CMake AUTOMOC具有不同文件夹中的文件 [英] CMake AUTOMOC with files on different folders

问题描述

我有一个简单的CMake项目:

I have a simple CMake project:

proj (project folder)
├── a.h
├── a.cpp
└── CMakeLists.txt

CMakeLists.txt:

CMakeLists.txt:

cmake_minimum_required(VERSION 3.2)

set(CMAKE_VERBOSE_MAKEFILE ON)

set(CMAKE_AUTOMOC ON)

project(proj)

set( proj_SOURCE
    a.cpp
)

find_package(Qt5Core)

set( proj_LIBRARIES
    Qt5::Core
)

add_library(proj SHARED ${proj_SOURCE})
target_link_libraries(proj ${proj_LIBRARIES})

a.h:

#pragma once

#include <QObject>

class A : public QObject
{
    Q_OBJECT
public:
    explicit A(QObject *parent = 0);
};

a.cpp:

#include "a.h"

A::A(QObject *parent) : QObject(parent)
{
}

，一切编译都很棒.接下来，我尝试将标头文件和源文件移动到另一个文件夹中，如下所示:

and everything compiles great. Next, I tried to move the header file and the source file into different folder as so:

proj (project folder)
├── include
│   └── a.h
├── src
│   └── a.cpp
└── CMakeLists.txt

并尝试了以下调用的不同配置:

And tried different configurations of the following calls:

include_directories("include")
include_directories("src")

set( proj_SOURCE
    src/a.cpp
)

不管我做什么，编译都会因

Dosen't matter what I do the compilation fails with variations of

a.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl A::metaObject(void)const
" (?metaObject@A@@UEBAPEBUQMetaObject@@XZ) [C:\Users\me\AppData\Local\Temp\subclass\build\proj.vcxproj]
a.obj : error LNK2001: unresolved external symbol "public: virtual void * __cdecl A::qt_metacast(char const *)" (?qt_metacast@A
@@UEAAPEAXPEBD@Z) [C:\Users\me\AppData\Local\Temp\subclass\build\proj.vcxproj]
a.obj : error LNK2001: unresolved external symbol "public: virtual int __cdecl A::qt_metacall(enum QMetaObject::Call,int,void *
 *)" (?qt_metacall@A@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z) [C:\Users\me\AppData\Local\Temp\subclass\build\proj.vcxproj]
C:\Users\me\AppData\Local\Temp\subclass\build\Debug\proj.exe : fatal error LNK1120: 3 unresolved externals [C:\Users\me\Ap
pData\Local\Temp\subclass\build\proj.vcxproj]

我不知道我是否需要为CMake设置一些额外的功能或问题是什么. 此答案表示CMake无法在此配置下正常工作(不同文件夹中的文件) ，但是也许有办法吗?

I don't know if I need to set something extra for CMake to work or what the problem is. This answer says that CMake does not work well on this configuration (files on different folders), but maybe there is a way?

推荐答案

从CMake用户列表中:在这种特定配置下，似乎需要将头文件添加到目标中.我仍然不知道为什么，但是下面的代码回答了上述问题.

From the CMake users list: It seems like on this specific configuration one needs to add the header files to the target. I still dont know exactly why, but code below answers the above question.

cmake_minimum_required(VERSION 3.2)

set(CMAKE_VERBOSE_MAKEFILE ON)

set(CMAKE_AUTOMOC ON)

project(proj)

set( proj_SOURCE
    a.cpp
)

# add this
set( proj_HEADER
    include/a.h
)

find_package(Qt5Core)

set( proj_LIBRARIES
    Qt5::Core
)

# modify this
add_library(proj SHARED ${proj_SOURCE} ${proj_HEADER})
target_link_libraries(proj ${proj_LIBRARIES})

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