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

tkremenek · tkremenek · commit 0537cde15614 · 2018-11-15T21:05:56.000-08:00
diff --git a/CMakeLists.txt b/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
