我如何获得一个makefile函数来停止当前目标? [英] How do I get a makefile function to stop the current target?

问题描述

我在makefile中有一个函数，如果文件不存在，或者至少从以下位置执行目标，我想停止整个make运行:

I have a function in a makefile that I want to stop the entire make run if a file doesn't exist, or at least the target it is executed from:

vaultfile = ./vault

$(shell test -f $(1) || exit 1)

define get_token
$(shell test -f $1 && cat $1 || exit 2)
endef

a: token = $(call get_token,$(vaultfile),tokenname)
a:
        echo ==== $(token)
.PHONY=a

以上操作无效，文件丢失时会自动失败

The above doesn't work, silently failing when the file is missing

$ rm vault
$ make
echo ==== 
====
$ echo f > vault
$ make
echo ==== f
==== f

我希望将其包含在函数中，因为大多数目标都不会调用该函数(这显然会执行更多的IRL).

I want this to be in the function, because most targets do not call the function (which obviously does more IRL).

我如何进行这项工作?

推荐答案

谢谢您 MadScientist ！

我最终得到的简化版本是:(格式化为易于阅读)

The simplified version of what I ended up with is: (formatted for easier readability)

vaultfile = ./vault

define get_token
$(shell \
$(if $(wildcard $1), \
echo "Decoded $1" \
, \
$(error File $1 does not exist)
)
)
endef

a: token = $(call get_token,$(vaultfile))
a:
        echo ==== $(token)

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