Turn this flag on to produce a messages file. Using the parameterized version of the option allows the messages file to be explicitly named.
Within the context of a given assembly, by default all error, warning, and informational messages are printed to the standard output device. Use of the Fm option allows these messages to be redirected to a separate file; this can be useful when dissecting the output from multiple assemblies. Messages with a severity greater than Error are printed to the standard error device, and do not appear in the messages file.
┌────┬──────┬─────┬────┬──────────────────────────────────────────────────┐ │Type│Global│Group│File│Default │ ├────┼──────┼─────┼────┼──────────────────────────────────────────────────┤ │S │Yes │Yes │Yes │-Fm (no messages file is generated; all messages │ │ │ │ │ │are printed on the standard output) │ ├────┼──────┼─────┼────┼──────────────────────────────────────────────────┤ │P │No │No │Yes │-Fm:<MsgDIR><MsgNAME>[<MsgEXT>] │ │ │ │ │ │(A messages file name is generated using the │ │ │ │ │ │values of the referenced internal variables. The │ │ │ │ │ │MsgEXT extension is appended if this feature is │ │ │ │ │ │turned on.) │ └────┴──────┴─────┴────┴──────────────────────────────────────────────────┘