bug#24600: 25.2.50; Improper unicode display on MacOS

[Dave Abrahams]

Look at the following two strings.  The first should appear as a
rainbow-striped flag and the second as Cuban flag.  In Emacs built for
MacOS, they display as strings of blank space.

"🏳️‍🌈"
"🇨🇺"



In GNU Emacs 25.2.50.1 (x86_64-apple-darwin13.4.0, NS appkit-1265.21 Version 
10.9.5 (Build 13F1911))
 of 2016-09-29 built on builder10-9.porkrind.org
Windowing system distributor 'Apple', version 10.3.1504
Recent messages:
Git finished
Type C-h i to view popup manual, ? to describe an argument or action. [2 times]
Running git push -v origin flymake:refs/heads/flymake [2 times]
Git finished
Loading /Users/dave/.emacs.d/elhome/settings/org-settings.el (source)...
requested feature org-x not available
Cannot load yasnippet
Loading /Users/dave/.emacs.d/elhome/settings/org-settings.el (source)...done
Saving file /Users/dave/Desktop/Strings.org...
Wrote /Users/dave/Desktop/Strings.org

Configured using:
 'configure --with-ns '--enable-locallisppath=/Library/Application
 Support/Emacs/${version}/site-lisp:/Library/Application
 Support/Emacs/site-lisp' --with-modules'

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Org

Minor modes in effect:
  recentf-mode: t
  diff-auto-refine-mode: t
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  me-minor-mode: t
  winner-mode: t
  which-function-mode: t
  show-paren-mode: t
  server-mode: t
  ido-everywhere: t
  global-auto-revert-mode: t
  display-time-mode: t
  delete-selection-mode: t
  auto-insert-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  auto-fill-function: org-auto-fill-function
  transient-mark-mode: t

Load-path shadows:
/Applications/Emacs.app/Contents/Resources/lisp/progmodes/compile hides 
~/.emacs.d/site-lisp/non-GPL3/compile

Features:
(shadow sort mail-extr emacsbug sendmail dot-org-el ob-python ob-R
ox-org ox-latex ox-icalendar ox-html ox-ascii ox-publish ox org-element
org-habit org-agenda org-info org-id ob-sh org org-macro org-footnote
org-pcomplete org-list org-faces org-entities noutline outline
org-version ob-emacs-lisp ob ob-tangle ob-ref ob-lob ob-table ob-exp
org-src ob-keys ob-comint ob-core ob-eval org-compat org-macs
org-loaddefs cal-menu calendar cal-loaddefs linum vc vc-dispatcher
two-column iso-transl cmake-mode loadhist tramp-cache debug nnheader pp
flymake recentf tree-widget python swift-project-settings skeleton
cc-styles cc-align cc-engine cc-vars cc-defs whitespace swift-mode
dired-aux hl-line man dabbrev eieio-opt speedbar sb-image ezimage dframe
executable completion dos-w32 find-cmd grep compile find-dired vc-git
gnus-dired jka-compr misearch multi-isearch ffap thingatpt modal
elec-pair magit-blame magit-stash magit-bisect magit-remote magit-commit
magit-sequence magit magit-apply magit-wip magit-log magit-diff
smerge-mode diff-mode magit-core magit-autorevert magit-process
magit-popup magit-mode magit-git crm magit-section magit-utils
git-commit help-fns radix-tree log-edit eudc eudc-vars message subr-x
puny rfc822 mml mml-sec epa derived epg gnus-util rmail rmail-loaddefs
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr mailabbrev mail-utils gmm-utils mailheader
pcvs-util add-log with-editor async-bytecomp async tramp-sh tramp
tramp-compat tramp-loaddefs trampver shell pcomplete comint ansi-color
format-spec cus-edit+ cl page-ext system-type-darwin-theme disp-table
dired-x dired dired-loaddefs winner ring which-func imenu paren server
ido autorevert filenotify time delsel autoinsert edmacro kmacro
initsplit cus-edit cus-start cus-load wid-edit find-func elhome
use-package diminish bind-key easy-mmode finder-inf
column-enforce-mode-autoloads elhome-autoloads gh-common gh-profile rx s
marshal eieio-compat ht json map dash maxframe-autoloads info advice
package epg-config url-handlers url-parse auth-source cl-seq eieio
eieio-core cl-macs eieio-loaddefs password-cache url-vars seq byte-opt
gv bytecomp byte-compile cl-extra help-mode easymenu cconv cl-loaddefs
pcase cl-lib time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel term/ns-win ns-win
ucs-normalize term/common-win tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register
page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core term/tty-colors frame cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese charscript case-table epa-hook
jka-cmpr-hook help simple abbrev obarray minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote kqueue cocoa ns multi-tty
make-network-process emacs)

Memory information:
((conses 16 1045299 51177)
 (symbols 48 47113 0)
 (miscs 40 4152 3188)
 (strings 32 119818 28424)
 (string-bytes 1 3602373)
 (vectors 16 74194)
 (vector-slots 8 1930889 161273)
 (floats 8 580 1583)
 (intervals 56 24100 0)
 (buffers 976 87))

-- 
-Dave