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

[Ken Raeburn <raeburn@raeburn.org>]

On Sep 7, 2009, at 16:06, Eli Zaretskii wrote:
> We have `features' and `load-history' to help us.

Yes.

> Files loaded by loadup.el are easily extracted by simple text
> scanning, and the byte compiler itself indeed _is_ a prerequisite for
> every other compilation.

But if a minor comment change is made in the compiler source, must we  
recompile everything?  We don't generally make .o files explicitly  
depend on the C compiler.  Though, in the gcc project they probably  
do... so, yeah, maybe it's the way to go.

> Btw, I don't understand what problem do you see with files preloaded
> by loadup.  They should simply be all prerequisites of temacs, and
> that's it, right?


Well, "emacs", not "temacs" which is just linked from the C code, but  
also I was assuming we wouldn't make the emacs binary an explicit  
dependency for the .elc files; otherwise, someone downloading and  
building a release will have to recompile all the elisp code even  
though the results will differ from everyone else's only in the first  
few comment lines.

And I'm not sure if we want to list all those files as dependencies  
anyways.  We might indeed want to recompile everything if subr.el  
changes, if we can't figure out what actually used stuff from that  
file.  On the other hand, we probably don't want to recompile  
everything because lisp/language/georgian.el changed.  (Conservatively  
speaking, I suppose we should, in case someone decided to redefine  
'defcustom' there.)  Actually, I think we want to rebuild if subr.elc  
changes, other than the comments indicating who compiled it and when,  
not just for all subr.el changes, and likewise for the compiler code....

Ken