如何解决Visual Studio 2022 Community多仓库解决方案编译问题

解决方案目录结构 #

TestApp (solution)  
├─ TestApp (project)    
├─ Submodules  
          ├─ TestLib (solution)   
                ├─ TestLib (project)  
                      ├─ 3rd_party  
                      |      ├─ include  
                      |            ├─ nlohmann  
                      ├─ pch.h  
                     ├─ TString.h  
                     ├─ TargetEntity.h

环境说明 #

• nlohmann是JSON库
• TestLib是静态库，被TestApp引用，同时是TestApp仓库的git submodule
• TestApp的附加包含目录配置如下：

$(SolutionDir)Submodules\TestLib\TestLib\3rd_party\include;
$(SolutionDir)Submodules\TestLib\;
%(AdditionalIncludeDirectories)

完整代码 #

TestApp #

main.cpp:

#include "TestLib/TargetEntity.h"
#include "TestLib/TString.h"
//#include "nlohmann/json.hpp"

int main()
{
    //nlohmann::json json;
    //json["abc"] = 765;
    TargetEntity te;
    TString      ts;
}

TestLib #

pch.h:

#ifndef PCH_H
#define PCH_H

#define WIN32_LEAN_AND_MEAN
#include "TString.h"
//#include "nlohmann/json.hpp"

#endif // PCH_H

pch.cpp:

#include "pch.h"

TString.h:

#pragma once

#include <string>

using TString = std::wstring;

TargetEntity.h:

#pragma once

//#include "TString.h" // 取消注释可解决错误
//#include "nlohmann/json.hpp" // 取消注释可解决错误

class TargetEntity
{
public:
    virtual ~TargetEntity() = default;

    //void InitializeFromJson(const nlohmann::json& json) {}

protected:
    TString url;
};

TargetEntity.cpp:

#include "pch.h"
#include "TargetEntity.h"

编译错误信息 #

编译TestApp时，VS报错如下：

Build started...
1>------ Build started: Project: TestLib, Configuration: Debug x64 ------
1>pch.cpp
1>TargetEntity.cpp
1>TestLib.vcxproj -> ...\Temp\TestApp\Build-TestLib-x64-Debug\TestLib.lib
2>------ Build started: Project: TestApp, Configuration: Debug x64 ------
2>TestApp.cpp
2>...\Temp\TestApp\Submodules\TestLib\TestLib\TargetEntity.h(13,13): error C3646: 'url': unknown override specifier
2>...\Temp\TestApp\Submodules\TestLib\TestLib\TargetEntity.h(13,16): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
2>Done building project "TestApp.vcxproj" -- FAILED.

问题描述 #

TestLib作为独立解决方案编译，或在TestApp中单独编译均正常，但编译TestApp时出现上述错误，推测VS在编译TestApp时忽略了TestLib的预编译头。已知在TargetEntity.h中手动包含TString.h可解决错误，但不想在整个库的头文件中都添加这类手动包含。

内容的提问来源于stack exchange，提问作者qloq