Question

我刚刚开始真正 gr清做的神经工作。然而,我不理解为什么要做以下工作:

test%: test%.foo
     @echo $@
     @echo $<

all: test1 test2

.PHONY: all test1 test2

预期行为:

$ make
test1
test1.foo
test2
test2.foo
# 1,2 Order not important

然而,我知道:

$ make
make: Nothing to be done for `all .

("make all", "make test1", etc make no difference).

谁能解释为什么执行《纽约标准规则》?

Answer 1

Excerpt from the GNU make manual.

Since it knows that phony targets do not name actual files that could be remade from other files, make skips the implicit rule search for phony targets (see section Using Implicit Rules). This is why declaring a target phony is good for performance, even if you are not worried about the actual file existing.

这意味着,作为<条码>测试1和<条码>测试2的目标,不为之寻求默示规则。即使你使用的更准确的称号为tern Rules,所有模式规则都是默示规则。

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