Make:在静态模式规则中设置目标特定的变量 [英] Make: Setting target-specific variables in static pattern rules

问题描述

我正在使用静态模式规则编写Makefile，并且我希望为TARGETS的每个元素分配一个分配给当前目标名称(此处为词干'％')的变量.

I'm writing a Makefile using static pattern rules and I want for each element of TARGETS a variable assigned to the current target name (here the stem '%').

TARGETS = a b c d

all : $(TARGETS)
$(TARGETS) : % : DIR = %
$(TARGETS) : % : %_setup build

a_setup :
 code for a
b_setup :
 code for b
...
build
 code using "DIR = XX" previously configured

但是gnumake抱怨目标特定的变量DIR:

but gnumake complains about the target-specific variable DIR:

make: *** No rule to make target 'DIR', needed by 'a'

是否可以混合使用静态模式规则和变量分配?谢谢！

Is it possible to mix static pattern rules and variable assignation? Thanks!

推荐答案

根据GNU make手册，您不能那样做.但是，您可以使用$@.在您的示例中，您可以直接分配DIR=$@，但更一般地，您可以将$@与patsubst结合使用:

According to the GNU make manual you can't do it like that. However, you can use $@. In you example you can directly assign DIR=$@ but more generally you can use $@ in combination with patsubst:

TARGETS = a b c d
all : $(TARGETS)
$(TARGETS) : DIR = $(patsubst %,%,$@)
$(TARGETS) : % : %_setup build
        echo $@: DIR:$(DIR)
%_setup :
        echo $@
build:
        echo $@

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