[Tile-serving] [openstreetmap/osm2pgsql] fmtlib and C++20 (Issue #1704)

[Jochen Topf]

> Any particular reason you want to stick with UDL, rather than switching to fmt::format?

The way I understood it in older versions of fmtlib you got compile time checking of format strings only when using the UDL syntax (and then only with newer C++ versions). I am not sure about that though, fmt lib docs for the older version are not available online any more. It took me a while back then to get all of it working properly and I don't want to spend the time again trying to figure out what the right way of doing things is that works across all versions. It really is a big guessing game unless the fmtlib people document what the right strategy is for backwards and forwards compatibility.

If you can research this and find a proper solution that would be great! Otherwise I think we'll just muddle through for another two or three years until we can use C++20 which comes with std::format and ditch fmtlib.

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