Add guardrail against Bazel legacy C++ feature regressions#102
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Pull request overview
Adds an analysis-driven Bazel test guardrail to prevent regression back to Bazel’s implicit legacy C/C++ feature behavior, and wires it into CI plus documentation so regressions are detected deterministically across supported --configs.
Changes:
- Introduces
no_legacy_features_guard_test(Starlark test rule) to assert theno_legacy_featurescontract and detect re-enabled Bazel legacy features. - Adds a
guardrail_testssuite and runs it in platform CI workflows. - Documents the new guardrail and test workspace structure.
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Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| tests/guardrails/README.md | Documents what the guardrail checks, how to run it, and how to interpret failures. |
| tests/guardrails/legacy_feature_guard.bzl | Implements the analysis-driven guardrail test rule that resolves the active C++ toolchain and checks the explicit-feature contract. |
| tests/guardrails/BUILD | Declares the no_legacy_features_guard_test target in the guardrails package. |
| tests/BUILD | Adds guardrail_tests test suite aggregating the new guardrail target. |
| docs/tests_and_validation.md | Documents the new tests/guardrails/ area and links to interpretation guidance. |
| .github/workflows/x86_64-linux.yml | Runs the new guardrail suite in the x86_64 Linux CI workflow. |
| .github/workflows/autosd.yml | Runs the new guardrail suite in the AutoSD CI workflow. |
| .github/workflows/aarch64-linux.yml | Runs the new guardrail suite in the aarch64 Linux CI workflow. |
| .github/workflows/aarch64-ebclfsa.yml | Runs the new guardrail suite in the EBcLfSA CI workflow. |
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Add no_legacy_features_guard_test, an analysis-driven test rule under tests/guardrails/ that resolves the active C++ toolchain and fails as a test if the explicit-feature contract regresses -- i.e. the no_legacy_features marker is no longer enabled or a Bazel implicit legacy feature (legacy_compile_flags, legacy_link_flags, sysroot) becomes active again. The verdict is deterministic and surfaced via the test's exit status, so it needs no target hardware and runs on any --config. Wire the new guardrail_tests suite into every platform CI workflow and document what it validates and how to interpret failures in tests/guardrails/README.md and docs/tests_and_validation.md. resolves #82
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Add no_legacy_features_guard_test, an analysis-driven test rule under tests/guardrails/ that resolves the active C++ toolchain and fails as a test if the explicit-feature contract regresses -- i.e. the no_legacy_features marker is no longer enabled or a Bazel implicit legacy feature (legacy_compile_flags, legacy_link_flags, sysroot) becomes active again. The verdict is deterministic and surfaced via the test's exit status, so it needs no target hardware and runs on any --config.
Wire the new guardrail_tests suite into every platform CI workflow and document what it validates and how to interpret failures in tests/guardrails/README.md and docs/tests_and_validation.md.
resolves #82