Makefile规则详解

Makefile rule as follows: 

define variable   random = name    call $(random)

.PHONY:all  @declaration the False target
all:relay
@in Makefile Only run the first goal  When running a few goals, False target in the first line
$@:goal set
$<:Dependency on the first file
$^:All dependent collection
%.o:all *.o file