makefile - What is the difference between %.c and *.c in GNU Make -

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what difference between %.c , *.c in makefiles. example may have:

vpath %.c    $(base_dir)platform/$(target)

and

files += $(wildcard *.c)

both include files in directory end .c take account. when use %.c , when *.c? in other words why can't use 

vpath *.c    $(base_dir)platform/$(target)

instead of 

vpath %.c    $(base_dir)platform/$(target)

?

thank you.

both % , * in gnu make wildcard functions. difference between them % can used part of text substitution function whereas * cannot.

if trying make fastest possible makefile, should try , use * wildcard function in preference % substitution function there should no resources used store name of matched item , substitute subsequent function call. if not bothered optimising make system limit, not need worry 1 choose.


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