This option specifies the width of a tab character in blank spaces. Tab characters appearing in the source file are always expanded into blank spaces when output to the listing file; the default behavior is to expand tab characters to every eighth character position.
┌────┬──────┬─────┬────┬──────────────────────────────────────────────────┐ │Type│Global│Group│File│Default │ ├────┼──────┼─────┼────┼──────────────────────────────────────────────────┤ │P │Yes │Yes │Yes │-Lwt:8 (tab characters are 8 character positions │ │ │ │ │ │wide) │ └────┴──────┴─────┴────┴──────────────────────────────────────────────────┘