always check git diff

CMakeLists.txt

@@ -160,13 +160,8 @@ elseif(NOT MSVC)
   set(Boost_LIBRARIES "${Boost_LIBRARIES};rt;pthread")
 endif()
 
-set(COMMIT_ID_IN_VERSION ON CACHE BOOL "Include commit ID in version")
 file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/version")
-if (NOT COMMIT_ID_IN_VERSION)
-  set(VERSION "${VERSION}-unknown")
-  configure_file("src/version.h.in" "version/version.h")
-  add_custom_target(version ALL)
-elseif(DEFINED COMMIT)
+if(DEFINED COMMIT)
   string(REPLACE "." "\\." VERSION_RE "${VERSION}")
   if(NOT REFS MATCHES "(\\(|, )tag: v${VERSION_RE}(\\)|, )")
     set(VERSION "${VERSION}-g${COMMIT}")