具有两个具有相同名称的目标的Makefile [英] Makefile with two targets with the same name

问题描述

我有一个包含include语句的makefile.我无法控制包含的makefile的内容.不过，我希望能够在某些"(不是全部)目标之前添加一些预处理步骤.考虑以下示例:

I have a makefile containing an include statement. I have no control over the content of the included makefile. Still, I want to be able to add some pre-processing steps before "some" (not all) of the targets. Consider the following example:

install:
      @echo "install target"

include othermakefile.mk

othermakefile.mk 也包含 install 目标.如果我运行此脚本，make会发出警告，并忽略第一个 install 目标.

othermakefile.mk contains install target as well. If I run this script, make gives a warning and ignores the first install target.

推荐答案

没有什么比这容易的了:

Nothing easier:

install: pre_install

.PHONY: pre_install
pre_install:
    do preinstallation things

include othermakefile.mk

如果要在install 或其任何先决条件之前运行pre_install，这是一种方法.这很粗糙而且很丑陋，但是确实可以做到:

If you want to run pre_install before install or any of its preqs, here is a way. It's crude and ugly, but it does the job:

install: pre_install
    $(MAKE) -f othermakefile.mk $@

.PHONY: pre_install
pre_install:
    do preinstallation things

请注意，这不一定会重建install的所有前提条件，因此其中某些前提条件可能保持其旧状态并且不能反映pre_install的影响.如果这还不够好，并且您想要在所有其他先决条件之前先pre_install，则可以添加一个选项标志:

Note that this will not necessarily rebuild all prerequisites of install, so some of them may remain in their old states and not reflect the effects of pre_install. If that's not good enough, and you want pre_install before all of the other prerequisites, you can add an option flag:

install: pre_install
    $(MAKE) --always-make -f othermakefile.mk $@

现在，Make将假定所有目标都已过时，并从头开始重建(在pre_install之后).

Now Make will assume that all targets are out of date, and rebuild from the ground up (after pre_install).

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