GNU bug report logs - #25268
25.1; configure.ac libpng search error

Previous Next

Full log

View this message in rfc822 format

From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: "James K. Lowden" <jklowden <at> schemamania.org>
Subject: bug#25268: closed (Re: 25.1; configure.ac libpng search error)
Date: Sun, 25 Dec 2016 01:09:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#25268: 25.1; configure.ac libpng search error

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 25268 <at> debbugs.gnu.org.

-- 
25268: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=25268
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: "James K. Lowden" <jklowden <at> schemamania.org>
Cc: 25268-done <at> debbugs.gnu.org
Subject: Re: 25.1; configure.ac libpng search error
Date: Sat, 24 Dec 2016 17:08:10 -0800

[Message part 3 (text/plain, inline)]

> I believe the fix is to change line 3413 of configure.ac to read:
>
>     png_libs=`(libpng-config --ldflags) 2>&AS_MESSAGE_LOG_FD` || {

Thanks, I did something along those lines by installing the attached patch into 
master, and I'm boldly marking the bug report as done.

> although IMO that's not quite sufficient, because it doesn't set RPATH.

--ldflags is supposed to output any -R options needed, no? If it's not, it 
sounds like the libpng-config configuration is incorrect.

[0001-Use-libpng-config-ldflags-not-libs.patch (text/x-diff, attachment)]

[Message part 5 (message/rfc822, inline)]

From: "James K. Lowden" <jklowden <at> schemamania.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.1; configure.ac libpng search error
Date: Sat, 24 Dec 2016 16:31:08 -0500

configure.ac uses libpng-config, if installed, to determine the include
directive for the PNG library.  Unfortuately, it does not correctly use
libpng-config for the linker flags.  Consequently, it may mismatch the
header file to the library.  In my case, configure misdiagnosed my
setup, and recommended --no-png.

On my system, a libpng-config was installed by the Anaconda scientific
Python package distribution.  Because I had allowed Anaconda to place
itself earlier in the path than /usr/bin, that is the version configure
used.  I suspect the error I describe below has not been detected before
because my setup is unusual.

First, let's see what libpng-config has to say on my system: 

$ for opt in cflags ldflags libs
do
        cmd="libpng-config --$opt"
        printf "%-25s: %-s\n" "$cmd" "$($cmd)"
done
libpng-config --cflags   : -I/usr/local/anaconda/include/libpng16
libpng-config --ldflags  : -L/usr/local/anaconda/lib -lpng16
libpng-config --libs     : -lpng16

Now, let's look at how libpng-config is used in configure.ac:

$ grep -n libpng-config configure.ac
3412:    png_cflags=`(libpng-config --cflags) 2>&AS_MESSAGE_LOG_FD` &&
3413:    png_libs=`(libpng-config --libs) 2>&AS_MESSAGE_LOG_FD` || {
3414:      # libpng-config does not work; configure by hand.

As you can see, png_libs relies on

   libpng-config --libs

not

   libpng-config --ldflags

The produced configure script therefore finds an include file under
ananconda, but does not provide the associated -L option to the
linker.  The configure test fails because a symbol declared in the
header file is not supplied by the (older) libpng found by the linker.  

I believe the fix is to change line 3413 of configure.ac to read:

    png_libs=`(libpng-config --ldflags) 2>&AS_MESSAGE_LOG_FD` || {

although IMO that's not quite sufficient, because it doesn't set RPATH.  

I worked around the problem before completely diagnosing it simply by
renaming /usr/local/anaconda to /usr/local/.anaconda, taking it out of
the PATH and causing configure not to find it.  The outputs are:

    $ /usr/bin/libpng-config --cflags --libs
    -I/usr/include/libpng12
    -lpng12

which worked just fine.  In fact, I used report-emacs-bug in the newly
built emacs to send this message.

The rest of this message was produced by report-emacs-bug.  I include it
in case there are details you can use.

