cmake: rework patch version computation

Author: Mizux

cmake/utils.cmake

@@ -17,16 +17,28 @@ function(get_patch_from_git VERSION_PATCH VERSION_MAJOR)
     message(STATUS "Did not find git package.")
     set(PATCH 9999)
   else()
-    # If no tags can be found, it is a git shallow clone
+    # If no tags can be found, it is a git shallow clone or a new major
     execute_process(COMMAND
       ${GIT_EXECUTABLE} rev-list --count v${VERSION_MAJOR}.0..HEAD
       RESULT_VARIABLE RESULT_VAR
       OUTPUT_VARIABLE PATCH
       ERROR_QUIET
       WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
     if(RESULT_VAR) # since 0 is success, need invert it
-      message(STATUS "Did not be able to compute patch from v${VERSION_MAJOR}.0.")
-      set(PATCH 9999)
+      message(STATUS "Did not be able to compute patch from 'v${VERSION_MAJOR}.0'.")
+      execute_process(COMMAND
+        ${GIT_EXECUTABLE} rev-parse --is-shallow-repository
+        OUTPUT_VARIABLE IS_SHALLOW_VAR
+        ERROR_QUIET
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+      )
+      if(${IS_SHALLOW_VAR} MATCHES "false")
+        message(STATUS "Repo is not shallow, use 0 as patch.")
+        set(PATCH 0)
+      else()
+        message(STATUS "Repo is shallow, use 9999 as patch.")
+        set(PATCH 9999)
+      endif()
     endif()
     STRING(STRIP PATCH ${PATCH})
     STRING(REGEX REPLACE "\n$" "" PATCH ${PATCH})