[Buck] Emit xml stub during `buck_test_xml` target

Reviewed By: jvillard

Differential Revision: D3930854

fbshipit-source-id: 17f8035

Makefile

@@ -167,7 +167,7 @@ buck_test: infer
 
 buck_test_xml: infer
 	make direct_tests
-	buck test --xml test.xml # TODO: generate test.xml with test results
+	echo '<?xml version="1.0" ?><t/>' > test.xml # TODO: generate test.xml with test results
 	NO_BUCKD=1 ./infer/tests/build_systems/build_integration_tests.py
 
 inferTraceBugs_test: infer

infer/tests/build_systems/build_integration_tests.py

@@ -349,6 +349,7 @@ class BuildIntegrationTest(unittest.TestCase):
              ROOT_DIR,
              [{'compile': ['buck', 'build', target]}],
              clean_commands=[['buck', 'clean']],
+             enabled=(sys.platform == 'darwin'),
              available=lambda: is_tool_available(['buck', '--version']))
 
     def test_make_integration(