How do I quickly identify the macros and copybooks required to assemble a mainframe assembler source program with z390?
• When you attempt to assembly any program with the command ASM, ASML, or ASMLG and there are missing macro or copybook references, the assembler will automatically turn on the ERRSUM option (z390 v1.3.07d or later). This option lists the missing macro and copybook names. Once all the missing files have been found by adding the necessary directory lists to SYSMAC(…) and SYSCPY(..) parms, then the option ERRSUM can be used again to list any remaining undefined symbol references which often indicate a missing macro or copybook reference or a macro library release level problem.
