Cygwin's default user interface will be the bash shell working inside the mintty terminal emulator.[25] The DLL also implements pseudo terminal (pty) devices, and Cygwin ships with a number of terminal emulators that are according to them, such as rxvt/urxvt and xterm. The version of GCC that comes with Cygwin https://acgwin97306.blogdal.com/37681533/little-known-facts-about-acgwin