Make C++ toolchain optional #3390

illicitonion · 2022-12-08T16:01:17Z

What type of PR is this?

Bug fix

What does this PR do? Why is it needed?

Currently, if you transition a go_binary, you must have a C++ toolchain
for it even if it's building in pure mode without cgo.

By making this toolchain optional, we push the error from a
toolchain-resolution-time error to an analysis-time error only if a
toolchain is both needed and not found.

This showed up in testing bazel-contrib/bazel-lib#289

achew22 · 2022-12-08T16:07:07Z

Can you also include a test to confirm we don't regress on this? Thanks!

go/private/context.bzl

fmeum · 2022-12-08T16:16:27Z

@illicitonion Is it possible that you based your commit on a rather old version of master? Rebasing should fix the CI failure.

WORKSPACE

fmeum · 2023-01-30T17:31:24Z

@illicitonion This should be unblocked as soon as Bazel 6.1 is the minimum supported version of rules_go: bazelbuild/bazel@ac47e10

illicitonion · 2023-01-31T10:52:12Z

Amazing, thanks!

LeandroLovisolo · 2023-12-21T03:29:12Z

@illicitonion This should be unblocked as soon as Bazel 6.1 is the minimum supported version of rules_go: bazelbuild/bazel@ac47e10

Bazel 6.1 has been released. Any chance this PR could be merged?

fmeum · 2023-12-21T07:06:12Z

We still support Bazel 5.4.0 though.

@illicitonion Would you be interested in picking this up again and using bazel_features for feature detection?

illicitonion · 2023-12-22T11:34:36Z

Sure, happy to pick this up again!

It looks like bazel_features requires a two-step init (http_archiveing it in, then calling a function from it), but rules_go only has a one-step init (loading go_rules_dependencies and calling it) - is there an existing pattern in rules_go for two-step init? (The problem being: You can't load the function you need to call at the top of the file because the http_archive you're loading it from doesn't exist yet, and you can't load it after the http_archive has been called because you can't load inside a function)

fmeum · 2023-12-22T13:07:15Z

@illicitonion There isn't and adding a second step would be a breaking change. How about adding this feature for Bzlmod only? Then we can look into whether we can support WORKSPACE as a follow-up.

illicitonion · 2023-12-22T17:25:48Z

@fmeum I think we're good to go on this, PTAL!

(Sorry for the horrors of the fake bazel_features :))

fmeum

Looks great, only a few stylistic comments

go/private/context.bzl

go/private/fake_bazel_features.bzl

tests/core/cross/BUILD.bazel

tests/core/starlark/cgo/cgo_test.bzl

fmeum · 2023-12-27T18:46:14Z

@linzhp Could you test this?

tyler-french

Tested these changes at Uber and everything passes

Currently, if you transition a go_binary, you must have a C++ toolchain for it even if it's building in pure mode without cgo. By making this toolchain optional, we push the error from a toolchain-resolution-time error to an analysis-time error only if a toolchain is both _needed_ and not found.

Also switch from @bazel_tools//tools/cpp:current_cc_toolchain to @bazel_tools//tools/cpp:optional_current_cc_toolchain because otherwise we still get a hard error if the toolchain can't be found.

This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [io_bazel_rules_go](https://togithub.com/bazelbuild/rules_go) | http_archive | patch | `v0.44.1` -> `v0.44.2` | --- ### Release Notes <details> <summary>bazelbuild/rules_go (io_bazel_rules_go)</summary> ### [`v0.44.2`](https://togithub.com/bazelbuild/rules_go/releases/tag/v0.44.2) [Compare Source](https://togithub.com/bazelbuild/rules_go/compare/v0.44.1...v0.44.2) #### `WORKSPACE` code load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive") http_archive( name = "io_bazel_rules_go", sha256 = "7c76d6236b28ff695aa28cf35f95de317a9472fd1fb14ac797c9bf684f09b37c", urls = [ "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.44.2/rules_go-v0.44.2.zip", "https://github.com/bazelbuild/rules_go/releases/download/v0.44.2/rules_go-v0.44.2.zip", ], ) load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies") go_rules_dependencies() go_register_toolchains(version = "1.21.5") #### What's Changed - Make C++ toolchain optional by [@illicitonion](https://togithub.com/illicitonion) in [https://github.com/bazelbuild/rules_go/pull/3390](https://togithub.com/bazelbuild/rules_go/pull/3390) - Fix a race detected only if a test times out by [@patrickmscott](https://togithub.com/patrickmscott) in [https://github.com/bazelbuild/rules_go/pull/3808](https://togithub.com/bazelbuild/rules_go/pull/3808) - registering timeout handler synchronously by [@linzhp](https://togithub.com/linzhp) in [https://github.com/bazelbuild/rules_go/pull/3810](https://togithub.com/bazelbuild/rules_go/pull/3810) - patch release 0.44.2 by [@tyler-french](https://togithub.com/tyler-french) in [https://github.com/bazelbuild/rules_go/pull/3811](https://togithub.com/bazelbuild/rules_go/pull/3811) **Full Changelog**: bazel-contrib/rules_go@v0.44.1...v0.44.2 </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox. 👻 **Immortal**: This PR will be recreated if closed unmerged. Get [config help](https://togithub.com/renovatebot/renovate/discussions) if that's undesired. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://togithub.com/renovatebot/renovate).  Co-authored-by: Self-hosted Renovate Bot <361546+cgrindel-self-hosted-renovate[bot]@users.noreply.github.enterprise.com>

