Build error with GCC 14, not even a warning in GCC 13

[Richard Shaw <hobbes1069@xxxxxxxxx>]

I'm working on getting a new dependency of one of my packages into Fedora:

https://github.com/socketio/socket.io-client-cpp/releases

After doing successful test builds locally in mock (no error output at all) I used fedora-create-review but all the builds failed with:

In file included from /builddir/build/BUILD/socket.io-client-cpp-3.1.0/src/internal/sio_packet.cpp:8:
/usr/include/rapidjson/document.h: In member function ‘rapidjson::GenericStringRef<CharType>& rapidjson::GenericStringRef<CharType>::operator=(const rapidjson::GenericStringRef<CharType>&)’:
/usr/include/rapidjson/document.h:319:82: error: assignment of read-only member ‘rapidjson::GenericStringRef<CharType>::length’
  319 |     GenericStringRef& operator=(const GenericStringRef& rhs) { s = rhs.s; length = rhs.length; }
      |                                                                           ~~~~~~~^~~~~~~~~~~~
gmake[2]: *** [CMakeFiles/sioclient.dir/build.make:121: CMakeFiles/sioclient.dir/src/internal/sio_packet.cpp.o] Error 1

Full logs: https://koji.fedoraproject.org/koji/taskinfo?taskID=111852023

Is this a real error?

Thanks,

Richard

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