Compile error on ubuntu: error: ‘format’ is not a constant expression

[d3cod3]

I've having a compile error on ubuntu boxes while trying to compile a custom chat application.
The problem came from the logger->warn("Public address changed: {}", addrs); line inside the getDhtConfig method ( copied from dhtchat.cpp example )

/usr/include/opendht/logger.h: In instantiation of ‘void dht::log::Logger::warn(S&&, Args&& ...) const [with S = const char (&)[27]; Args = {std::vector<dht::SockAddr, std::allocator<dht::SockAddr> >&}]’:
/home/user/Development/of_v0.12.0_linux64gcc6_release_Mosaic/addons/ofxOpenDHT/src/ofxOpenDHT.cpp:167:25:   required from here
/usr/include/opendht/logger.h:68:46: error: ‘format’ is not a constant expression
   68 |         logger(LogLevel::warning, fmt::format(format, args...));

same error on ubuntu 21.04 and 22.04

Solved wrapping the format string in fmt::runtime to disable compile-time checks

in logger.h file

changed this:

 template<typename S, typename... Args>
    inline void debug(S&& format, Args&&... args) const {
        logger(LogLevel::debug, fmt::format(format, args...));
    }
    template<typename S, typename... Args>
    inline void warn(S&& format, Args&&... args) const {
        logger(LogLevel::warning, fmt::format(format, args...));
    }
    template<typename S, typename... Args>
    inline void error(S&& format, Args&&... args) const {
        logger(LogLevel::error, fmt::format(format, args...));
    }

to this:

 template<typename S, typename... Args>
    inline void debug(S&& format, Args&&... args) const {
        logger(LogLevel::debug, fmt::format(fmt::runtime(format), args...));
    }
    template<typename S, typename... Args>
    inline void warn(S&& format, Args&&... args) const {
        logger(LogLevel::warning, fmt::format(fmt::runtime(format), args...));
    }
    template<typename S, typename... Args>
    inline void error(S&& format, Args&&... args) const {
        logger(LogLevel::error, fmt::format(fmt::runtime(format), args...));
    }

Don't now if this can cause problems, but now is compiling fine.