Commands associated with this target are executed if make can't find any description file entries or suffix rules with which to build a requested target.

Ignore error codes. Same as the -i option.

Files you specify for this target are not removed when you send a signal (such as interrupt) that aborts make, or when a command line in your description file returns an error.

Execute commands but do not echo them. Same as the -s option.

Suffixes associated with this target are meaningful in suffix rules. If no suffixes are listed, the existing list of suffix rules are effectively “turned off.”