From pauljohn at ku.edu  Sat Aug 25 12:16:08 2012
From: pauljohn at ku.edu (Paul Johnson)
Date: Sat, 25 Aug 2012 11:16:08 -0500
Subject: [Swarm-Support] Ach! Debian multilib complications for Swarm;
 /usr/lib/x86_64-linux-gnu and png
Message-ID: <5038FA48.7010209@ku.edu>

On a Debian system (mostly Wheezy), I find some trouble because of work on
multilib support. I recall that this caused a lot of trouble back when I
was using Fedora, and was pleasantly surprised not to bother with it when I
changed to Debian. All good things must pass, apparently, as the Debian
folks have now gone multi.

Shared libraries are now often installed in

/usr/lib/x86_64-linux-gnu

and the Swarm configure script can't understand that very well.  So even
though Swarm seemed to build, applications that use pixmaps in PNG are
broken, jobs die like so:

*** event raised for error: NotImplemented
*** function: -[Pixmap _loadPNG:](), file: Pixmap.m, line: 232
PNG inoput not available on this configuration*** execution terminating due
to error
Symbol.m:187 -[Error(c) _raiseEvent:]
Aborted

I checked, I can run heatbugs, but not with PIXMAPS. And that's a bummer
because my favorite heatbugs is celebrity heatbugs, with little photos of
game show hosts and fashion models running about on the heatmap.

I fiddled quite a while trying to solve this with Swarm configure options.
 No dice.

So I'm going into the configure script itself, which I've never altered
before.

Consider the zlib stanza, like so. Focus on line 11, which starts "for dir..."

test -z "$zlibdir" && zlibdir=$defaultdir
libname=z
if test -z "$libname" ; then
  libname=zlib
fi
{ $as_echo "$as_me:$LINENO: checking directory of lib${libname}" >&5
$as_echo_n "checking directory of lib${libname}... " >&6; }
_libdir="$zliblibdir"
if test "$zlibdir" != no ; then
test -z "$_libdir" && _libdir=$zlibdir/lib
for dir in  $_libdir $defaultdir/lib /usr/lib64 /usr/lib32 /usr/lib
/usr/local/lib; do
  expand_dir=`eval echo $dir`
  for suffix in .dylib .so .sl .dll.a .a; do
    if test -r $expand_dir/lib${libname}${suffix} ; then
      zliblibdir=$dir
      break
    else
      zliblibdir=''
    fi
  done
  test -z "$zliblibdir" || break
done


I believe for png, zlib, maybe others, it is necessary to insert
/usr/lib/x86_64-linux-gnu in that line, like so:

for dir in  $_libdir $defaultdir/lib /usr/lib64 /usr/lib32 /usr/lib
/usr/lib/x86_64-linux-gnu /usr/local/lib; do

That seems to help. After I do that to the zlib and png stanza, then the
configure script's output changes in a way that is hopeful. That configure
output changes from this:

checking directory of libz... no
checking directory of libpng... no
checking directory of libhdf5... ${prefix}/lib

to

checking directory of libz... /usr/lib/x86_64-linux-gnu
checking directory of zlib.h... ${prefix}/include
checking directory of libpng... /usr/lib/x86_64-linux-gnu
checking directory of png.h... /usr/include
checking directory of libhdf5... ${prefix}/lib

I was hopeful, the compile does try to build for PNG, but fails with this:


Pixmap.m: In function ?-[Pixmap _loadPNG:]?:
Pixmap.m:87:3: warning: pointer targets in passing argument 1 of
?png_sig_cmp? differ in signedness [-Wpointer-sign]
/usr/include/png.h:1002:1: note: expected ?png_const_bytep? but argument is
of type ?char *?
Pixmap.m:106:7: error: dereferencing pointer to incomplete type
Pixmap.m:142:9: warning: pointer targets in passing argument 4 of
?png_get_PLTE? differ in signedness [-Wpointer-sign]
/usr/include/png.h:2212:1: note: expected ?int *? but argument is of type
?unsigned int *?
Pixmap.m:185:13: warning: type ?id <Index>? does not conform to the
?MapIndex? protocol [enabled by default]
make[6]: *** [Pixmap.lo] Error 1


I'm going to try to fix this, but if somebody else has run into it, I would
really appreciate a "heads up".  It this reminds me of 2002 or so, when
there were a lot of fussy details about the particular version of libpng we
needed to use.

pj

pj


-- 
Paul E. Johnson			email: pauljohn at ku.edu
http://pj.freefaculty.org	Assoc. Director
Professor, Political Science 	Center for Research Methods and Data Analysis
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