从先决条件列表中引用目标名称 [英] Referring to the target name from the list of the prerequisites

问题描述

在Makefile中，我想从先决条件列表中引用目标名称并使用它进行构建.形式如下:

In a Makefile, I would like to refer to the target name from the list of prerequisites and to build something with it. Something of the form:

%.foo: $(addsuffix .bar, $(DATA_%))
  @echo $<

假设您有:

DATA_test = 1 2 3

当您将其称为:

make test

它将扩展为:

1.bar 2.bar 3.bar

这有可能吗?什么是解决这个问题的更好方法?

Is this somehow possible? What would be a better approach to the problem?

推荐答案

如果您的Make版本具有二次扩展，这可能会起作用(我无法对其进行测试，因为今天我能用的只是一个旧版本).

If your version of Make has secondary expansion, this will probably work (I can't test it because today all I have handy is an old version).

.SECONDEXPANSION:

%.foo: $$(addsuffix .bar, $$(DATA_$$*))
    @echo $^

没有这个，我没有比这更好的方法了:

Without that, I don't see any better way to do it than this:

define FOO_RULE
$(1).foo: $(addsuffix .bar,$(DATA_$(1)))
endef

FOO_TYPES = test real whatever

$(foreach t,$(FOO_TYPES),$(eval $(call FOO_RULE,$(t))))

%.foo:
    @echo building $@ from $^

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