RE: build broken: no defun org-float-time. Who's guilty, and what does he propose?

[Drew Adams]

> > What we need IMO is a way to scan all the *.el files, look for
> > `require', and generate Make dependencies between Lisp files.  Then
> > this problem should be gone for good. Any takers?
> 
> I just spent part of the last couple of hours thinking over this  
> problem too.  Other files could be autoloaded during 
> compilation, and should be listed as dependencies too.
> 
> The byte compiler has rather a lot of information available 
> while it's doing its job.  Perhaps it could look at the files
> that were loaded as part of the compilation, and generate a
> list of dependencies.  The byte compiler code itself, and
> files loaded via loadup.el, would still present a problem;
> a conservative approach would be to always list all  
> of them as dependencies, though that would lead to excessive  
> rebuilding still.

Dunno if any of this code would help, but you might be able to adapt some of it,
depending on what you're trying to do:

http://www.emacswiki.org/emacs/LibraryDependencies

http://www.emacswiki.org/emacs/lib-requires.el
http://www.emacswiki.org/emacs/elisp-depend.el