Kim F. Storm wrote:
Luc Teirlinck <teirllm@dms.auburn.edu> writes:
  
Frank-Schmitt wrote:

   If this is necessary before a bootstrap, why doesn't bootstrap depend on
   maintainer-clean?

It used to, but that was changed to make bootstrapping run faster at
the expense of an occasional failure.  (Personally, I believe that
change was a mistake.)
    

I agree that bootstrap should do maintainer-clean.
  
I wasn't aware of the change so I was a bit confused by the original report. If you want to compile faster, use "make recompile" to recompile the .elc files followed by a normal "make".

The cases where recompile is not enough and bootstrap is really necessary are probably the same cases of "occasional failure" above.