make:在先决条件中使用目标特定的变量 [英] make: Using target specific variables in prerequisites

问题描述

我正在尝试编写Makefile，其中前提条件是使用目标特定变量

I'm trying to write a Makefile where prerequisites using target specific variables

version=

target1: override version=1
target1: package

target2: override version=2
target2: package

package: dir=package-${version}\
package: source

source: src/${version}.c

当我运行时，请使版本变量位于目标软件包中，并且源文件为空.

When i run make the version variable is in target package and source empty.

我做错了什么?

推荐答案

使用

UPD.

这个答案是错误的，由于 answer 中的解释原因，建议的代码无法使用问题.

UPD.

This answer is wrong, the suggested code won't work because of the reasons explained in the answer to a similar question.

TL; DR:目标特定的变量基于make正在构建的目标 [ [

TL;DR: Target-specific variables take their effect based on the target that make is currently building [1]. Second expansion, in turn, takes place right at the end of the read-in phase [2], before building anything.

感谢 @koniiiik 指出.

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