cmake : 从脚本设置环境变量 [英] cmake : Set environment variables from a script

问题描述

我有一个脚本可以设置交叉编译所需的所有变量.这只是其中的一部分:

I have a script that sets all variables needed for the cross-compilation. Here is just part of it :

export CONFIG_SITE=~/workspace/eldk-5.4/powerpc/site-config-powerpc-linux
export CC="powerpc-linux-gcc  -m32 -mhard-float --sysroot=~/workspace/eldk-5.4/powerpc/sysroots/powerpc-linux"
export CXX="powerpc-linux-g++  -m32 -mhard-float --sysroot=~/workspace/eldk-5.4/powerpc/sysroots/powerpc-linux"
export CPP="powerpc-linux-gcc -E  -m32 -mhard-float --sysroot=~/workspace/eldk-5.4/powerpc/sysroots/powerpc-linux"
export AS="powerpc-linux-as "
export LD="powerpc-linux-ld  --sysroot=~/workspace/eldk-5.4/powerpc/sysroots/powerpc-linux"
export GDB=powerpc-linux-gdb

如果我做source environment-setup-powerpc-linux，所有的环境变量都被导入到当前的shell session，我可以编译我的例子了.

If I do source environment-setup-powerpc-linux, all environment variables are imported into the current shell session, and I can compile my example.

是否可以在 cmake 中导入这些变量?如果是，怎么做?

Is it possible to import these variables in cmake? If yes, how?

更多细节:

1. 我正在使用 ELDK v 5.4，它的安装脚本会生成一个脚本，该脚本设置所有环境变量
2. 我找到了本教程，里面解释了如何手动设置交叉编译，但没有如何使用设置一切的脚本
3. 如果我在设置 cmake 之前调用脚本，一切正常，我可以交叉编译，但我希望 cmake 调用脚本

1. I am using ELDK v 5.4, and it's install script generates a script which sets all environment variables
2. I found this tutorial, which explains how to manually set for cross-compilation, but not how to use the script, which sets everything
3. if I call the script before setting cmake, all works fine, and I can cross-compile, but I'd like that cmake calls the script

推荐答案

通读cmake quick start，可以在命令行指定变量:

Reading through the cmake quick start, you can specify variable on a command line:

cmake -DVARIABLE1=value1 -DVARIABLE2=value2 ...

否则，cmake 脚本中的 set 命令可能就是你想要的，见 参考手册.要设置环境变量 PATH，请执行以下操作:

Otherwise, set command in the cmake script is probably what you want, see the reference manual. To set the environment variable PATH, do:

set(ENV{PATH} "/home/martink")

要设置普通变量，请执行以下操作:

To set normal variable, do:

set(variable "value")

不确定你必须设置哪些，可能是环境的.

Not sure which ones you have to set, probably the environment ones.

也就是说，在调用 cmake 之前设置环境变量 通常是解决问题的最简单的解决方案，例如:https://stackoverflow.com/a/15053460/684229

That said, setting environment variable prior to calling cmake is often the easiest solution to solve the problem, as in this case: https://stackoverflow.com/a/15053460/684229

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