B.2.45 -mr[,string]

-mr removes all strings from the .comment section. When you use this flag, mcs -d -a is invoked.

-mr,string removes all strings from the .comment section and inserts string in that section of the object file. If string contains embedded blanks, it must be enclosed in quotation marks. A null string results in an empty .comment section. This option is passed as -d -astring to mcs.