Problem adding file sync after spdlog has been setup...

[htartisan]

I am working on a new project where I am trying to use speedlog. I have used it in the past and it seemed to work fine.

In the new project, I am creating an initial logging configuration where I create a "main" logger,, and I add a console log sink (see below).

 auto m_mainLogger =
        std::make_shared<spdlog::logger>(m_sLogName.c_str());

 auto m_consoleSink =
            std::make_shared<spdlog::sinks::stdout_color_sink_mt>();

 m_mainLogger->sinks().push_back(m_consoleSink);

That seems to work fine, and I can see (colored) log output to the console.

However, after the application configuration is loaded, I then try to add a file sink to the "main" logger (see below).

auto m_fileSink =
                std::make_shared<spdlog::sinks::rotating_file_sink_mt>
                (
                    sLogFilePath,
                    MAX_LOG_FILE_SIZE,
                    MAX_LOG_FILES,
                    ROTATE_LOGS_ON_STARTUP
                );

m_mainLogger->sinks().push_back(m_fileSink);

I can then see that the log file is opened, but I never see any log text in the log file.

Is there an issue adding additional log sinks once the initial logging configuration has been setup?

[htartisan]

Also NOTE that... I tried adding the following statement to the log configuration, after the log file sink has been added to the "main" logger...

/spdlog::set_default_logger(m_mainLogger);

When I do that, NO log text ends up going to either the console or the log file.

[tt4g]

Please submit code showing how m_mainLogger is actually used.
Without knowing that, we can't guess what is going on.

And, from auto m_mainLogger, it looks like a local variable, but why call spdlog::set_default_logger(m_mainLogger);?

[htartisan]

The shared pointers (m_mainLogger, m_consoleSink, m_fileSink) are all defined in a global class, that exists for the life of the program.

Logging statements are issued as follows:
SPDLOG_ERROR("this is an example error message");

As mentioned, this works fine at logging to the console (m_mainLogger / m_consoleSink), but the error statements don't end up in the log file.

[htartisan]

NOTE: This issue has been happening on a spdlog build in Windows x64.

I have not yet tried it in my Linux x64 build.

[tt4g]

SPDLOG_ERROR always uses the default logger.
It will not work unless set to the default logger by spdlog::set_default_logger(m_mainLogger).

See also: https://github.com/gabime/spdlog/wiki/0.-FAQ#how-to-remove-all-debug-statements-at-compile-time-

[htartisan]

I tried that. It didn't help. Russ B

…

________________________________ From: tt4g ***@***.***> Sent: Wednesday, January 8, 2025 4:04:18 AM To: gabime/spdlog ***@***.***> Cc: Russ B ***@***.***>; Author ***@***.***> Subject: Re: [gabime/spdlog] Problem adding file sync after spdlog has been setup... (Issue #3313) SPDLOG_ERROR always uses the default logger. It will not work unless set to the default logger by spdlog::set_default_logger(m_mainLogger). See also: https://github.com/gabime/spdlog/wiki/0.-FAQ#how-to-remove-all-debug-statements-at-compile-time- — Reply to this email directly, view it on GitHub<#3313 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AAER3MU7FN3I6CJ6WEA2TCT2JUH4FAVCNFSM6AAAAABUYSYUG2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDKNZXGUYDONJQGY>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[tt4g]

If you are running an application on a Windows machine, the OS will discard to buffered data (not written to a file) if the process exits without flushing the log.
Are you calling spdlog::shutdown() or logger->flush() before the application exits?