Merge pull request #238 from tkremenek/force-swift-4

Force corelibs-xctest to build with -swift-version 4

Author: tkremenek

CMakeLists.txt

@@ -83,6 +83,7 @@ add_swift_library(XCTest
                     Sources/XCTest/Public/Asynchronous/XCTestExpectation.swift
                   SWIFT_FLAGS
                     ${swift_optimization_flags}
+                    -swift-version 4
 
                     -I${XCTEST_PATH_TO_LIBDISPATCH_SOURCE}
                     -I${XCTEST_PATH_TO_LIBDISPATCH_BUILD}/src/swift