Cygwin's default user interface will be the bash shell operating 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, such as rxvt/urxvt and xterm. The version of GCC that comes with Cygwin https://caidencfgcc.blogsidea.com/43681025/not-known-factual-statements-about-acgwin