Move versioning info to standalone file.

Thanks to @cybik for some of the assistance.

CMakeLists.txt

@@ -46,26 +46,7 @@ endif()
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/CMake/Modules/")
 
 include("CMake/DefineOptions.cmake")
-
-# Set up version numbers according to the new scheme.
-set(SM_VERSION_MAJOR 5)
-set(SM_VERSION_MINOR 0)
-set(SM_VERSION_PATCH 8)
-set(SM_VERSION_TRADITIONAL "${SM_VERSION_MAJOR}.${SM_VERSION_MINOR}.${SM_VERSION_PATCH}")
-
-execute_process(COMMAND git rev-parse --short HEAD
-  WORKING_DIRECTORY "${SM_ROOT_DIR}"
-  OUTPUT_VARIABLE SM_VERSION_GIT_HASH
-  RESULT_VARIABLE ret
-  OUTPUT_STRIP_TRAILING_WHITESPACE
-)
-
-if(NOT (ret STREQUAL "0"))
-  set(SM_VERSION_GIT_HASH "UNKNOWN")
-  set(SM_VERSION_FULL "${SM_VERSION_MAJOR}.${SM_VERSION_MINOR}-${SM_VERSION_GIT_HASH}")
-else()
-  set(SM_VERSION_FULL "${SM_VERSION_MAJOR}.${SM_VERSION_MINOR}-git-${SM_VERSION_GIT_HASH}")
-endif()
+include("CMake/SMDefs.cmake")
 
 # Put the predefined targets in separate groups.
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)