https://github.com/cgrindel/apple-toolchain-resolution-repro

Demonstrate Apple toolchain resolution issue on Linux.
https://github.com/cgrindel/apple-toolchain-resolution-repro

Last synced: 2 days ago
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Demonstrate Apple toolchain resolution issue on Linux.

• Host: GitHub
• URL: https://github.com/cgrindel/apple-toolchain-resolution-repro
• Owner: cgrindel
• Created: 2023-10-25T12:35:22.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2023-10-26T20:00:52.000Z (about 1 year ago)
• Last Synced: 2024-11-09T20:46:18.849Z (about 2 months ago)
• Language: Starlark
• Size: 5.86 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Reproduce Apple toolchain resolution issue on Linux

[Related Slack thread](https://bazelbuild.slack.com/archives/CD3QY5C2X/p1698094428238399)

This repository contains the following:

- An Objc library, `SimpleObjc`, that is marked as only being compatible with MacOS using the

  `target_compatible_with` attribute.

- A Swift binary, `PrintObjcVersion`, that depends on `SimpleObjc`.

- A Swift library, `SimpleSwift`, that has no dependencies and no `target_compatible_with` attribute

  settings.

- A Swift binary, `PrintSwiftVersion`, that depends on `SimpleSwift`.

On MacOS (Sonoma 14.0) using Xcode 15.0.1, running `bazel test //...` succeeds. On linux (Ubuntu

22.04), it fails with the following error:

```

ERROR: /home/chuck/.cache/bazel/_bazel_chuck/1356082df8f6e9e7706552f3fc65582d/external/bazel_tools/tools/cpp/BUILD:58:19: in cc_toolchain_alias rule @bazel_tools//tools/cpp:current_cc_toolchain: 

Traceback (most recent call last):

        File "/virtual_builtins_bzl/common/cc/cc_toolchain_alias.bzl", line 26, column 48, in _impl

        File "/virtual_builtins_bzl/common/cc/cc_helper.bzl", line 219, column 17, in _find_cpp_toolchain

Error in fail: Unable to find a CC toolchain using toolchain resolution. Target: @@bazel_tools//tools/cpp:current_cc_toolchain, Platform: @@apple_support~1.11.1//platforms:darwin_x86_64, Exec platform: @@loca

l_config_platform//:host

ERROR: /home/chuck/.cache/bazel/_bazel_chuck/1356082df8f6e9e7706552f3fc65582d/external/bazel_tools/tools/cpp/BUILD:58:19: Analysis of target '@bazel_tools//tools/cpp:current_cc_toolchain' failed

ERROR: Analysis of target '//Sources/PrintObjcVersion:PrintObjcVersion' failed; build aborted: Analysis failed

```

  

If you add `target_compatible_with = ["@platforms//os:macos"]` to `PrintObjcVersion`, running `bazel

test //...` will succeed on linux.

Because [transitive incompatible targets should be

skipped](https://bazel.build/reference/be/common-definitions#common.target_compatible_with), it

should not be necessary to mark `PrintObjcVersion` with the `target_compatible_with` attribute.