cmake: Qt path verification

- check Qt path is set in order to build with a local installation
- avoid name "QT_MIN_VER" for the version used to build

Change-Id: I9bf81746ac407070a8c7efed503d4d00651f32e5

CMakeLists.txt

@@ -75,19 +75,19 @@ SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LOCAL_CMAKE_MODULE_PATH})
 
 FIND_PACKAGE(Ring REQUIRED)
 
-if(QT_MIN_VER)
-   string(REPLACE "." ";" VERSION_LIST ${QT_MIN_VER})
-   list(GET VERSION_LIST 0 QT_MIN_VER_MAJOR)
-   list(GET VERSION_LIST 1 QT_MIN_VER_MINOR)
-   list(GET VERSION_LIST 2 QT_MIN_VER_PATCH)
+if(QT5_VER AND QT5_PATH)
+   string(REPLACE "." ";" VERSION_LIST ${QT5_VER})
+   list(GET VERSION_LIST 0 QT5_VER_MAJOR)
+   list(GET VERSION_LIST 1 QT5_VER_MINOR)
+   list(GET VERSION_LIST 2 QT5_VER_PATCH)
 
-   if ((${QT_MIN_VER_MAJOR} GREATER_EQUAL 5) AND (${QT_MIN_VER_MINOR} GREATER_EQUAL 14))
+   if ((${QT5_VER_MAJOR} GREATER_EQUAL 5) AND (${QT5_VER_MINOR} GREATER_EQUAL 14))
       message(STATUS "Using custom Qt version")
-      find_package(Qt5 ${QT_MIN_VER} REQUIRED
+      find_package(Qt5 ${QT5_VER} REQUIRED
                   COMPONENTS Core DBus Sql Gui
                   PATHS ${QT5_PATH} NO_DEFAULT_PATH)
       # Linguist tools is not required.
-      find_package(Qt5 ${QT_MIN_VER}
+      find_package(Qt5 ${QT5_VER}
                   COMPONENTS LinguistTools
                   PATHS ${QT5_PATH} NO_DEFAULT_PATH)
       set(CMAKE_INSTALL_RPATH_USE_LINK_PATH true)