“ @”是否符号在包围CMake变量时有特殊含义吗？ [英] Does the "@" symbol have a special meaning when surrounding a CMake variable?

问题描述

在浏览 ITK 源代码时，我遇到了许多文件，例如此，其后缀为 .cmake.in 并定义了多个变量（字符串？），其值与变量名相同，但带有 @ 符号前置/附加。例如：

While looking through the ITK source code I've come across a number of files like this, which have the suffix .cmake.in and which define a number of variables (strings?), where the value is identical to the variable name, but with @ symbols prepended/appended. For example:

set(ExternalData_OBJECT_STORES "@ExternalData_OBJECT_STORES@")

这些声明的目的是什么？在这种情况下， @ 符号是否有特殊含义？我尝试在 CMake语言语法Wiki 中进行搜索，但是没有出现 @ 。

What is the purpose of these declarations? Does the @ symbol have a special meaning in this context? I tried searching for this in the CMake Language Syntax Wiki, but there were no occurrences of @ on the page.

推荐答案

后缀为的文件。 中的命令通常用于通过命令 configure_file 。此类文件中的所有 @NAME @ 序列都转换为变量 NAME 的值。

Files with suffix .in are usually intended for configuration via command configure_file. All sequences @NAME@ within such files are translated to value of variable NAME.

configure_file / string（CONFIGURE）之外的符号 @ 在CMake中没有特殊含义。

Outside of configure_file / string(CONFIGURE) symbol @ has no special meaning in CMake.

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