>"Nicolas Richard" <address@hidden> writes:
>
>> Barry OReilly <address@hidden> writes:
>>> Specifying a .emacs.d location as a command line flag would be a big
>>> help.
>>
>> You could use apropos-value to list all variables which refer to
>> .emacs.d and then modify those from command line using --eval (although
>> sometimes that directory is hardcoded, e.g. in startup.el as a fallback
>> value). In particular, user-emacs-directory is of interest, and I'd
>> trying changing it, then run apropos-value to see what remains.
>
>`user-emacs-directory' is a defconst.

I removed ~/.emacs.d, verified no ~/.emacs, executed:
   emacs --eval '(setq user-emacs-directory "my/path/.emacs.d/")'

It did not work.  More precisely, Emacs did not load
my/path/.emacs.d/init.el .  C-h v does show that user-emacs-directory has
the /my/path/.emacs.d value, however.