clar: introduce CLAR_XML option

Introduce a CLAR_XML option, to run the `ctest` commands with the new
`-r` flag to clar.  Permitted values are `OFF`, `ON` and a directory to
write the XML test results to.

CMakeLists.txt

@@ -62,6 +62,8 @@ OPTION(USE_EXT_HTTP_PARSER		"Use system HTTP_Parser if available"			 ON)
 OPTION(DEBUG_POOL			"Enable debug pool allocator"				OFF)
 OPTION(ENABLE_WERROR			"Enable compilation with -Werror"			OFF)
 OPTION(USE_BUNDLED_ZLIB    		"Use the bundled version of zlib"			OFF)
+   SET(CLAR_XML 			"OFF"					       CACHE STRING
+       "Writes test results in XML format.  One of ON, OFF or the directory to write to; this does not affect the output executables, this only affects the behavior of the ctest command.")
 
 IF (UNIX AND NOT APPLE)
 	OPTION(ENABLE_REPRODUCIBLE_BUILDS "Enable reproducible builds"				OFF)

tests/CMakeLists.txt

@@ -54,8 +54,22 @@ IF (MSVC_IDE)
 	SET_SOURCE_FILES_PROPERTIES("precompiled.c" COMPILE_FLAGS "/Ycprecompiled.h")
 ENDIF ()
 
-ADD_TEST(offline   "${libgit2_BINARY_DIR}/libgit2_clar" -v -xonline)
-ADD_TEST(online    "${libgit2_BINARY_DIR}/libgit2_clar" -v -sonline)
-ADD_TEST(gitdaemon "${libgit2_BINARY_DIR}/libgit2_clar" -v -sonline::push)
-ADD_TEST(ssh       "${libgit2_BINARY_DIR}/libgit2_clar" -v -sonline::push -sonline::clone::ssh_cert -sonline::clone::ssh_with_paths)
-ADD_TEST(proxy     "${libgit2_BINARY_DIR}/libgit2_clar" -v -sonline::clone::proxy_credentials_in_url -sonline::clone::proxy_credentials_request)
+IF (CLAR_XML)
+	IF (CLAR_XML STREQUAL "ON")
+		SET(XML_PATH "")
+	ELSE ()
+		SET(XML_PATH "${CLAR_XML}/")
+	ENDIF ()
+
+	SET(TESTS_OFFLINE_XML   "-r${XML_PATH}results_offline.xml")
+	SET(TESTS_ONLINE_XML    "-r${XML_PATH}results_online.xml")
+	SET(TESTS_GITDAEMON_XML "-r${XML_PATH}results_gitdaemon.xml")
+	SET(TESTS_SSH_XML       "-r${XML_PATH}results_ssh.xml")
+	SET(TESTS_PROXY_XML     "-r${XML_PATH}results_proxy.xml")
+ENDIF ()
+
+ADD_TEST(offline   "${libgit2_BINARY_DIR}/libgit2_clar" -v ${TESTS_OFFLINE_XML} -xonline)
+ADD_TEST(online    "${libgit2_BINARY_DIR}/libgit2_clar" -v ${TESTS_ONLINE_XML} -sonline)
+ADD_TEST(gitdaemon "${libgit2_BINARY_DIR}/libgit2_clar" -v ${TESTS_GITDAEMON_XML} -sonline::push)
+ADD_TEST(ssh       "${libgit2_BINARY_DIR}/libgit2_clar" -v ${TESTS_SSH_XML} -sonline::push -sonline::clone::ssh_cert -sonline::clone::ssh_with_paths)
+ADD_TEST(proxy     "${libgit2_BINARY_DIR}/libgit2_clar" -v ${TESTS_PROXY_XML} -sonline::clone::proxy_credentials_in_url -sonline::clone::proxy_credentials_request)