Makefile中的通配符目标

Question

如何压缩以下Makefile目标？

$(GRAPHDIR)/Complex.png: $(GRAPHDIR)/Complex.dot
        dot $(GRAPHDIR)/Complex.dot -Tpng -o $(GRAPHDIR)/Complex.png

$(GRAPHDIR)/Simple.png: $(GRAPHDIR)/Simple.dot
        dot $(GRAPHDIR)/Simple.dot -Tpng -o $(GRAPHDIR)/Simple.png

$(GRAPHDIR)/IFileReader.png: $(GRAPHDIR)/IFileReader.dot
        dot $(GRAPHDIR)/IFileReader.dot -Tpng -o $(GRAPHDIR)/IFileReader.png

$(GRAPHDIR)/McCabe-linear.png: $(GRAPHDIR)/McCabe-linear.dot
        dot $(GRAPHDIR)/McCabe-linear.dot -Tpng -o $(GRAPHDIR)/McCabe-linear.png

graphs: $(GRAPHDIR)/Complex.png $(GRAPHDIR)/Simple.png $(GRAPHDIR)/IFileReader.png $(GRAPHDIR)/McCabe-linear.png

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用GNU Make 3.81.

Answer 1

这个概念称为模式规则.您可以在GNU make手册中阅读它.

$(GRAPHDIR)/%.png: $(GRAPHDIR)/%.dot
        dot $< -Tpng -o $@

graphs: $(patsubst %,$(GRAPHDIR)/%.png, Complex Simple IFileReader McCabe)\

要不就

%.png: %.dot
        dot $< -Tpng -o $@

graphs: $(patsubst %,$(GRAPHDIR)/%.png, Complex Simple IFileReader McCabe)

先进的东西:很有趣的是注意到那里有重复......

PNG_pattern=$(GRAPHDIR)/%.png

$(PNG_pattern): $(GRAPHDIR)/%.dot
        dot $< -Tpng -o $@

graphs: $(patsubst %,$(PNG_pattern), Complex Simple IFileReader McCabe)

Answer 2

以防万一你真的想为当前目录中的每个.DOT生成一个.PNG:

%.png : %.dot
    dot -Tpng -o $@ $<

all: $(addsuffix .png, $(basename $(wildcard *.dot)))

在阅读@Pavel的答案后,我想出了这个Makefile.

Answer 3

我想你想要一些模式规则.试试吧.

TARGETS = $(GRAPHDIR)/Complex.png \  
          $(GRAPHDIR)/Simple.png \ 
          $(GRAPHDIR)/IFileReader.png \
          $(GRAPHDIR)/McCabe-linear.png

%.png : %.dot
        dot $^ -Tpng -o $@

graphs: $(TARGETS)