TASKING VX-toolset for ARM User Guide

Assembly Language.UNDEFSyntax.UNDEF symbolDescriptionWith the .UNDEF directive you can undefine a substitution string that was previously defined with the.DEFINE directive. The substitution string associated with symbol is released, and symbol will no longerrepresent a valid .DEFINE substitution or macro.The assembler issues a warning if you redefine an existing symbol.The assembler does not allow a label with this directive.ExampleThe following example undefines the LEN substitution string that was previously defined with the .DEFINEdirective:.UNDEF LENRelated Information.DEFINE (Define a substitution string).MACRO,.ENDM (Define a macro)135