[DNG] What is the meaning of this gcc warning?

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M+\Edward Bartolo
|M|Edward Bartolo
||MHendrik Boom
|MDidier Kryn
MArnt Gulbrandsen
M--+-++\Deleted
|..M.|||Deleted
|..|.||MHendrik Boom
|..M\||Deleted
|..|||MDeleted
|..||MRainer Weikusat
|..|M|Rainer Weikusat
|..|.MDidier Kryn
M+\|Deleted
|||MRainer Weikusat
||MRainer Weikusat
|MJonathan Wilkes
M\Didier Kryn
|MDeleted
MDeleted