[Xcode 15] GeneratedAssetSymbols in a framework or application target cause cache miss

[Bartosz Polaczyk]

My integration setup

• CocoaPods cocoapods-xcremotecache plugin
• Automatic integration using xcprepare integrate ...
• Manual integration
• Carthage

Expected/desired behavior

If a target has .xcassets, a target should still be cacheable

Minimal reproduction of the problem with instructions

• Use Xcode 15 beta 1
• run E2E standalone test
• The test will fail with an error that the final target (StandaloneApp) had a cache miss

Consumer Logs

....
** BUILD SUCCEEDED ** [3.885 sec]

reverting e2eTests/StandaloneSampleApp
rake aborted!
Failure: Unexpected misses: 1 (4). Expected 0
/Users/bartosz/Development/XCRemoteCache/tasks/e2e.rb:251:in `valide_hit_rate'

Environment

• XCRemoteCache: 0.3.24
• cocoapods-xcremotecache: 0.0.16
• HTTP cache server: local nginx
• Xcode: Version 15.0 beta (15A5160n)

Others

A feature to generate assets references (known as R.), has been added in Xcode 15:

Xcode now generates Swift and Objective-C symbols for each color and image in the asset catalog. These symbols provide a safer, more assistive way to reference assets that’s resilient to renames & typos, leverages compiler type checking, and integrates with code completion.

• In the producer's post_build phase, the generated .swift file is not listed as a dependency
• on the consumer side, an unknown input file is reported and fallbacking to the local compilation happens
• • A quick investigation shows that generating GeneratedAssetSymbols.swift and GeneratedAssetSymbols.h happens after the prebuild step so these files cannot be considered in the prebuild phase to decide if a cached artifact is reusable or not, even if we add those 2 files (GeneratedAssetSymbols.{swift|h}) to the list of dependencies