Bug#826384: libogre-1.9.0: Does not setup its own runtime link paths (ldconfig)

[shasheene]

Package: libogre-1.9.0
Version: libgre-1.9-dev, libogre-1.8-dev (and on Wheezy, libogre-1.7.4-dev)
Severity: important

Dear Maintainer,

I have encountered this bug when attempting to build the example code for a library named 'libhand' [1], which I have recently took upon myself to maintain and update to support modern Debian/Linux.

The package libogre-dev (and its related variants) on Debian 7/8 or Ubuntu 12.04/14.04/16.04 does not appear to setup its runtime link parameters correctly.

The issue occurs when OGRE attempts to dynamically load a plugin with loadPlugin() [2] I get the following output:
*-*-* OGRE Initialising
*-*-* Version 1.8.0 (Byatis)
Loading library RenderSystem_GL
Exception: OGRE EXCEPTION(7:InternalErrorException): Could not load dynamic library RenderSystem_GL.  System Error: RenderSystem_GL.so: cannot open shared object file: No such file or directory in DynLib::load at /build/ogre-1.8-LbVXIp/ogre-1.8-1.8.0+dfsg1/OgreMain/src/OgreDynLib.cpp (line 91)

I have found a work around, if I first run:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/x86_64-linux-gnu/OGRE-1.9.0
sudo ldconfig

The application then succeeds to create a rendered image.

I am fairly new to OGRE, so I could be misusing the API (there is another call, installPlugin() that suggests using loadPlugin() if possible). I do know that loadPlugin() can use a plugin.cfg file (that specifies the linking paths), but this is not the Debian way to do runtime linking. As a user of libogre-dev, that's not a portable solution: using a script to populate the exact path to the shared objects (depending on architecture) inside a local plugin.cfg file seems to wrong way to go about it.

I would have thought the /etc/ld.so.conf.d/[arch]-linux-gnu.conf file would have sufficed for the search paths. given it doesn't appear to maybe the OGRE deb file should do something like deploy a file to /etc/ld.so.conf.d/ and run `sudo ldconfig` when it installs.

[1] https://github.com/jonkeane/libhand
[2] http://www.ogre3d.org/docs/api/1.9/class_ogre_1_1_root.html#af0744e85bddb05885a91809bcdf8f864


-- System Information:
Debian Release: 8.4
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 3.16.0-4-686-pae (SMP w/2 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)