CMake文件在脚本模式下继承变量 [英] CMake file in script mode inheriting variables

问题描述

如何从脚本模式（-P）调用cmake文件从其他cmake文件，所以这个cmake孩子知道其父的所有变量？因为，如果我有很多变量，孩子需要，我必须写很多-D选项，我想避免它。

How can I call to a cmake file in script mode (-P) from other cmake file, so this "cmake child" knows all variable of its parent? Because, if I have a lot of variables the child needs, I have to write many -D options, and I want to avoid it.

示例：

// CMakeLists.txt
cmake_minimum_required(VERSION 2.8)

set(teststr "Hello World!")

add_custom_command(test
   ${CMAKE_COMMAND} -Dteststr=${teststr} -P test.cmake
)

// test.cmake
message("${teststr}")

$ cmake .
$ make test
Hello world!
Built target test

工作正常！但是，没有-Dteststr：

Works fine!. But, without "-Dteststr":

// CMakeLists.txt
cmake_minimum_required(VERSION 2.8)

set(teststr "Hello World!")

add_custom_command(test
   ${CMAKE_COMMAND} -P test.cmake
)

// test.cmake
message("${teststr}")

$ cmake .
$ make test

Built target test

当然，没有-D选项，test.cmake中的teststr变量未设置，因此输出为空。

Of course, without -D option, the "teststr" variable, in test.cmake, is unset, and thus, the output is empty.

调用test.cmake的任何选项遗产模式或类似的东西？

Any option to call test.cmake in "heritage mode", or something like that?

推荐答案

您可以传递参数到您调用的脚本 cmake -P 。
如果调用：

You can pass arguments to a script you call with cmake -P. If you call:

cmake -P <script-file> <arg3> <arg4> <arg5> ...

然后变量 CMAKE_ARGC CMAKE_ARGV0 ， CMAKE_ARGV1 ，...将可用于脚本。
请参阅 CMAKE_ARGC 和 CMAKE_ARGV0 。

then the variables CMAKE_ARGC, CMAKE_ARGV0, CMAKE_ARGV1, ... will be available for the script. See documentation for CMAKE_ARGC and CMAKE_ARGV0.

另一种方法是以定义变量，就像使用非脚本 cmake 命令。有一件事：你需要在 -P 之前定义变量：

The other way is to define variables, just like with the non-script cmake command. There's one thing: you need to define the variables before -P:

cmake -DVAR=VALUE -DFOO=BAR -P <script-file> <arg5> <arg6> ...

此外，脚本文件后的args编号。

Also, not that the numbering of the args after the script-file will be shifted accordingly.

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