如何将列表变量传递给另一个CMake调用？ [英] How to pass a list variable to another CMake call?

问题描述

在我的CMake脚本中，我使用 exec_program（$ {CMAKE_COMMAND} ...）运行其他CMake实例。我想将父环境的 $ {CMAKE_MODULES_PATH} 设置为子环境可用。因此，我尝试将变量作为参数传递：

In my CMake scripts, I run other CMake instances using exec_program(${CMAKE_COMMAND} ...). I want to make the ${CMAKE_MODULES_PATH} of the parent environment available to the child environments. Therefore, I tried to pass the variable as argument:

exec_program(${CMAKE_COMMAND} ... ARGS ...
    -DCMAKE_MODULE_PATH=${CMAKE_MODULE_PATH} ...)

这弄乱了其他参数，我得到 CMake错误：源目录< first-module-path>似乎不包含CMakeLists.txt。。因此，我尝试对变量进行转义：

This messes up the other parameters and I get a CMake Error: The source directory <first-module-path> does not appear to contain CMakeLists.txt.. Therefore, I tried escaping the variable:

exec_program(${CMAKE_COMMAND} ... ARGS ...
    -DCMAKE_MODULE_PATH="${CMAKE_MODULE_PATH}" ...)

当我打印 $ {CMAKE_MODULE_PATH} 形式，将打印所有路径，并以空格分隔。但是，CMake在这些路径中找不到脚本。我想这与列表以字符串而不是半彩色分隔的列表传递有关。

When I print the ${CMAKE_MODULE_PATH} form within the child environment, all the paths get printed, separated by a space each. However, CMake doesn't find scripts inside those paths. I guess it has something to do with the list being passed as string rather than a semi-color separated list.

如何传递包含字符串列表的CMake变量

How can I pass a CMake variable holding a list of strings to another CMake command?

推荐答案

在我的CMake脚本中，我使用exec_program运行其他CMake实例（ $ {CMAKE_COMMAND} ...）

In my CMake scripts, I run other CMake instances using exec_program(${CMAKE_COMMAND} ...)

根据文档不推荐使用此命令：

According to documentation this command is deprecated:

Deprecated. Use the execute_process() command instead.

带有列表变量CMakeLists.txt的示例：

Example with the list variable, CMakeLists.txt:

execute_process(
    COMMAND "${CMAKE_COMMAND}" "-DVAR=A;B;C" -P script.cmake
    OUTPUT_VARIABLE output
)

script.cmake：

script.cmake:

message("VAR: ${VAR}")

foreach(x ${VAR})
  message("x: ${x}")
endforeach()

输出：

VAR: A;B;C
x: A
x: B
x: C

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