Binary package “gcc-xtensa-lx106” in ubuntu oracular

GNU Compiler Collection for Xtensa lx106 core

 Bare metal C, C++ and D cross compilers for chips using the Xtensa lx106
 core, such as the Espressif ESP8266 wireless SoCs. This package is
 primarily for those developing for the ESP8266 platform and is not needed
 by normal users or developers.