GCC for RISC OS cross compiler
/home/riscos/cross/bincontains the compiler binaries./home/riscos/envcontains the GCCSDK porting tools.
Run make build.
The build should utilise all the cores in your machine.
If everything is OK, the container name should be printed at the end.
If you want to upload a variant of the image, change or override
CONTAINER_NAME to reference your desired registry/repository.
Run
docker run -it -v $(pwd):/work riscosdotinfo/riscos-gccsdk-4.7:latest
which will put you in a bash shell inside the container with your current directory mounted at /work.
Note that Docker doesn't persist state between runs, so any changes you make outside /work, packages you install etc won't be preserved. If you want them to persist, read about 'docker commit'.