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Command prefixes
- - - - - - - - -
Commands in both implicit and explicit rules can have prefixes that
modify how MAKE treats the commands. The following table lists the prefixes
you can use in makefiles:

Option          Description
------          -----------
@               Don't display command while it's being executed.

-<num>          Stop processing commands in the makefile when the
                exit code returned from command exceeds <num>.
                Normally, MAKE aborts if the exit code is nonzero.
                No white space is allowed between - and <num>.

-               Continue processing commands in the makefile,
                regardless of the exit code returned by them.

&               Expand either the macro $**, which represents all
                dependent files, or the macro $?, which represents
                all dependent files stamped later than the target.
                Execute the command once for each dependent file
                in the expanded macro.