| # Make a local copy of the substitutions. | |
| config.substitutions = list(config.substitutions) | |
| config.substitutions.insert(0, ('%build-silgen-test-overlays', | |
| '%target-swift-frontend(mock-sdk: -sdk %S/Inputs -I %t) -emit-module -o %t %S/Inputs/ObjectiveC.swift && ' | |
| '%target-swift-frontend(mock-sdk: -sdk %S/Inputs -I %t) -emit-module -o %t %S/Inputs/Dispatch.swift && ' | |
| '%target-swift-frontend(mock-sdk: -sdk %S/Inputs -I %t) -emit-module -o %t %S/Inputs/Foundation.swift')) |