WL#5665: Removal of the autotools-based build system

 - Make the cmake files depend on VERSION, causing
   cmake rerun when VERSION changes

cmake/mysql_version.cmake

@@ -21,17 +21,21 @@ SET(SHARED_LIB_MAJOR_VERSION "16")
 SET(PROTOCOL_VERSION "10")
 SET(DOT_FRM_VERSION "6")
 
+# Generate "something" to trigger cmake rerun when VERSION changes
+CONFIGURE_FILE(
+  ${CMAKE_SOURCE_DIR}/VERSION
+  ${CMAKE_BINARY_DIR}/VERSION.dep
+)
+
 # Read value for a variable from VERSION.
 
 MACRO(MYSQL_GET_CONFIG_VALUE keyword var)
  IF(NOT ${var})
-   IF (EXISTS ${CMAKE_SOURCE_DIR}/VERSION)
-     FILE (STRINGS ${CMAKE_SOURCE_DIR}/VERSION str REGEX "^[ ]*${keyword}=")
-    IF(str)
-      STRING(REPLACE "${keyword}=" "" str ${str})
-      STRING(REGEX REPLACE  "[ ].*" ""  str "${str}")
-      SET(${var} ${str})
-    ENDIF()
+   FILE (STRINGS ${CMAKE_SOURCE_DIR}/VERSION str REGEX "^[ ]*${keyword}=")
+   IF(str)
+     STRING(REPLACE "${keyword}=" "" str ${str})
+     STRING(REGEX REPLACE  "[ ].*" ""  str "${str}")
+     SET(${var} ${str})
    ENDIF()
  ENDIF()
 ENDMACRO()