This is just a warning message that HEW will backup the old library file before generating a new library file.
Doing the followings will make this warning message undisplayed.
Select [SuperH RISC engine Standard Toolchain...] from Options menu in the HEW.
Select [Mode] from Category in [Standard Library] tab window.
Select [Build a library file(option changed)] in Mode drop down list.
|C/C++ Compiler Package for SuperH Family|