Humbly submitted,

--jkl




In GNU Emacs 25.1.2 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
 of 2016-12-17 built on willow.schemamania.org
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:	Ubuntu 16.04.1 LTS

Configured using:
 'configure --with-x-toolkit=gtk3 --with-toolkit-scroll-bars
 --without-dbus --without-gconf --without-gsettings'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM NOTIFY ACL LIBSELINUX
GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11

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

Major mode: GNUmakefile

Minor modes in effect:
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  recentf-mode: t
  global-ede-mode: t
  ede-minor-mode: t
  global-semanticdb-minor-mode: t
  global-semantic-idle-scheduler-mode: t
  semantic-idle-scheduler-mode: t
  semantic-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  global-auto-complete-mode: t
  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
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
[yas] Loading for `makefile-mode', just-in-time: (lambda nil (yas--load-directory-1 (quote /home/jklowden/.emacs.d/elpa/yasnippet-20160416.831/snippets/makefile-mode) (quote makefile-mode)))!
[yas] Loading snippet files from /home/jklowden/.emacs.d/elpa/yasnippet-20160416.831/snippets/makefile-mode
Parsing Makefile (LL)...
[yas] Loading for `text-mode', just-in-time: (lambda nil (yas--load-directory-1 (quote /home/jklowden/.emacs.d/elpa/yasnippet-20160416.831/snippets/text-mode) (quote text-mode)))!
[yas] Loading snippet files from /home/jklowden/.emacs.d/elpa/yasnippet-20160416.831/snippets/text-mode
[yas] Loading for `c-mode', just-in-time: (lambda nil (yas--load-directory-1 (quote /home/jklowden/.emacs.d/elpa/yasnippet-20160416.831/snippets/c-mode) (quote c-mode)))!
[yas] Loading snippet files from /home/jklowden/.emacs.d/elpa/yasnippet-20160416.831/snippets/c-mode
[yas] Loading for `cc-mode', just-in-time: (lambda nil (yas--load-directory-1 (quote /home/jklowden/.emacs.d/elpa/yasnippet-20160416.831/snippets/cc-mode) (quote cc-mode)))!
[yas] Loading snippet files from /home/jklowden/.emacs.d/elpa/yasnippet-20160416.831/snippets/cc-mode
Parsing prim-workalike/Makefile (LL)...done

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired rfc822 mml mml-sec epg
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader sendmail rfc2047 rfc2045 ietf-drums mail-utils
semantic/tag-file semantic/bovine/c hideif semantic/bovine/c-by
semantic/lex-spp semantic/bovine/gcc semantic/analyze/refs
auto-complete-c-headers tramp tramp-compat auth-source gnus-util mm-util
help-fns mail-prsvr password-cache tramp-loaddefs trampver ucs-normalize
shell pcomplete format-spec cc-mode cc-fonts cc-guess cc-menus cc-cmds
cc-styles cc-align cc-engine cc-vars cc-defs nroff-mode vc-git diff-mode
easy-mmode semantic/db-file data-debug cedet-files semantic/bovine/make
semantic/decorate/include semantic/db-find semantic/db-ref
semantic/decorate/mode semantic/decorate pulse semantic/dep
semantic/analyze semantic/sort semantic/scope semantic/analyze/fcn
semantic/bovine/make-by semantic/bovine make-mode pp server time-date
recentf tree-widget ede/speedbar ede/files ede ede/detect ede/base
ede/auto ede/source eieio-speedbar speedbar sb-image dframe eieio-custom
wid-edit semantic/db-mode semantic/db eieio-base semantic/idle
semantic/format ezimage semantic/tag-ls semantic/find semantic/ctxt
semantic/util-modes semantic/util semantic semantic/tag semantic/lex
semantic/fw eieio eieio-core mode-local find-func cedet yasnippet advice
flymake compile comint ansi-color ring auto-complete-config
auto-complete popup finder-inf ac-c-headers-autoloads
auto-complete-c-headers-autoloads auto-complete-autoloads avy-autoloads
format-sql-autoloads popup-autoloads sql-indent-autoloads
unbound-autoloads xcscope-autoloads xkcd-autoloads yasnippet-autoloads
package epg-config seq byte-opt bytecomp byte-compile cl-extra help-mode
easymenu cconv cobol-mode derived cl-macs skeleton cl-seq cl gv edmacro
kmacro cl-loaddefs pcase cl-lib mule-util tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win
term/common-win x-dnd 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
inotify dynamic-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 459597 15119)
 (symbols 48 34093 0)
 (miscs 40 840 561)
 (strings 32 79645 25011)
 (string-bytes 1 2027516)
 (vectors 16 60451)
 (vector-slots 8 1036169 7841)
 (floats 8 1072 263)
 (intervals 56 1709 70)
 (buffers 976 29)
 (heap 1024 69942 1543))

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.