke-list version of this work was useful as a foothold,
but it was not a good long-term landing point. Windows Bazel kept
surfacing real issues outside that allowlist:
- GitHub's Windows runner exposed runfiles-manifest bugs such as
`FINDSTR: Cannot open D:MANIFEST`, which broke Bazel test launchers even
when the manifest file existed.
- `rules_rs`, `rules_rust`, LLVM extraction, and Abseil still needed
`windows-gnullvm`-specific fixes for our hermetic toolchain.
- the V8 path needed more work than just turning the Windows matrix
entry back on: `rusty_v8` does not ship Windows GNU artifacts in the
same shape we need, and Bazel's in-tree V8 build needed a set of Windows
GNU portability fixes.
Windows performance pressure also pushed this toward a full solution
instead of a permanent smoke suite. During this investigation we hit
targets such as `//codex-rs/shell-command:shell-command-unit-tests` that
were much more expensive on Windows because they repeatedly spawn real
PowerShell parsers (see #16057 for one concrete example of that
pressure). That made it much more valuable to get the real Windows Bazel
path working than to keep iterating on a narrowly curated subset.
The net result is that this PR now aims for the same CI contract on
Windows that we already expect elsewhere: keep standalone
`//third_party/v8:all` out of the ordinary Bazel lane, but allow V8
consumers under `//codex-rs/...` to build and test transitively through
`//...`.
## What Changed
### CI and workflow wiring
- re-enable the `windows-latest` / `x86_64-pc-windows-gnullvm` Bazel
matrix entry in `.github/workflows/bazel.yml`
- move the Windows Bazel output root to `D:\b` and enable `git config
--global core.longpaths true` in
`.github/actions/setup-bazel-ci/action.yml`
- keep the ordinary Bazel target set on Windows aligned with macOS and
Linux by running `//...` while excluding only standalone
`//third_party/v8:all` targets from the normal lane
### Toolchain and module support for `windows-gnullvm`
- patch `rules_rs` so `windows-gnullvm` is modeled as a distinct Windows
exec/toolchain platform instead of collapsing into the generic Windows
shape
- patch `rules_rust` build-script environment handling so llvm-mingw
build-script probes do not inherit unsupported `-fstack-protector*`
flags
- patch the LLVM module archive so it extracts cleanly on Windows and
provides the MinGW libraries this toolchain needs
- patch Abseil so its thread-local identity path matches the hermetic
`windows-gnullvm` toolchain instead of taking an incompatible MinGW
pthread path
- keep both MSVC and GNU Windows targets in the generated Cargo metadata
because the current V8 release-asset story still uses MSVC-shaped names
in some places while the Bazel build targets the GNU ABI
### Windows test-launch and binary-behavior fixes
- update `workspace_root_test_launcher.bat.tpl` to read the runfiles
manifest directly instead of shelling out to `findstr`, which was the
source of the `D:MANIFEST` failures on the GitHub Windows runner
- thread a larger Windows GNU stack reserve through `defs.bzl` so
Bazel-built binaries that pull in V8 behave correctly both under normal
builds and under `bazel test`
- remove the no-longer-needed Windows bootstrap sh-toolchain override
from `.bazelrc`
### V8 / `rusty_v8` Windows GNU support
- export and apply the new Windows GNU patch set from
`patches/BUILD.bazel` / `MODULE.bazel`
- patch the V8 module/rules/source layers so the in-tree V8 build can
produce Windows GNU archives under Bazel
- teach `third_party/v8/BUILD.bazel` to build Windows GNU static
archives in-tree instead of aliasing them to the MSVC prebuilts
- reuse the Linux release binding for the experimental Windows GNU path
where `rusty_v8` does not currently publish a Windows GNU binding
artifact
## Testing
- the primary end-to-end validation for this work is the `Bazel`
workflow plus `v8-canary`, since the hard parts are Windows-specific and
depend on real GitHub runner behavior
- before consolidation back onto this PR, the same net change passed the
full Bazel matrix in [run
23675590471](https://github.com/openai/codex/actions/runs/23675590471)
and passed `v8-canary` in [run
23675590453](https://github.com/openai/codex/actions/runs/23675590453)
- those successful runs included the `windows-latest` /
`x86_64-pc-windows-gnullvm` Bazel job with the ordinary `//...` path,
not the earlier Windows smoke allowlist
---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/openai/codex/pull/15952).
