A front end for our demo language is provided at http:// www.gec-fsug.org/gcc-front/demo.tar.gz.
It has been tested with the GCC (version 2.95.3) back end. You can make experiments with the front end. Try to add more constructs. Constructs such as for loops, repeat until, case structure, else if, can be easily added in our demo language.
If you're successful with the creation of a new front end, please do send it to us, so that it would be a great help for the newcomers in the field of GCC front ends.