[ungzd]

Also, GCC has Xtensa ISA used on ESP8266/ESP32.

[sanxiyn]

LLVM Xtensa port is in progress: https://github.com/espressif/llvm-xtensa

[ajross]

Lots of things are "in progress" (including rust support for gcc code generation, heh). But gcc has production-ready, mature backends for a ton of architectures that LLVM doesn't. It's a real feature.