# Make a local copy of the substitutions.
config.substitutions = list(config.substitutions)

config.substitutions.insert(0, ('%build-irgen-test-overlays',
  '%target-swift-frontend -disable-objc-attr-requires-foundation-module -emit-module -o %t -sdk %S/Inputs %S/Inputs/ObjectiveC.swift && '
  '%target-swift-frontend -emit-module -o %t -sdk %S/Inputs %S/Inputs/Foundation.swift -I %t'))