Nice work!

RE: gcc creating different binaries:

The gitian build does two main things to make builds reproducible:

1. Uses libfaketime.so so all calls to time()/etc during compilation return the same time.
 (I don't know if it is the compiler, linker, or archiver that likes to put timestamps in binaries)

2. Passes -frandom-seed=constant  to g++, so it doesn't create random names for generated methods.