Here is the promised information on what we currently test in terms of bootstrap paths. We use the following compilers on various machines to start the bootstrap 3.13a1 (similar to 3.13p) 3.14a1 (similar to 3.14p) 3.15a1 (similar to 3.15p) 3.16a1 5.02a1 (GCC 3.2.x based)