cmake: Add submodule update option

+ Add submodule option for googletest
+ GMOCK build is disabled by default, turn on by BUILD_GMOCK=ON
+ Warning message: Gtest should not be less than 1.7.0

Signed-off-by: LUU QUANG MINH <[email protected]>

CMakeLists.txt

@@ -82,6 +82,8 @@ option(WITH_DLT_DBUS "Set to ON to build src/dbus binaries"
 option(WITH_DLT_TESTS "Set to ON to build src/test binaries"                                                         ON)
 option(WITH_DLT_UNIT_TESTS "Set to ON to build gtest framework and tests/binaries"                                   OFF)
 option(WITH_DLT_COVERAGE "Set to ON to generate coverage report for dlt-daemon source code"                          OFF)
+option(BUILD_GMOCK "Set to ON to enable gmock build"                                                                 OFF)
+option(WITH_GIT_SUBMODULE "Set to ON to update submodules during build"                                              OFF)
 option(WITH_DLT_QNX_SYSTEM "Set to ON to build QNX system binary dlt-qnx-system"                                     OFF)
 option(WITH_DLT_FILE_LOGGING_SYSLOG_FALLBACK "Set to ON to enable fallback to syslog if dlt logging to file fails"   OFF)
 option(WITH_DLT_NETWORK_TRACE "Set to ON to enable network trace (if message queue is supported)"                    ON)
@@ -211,7 +213,7 @@ if(WITH_DLT_FILE_LOGGING_SYSLOG_FALLBACK)
 endif()
 
 if(WITH_DLT_LOGSTORAGE_GZIP)
-	add_definitions(-DDLT_LOGSTORAGE_USE_GZIP)
+    add_definitions(-DDLT_LOGSTORAGE_USE_GZIP)
 endif()
 
 if(WITH_GPROF)
@@ -358,20 +360,55 @@ else()
     set(DLT_JSON_LIBRARY "")
 endif()
 
-if (WITH_DLT_LOG_LEVEL_APP_CONFIG)
+if(WITH_DLT_LOG_LEVEL_APP_CONFIG)
     add_definitions(-DDLT_LOG_LEVEL_APP_CONFIG)
 endif()
 
 add_subdirectory(doc)
 add_subdirectory(src)
 add_subdirectory(include)
 add_subdirectory(testscripts)
+
+if(WITH_GIT_SUBMODULE)
+    add_definitions(-DWITH_GIT_SUBMODULE)
+endif()
+
 if(WITH_DLT_UNIT_TESTS)
     find_package(GTest)
+    if(GTEST_FOUND)
+        find_package(PkgConfig REQUIRED)
+        execute_process(COMMAND pkg-config --modversion gtest OUTPUT_VARIABLE GTEST_VERSION)
+        string(REPLACE "\n" "" GTEST_VERSION ${GTEST_VERSION})
+        if(${GTEST_VERSION} VERSION_LESS 1.7.0)
+            message(WARNING "Please use Gtest version greater or equal to 1.7.0, or use option 'WITH_GIT_SUBMODULE' for latest version")
+        endif()
+    else()
+        message(STATUS "No Gtest package found, preparing submodule ...")
+        set(WITH_GIT_SUBMODULE ON)
+    endif()
+
+    if(WITH_GIT_SUBMODULE)
+        find_package(Git QUIET)
+        if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git")
+            message(STATUS "Submodule updating ...")
+            execute_process(COMMAND ${GIT_EXECUTABLE} submodule update --init --recursive
+                            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+                            RESULT_VARIABLE GIT_SUBMOD_RESULT)
+            if(NOT GIT_SUBMOD_RESULT EQUAL "0")
+                message(FATAL_ERROR "git submodule update --init --recursive failed with ${GIT_SUBMOD_RESULT}. Please checkout submodule")
+            endif()
+        endif()
 
-    if(NOT GTEST_FOUND)
-        add_subdirectory(googletest)
+        if(NOT EXISTS "${PROJECT_SOURCE_DIR}/googletest/CMakeLists.txt")
+            message(FATAL_ERROR "The submodule preparation failed. Please update submodule and try again!")
+        else()
+            add_subdirectory(googletest)
+            if(NOT BUILD_GMOCK)
+                add_definitions(-DBUILD_GMOCK)
+            endif()
+        endif()
     endif()
+
     enable_testing()
     add_subdirectory(tests)
 endif()
@@ -395,9 +432,14 @@ message(STATUS "WITH_DLT_FILETRANSFER = ${WITH_DLT_FILETRANSFER}")
 message(STATUS "WITH_DLT_DBUS = ${WITH_DLT_DBUS}")
 message(STATUS "WITH_DLT_TESTS = ${WITH_DLT_TESTS}")
 message(STATUS "WITH_DLT_UNIT_TESTS = ${WITH_DLT_UNIT_TESTS}")
+if(GTEST_FOUND)
+    message(STATUS "GTEST_VERSION = ${GTEST_VERSION}")
+endif()
 message(STATUS "WITH_DLT_COVERAGE = ${WITH_DLT_COVERAGE}")
 message(STATUS "WITH_DLT_SHM_ENABLE = ${WITH_DLT_SHM_ENABLE}")
 message(STATUS "WITH_DLTTEST = ${WITH_DLTTEST}")
+message(STATUS "BUILD_GMOCK = ${BUILD_GMOCK}")
+message(STATUS "WITH_GIT_SUBMODULE = ${WITH_GIT_SUBMODULE}")
 message(STATUS "WITH_DLT_PKGCONFIG = ${WITH_DLT_PKGCONFIG}")
 message(STATUS "WITH_DLT_CXX11_EXT = ${WITH_DLT_CXX11_EXT}")
 message(STATUS "WITH_DLT_COREDUMPHANDLER = ${WITH_DLT_COREDUMPHANDLER}")