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如何在CMake命令行中从CMakeLists.txt覆盖默认变量？

[英]How can i override a default variable from CMakeLists.txt on CMake command line?

 原文  2019-05-17 17:31:27  0   1    cmake

问题描述

I have a .cmake file containing default values for variables. 我有一个.cmake文件，其中包含变量的默认值。 The .cmake file is called from CMakeLists.txt using 'include'. .cmake文件使用'include'从CMakeLists.txt中调用。 One of the variables is a version number. 变量之一是版本号。 What is the best practice or setup to overrule that variable version number from CMake command line? 什么是从CMake命令行否决该可变版本号的最佳实践或设置？

In gnu make you could use var ?= value where you can set var value on make command line. 在gnu make中，您可以使用var？= value，您可以在make命令行上设置var值。 I do not see something similar in C-Make. 我在C-Make中看不到类似的东西。

1 个解决方案

解决方案1
 1  2019-05-17 17:37:28

For boolean values, you can use option : 对于布尔值，可以使用option ： 

option(CUSTOMIZABLE_VAR "This variable do stuff" "default-value")

Also GUI apps exposing options such as CMake GUI or QtCreator you'll get a the description and a field to edit it. 此外，GUI应用程序还公开了诸如CMake GUI或QtCreator之类的选项，您将获得说明和可对其进行编辑的字段。

For value of type string, you can set a cache value with a help string: 对于字符串类型的值，可以使用帮助字符串设置缓存值： 

set(CUSTOMIZABLE_VAR "8" CACHE STRING "This option is a string")

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