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Usage of spdlog with fmt

Rebuild and reinstall spdlog without defining `SPDLOG_FMT_EXTERNAL`.

Usage of spdlog with fmt

`include/spdlog/fmt` is a header file for spdlog to use `fmt` and `std::format` separately. Bundled fmt is `include/spdlog/fmt/bundled`.

Disabling MSVC warnings 4251 and 4275

This option was added when Windows shared libraries were supported (#1467). I do not see the need for this option. It could be removed if there is a clear reason...

Disabling MSVC warnings 4251 and 4275

PR is welcome.

How to customize the file name numbering of spdlog log rotation?

That feature is not supported. You can implement a custom sink: https://github.com/gabime/spdlog/wiki/4.-Sinks#implementing-your-own-sink

[question] spdlog v2.x status

@HaoQChen See https://github.com/gabime/spdlog/discussions/3307#discussioncomment-11733404

log_msg_buffer should also buffer source_loc char*

Duplicate #3073, #2867 PR #2935 to resolve this issue.

Logger Stall - GCC 11.4 - External FMT - Debug configuration

It looks like `fmt::format()` is formatting `long double` and the backtrace seems to stop at `fmt::v11::detail::bigint::remove_leading_zeros`. I don't think this is the spdlog problem. Also, the latest version of fmt...

Cannot use any formatting when compiling with Clang

This is fmt issue and already fixed fmtlib/fmt#4177

Example with C++20 module and std::source_location

What is the purpose of this open issue?