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [io_bazel_rules_go](https://togithub.com/bazelbuild/rules_go) | http_archive | patch | `v0.44.1` -> `v0.44.2` | --- > [!WARNING] > Some dependencies could not be looked up. Check the Dependency Dashboard for more information. --- ### Release Notes <details> <summary>bazelbuild/rules_go (io_bazel_rules_go)</summary> ### [`v0.44.2`](https://togithub.com/bazelbuild/rules_go/releases/tag/v0.44.2) [Compare Source](https://togithub.com/bazelbuild/rules_go/compare/v0.44.1...v0.44.2) #### `WORKSPACE` code load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive") http_archive( name = "io_bazel_rules_go", sha256 = "7c76d6236b28ff695aa28cf35f95de317a9472fd1fb14ac797c9bf684f09b37c", urls = [ "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.44.2/rules_go-v0.44.2.zip", "https://github.com/bazelbuild/rules_go/releases/download/v0.44.2/rules_go-v0.44.2.zip", ], ) load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies") go_rules_dependencies() go_register_toolchains(version = "1.21.5") #### What's Changed - Make C++ toolchain optional by [@illicitonion](https://togithub.com/illicitonion) in [https://github.com/bazelbuild/rules_go/pull/3390](https://togithub.com/bazelbuild/rules_go/pull/3390) - Fix a race detected only if a test times out by [@patrickmscott](https://togithub.com/patrickmscott) in [https://github.com/bazelbuild/rules_go/pull/3808](https://togithub.com/bazelbuild/rules_go/pull/3808) - registering timeout handler synchronously by [@linzhp](https://togithub.com/linzhp) in [https://github.com/bazelbuild/rules_go/pull/3810](https://togithub.com/bazelbuild/rules_go/pull/3810) - patch release 0.44.2 by [@tyler-french](https://togithub.com/tyler-french) in [https://github.com/bazelbuild/rules_go/pull/3811](https://togithub.com/bazelbuild/rules_go/pull/3811) **Full Changelog**: bazel-contrib/rules_go@v0.44.1...v0.44.2 </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://developer.mend.io/github/ride-app/driver-service).

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [io_bazel_rules_go](https://togithub.com/bazelbuild/rules_go) | http_archive | patch | `v0.44.1` -> `v0.44.2` | --- > [!WARNING] > Some dependencies could not be looked up. Check the Dependency Dashboard for more information. --- ### Release Notes <details> <summary>bazelbuild/rules_go (io_bazel_rules_go)</summary> ### [`v0.44.2`](https://togithub.com/bazelbuild/rules_go/releases/tag/v0.44.2) [Compare Source](https://togithub.com/bazelbuild/rules_go/compare/v0.44.1...v0.44.2) #### `WORKSPACE` code load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive") http_archive( name = "io_bazel_rules_go", sha256 = "7c76d6236b28ff695aa28cf35f95de317a9472fd1fb14ac797c9bf684f09b37c", urls = [ "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.44.2/rules_go-v0.44.2.zip", "https://github.com/bazelbuild/rules_go/releases/download/v0.44.2/rules_go-v0.44.2.zip", ], ) load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies") go_rules_dependencies() go_register_toolchains(version = "1.21.5") #### What's Changed - Make C++ toolchain optional by [@illicitonion](https://togithub.com/illicitonion) in [https://github.com/bazelbuild/rules_go/pull/3390](https://togithub.com/bazelbuild/rules_go/pull/3390) - Fix a race detected only if a test times out by [@patrickmscott](https://togithub.com/patrickmscott) in [https://github.com/bazelbuild/rules_go/pull/3808](https://togithub.com/bazelbuild/rules_go/pull/3808) - registering timeout handler synchronously by [@linzhp](https://togithub.com/linzhp) in [https://github.com/bazelbuild/rules_go/pull/3810](https://togithub.com/bazelbuild/rules_go/pull/3810) - patch release 0.44.2 by [@tyler-french](https://togithub.com/tyler-french) in [https://github.com/bazelbuild/rules_go/pull/3811](https://togithub.com/bazelbuild/rules_go/pull/3811) **Full Changelog**: bazel-contrib/rules_go@v0.44.1...v0.44.2 </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://developer.mend.io/github/kreempuff/rules_unreal_engine).

