Cygwin's default consumer interface is definitely the bash shell functioning in the mintty terminal emulator.[25] The DLL also implements pseudo terminal (pty) devices, and Cygwin ships with a number of terminal emulators which are according to them, such as rxvt/urxvt and xterm. The version of GCC that comes with Cygwin https://chanceuwxwx.win-blog.com/17940123/acgwin-an-overview