To build:

bazelisk build //hello_xtensa --platforms=//hello_xtensa:qemu_xtensa_dc233c

Then to run:

qemu-system-xtensa -nographic -machine virt -cpu dc233c -semihosting -kernel bazel-bin/hello_xtensa/hello_xtensa

Use Ctrl-A + X to exit from QEMU.

qemu-system-xtensa can be downloaded as part of the “hosttools” package from the Zephyr SDK: https://github.com/zephyrproject-rtos/sdk-ng/releases.