* #16067
* __->__ #15952
## Why
`bazel.yml` already builds and tests the Bazel graph, but `rust-ci.yml`
still runs `cargo clippy` separately. This PR starts the transition to a
Bazel-backed lint lane for `codex-rs` so we can eventually replace the
duplicate Rust build, test, and lint work with Bazel while explicitly
keeping the V8 Bazel path out of scope for now.
To make that lane practical, the workflow also needs to look like the
Bazel job we already trust. That means sharing the common Bazel setup
and invocation logic instead of hand-copying it, and covering the arm64
macOS path in addition to Linux.
Landing the workflow green also required fixing the first lint findings
that Bazel surfaced and adding the matching local entrypoint.
## What changed
- add a reusable `build:clippy` config to `.bazelrc` and export
`codex-rs/clippy.toml` from `codex-rs/BUILD.bazel` so Bazel can run the
repository's existing Clippy policy
- add `just bazel-clippy` so the local developer entrypoint matches the
new CI lane
- extend `.github/workflows/bazel.yml` with a dedicated Bazel clippy job
for `codex-rs`, scoped to `//codex-rs/... -//codex-rs/v8-poc:all`
- run that clippy job on Linux x64 and arm64 macOS
- factor the shared Bazel workflow setup into
`.github/actions/setup-bazel-ci/action.yml` and the shared Bazel
invocation logic into `.github/scripts/run-bazel-ci.sh` so the clippy
and build/test jobs stay aligned
- fix the first Bazel-clippy findings needed to keep the lane green,
including the cross-target `cmsghdr::cmsg_len` normalization in
`codex-rs/shell-escalation/src/unix/socket.rs` and the no-`voice-input`
dead-code warnings in `codex-rs/tui` and `codex-rs/tui_app_server`
## Verification
- `just bazel-clippy`
- `RUNNER_OS=macOS ./.github/scripts/run-bazel-ci.sh -- build
--config=clippy --build_metadata=COMMIT_SHA=local-check
--build_metadata=TAG_job=clippy -- //codex-rs/...
-//codex-rs/v8-poc:all`
- `bazel build --config=clippy
//codex-rs/shell-escalation:shell-escalation`
- `CARGO_TARGET_DIR=/tmp/codex4-shell-escalation-test cargo test -p
codex-shell-escalation`
- `ruby -e 'require "yaml";
YAML.load_file(".github/workflows/bazel.yml");
YAML.load_file(".github/actions/setup-bazel-ci/action.yml")'`
## Notes
- `CARGO_TARGET_DIR=/tmp/codex4-tui-app-server-test cargo test -p
codex-tui-app-server` still hits existing guardian-approvals test and
snapshot failures unrelated to this PR's Bazel-clippy changes.
Related: #15954
Replaced ci.bazelrc and v8-ci.bazelrc by custom configs inside the main
.bazelrc file. As a result, github workflows setup is simplified down to
a single '--config=<foo>' flag usage.
Moved the build metadata flags to config=ci.
Added custom tags metadata to help differentiate invocations based on
workflow (bazel vs v8) and os (linux/macos/windows).
Enabled users to override the default values in .bazelrc by using a
user.bazelrc file locally.
Added user.bazelrc to gitignore.
This lets us drop various patches and go all the way to a very clean
setup.
In case folks are curious what was going on... we were depending on the
toolchain finding stdlib headers as sibling files of `clang++`, and for
linking we were providing a `-resource-dir` containing the runtime libs.
However, some users of the cc toolchain (such as rust build scripts) do
the equivalent of `$CC $CCFLAGS $LDFLAGS` so the `-resource-dir` was
being passed when compiling, which suppressed the default stdlib header
location logic. The upstream fix was to swap to using `-isystem` to pass
the stdlib headers, while carefully controlling the ordering to simulate
them coming from the resource-dir.
# External (non-OpenAI) Pull Request Requirements
Before opening this Pull Request, please read the dedicated
"Contributing" markdown file or your PR may be closed:
https://github.com/openai/codex/blob/main/docs/contributing.md
If your PR conforms to our contribution guidelines, replace this text
with a detailed and high quality description of your changes.
