bug#29991: Document how user can find all obsolete items he has set

[Noam Postavsky]

積丹尼 Dan Jacobson <jidanni@jidanni.org> writes:
> Alas, using
> B runs the command dired-do-byte-compile (found in dired-mode-map),
> gives:
> Byte-Compile .emacs? (y or n) y
> Compiling /home/jidanni/.emacs...
> Byte compile error for /home/jidanni/.emacs:
> t
>
> And no file is written. Just one big blank *compilation* buffer.
> Give it a try,
> http://jidanni.org/comp/configuration/.emacs

Works for me, I got this (note that I didn't load your config though):

Compiling file /home/npostavs/tmp/tmp-emacs-home/jidanni.emacs.el at Fri Jan  5 
09:54:13 2018
Entering directory ‘/home/npostavs/tmp/tmp-emacs-home/’
jidanni.emacs.el:26:45:Warning: reference to free variable ‘sh-alias-alist’
jidanni.emacs.el:26:45:Warning: assignment to free variable ‘sh-alias-alist’
jidanni.emacs.el:28:15:Warning: assignment to free variable
    ‘browse-url-chromium-program’
jidanni.emacs.el:42:2:Warning: assignment to free variable
    ‘sendmail-query-once-function’
jidanni.emacs.el:45:2:Warning: assignment to free variable ‘ispell-dictionary’
jidanni.emacs.el:46:2:Warning: ‘Buffer-menu-buffer+size-width’ is an obsolete
    variable (as of 24.3); use ‘Buffer-menu-name-width’ and
    ‘Buffer-menu-size-width’ instead.
jidanni.emacs.el:47:2:Warning: assignment to free variable ‘vc-stay-local’
jidanni.emacs.el:54:2:Warning: assignment to free variable
    ‘perl-prettify-symbols’
jidanni.emacs.el:65:2:Warning: assignment to free variable
    ‘Man-support-local-filenames’
jidanni.emacs.el:88:6:Warning: ‘toggle-read-only’ is an obsolete function (as
    of 24.3); use ‘read-only-mode’ instead.
jidanni.emacs.el:135:7:Warning: assignment to free variable
    ‘news-reply-header-hook’
jidanni.emacs.el:136:7:Warning: assignment to free variable
    ‘sc-citation-leader’
jidanni.emacs.el:137:7:Warning: assignment to free variable
    ‘mm-auto-save-coding-system’
jidanni.emacs.el:138:7:Warning: assignment to free variable
    ‘message-draft-coding-system’
jidanni.emacs.el:139:7:Warning: assignment to free variable
    ‘message-forward-show-mml’
jidanni.emacs.el:146:2:Warning: assignment to free variable
    ‘dabbrev-case-replace’
jidanni.emacs.el:148:2:Warning: assignment to free variable
    ‘dabbrev-abbrev-char-regexp’
jidanni.emacs.el:172:7:Warning: assignment to free variable
    ‘tempo-interactive’
jidanni.emacs.el:188:2:Warning: assignment to free variable
    ‘Man-notify-method’
jidanni.emacs.el:203:7:Warning: ‘term-setup-hook’ is an obsolete variable (as
    of 24.4); use either ‘emacs-startup-hook’ or ‘tty-setup-hook’ instead.
jidanni.emacs.el:210:7:Warning: assignment to free variable
    ‘dired-guess-shell-alist-user’
jidanni.emacs.el:224:7:Warning: assignment to free variable ‘apropos-do-all’
jidanni.emacs.el:238:2:Warning: assignment to free variable
    ‘header-copyright-notice’
jidanni.emacs.el:239:2:Warning: assignment to free variable
    ‘make-header-hooks’
jidanni.emacs.el:264:2:Warning: assignment to free variable
    ‘browse-url-save-file’
jidanni.emacs.el:267:2:Warning: assignment to free variable
    ‘dired-clean-up-buffers-too’
jidanni.emacs.el:298:7:Warning: assignment to free variable
    ‘makefile-cleanup-continuations-p’
jidanni.emacs.el:299:7:Warning: assignment to free variable
    ‘bbdb-mail-avoid-redundancy’
