如何将变量从命令行传递到CMake Toolhain文件? [英] How to pass a variable from command line to a CMake Toolhain file?

查看：136 发布时间：2021/4/22 19:50:22 cmake

本文介绍了如何将变量从命令行传递到CMake Toolhain文件?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

调用cmake时是否可以将变量传递给工具链文件?

Is there a way to pass a variable to a toolchain file when invoking cmake?

例如，我有以下工具链文件:

For example, I have the following toolchain file:

message("FOO = ${FOO}")

我尝试了以下方法，但是没有用.该变量未在工具链文件中设置.

I have tried the following, but it did not work. The variable is not set in the toolchain file.

cmake <src-dir> -DCMAKE_TOOLCHAIN_FILE=<toolchain-file> -DFOO="bar" -B <build-dir>

我实际上想要实现的是将路径传递到工具链文件.而且我无法在.

What I am actually trying to achieve is passing a path to the toolchain file. And I can't modify the main CMakeLists.txt in .

您必须使用 -DCMAKE_TOOLCHAIN_FILE 设置工具链文件的路径.以下对我有用(cmake3版本3.12.0):

You have to set the path to your toolchain file with -DCMAKE_TOOLCHAIN_FILE. The following works for me (cmake3 version 3.12.0):

ToolChain.cmake:

message("Toolchain file loaded with path: ${FOO}")

CMakeLists.txt为空

CMakeLists.txt empty

cmake -DCMAKE_TOOLCHAIN_FILE=./ToolChain.cmake . -DFOO=/path

输出为:

Toolchain file loaded with path: /path

< src-path> 和 -DCMAKE_TOOLCHAIN_FILE =./ToolChain.cmake 的顺序很重要.

cmake . -DCMAKE_TOOLCHAIN_FILE=./ToolChain.cmake -DFOO=/path

不起作用.

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