llvm-mingw is a mingw toolchain (freely redistributable toolchain targeting Windows), built entirely with LLVM components instead of their GNU counterparts, intended to work as a drop-in replacement for existing GNU based mingw toolchains. Initially, the project mainly aimed at targeting Windows on ARM, but the toolchain supports all of i686, x86_64, armv7 and aarch64, and has been getting use also for projects that don't target ARM.

In this talk I describe how the project got started, and how I made a working toolchain for Windows on ARM64 before that even existed publicly.

https://github.com/mstorsjo/llvm-mingw/