如何在不同的CMake文件之间共享变量 [英] How to share variables between different CMake files

问题描述

如何在不同的CMake文件之间共享变量，并显示以下示例来说明我的问题：

How do I share variables between different CMake files, and I show the following examples to illustrate my question:

cmake_minimum_required(VERSION 2.6)
project(test)
set(Var3 "Global variable")

add_subdirectory(${test_SOURCE_DIR}/exe)
add_subdirectory(${test_SOURCE_DIR}/dll)

EXE文件

EXE file

set(Var1 "this is variable 1")
set(Var1 ${Var1} " added to varible 1")
message(STATUS ${Var1})

DLL文件

DLL file

set(Var2 "this is variable 2")
message(STATUS ${Var2})
message(STATUS ${Var1})
message(STATUS ${Var3})

在此示例中，Var3可以可以在 exe 和 dll 的CMake文件中看到，该文件在 Main 中定义code>。但是，在 exe 中定义的Var1在 dll 中不会被观察到。我只是好奇：有没有办法使 exe 中定义的Var1在 dll 中可见？

In this example, Var3 can be seen in the CMake files of exe and dll as it is defined in Main. However, Var1, which is defined in exe, will not be observed in dll. I was just curious: is there a way to make Var1 defined in exe observable in dll?

推荐答案

除了Tadeusz正确说的以外，还可以通过使用

Beside what Tadeusz correctly said, you can make a variable visible at any level (not just one up!) by using

set(Var1 "This is variable 1" CACHE INTERNAL "")

该变量将可用于该指令之后的所有CMake指令，因此，例如，对于在定义此变量的目录之前添加的姊妹目录，该变量将不可用

The variable will be available for all the CMake instructions that follow that instruction, so for example it won't be available for a sister directory that is added before the directory where this variable is defined.

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