CMake似乎忽略了CMAKE_OSX_DEPLOYMENT_TARGET [英] CMake seems to ignore CMAKE_OSX_DEPLOYMENT_TARGET

问题描述

我在OS X 10.10.5上使用CMake 3.3.2和Xcode 7.1。

I'm using CMake 3.3.2 and Xcode 7.1 on OS X 10.10.5.

我有一个使用CMake的小型C ++项目。我希望它在OS X 10.9或更高版本上运行。因此，我修改了CMakeLists.txt以开始以下操作：

I have a small C++ project that uses CMake. I want it to run on OS X 10.9 or later. So I modified my CMakeLists.txt to look start this:

cmake_minimum_required(VERSION 3.3)
set(CMAKE_OSX_DEPLOYMENT_TARGET "10.9")

project(...

然后我创建了Xcode项目像这样：

Then I create the Xcode project like this:

cmake -G Xcode <path>

但是，生成的xcodeproj捆绑包似乎没有设置部署目标。当我在文本编辑器中打开所包含的project.pbxproj文件时，没有任何行提及 MACOSX_DEPLOYMENT_TARGET 。

However, the resulting xcodeproj bundle doesn't seem to have a deployment target set. When I open the contained project.pbxproj file in a text editor, there is no line mentioning MACOSX_DEPLOYMENT_TARGET.

因此，当我在Xcode中打开项目设置>部署> OS X部署目标下的项目时，无论我在CMakeLists.txt中指定什么，Xcode始终显示默认值 OS X 10.11。在Xcode中手动更改设置然后在文本编辑器中重新打开项目文件时，行 MACOSX_DEPLOYMENT_TARGET = 10.9; 已正确添加。

Accordingly, when I open the project in Xcode, under Build Settings > Deployment > OS X Deployment Target, Xcode always displays the default value "OS X 10.11", no matter what I specify in CMakeLists.txt. When I manually change the setting in Xcode and then re-open the project file in a text editor, the line MACOSX_DEPLOYMENT_TARGET = 10.9; has correctly been added.

我在做什么吗？错了吗？谷歌搜索问题没有得到任何最新结果。

Am I doing something wrong? Googling the problem didn't give any recent results.

推荐答案

变量 CMAKE_OSX_DEPLOYMENT_TARGET 必须在第一个 project（）命令之前初始化为缓存变量，以便正确拾取Xcode项目生成：

The variable CMAKE_OSX_DEPLOYMENT_TARGET must initialized as a cache variable prior to the first project() command in order for the Xcode project generation to be picked up properly:

set(CMAKE_OSX_DEPLOYMENT_TARGET "10.9" CACHE STRING "Minimum OS X deployment version")

如果未显式设置为 cache 变量，则会由 CMAKE_OSX_DEPLOYMENT_TARGET > MACOSX_DEPLOYMENT_TARGET 环境变量。

If not set explicitly as a cache variable the CMAKE_OSX_DEPLOYMENT_TARGET is initialized by the MACOSX_DEPLOYMENT_TARGET environment variable.

像上面的赋值一样，初始化缓存变量也将覆盖非缓存变量的值。在相同范围内具有相同的名称。

The initialization of a cache variable like in the assignment above will also override the value of non-cache variables of the same name in the same scope.

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