This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [io_bazel_rules_go](https://togithub.com/bazelbuild/rules_go) | http_archive | patch | `v0.44.1` -> `v0.44.2` | --- ### Release Notes <details> <summary>bazelbuild/rules_go (io_bazel_rules_go)</summary> ### [`v0.44.2`](https://togithub.com/bazelbuild/rules_go/releases/tag/v0.44.2) [Compare Source](https://togithub.com/bazelbuild/rules_go/compare/v0.44.1...v0.44.2) #### `WORKSPACE` code load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive") http_archive( name = "io_bazel_rules_go", sha256 = "7c76d6236b28ff695aa28cf35f95de317a9472fd1fb14ac797c9bf684f09b37c", urls = [ "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.44.2/rules_go-v0.44.2.zip", "https://github.com/bazelbuild/rules_go/releases/download/v0.44.2/rules_go-v0.44.2.zip", ], ) load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies") go_rules_dependencies() go_register_toolchains(version = "1.21.5") #### What's Changed - Make C++ toolchain optional by [@illicitonion](https://togithub.com/illicitonion) in [https://github.com/bazelbuild/rules_go/pull/3390](https://togithub.com/bazelbuild/rules_go/pull/3390) - Fix a race detected only if a test times out by [@patrickmscott](https://togithub.com/patrickmscott) in [https://github.com/bazelbuild/rules_go/pull/3808](https://togithub.com/bazelbuild/rules_go/pull/3808) - registering timeout handler synchronously by [@linzhp](https://togithub.com/linzhp) in [https://github.com/bazelbuild/rules_go/pull/3810](https://togithub.com/bazelbuild/rules_go/pull/3810) - patch release 0.44.2 by [@tyler-french](https://togithub.com/tyler-french) in [https://github.com/bazelbuild/rules_go/pull/3811](https://togithub.com/bazelbuild/rules_go/pull/3811) **Full Changelog**: bazel-contrib/rules_go@v0.44.1...v0.44.2 </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox. 👻 **Immortal**: This PR will be recreated if closed unmerged. Get [config help](https://togithub.com/renovatebot/renovate/discussions) if that's undesired. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://togithub.com/renovatebot/renovate).  Co-authored-by: Self-hosted Renovate Bot <361546+cgrindel-self-hosted-renovate[bot]@users.noreply.github.enterprise.com>

fmeum reviewed Dec 8, 2022

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illicitonion force-pushed the optional-cpp-toolchain branch 2 times, most recently from 5da15de to 264ad0c Compare December 8, 2022 17:33

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fmeum mentioned this pull request Dec 9, 2022

Using optional C++ toolchains while maintaining compatibility with non-platform builds bazelbuild/bazel#16966

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fmeum mentioned this pull request Mar 8, 2023

rules_go requires a cc toolchain #3470

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illicitonion added 5 commits December 30, 2023 08:32

Add tests

1971a0a

Add target that actually uses cgo

59a24d2

Switch to use bazel_features

a3d516d

Also switch from @bazel_tools//tools/cpp:current_cc_toolchain to @bazel_tools//tools/cpp:optional_current_cc_toolchain because otherwise we still get a hard error if the toolchain can't be found.

Review comments

ae43602

fmeum force-pushed the optional-cpp-toolchain branch from f08151c to ae43602 Compare December 30, 2023 07:32

fmeum enabled auto-merge (squash) December 30, 2023 07:32

fmeum merged commit b5d0db5 into bazel-contrib:master Dec 30, 2023
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illicitonion deleted the optional-cpp-toolchain branch January 2, 2024 10:38

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Make C++ toolchain optional #3390

Make C++ toolchain optional #3390

illicitonion commented Dec 8, 2022

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LeandroLovisolo commented Dec 21, 2023 •

edited

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Make C++ toolchain optional #3390

Make C++ toolchain optional #3390

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