Commande rm précédée d'un tiret ?

Dans un fichier makefile, il y a une commande du type:

-rm $(BINDIR)/dir_name

Que signifie le tiret devant la commande rm (remove) ?
Merci pour votre aide

bonjour,

man make:

Code:

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       Makefile command lines can have one or more of the following prefixes: a hyphen ( ’-’ ), an at sign ( ’@’ ), or a plus sign ( ’+’  ).  These  shall
       modify the way in which make processes the command. When a command is written to standard output, the prefix shall not be included in the output.
 
       -      If  the command prefix contains a hyphen, or the -i option is present, or the special target .IGNORE has either the current target as a pre-
              requisite or has no prerequisites, any error found while executing the command shall be ignored.
 
       @      If the command prefix contains an at sign and the make utility command line -n option is not specified, or the -s option is present, or  the
              special target .SILENT has either the current target as a prerequisite or has no prerequisites, the command shall not be written to standard
              output before it is executed.
 
       +      If the command prefix contains a plus sign, this indicates a makefile command line that shall be executed even if -n, -q, or  -t  is  speci-
              fied.

En gros, ça veut dire que si ça marche pô, c'est pô grave et tu peux continuer...