CMake列表获取命令 [英] Cmake list-get command

问题描述

以下命令为什么不起作用？

Why doesn't the following command work?

SET(MY_LIST a b c d)
LIST(GET ${MY_LIST} 0 HEAD)
MESSAGE("HEAD = ${HEAD}")

I希望它将 a 分配给 HEAD ，但是我却得到了 NOTFOUND 。

I want it to assign a to HEAD but instead I'm getting NOTFOUND.

我已经尝试将 $ {MY_LIST} 括在双引号中并将索引更改为1而不是0（不知道为什么有人会这样做，但是尝试尝试并没有伤害）。

I have already tried surrounding ${MY_LIST} with double quotes and changing the index to 1 instead of 0 (don't know why someone would do that but it didn't hurt to try).

推荐答案

href = https://cmake.org/cmake/help/latest/command/list.html rel = noreferrer>列表命令需要未取代变量作为第二个参数，即：

The list commands require an unsubstituted variable as the second argument, i.e.:

set (MY_LIST a b c d)
list (GET MY_LIST 0 HEAD)
message ("HEAD = ${HEAD}") 

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