Put the static libXCTest.a into a static/ subdir when building

- This simplifies linking in static libraries over shared libraries
  when using -static-stdlib during build testing.

Author: spevans

build_script.py

@@ -207,7 +207,8 @@ def build(args):
                 foundation_build_dir=foundation_build_dir))
 
         # Build the static library
-        run("ar rcs {build_dir}/libXCTest.a {build_dir}/XCTest.o".format(
+        run("mkdir -p {build_dir}/static".format(build_dir=build_dir))
+        run("ar rcs {build_dir}/static/libXCTest.a {build_dir}/XCTest.o".format(
             build_dir=build_dir))
 
         if args.test:
@@ -320,7 +321,7 @@ def install(args):
                _mkdirp(static_library_install_path)
                xctest_a = "libXCTest.a"
                run("cp {} {}".format(
-                   os.path.join(build_dir, xctest_a),
+                   os.path.join(build_dir, "static/", xctest_a),
                    os.path.join(static_library_install_path, xctest_a)))
 
     @staticmethod