Include a link to a bug report or enhancement request.
we can't use runfiles directory on Windows due to path lengths, so swap
to manifest strategy. Parsing the manifest is a bit complex and the
format is changing in Bazel upstream, so pull in the official Rust
library (via a small hack to make it importable...) and cleanup all the
associated logic to work cleanly in both bazel and cargo without extra
confusion
On bazel9 this lets us avoid performing some external repo downloads if
they've been previously uploaded to remote cache, downloads are deferred
until they are actually needed to execute an uncached action
This PR configures Codex CLI so it can be built with
[Bazel](https://bazel.build) in addition to Cargo. The `.bazelrc`
includes configuration so that remote builds can be done using
[BuildBuddy](https://www.buildbuddy.io).
If you are familiar with Bazel, things should work as you expect, e.g.,
run `bazel test //... --keep-going` to run all the tests in the repo,
but we have also added some new aliases in the `justfile` for
convenience:
- `just bazel-test` to run tests locally
- `just bazel-remote-test` to run tests remotely (currently, the remote
build is for x86_64 Linux regardless of your host platform). Note we are
currently seeing the following test failures in the remote build, so we
still need to figure out what is happening here:
```
failures:
suite::compact::manual_compact_twice_preserves_latest_user_messages
suite::compact_resume_fork::compact_resume_after_second_compaction_preserves_history
suite::compact_resume_fork::compact_resume_and_fork_preserve_model_history_view
```
- `just build-for-release` to build release binaries for all
platforms/architectures remotely
To setup remote execution:
- [Create a buildbuddy account](https://app.buildbuddy.io/) (OpenAI
employees should also request org access at
https://openai.buildbuddy.io/join/ with their `@openai.com` email
address.)
- [Copy your API key](https://app.buildbuddy.io/docs/setup/) to
`~/.bazelrc` (add the line `build
--remote_header=x-buildbuddy-api-key=YOUR_KEY`)
- Use `--config=remote` in your `bazel` invocations (or add `common
--config=remote` to your `~/.bazelrc`, or use the `just` commands)
## CI
In terms of CI, this PR introduces `.github/workflows/bazel.yml`, which
uses Bazel to run the tests _locally_ on Mac and Linux GitHub runners
(we are working on supporting Windows, but that is not ready yet). Note
that the failures we are seeing in `just bazel-remote-test` do not occur
on these GitHub CI jobs, so everything in `.github/workflows/bazel.yml`
is green right now.
The `bazel.yml` uses extra config in `.github/workflows/ci.bazelrc` so
that macOS CI jobs build _remotely_ on Linux hosts (using the
`docker://docker.io/mbolin491/codex-bazel` Docker image declared in the
root `BUILD.bazel`) using cross-compilation to build the macOS
artifacts. Then these artifacts are downloaded locally to GitHub's macOS
runner so the tests can be executed natively. This is the relevant
config that enables this:
```
common:macos --config=remote
common:macos --strategy=remote
common:macos --strategy=TestRunner=darwin-sandbox,local
```
Because of the remote caching benefits we get from BuildBuddy, these new
CI jobs can be extremely fast! For example, consider these two jobs that
ran all the tests on Linux x86_64:
- Bazel 1m37s
https://github.com/openai/codex/actions/runs/20861063212/job/59940545209?pr=8875
- Cargo 9m20s
https://github.com/openai/codex/actions/runs/20861063192/job/59940559592?pr=8875
For now, we will continue to run both the Bazel and Cargo jobs for PRs,
but once we add support for Windows and running Clippy, we should be
able to cutover to using Bazel exclusively for PRs, which should still
speed things up considerably. We will probably continue to run the Cargo
jobs post-merge for commits that land on `main` as a sanity check.
Release builds will also continue to be done by Cargo for now.
Earlier attempt at this PR: https://github.com/openai/codex/pull/8832
Earlier attempt to add support for Buck2, now abandoned:
https://github.com/openai/codex/pull/8504
---------
Co-authored-by: David Zbarsky <dzbarsky@gmail.com>
Co-authored-by: Michael Bolin <mbolin@openai.com>
Adam Perry @ OpenAI ·
Channing Conger ·
Michael Bolin ·
Ruslan Nigmatullin ·
Son Luong Ngoc ·
zbarsky-openai ·