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Reimplement Hilt dependency validation as a task

The Hilt Gradle Plugin validates that if applied Hilt's runtime and processor dependencies are also applied such that aggregated metadata is properly generated and not missed at the root. The validation was done during configuration time by inspecting dependencies but such strategy is not compatible with project isolation.

This commit changes the validation strategy to be done in a task that will be wired as a dependency to other common build tasks by being a 'source generating' task that doesn't actually generate any new sources. There is no Android Gradle Plugin API to hook into the compile or assemble tasks which is why addGeneratedSourceDirectory() is used.

Also add an Hilt Gradle Plugin option to disable the validation for project authors who which to disable it because it might not work well for their setup.

Fixes #4423

RELNOTES=Fix a Gradle project isolation issue in the Hilt Gradle Plugin.

@copybara-service copybara-service bot force-pushed the test_739201752 branch 4 times, most recently from 4e0dd23 to 8c74037 Compare March 26, 2025 14:43
The Hilt Gradle Plugin validates that if applied Hilt's runtime and processor dependencies are also applied such that aggregated metadata is properly generated and not missed at the root. The validation was done during configuration time by inspecting dependencies but such strategy is not compatible with project isolation.

This commit changes the validation strategy to be done in a task that will be wired as a dependency to other common build tasks by being a 'source generating' task that doesn't actually generate any new sources. There is no Android Gradle Plugin API to hook into the compile or assemble tasks which is why `addGeneratedSourceDirectory()` is used.

Also add an Hilt Gradle Plugin option to disable the validation for project authors who which to disable it because it might not work well for their setup.

Fixes #4423

RELNOTES=Fix a Gradle project isolation issue in the Hilt Gradle Plugin.
PiperOrigin-RevId: 739201752
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HiltGradlePlugin is not Gradle project isolation safe
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