PHONY+=all那一排PHONY前为什么没有.PHONY，PHONY+=all是什么意思

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PHONY+=all那一排PHONY前为什么没有.PHONY，PHONY+=all是什么意思，向大家请教了


195 # but instead _all depend on modules


196 PHONY += all


197 ifeq ($(KBUILD_EXTMOD),)


198 _all: all


199 else


200 _all: modules


201 endif


202


203 ifeq ($(KBUILD_SRC),)


204        # building in the source tree


205        srctree := .


206 else


207        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))


208                # building in a subdirectory of the source tree