Add feature injection

[nradakovic]

Add feature injection to toolchain gcc extension. This option will allow users to add external defined features.

resolves #45

[Copilot]

Pull request overview

Adds “feature injection” plumbing to GCC toolchain configuration so consumers can supply external cc_feature-based features (via FeatureInfo) and have them appended to the generated toolchain config.

Changes:

• Add extra_enabled_features / extra_known_features attributes to the Linux and QNX cc_toolchain_config templates and extend the toolchain features list via convert_feature(...).
• Thread the new attributes through the GCC module extension/repository rule generation (plus a small helper to stringify label lists).
• Update the examples to a newer rules_cc version and disable/remove sanitizer-related example tests.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
templates/qnx/cc_toolchain_config.bzl.template	Adds support for injecting external cc_feature features into the QNX toolchain config.
templates/linux/cc_toolchain_config.bzl.template	Adds feature injection loading + wiring, and removes previously inlined features (sanitizers/gnu11).
rules/gcc.bzl	Threads injected-feature labels into the generated Linux cc_toolchain_config(...) call.
rules/common.bzl	Adds label_list_to_string() helper used by rules/gcc.bzl.
extensions/gcc.bzl	Exposes injected-feature label lists on the module extension toolchain tag API.
examples/MODULE.bazel	Bumps rules_cc version used by the examples.
examples/MODULE.bazel.lock	Lockfile updates corresponding to the examples’ dependency bump and tag schema changes.
examples/BUILD	Comments out sanitizer-related example tests.
examples/tsan_test.cpp	Removes the TSAN repro test source.

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[Copilot]

Pull request overview

Copilot reviewed 14 out of 16 changed files in this pull request and generated 5 comments.