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gmake options

-C

The following snippets are (almost ???) identical: 
sub_target:
	cd sub_directory && $(##A(variables.html#make))

sub_target:
	$(##A(variables.html#make)) -C sub_directory
The second (as opposed to the first ???) sets the variable CURDIR.

-f

Long name: --file

-i

Long name: --ignore-errors.
Continues processing even if a command fails. See also ignoring errors in commands.

-I

Long name: --include-dir
Specifies the directories that are searched with the include directive.

-n

Long name: --just-print.
Prints the commands that make would execute in order to build the requested target without actually executing them. It also prints commands @ commands.
See also the MAKE variable.

-o file

Pretends that file has not changed although it has.

-q

See also the MAKE variable.

-s

Long name: --silent
Suppresses all echoing of commands being executed.

-t

Long name: --touch
See also the MAKE variable.

-w

Long name: --print-directory
prints 
make: Entering directory /foo/bar
and 
make: Leaving directory /foo/bar
make automatically turns on -w if -C is used, even if -s is used. In order to turn it off, use --no-print-directory.