incompatible_top_level_aspects_require_providers

[mai93]

Motivation

This flag makes command-line (or top-level) aspects assess their required_providers against the top-level targets declared providers. This will make aspects behaviour on top-level targets consistent with their behaviour on the dependencies.

The incosistency without this flag causes confusion like #19609

Description

Command-line aspects will check if the declared providers in the top-level targets rule satisfies the aspect required providers. Only if this is true the aspect will apply to the target.

Incompatible Flag

incompatible_top_level_aspects_require_providers

Migration Guide

This change can be breaking if an aspect requires a provider that a rule returns but it does not declare in its definition via provides. The fix for this is to add provides = [PROVIDER] in the rule definition (example).

In which Bazel LTS version will this incompatible change be enabled?

Bazel 8

Additional Context

The flag is enabled by default in Bazel 8.0.0.

TODO List

No response