如何为目录树中某些类型的文件编写Make规则? [英] How to write a Make rule for files of certain type in a directory tree?

问题描述

想象一下包含几个Markdown文件的目录树(深度可能超过一个级别).每个文件的PDF版本都存在于同一目录中，并且每次更新相应的Markdown文件时都必须更新.要实现此目的，必须在树的根目录中的单个Makefile中编写什么规则?

Imagine a directory tree (which might be more than one level deep) containing several Markdown files. A PDF version of each file exist in the same directory and must be updated each time the corresponding Markdown file is updated. What rule must be written in a single Makefile in the root directory of this tree to achieve this?

我正在寻找一种解决方案，可以在不更新Makefile的情况下从目录树中添加或删除文件.

I am looking a for a solution where files can be added or removed from the directory tree without a need for updating the Makefile.

假设:

• 所有降价文件的名称均遵循特定模式；例如，它们以.md后缀结尾.
• 正在使用GNU Make.

推荐答案

您可以使用$(shell find)递归查找文件.例如:

You can use $(shell find) to find files recursively. For example:

markdown := $(shell find . -name '*.md')

all: $(patsubst %.md, %.pdf, $(markdown))

%.pdf: %.md
    pandoc -o $@ $<

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