Use SWIFT_DRIVER_SWIFT_EXEC to pass swiftc_path to driver in bootstrap
Use SWIFT_DRIVER_SWIFT_EXEC to pass swiftc_path to driver in bootstrap

apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager