Mingw-64

Mingw-64 , A fork of mingw, provides a port of GCC for 32 and 64-bit Microsoft Windows systems.

Obtaining

mingw-builds
A directory at the Sourceforge project that contains builds of Mingw-64 GCC that run on Windows. The official download page doesn't provide much help in navigating to this directory, probably because most people are going to want to download not just GCC, but a bundle containing GGC, a shell, and utilities. For example msys2