Makefile中的通配符目标 [英] Wildcard targets in a Makefile

问题描述

如何压缩以下Makefile目标?

How can I compact the folllowing Makefile targets?

$(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

-

使用GNU Make 3.81.

推荐答案

该概念称为模式规则.您可以在 GNU制作手册中进行阅读.

The concept is called pattern rules. You can read about it in GNU make manual.

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

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

或者只是

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

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

---

高级内容:有趣的是，那里有重复的内容...

---

Advanced stuff: it is funny to notice that there's a repetition up there...

PNG_pattern=$(GRAPHDIR)/%.png

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

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

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