This guide outlines useful resources, tools and processes for contribution to DevilutionX.
Despite setting C++ standard to 20 in CMakeLists.txt, features from this version are not being used. The oldest compiler used is GCC 6.5 - and that defines our C++ feature set (meaning most of C++17). It's present only to take advantage of fmt::format build time errors.
The code style guide is evolving with the project.