Instructs the compiler to produce a source program listing file, and optionally specifies a name for the listing file. The listing file contains numbered source program text lines. When the routine has errors, the listing file also includes an error count and information about the location and cause of errors.

When you do not specify a file name for the listing file, the compiler produces a listing file with the same name as the source file and a .LIS file extension. When the source file comes directly from SYS$INPUT, for example, your terminal, the listing file defaults to MDEFAULT.LIS.

The /LENGTH and /SPACE qualifiers modify the format and content of the listing file. The GT.M compiler ignores these qualifiers unless the command includes the /LIST qualifier.

By default, the compiler operates /NOLIST and does not produce listings.