[Marble-devel] Marble linking against wrong version of Qt

[Josh Knox]

Hi!

In my project I'm using a local build of Qt 4.8.4. I have it installed 
in /opt/Qt/4.8.4. When I build Marble, I put the location of qmake for 
this version on my path:

   export PATH=/opt/Qt/4.8.4/bin:$PATH

The correct version of Qt is found:

   %> which qmake
   /opt/Qt/4.8.4/bin/qmake


When I run cmake it finds the correct version:

   %> cmake -DCMAKE_BUILD_TYPE=Debug -DQTONLY=TRUE \ 
-DCMAKE_INSTALL_PREFIX=/opt/marble  ../marble-stable/sources
   ...
   ...
   Found Qt4: /opt/Qt/4.8.4/bin/qmake (found version "4.8.4")
   ...
   ...


make runs fine but when I run it with the rest of my application, also 
built against my Qt4.8.4 build I get this runtime error:

   Cannot mix incompatible Qt library (version 0x40801) with this 
library (version 0x40804)
Aborted (core dumped)


And indeed I discover that the marble libs are linked against the 
system's Qt. Here's the ldd for my app and the marble lib I built:

%> ldd /opt/lw/bin/playtracks
         ...
         ...
         libmarblewidget.so.15 => /opt/marble/lib/libmarblewidget.so.15 
(0x00007f90bef3b000)
         libQtGui.so.4 => /opt/Qt/4.8.4/lib/libQtGui.so.4 
(0x00007f90be3ac000)




%> ldd /opt/marble/lib/libmarblewidget.so
         linux-vdso.so.1 =>  (0x00007fff77fff000)
         libQtCore.so.4 => /usr/lib/x86_64-linux-gnu/libQtCore.so.4 
(0x00007f175e34e000)
         libQtGui.so.4 => /usr/lib/x86_64-linux-gnu/libQtGui.so.4 
(0x00007f175d680000)
         libQtXml.so.4 => /usr/lib/x86_64-linux-gnu/libQtXml.so.4 
(0x00007f175d43c000)
         libQtSvg.so.4 => /usr/lib/x86_64-linux-gnu/libQtSvg.so.4 
(0x00007f175d1e4000)
         libQtNetwork.so.4 => 
/usr/lib/x86_64-linux-gnu/libQtNetwork.so.4 (0x00007f175ce98000)


Note the different Qt libraries. Therein lies my problem. The marble 
build doesn't link with the Qt it found during the cmake pass.


So, my question is how to get marble to build against my Qt version 
rather than the system's version.

Thanks!

Josh