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bug#26597: 25.1; Compilation error on master with --enable-check-lisp-ob

From: Philipp Stephani
Subject: bug#26597: 25.1; Compilation error on master with --enable-check-lisp-object-type
Date: Fri, 21 Apr 2017 22:05:58 +0200

When compiling current master with --enable-check-lisp-object-type,
compilation fails:

/Applications/Xcode.app/Contents/Developer/usr/bin/make -C src 
VCSWITNESS='$(srcdir)/../.git/logs/HEAD' all
gcc -c  -Demacs  -I. -I. -I../lib -I../lib   -I/usr/X11/include   -D_REENTRANT 
-I/usr/local/opt/gettext/include -I/usr/local/Cellar/pcre/8.40/include 
-I/usr/local/Cellar/dbus/1.10.16/lib/dbus-1.0/include           -MMD -MF 
deps/nsterm.d -MP  -I/usr/local/Cellar/gnutls/3.5.10/include 
-I/usr/local/Cellar/p11-kit/0.23.5/include/p11-kit-1    -Wno-switch 
-Wno-tautological-constant-out-of-range-compare -Wno-pointer-sign 
-Wno-string-plus-int -Wno-unknown-attributes -ggdb3 -O0   nsterm.m
nsterm.m:6969:8: error: member reference base type 'enum z_group' is not a 
structure or union
  if (!NILP (FRAME_Z_GROUP (f)))

FRAME_Z_GROUP is indeed an enum, and NILP shouldn't be applied to it.  I
guess this works by accident if --enable-check-lisp-object-type is not
set because then Lisp_Object is a plain integer.

(Tangentially, is there any reason not to define Lisp_Object as struct
unconditionally, to avoid such coding errors?)

In GNU Emacs 25.1.1 (x86_64-apple-darwin15.6.0, NS appkit-1404.47 Version 
10.11.6 (Build 15G1004))
 of 2016-09-22 built on p
Windowing system distributor 'Apple', version 10.3.1504
Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --prefix=/usr/local/Cellar/emacs/25.1 --without-x --with-xml2
 --without-dbus --without-gnutls --with-rsvg --with-ns

Configured features:

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

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
/usr/local/share/emacs/site-lisp/f/f hides 
/usr/local/share/emacs/site-lisp/let-alist/let-alist hides 

(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec password-cache epg epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns help-mode easymenu
cl-loaddefs pcase cl-lib mail-prsvr mail-utils time-date mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel 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 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 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 196364 9526)
 (symbols 48 19634 0)
 (miscs 40 77 241)
 (strings 32 15041 5419)
 (string-bytes 1 436541)
 (vectors 16 32909)
 (vector-slots 8 654057 5600)
 (floats 8 158 96)
 (intervals 56 208 0)
 (buffers 976 19))

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