On double colon(::) use

[kaiduan xie]

Dear expert,

I felt a littel difficulty to understand the use of double colon(::), can you explain the meaning of a Makefiel written as follows:

all::

all::debuglibs debugdepend debug optlibs optdepend opt

opt::

    @$(MAKE) DEBUG= opt

 

Thanks for help.

kaiduan xie

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