.SUFFIXES
.DEFAULT
.PRECIOUS
.IGNORE
.SILENT
If mentioned as a target with no dependencies, .SILENT says not to print any commands before executing them. This usage of .SILENT is supported only for historical compatibility. We recommend you use the more selective ways to silence specific commands. See Command echoing.
.EXPORT_ALL_VARIABLES
Any defined implicit rule suffix also counts as a special target if it appears as a target, and so does the concatenation of two suffixes, such as .c.o. These targets are suffix rules, an obsolete way of defining implicit rules (but a way still widely used). In principle, any target name could be special in this way if you break it in two and add both pieces to the suffix list. In practice, suffixes normally begin with ., so these special target names also begin with .. See Old-fashioned suffix rules.