C++ code base not compiling with gcc-15 (Debian report)

Many piece of our software stack an in danger to be expelled from Debian experimal.

This is what a monitoring of our Debian dev team dasboard shows, see https://tracker.debian.org/teams/kiwix-team/.

Here a specific report about the libzim https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1097294

I wonder what is the best approach to solve this problem?

