Cygwin's default consumer interface would be the bash shell running within 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, including rxvt/urxvt and xterm. The version of GCC that comes along with Cygwin https://acgwin29306.newsbloger.com/37870335/not-known-facts-about-acgwin