In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

For example, you have TX_STR in the program but, for the moment, anyway, it's not used.  If you look at the compiled code (Ctrl + L) you'll see that TX_STR compiles to an empy routine -- saves space.  By using {$IFUSED name}...{$ENDIF} you can create libraries that have routines that may or may not be used.

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