Not enough in RL78 RAM, could codes in startup routine be deleted?

The startup routine that is provided by default has allocated and fixed approximately 100 bytes of RAM with consideration for the amount used by the following library functions.

If the user program does not use these library functions, making the following setting with the build tool allows selection of a startup routine that does not allocate the RAM area used by these library functions.

• Relevant library functions
  Standard libraries
  brk，sbrk，malloc，calloc，realloc，free，exit，rand，srand，div，ldiv，strtok，atof，strtod，
  Mathematical functions
  Floating-point runtime library


• Build tool setting
  From the Property panel of the build tool, select "No" in [Compile Options] tab -> [Startup] -> [Use fixed area used by standard library].