Makefile匹配任何规则作为中间 [英] Makefile match anything rule as intermediate

问题描述

考虑这个简单的Makefile:

Consider this simple Makefile:

%.one: %.two
    echo one
%.two: %.three
    echo two
%.three: %.four
    echo three

all: hi.one

按预期，全部制作将产生:

echo three
three
echo two
two
echo one
one

但是，如果我制定的中间规则没有任何前缀/后缀:

But if I make an intermediate rule without any prefix/suffix:

%.one: %
    echo one
%: %.three
    echo one
%.three: %.four
    echo one

all: hi.one

Make将失败，因为说没有规则可以使 hi.one .使用Make完全不可能吗?

Make will fail saying there is no rule to make hi.one. Is this simply impossible with Make?

推荐答案

这是不可能的，因为模式规则的依赖性，非终端匹配规则将被忽略.

No this isn't possible, non-terminal match-anything rules are ignored for dependencies of pattern rules.

这在手册中实际上没有提到，但是在make源中有以下注释(

This isn't actually mentioned in the manual, but the following comment in the make source (implicit.c:321) makes it clear

      /* Rules that can match any filename and are not terminal
         are ignored if we're recursing, so that they cannot be
         intermediate files.  */

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