Thanks, so what I've tried now is :  ./update-workspaces.sh --cc=gcc-12 cd gcc make And ./update-workspaces.sh --cc=clang-18 cd gcc #Can't see any other folders make   If i pass a compiler version i don't have to update-workspaces.sh, it tell me so. Therefor I'm guessing i do have to compiler I'm passing above. Yet compilation fails in both cases.   With gcc  /usr/include/fmt/core.h:2201:22: error: ‘constexpr void fmt::v8::basic_format_parse_context<Char, ErrorHandler>::on_error(const char*) [with Char = char; ErrorHandler = fmt::v8::detail::error_handler]’ called in a constant expression 2201 | context_.on_error(message); With clang In file included from ../../../source/ps/GameSetup/GameSetup.cpp:84: ../../../source/scriptinterface/FunctionWrapper.h:518:6: error: call to consteval function 'fmt::basic_format_string<char, std::basic_string<char> &>::basic_format_string<char[51], 0>' is not a constant expression 518 | "Failed defining function {:?} on the native scope.", classInfo->name)}; | ^  

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I think you are using gcc instead, if you want to use clang you have to set CXX environment variable or pass --cc=clang to update-workspace.sh, also your gcc version is likely older then gcc-12.

That do fix the error, but compilation fails later with another forward declaration and a bunch of new errors too. I have clang 18.1.8, rusc 1.91.0  

@nifa Want to take a crack at this one?