jidanni.emacs.el:303:30:Warning: reference to free variable ‘bbdb-mode-map’
jidanni.emacs.el:305:19:Warning: assignment to free variable
    ‘bbdb-phone-style’
jidanni.emacs.el:306:19:Warning: assignment to free variable
    ‘bbdb-file-coding-system’
jidanni.emacs.el:307:19:Warning: assignment to free variable ‘bbdb-offer-save’
jidanni.emacs.el:312:19:Warning: assignment to free variable
    ‘bbdb-send-mail-style’
jidanni.emacs.el:309:19:Warning: assignment to free variable
    ‘bbdb-north-american-phone-numbers-p’
jidanni.emacs.el:310:19:Warning: assignment to free variable
    ‘bbdb-check-zip-codes-p’
jidanni.emacs.el:311:19:Warning: assignment to free variable ‘bbdb-use-pop-up’
jidanni.emacs.el:313:19:Warning: assignment to free variable
    ‘bbdb-dwim-net-address-allow-redundancy’
jidanni.emacs.el:314:19:Warning: assignment to free variable
    ‘bbdb-quiet-about-name-mismatches’
jidanni.emacs.el:321:2:Warning: assignment to free variable
    ‘ffap-dired-wildcards’
jidanni.emacs.el:322:2:Warning: assignment to free variable ‘ffap-lax-url’
jidanni.emacs.el:332:2:Warning: assignment to free variable ‘ffap-ftp-regexp’
jidanni.emacs.el:333:2:Warning: assignment to free variable
    ‘ffap-ftp-sans-slash-regexp’
jidanni.emacs.el:338:2:Warning: assignment to free variable
    ‘ffap-machine-p-known’
jidanni.emacs.el:339:2:Warning: assignment to free variable
    ‘ffap-url-unwrap-local’
jidanni.emacs.el:344:2:Warning: assignment to free variable
    ‘ange-ftp-try-passive-mode’
jidanni.emacs.el:345:2:Warning: assignment to free variable
    ‘flyspell-use-global-abbrev-table-p’
jidanni.emacs.el:347:2:Warning: assignment to free variable
    ‘sh-indent-for-then’
jidanni.emacs.el:383:2:Warning: assignment to free variable
    ‘text-scale-mode-step’
jidanni.emacs.el:384:2:Warning: assignment to free variable
    ‘tar-mode-show-date’
jidanni.emacs.el:385:2:Warning: assignment to free variable
    ‘dired-guess-shell-gnutar’
jidanni.emacs.el:391:2:Warning: assignment to free variable
    ‘diff-default-read-only’
jidanni.emacs.el:399:2:Warning: assignment to free variable
    ‘Info-hide-note-references’
jidanni.emacs.el:400:2:Warning: assignment to free variable
    ‘Info-isearch-search’
jidanni.emacs.el:405:2:Warning: assignment to free variable
    ‘ps-multibyte-buffer’
jidanni.emacs.el:406:2:Warning: assignment to free variable
    ‘ibuffer-movement-cycle’

In mw-mode:
jidanni.emacs.el:444:27:Warning: assignment to free variable ‘c-basic-offset’
jidanni.emacs.el:449:33:Warning: reference to free variable
    ‘browse-url-filename-alist’
jidanni.emacs.el:481:18:Warning: reference to free variable ‘image-mode-map’
jidanni.emacs.el:485:18:Warning: reference to free variable ‘archive-mode-map’
jidanni.emacs.el:514:18:Warning: reference to free variable
    ‘flyspell-mode-map’
jidanni.emacs.el:521:34:Warning: assignment to free variable
    ‘time-stamp-line-limit’
jidanni.emacs.el:522:34:Warning: assignment to free variable
    ‘time-stamp-format’
jidanni.emacs.el:524:34:Warning: assignment to free variable
    ‘time-stamp-start’
jidanni.emacs.el:526:34:Warning: assignment to free variable ‘time-stamp-end’
jidanni.emacs.el:527:34:Warning: assignment to free variable
    ‘time-stamp-time-zone’

In end of data:
jidanni.emacs.el:546:1:Warning: the following functions are not known to be 
defined: w3m-browse-url,
    bbdb-initialize