Check googletest framework before building utests

Author: antonovalexnn

.gitmodules

@@ -10,6 +10,6 @@
 [submodule "Intel-PMT"]
 	path = Intel-PMT
 	url = https://github.com/intel/Intel-PMT.git
-[submodule "googletest"]
-	path = googletest
+[submodule "tests/googletest"]
+	path = tests/googletest
 	url = https://github.com/google/googletest.git

CMakeLists.txt

@@ -185,10 +185,6 @@ add_subdirectory(src)
 add_subdirectory(examples)
 add_subdirectory(tests)
 
-if(UNIX)
-    add_subdirectory(googletest)
-endif(UNIX)
-
 message(STATUS "Install directory: ${CMAKE_INSTALL_PREFIX}")
 
 #######################

tests/CMakeLists.txt

@@ -17,7 +17,14 @@ if(UNIX)
         target_link_libraries(urltest Threads::Threads PCM_STATIC)
     endif(LINUX)
 
-    add_subdirectory(utests)
+    if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/googletest/googletest/include/gtest/gtest.h")
+        add_subdirectory(googletest)
+        add_subdirectory(utests)
+    else()
+        message(WARNING
+            "Local googletest does not exist - unit tests will not be built.\n"
+            "If you need unit tests, please update submodules with the command: 'git submodule update --init --recursive'.\n")
+    endif()
 endif(UNIX)
 
 if(PCM_FUZZ)