[HIPIFY][cmake][tests] Refactor CUDA-related things in cmake and unit…

…-testing - Step 3

+ Fix setting of `CUDAToolkit_ROOT` and `CUDA_TOOLKIT_ROOT_DIR` if one of them is set
+ [cmake > 3.27.0] Fix setting of `CUDA_TOOLKIT_ROOT_DIR` to `CUDAToolkit_LIBRARY_ROOT` instead of erroneous `CUDAToolkit_ROOT`, which points to `include` subfolder
+ Introduced `Initial CUDA to configure` and `Found CUDA config` after the corresponding CUDA's `find_package`

CMakeLists.txt

@@ -230,6 +230,8 @@ endif() # if (NOT HIPIFY_CLANG_TESTS_ONLY)
 
 if(HIPIFY_CLANG_TESTS OR HIPIFY_CLANG_TESTS_ONLY)
 
+  message(STATUS "---- The below configuring for hipify-clang testing only ----")
+
   if(${CMAKE_VERSION} VERSION_LESS "3.27.0")
     find_package(PythonInterp 2.7 REQUIRED)
   else()
@@ -253,17 +255,17 @@ if(HIPIFY_CLANG_TESTS OR HIPIFY_CLANG_TESTS_ONLY)
   set(CUDA_DNN_ROOT_DIR OFF CACHE PATH "Path to cuDNN")
   set(CUDA_CUB_ROOT_DIR OFF CACHE PATH "Path to CUB")
 
-  if(DEFINED CUDA_TOOLKIT_ROOT_DIR)
-    if(NOT DEFINED CUDAToolkit_ROOT)
+  if(DEFINED CUDA_TOOLKIT_ROOT_DIR AND NOT CUDA_TOOLKIT_ROOT_DIR MATCHES "OFF")
+    if(NOT DEFINED CUDAToolkit_ROOT OR CUDAToolkit_ROOT MATCHES "OFF")
       set(CUDAToolkit_ROOT "${CUDA_TOOLKIT_ROOT_DIR}")
     endif()
   else()
-    if(DEFINED CUDAToolkit_ROOT)
+    if(DEFINED CUDAToolkit_ROOT AND NOT CUDAToolkit_ROOT MATCHES "OFF")
       set(CUDA_TOOLKIT_ROOT_DIR "${CUDAToolkit_ROOT}")
     endif()
   endif()
 
-  message(STATUS "CUDA config for testing:")
+  message(STATUS "Initial CUDA to configure:")
   message(STATUS "   - CUDA Toolkit path  : ${CUDA_TOOLKIT_ROOT_DIR}")
   message(STATUS "   - CUDA Samples path  : ${CUDA_SDK_ROOT_DIR}")
   message(STATUS "   - cuDNN path         : ${CUDA_DNN_ROOT_DIR}")
@@ -279,18 +281,23 @@ if(HIPIFY_CLANG_TESTS OR HIPIFY_CLANG_TESTS_ONLY)
     set(CUDA_VERSION_PATCH    "${CUDAToolkit_VERSION_PATCH}")
     set(CUDA_VERSION_FULL     "${CUDAToolkit_VERSION}")
     set(CUDA_VERSION          "${CUDAToolkit_VERSION_MAJOR}.${CUDAToolkit_VERSION_MINOR}")
-    set(CUDA_TOOLKIT_ROOT_DIR "${CUDAToolkit_ROOT}")
+    set(CUDA_TOOLKIT_ROOT_DIR "${CUDAToolkit_LIBRARY_ROOT}")
   endif()
 
   if(WIN32 AND CUDA_VERSION VERSION_LESS "11.6" AND CUDA_SDK_ROOT_DIR STREQUAL "OFF" AND NOT CUDA_TOOLKIT_ROOT_DIR MATCHES "OFF")
     set(NVCUDASAMPLES "NVCUDASAMPLES${CUDA_VERSION_MAJOR}_${CUDA_VERSION_MINOR}_ROOT")
     if(DEFINED ENV{${NVCUDASAMPLES}})
       set(CUDA_SDK_ROOT_DIR "$ENV{${NVCUDASAMPLES}}")
       string(REPLACE "\\" "/" CUDA_SDK_ROOT_DIR ${CUDA_SDK_ROOT_DIR})
-      message(STATUS "   - CUDA Samples path  : ${CUDA_SDK_ROOT_DIR}")
     endif()
   endif()
 
+  message(STATUS "Found CUDA config:")
+  message(STATUS "   - CUDA Toolkit path  : ${CUDA_TOOLKIT_ROOT_DIR}")
+  message(STATUS "   - CUDA Samples path  : ${CUDA_SDK_ROOT_DIR}")
+  message(STATUS "   - cuDNN path         : ${CUDA_DNN_ROOT_DIR}")
+  message(STATUS "   - CUB path           : ${CUDA_CUB_ROOT_DIR}")
+
   if((CUDA_VERSION VERSION_LESS "7.0") OR (LLVM_PACKAGE_VERSION VERSION_LESS "3.8") OR
      (CUDA_VERSION VERSION_GREATER "7.5" AND LLVM_PACKAGE_VERSION VERSION_LESS "4.0") OR
      (CUDA_VERSION VERSION_GREATER "8.0" AND LLVM_PACKAGE_VERSION VERSION_LESS "6.0") OR