Syntax: /L[INENUMBERS]
This option includes source file line numbers and associated addresses in the map file. In addition, you must give LINK386 an object file (or files) with line number information. You can use the /Zd option with most compilers to include line numbers in the object file. If you give LINK386 an object file without line number information, the /L option has no effect. The option for CSET/++ is /ti.
The /L option forces LINK386 to create a map file even if you did not explicitly tell LINK386 to create a map file. By default, the file is given the same base name as the executable file, plus the extension .MAP. You can override the default name by explicitly specifying a map file name.