Cygwin's default consumer interface may 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 based on them, including rxvt/urxvt and xterm. The Variation of GCC that comes along with Cygwin https://acgwin12237.bloggactivo.com/36269249/everything-about-acgwin