将“ -D”设置为CMake中的变量 [英] Setting "-D" variables inside CMake

问题描述

我正在使用vcpkg，我想将变量 VCPKG_TARGET_TRIPLET 设置为我的特定三元组。

此处的帮助 https：//vcpkg.readthedocs .io / zh-CN / latest / users / integration /＃using-an-environment-variable-in-a-command-line-line-option （页面底部）表示您需要将其作为- CMake的D选项，但我想在CMakeLists.txt中设置它。

我尝试了以下两个选项，但两个选项似乎都不起作用：

  set（VCPKG_TARGET_TRIPLET x64-mingw-static CACHE STRING）＃不起作用
 set（VCPKG_TARGET_TRIPLET x64-mingw -static）＃也不起作用
  

我想在CMakeLists.txt中而不是命令中执行此操作的原因这行是因为我当前使用VS Code和CMakeTools扩展程序进行设置。 / p>

如何模拟我的CMakeLists中的-D标志？

我还应该提到我的整个项目已由顶层CMakeList组成，作为一种主项目，然后，该子文件夹包含带有另一个CMakeList和我的实际文件夹的子文件夹。项目（使用find_package命令的项目）。

解决方案

尝试使用 add_compile_definitions 或 target_compile_definitions

像这样

  add_compile_definitions （VCPKG_TARGET_TRIPLET = x64-mingw-static）
  

或

  target_compile_definitions（目标名称PUBLIC VCPKG_TARGET_TRIPLET = x64-mingw-static）
  

CMake教程

I am using vcpkg and I would like to set the variable VCPKG_TARGET_TRIPLET to my specific triplet.

The help here https://vcpkg.readthedocs.io/en/latest/users/integration/#using-an-environment-variable-instead-of-a-command-line-option (bottom of the page) says you need to pass it as a -D option to CMake, but I would like to set it in my CMakeLists.txt.

I have tried the following two options, but both do not seem to work:

set(VCPKG_TARGET_TRIPLET "x64-mingw-static" CACHE STRING "") # doesn't work
set(VCPKG_TARGET_TRIPLET "x64-mingw-static") # also doesn't work

The reason I want to do this in CMakeLists.txt and not the command line is because of my current setup with VS Code and the CMakeTools extension.

How can I "simulate" the -D flag inside my CMakeLists?

I should also mention that my whole "project" consists of a top-level CMakeLists as a sort of "master project" which then includes a sub-folder with another CMakeLists and my "actual" project (the one with the find_package commands).

解决方案

Try with add_compile_definitions or target_compile_definitions

Like this

add_compile_definitions(VCPKG_TARGET_TRIPLET="x64-mingw-static") 

or

target_compile_definitions(targetname PUBLIC VCPKG_TARGET_TRIPLET="x64-mingw-static")

CMake Tutorial

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