Force use of -swift-version 3 to build XCTest sources.
diff --git a/build_script.py b/build_script.py
index 334d5b4..6994f64 100755
--- a/build_script.py
+++ b/build_script.py
@@ -180,10 +180,12 @@
else:
libdispatch_args = ""
+ # NOTE: Force -swift-version 3 to build XCTest sources.
run("{swiftc} -Xcc -fblocks -c {style_options} -emit-object -emit-module "
"-module-name XCTest -module-link-name XCTest -parse-as-library "
"-emit-module-path {build_dir}/XCTest.swiftmodule "
"-force-single-frontend-invocation "
+ "-swift-version 3"
"-I {foundation_build_dir} -I {core_foundation_build_dir} "
"{libdispatch_args} "
"{source_paths} -o {build_dir}/XCTest.o".format(
