对QT :: RemoteObjects自动基因的const静态类成员字段（仅Windows）的未定义引用

Question

由于Microsoft DELLSPEC“ feature”，我在Windows上重复使用共享库的问题有问题。在共享库中，我使用QT :: RemoteObjects自动化源或副本类的类，我无法在库代码之外的任何地方使用信号插槽功能。考虑以下小示例：

cmakelists.txt

cmake_minimum_required(VERSION 3.11.0)
project(QtSymbolsProblem CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTOUIC ON)

set (CMAKE_CXX_STANDARD 17)
find_package(Qt5 COMPONENTS RemoteObjects Core REQUIRED)

qt5_generate_repc(GENERATED PanelInterface.rep SOURCE)
set_source_files_properties(${GENERATED} PROPERTIES GENERATED TRUE SKIP_AUTOMOC TRUE)
message(STATUS "generated sources: ${GENERATED}")
add_library(SampleProcedure SHARED
    Procedure.cpp
    ${GENERATED}
)
set_target_properties(SampleProcedure PROPERTIES
    WINDOWS_EXPORT_ALL_SYMBOLS ON
)
target_link_libraries(SampleProcedure
  Qt5::RemoteObjects
  Qt5::Core
)
add_executable(main main.cpp)
target_link_libraries(main PUBLIC SampleProcedure)

replica定义panelinterface.rep：

#include <QtCore>
#include <QString>

class PanelInterface
{
    PROP(QString foo);
};

库代码：

//// Procedure.hpp
#pragma once

#include <SampleProcedure_export.h>
#include <QObject>
#include <memory>

class PanelInterfaceSimpleSource;

class Procedure {
public:
  Procedure();
  ~Procedure();
  PanelInterfaceSimpleSource *panelInterface();

private:
  std::unique_ptr<PanelInterfaceSimpleSource> _panel;
};

//// Procedure.cpp
#include "Procedure.hpp"
#include "rep_PanelInterface_source.h"
#include <QObject>

Procedure::Procedure()
    : _panel(std::make_unique<PanelInterfaceSimpleSource>()) {}

Procedure::~Procedure() = default;

PanelInterfaceSimpleSource *Procedure::panelInterface() { return _panel.get(); }

main ostable：

#include "Procedure.hpp"
#include "rep_PanelInterface_source.h"
#include <QObject>

#include <iostream>

class Foo : public QObject {
  Q_OBJECT
public:
  Foo(Procedure &proc) {
    QObject::connect(  // this is impossible because of missing symbol
        proc.panelInterface(), &PanelInterfaceSimpleSource::fooChanged, this,
        [](QString str) { std::cout << str.toStdString() << std::endl; });
  }
};

int main() {
  Procedure proc;
  Foo foo(proc);
  return 0;
}

#include "main.moc"

在此示例code> panelInterfaceSimpleseimource是由由由自动基因生成的类QT。当我尝试连接到它的一个信号时，链接器给我错误：

main.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const PanelInterfaceSimpleSource::staticMetaObject" (?staticMetaObject@PanelInterfaceSimpleSource@@2UQMetaObject@@B)

在 cmake docs 提到

对于全局数据符号，__declSpec（dllimport）仍必须使用.dll中的代码进行编译。

我什至找到了其他一些主题提到CMAKE自动化导出标头的使用

include(GenerateExportHeader)
generate_export_header(SampleProcedure)

，但该解决方案只能与我可以修改的代码一起使用。

在QT自动化的代码中，我应该如何解决类静态变量的符号的问题？