3.5.5 PIC-AS Assembler - Custom options Custom assembler options Use this field to have options not directly available in the project properties dialog passed to the assembler. See 3.4.33 Wa: Pass Option To The Assembler, Option. Custom preprocessor options Use this field to have options not directly available in the project properties dialog passed to the preprocessor. See 3.4.35 Wp: Pass Option To The Preprocessor Option.