CMake-set_property找不到CACHE变量 [英] CMake - set_property could not find CACHE variable

问题描述

免责声明：：我知道问题。但是，OP的需求因我而异：他真正想要的是将应用程序移植到Linux，因此答案就在那行，而不是回答我想知道的：错误原因。

Disclaimer: I'm aware of this question. However, The OP's needs are different to mine: what he actually wants is to port an app to Linux and therefore the answers go in that line, not answering what I want to know: the reasons of the error.

我正在尝试按照此处和这里

所以我有一个非常简单的CMakeLists.txt：

So I have this very simple CMakeLists.txt:

cmake_minimum_required(VERSION 3.6)

project(datasetprograms)

set(CMAKE_CXX_STANDARD 11)

#LINES TO MAKE THE GUI DROP-DOWN:
set(TARGET_ARCHITECTURE "arm" CACHE STRING "Architecture to compile to")
set_property(CACHE TARGET_ARCHITECTURE PROPERTY STRINGS arm x86)

#Add subdirectories for each project
add_subdirectory(helloworld)

基本上，我只是按照说明进行了复制和粘贴。但是，不是在CMake GUI中有一个不错的下拉菜单，而是出现以下错误：

Basically I just copied and pasted, following the instructions. However, instead of having a nice drop-down in the CMake GUI, I got the following error:

CMake在CMakeLists.txt中出错： 9（set_property）：set_property可能
找不到CACHE变量TARGET_ARCHITECTURE。也许尚未创建

CMake Error at CMakeLists.txt:9 (set_property): set_property could not find CACHE variable TARGET_ARCHITECTURE. Perhaps it has not yet been created

问题：我在做什么错了？

Question: What I'm doing wrong?

推荐答案

您可以使用<$ c $检查变量 TARGET_ARCHITECTURE 的值c> message（），您会发现 CACHE 是该值的部分。

You may check value of variable TARGET_ARCHITECTURE using message() and you will found CACHE is a part of that value.

这是因为您在 set（）命令中使用了不常见的双引号（ ），但是特定于语言的（ ）。因此CMake将 set（）命令视为 CACHE 'd。那是错误消息的原因。

This is because you use in set() command double quotes which are not common ones (") but language-specific ("). So CMake treats set() command as not CACHE'd one. That is a reason of the error message.

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