cmake/version: explicitly set defaults for returned variables

Author: germasch

thrust/cmake/thrust-config-version.cmake

@@ -13,14 +13,13 @@ math(EXPR THRUST_VERSION_PATCH "${THRUST_VERSION_FLAT} % 100") # Thrust: "submin
 set(THRUST_VERSION "${THRUST_VERSION_MAJOR}.${THRUST_VERSION_MINOR}.${THRUST_VERSION_PATCH}.${THRUST_VERSION_TWEAK}")
 
 set(PACKAGE_VERSION ${THRUST_VERSION})
+set(PACKAGE_VERSION_COMPATIBLE FALSE)
+set(PACKAGE_VERSION_EXACT FALSE)
+set(PACKAGE_VERSION_UNSUITABLE FALSE)
 
-if(PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION)
-  set(PACKAGE_VERSION_COMPATIBLE FALSE)
-else()
+if(PACKAGE_VERSION VERSION_GREATER_EQUAL PACKAGE_FIND_VERSION)
   if(PACKAGE_FIND_VERSION_MAJOR STREQUAL THRUST_VERSION_MAJOR)
     set(PACKAGE_VERSION_COMPATIBLE TRUE)
-  else()
-    set(PACKAGE_VERSION_COMPATIBLE FALSE)
   endif()
 
   if(PACKAGE_FIND_VERSION STREQUAL PACKAGE_VERSION)