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将SpdLog与模块/C++20一起使用会导致内部编译器错误(MSVC 2022)

spdlog c++20 module

Todd Burch · 技术社区 · 3 年前

我只想封装标题 spdlog C++20模块中的日志记录库,该库将spdlog库保留在模块内部。Logger类是Meyers风格的单例,我认为它很简单,但给我带来了很多麻烦。这是我试图解决的简化版本(请注意,虽然我专业地使用C#进行开发,但我对C++还是很陌生)。

我的 Logger.cppm 模块如下所示:

module;

#pragma once

#include "spdlog/spdlog.h"
#include "spdlog/sinks/stdout_color_sinks.h"

export module Logger;

import <memory>;

export namespace ThreeSpace
{
    class Logger final
    {
    public:
        Logger(const Logger&) = delete;
        Logger& operator=(const Logger&) = delete;

        static void Trace() { Get()->trace("Test"); }

    private:
        std::shared_ptr<spdlog::logger> s_logger;

        Logger() : s_logger(spdlog::stdout_color_mt("Logger Name"))
        {}

        ~Logger() = default;

        static std::shared_ptr<spdlog::logger>& Get()
        {
            static Logger instance;
            return instance.s_logger;
        }
    };  
}

这是在我的Visual Studio 2022解决方案中一个名为“Core”的项目中。该项目成功地构建为一个静态库,没有任何问题。

然而,在引用“Core”项目的应用程序项目(可执行文件)中,我有一个简单的“Main.cppm”模块,它试图使用记录器:

export module Main;

import Logger;

export int main()
{
    ThreeSpace::Logger::Trace();
}

此项目未成功生成。我在生成日志中得到以下内容:

Build started...
1>------ Build started: Project: ThreeSpace, Configuration: Debug x64 ------
1>Scanning sources for module dependencies...
1>Scanning sources for module dependencies...
1>Main.cppm
1>Compiling...
1>Main.cppm
1>C:\Dev\ThreeSpace\ThreeSpace\src\Main.cppm(9): fatal  error C1001: Internal compiler error.
1>(compiler file 'msc1.cpp', line 1589)
1> To work around this problem, try simplifying or changing the program near the locations listed above.
1>If possible please provide a repro here: https://developercommunity.visualstudio.com
1>Please choose the Technical Support command on the Visual C++
1> Help menu, or open the Technical Support help file for more information
1>INTERNAL COMPILER ERROR in 'C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\bin\HostX64\x64\CL.exe'
1>    Please choose the Technical Support command on the Visual C++
1>    Help menu, or open the Technical Support help file for more information
1>Done building project "ThreeSpace.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 1 up-to-date, 0 skipped ==========
========== Build started at 10:21 PM and took 02.443 seconds ==========

如果我注释掉对ThreeSpace::Logger::Trace();的调用;,该应用程序运行良好。

你知道我做错了什么吗?现在是2023年,C++20代码出现这样一个通用的“内部编译器错误”真是令人沮丧!

0 回复 | 直到 3 年前

Todd Burch 3 年前

好吧,经过随机实验,我修复了它。我所要做的就是把Trace()定义变成一个声明,然后在类之外定义方法,如下所示:

module;

#include "spdlog/spdlog.h"
#include "spdlog/sinks/stdout_color_sinks.h"

export module Logger;

import <memory>;

export namespace ThreeSpace
{
    class Logger final
    {
    public:
        static void Trace();  //This is now just a declaration.
        Logger(const Logger&) = delete;
        Logger& operator=(const Logger&) = delete;

    private:
        std::shared_ptr<spdlog::logger> s_logger;

        Logger() :
            s_logger(spdlog::stdout_color_mt("Logger Name"))
        { }

        ~Logger() = default;

        static std::shared_ptr<spdlog::logger>& Get()
        {
            static Logger instance;
            return instance.s_logger;
        }
    };  

    //The definition of the method is now outside the class.
    void Logger::Trace() { Get()->trace("Test"); }
}

我不知道为什么这能解决问题,但它确实解决了!