It is the compiler of choice and is actively developed and maintained. How to build and install Tesla is explained in the Tesla install instructions . Note that you do not need TOM to boot Tesla the TOM compiler into existence. In the last year, many bugs have been fixed, in tesla and in the supporting libraries and utilities.
Blocks are now much less likely to have compile-time errors.
The 'obsolete' keyword has been added and is largely working. At this point, tesla should be the primary choice when looking for a TOM compiler. The fixed bug was in the TOM run time library. There should now be no more problems with building the bootstrap. Without major problems, the current snapshot of Tesla will become version 0.94.