# 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'))