This option controls the types of messages that are displayed by manipulating message group identifier flags or individual message numbers. Only messages with a severity of Warning or Info are controllable with this option. Messages with a severity of Error, System, Fatal, Internal, or Usage cannot be suppressed.
┌────┬──────┬─────┬────┬──────────────────────────────────────────────────┐ │Type│Global│Group│File│Default │ ├────┼──────┼─────┼────┼──────────────────────────────────────────────────┤ │P │Yes │Yes │Yes │-M:W+ (all warning messages are enabled) │ └────┴──────┴─────┴────┴──────────────────────────────────────────────────┘
All assembler messages are assigned a unique message number, and Warning or Info messages may belong to one or more message groups. The message group identifier flags are defined as follows:
ALL
Any sequence of message groups or message numbers may be specified in the argument field of the M option; each argument must be followed by a plus (+) or minus (-) character to turn the value on or off, and no intervening white space characters may appear between arguments.
See Assembler Messages for more information on message number values and the messages groups to which they belong.