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4.9 Special Built-in Target Names=================================Certain names have special meanings if they appear as targets.`.PHONY'     The prerequisites of the special target `.PHONY' are considered to     be phony targets.  When it is time to consider such a target,     `make' will run its recipe unconditionally, regardless of whether     a file with that name exists or what its last-modification time     is.  *Note Phony Targets: Phony Targets.`.SUFFIXES'     The prerequisites of the special target `.SUFFIXES' are the list     of suffixes to be used in checking for suffix rules.  *Note     Old-Fashioned Suffix Rules: Suffix Rules.`.DEFAULT'     The recipe specified for `.DEFAULT' is used for any target for     which no rules are found (either explicit rules or implicit rules).     *Note Last Resort::.  If a `.DEFAULT' recipe is specified, every     file mentioned as a prerequisite, but not as a target in a rule,     will have that recipe executed on its behalf.  *Note Implicit Rule     Search Algorithm: Implicit Rule Search.

4.9 特殊的内建目的名

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特定的名字有特殊的含义，如果他们出现在目的的位置上的话。

`.PHONY'

特殊目的 .PHONY 被认为是伪目的。当考虑这样的目的时，make 将要无条件地运行其片段，无论是否有一个同名文件存在或者此同名文件的最后修改时间如何。*Note Phony Targets: Phony Targets.

`.SUFFIXES'

特殊目的 .SUFFIXES 的前提条件是用来检查后缀规则的后缀列表。*Note Old-Fashioned Suffix Rules: Suffix Rules.

`.DEFAULT'

 为.DEFAULT 指定的片段被用于没有规则的任何目的(显式或者隐式规则)。*Note Last Resort:: 如果一个 .DEFAULT 片段被指定，任何被指定为前提条件但不是目的的，将执行此片段。*Note Implicit Rule Search Algorithm: Implicit Rule Search.

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