[Rock-dev] LD_LIBRARY_PATH and Qt::UiLoader Segfault

[Sylvain Joyeux]

On 08/31/2011 02:14 PM, Alexander Duda wrote:
> On Wed, 2011-08-31 at 11:59 +0200, Sylvain Joyeux wrote:
>> On 08/31/2011 11:18 AM, Alexander Duda wrote:
>>> Someone extended the environment variable LD_LIBRARY_PATH (env.sh) with
>>> "/lib". The Qt::UiLoader cannot handle this and crashes.
>>>
>>> Question:
>>> -Why was /lib added?
>> It is a byproduct of the workaround in autobuild for debian rolling out
>> multiarch.
>>
>> In a nutshell, on Debian, pkg-config and libraries can now get installed
>> in /lib/<ARCH>  and /usr/lib/<ARCH>
>>
>> To avoid issues with that, I started adding these to the
>> PKG_CONFIG_PATH. I also added them to LD_LIBRARY_PATH as at the time I
>> saw no drawbacks.
>>> -Has someone else the same problem?
>> How can I reproduce ? I tried loading the UILoader and starting the Qt
>> designer, and had no problems
> in my case it occurs by typing the following into the shell.
> . env.sh
> irb
> require 'Qt4'
> require 'qtuiloader'
> Qt::UiLoader.new
Just to be sure: I had to do

   require 'Qt4'
   require 'qtuitools'
   app = Qt::Application.new(ARGV)
   Qt::UiLoader.new

And it worked fine

Have you tried starting irb / ruby with a gdb to check where it breaks ? 
(or getting valgrind ?)

Sylvain