[Qt-interest] plugin fails to load with uresolved links to another plugin

[Kishore]

This was originally posted here http://www.cmake.org/pipermail/cmake/2010-
June/037516.html

I am building a plugin based qt application (my first time with plugins) and my 
situation, like with many other applications is that plugin A depends on 
plugin B. In my application i take care to load plugin B before A. However,
loading plugin A with QPluginLoader fails complaining that it could not 
resolve links to API which are in B. plugin B which only depends on the 
application API loads fine.

Now, everything works fine if i declare that plugin A depends on B using the
TARGET_LINK_LIBRARIES() (I use the CMake build system) function. But for this 
to work, i have to declare both A and B as SHARED instead of MODULE libraries.

What i expect is that since plugin B is already loaded plugin A loads without 
error. What am i doing wrong? The Qt example apps do not demonstrate the case 
where one plugin calls API of another.

I'm using Qt 4.6.3 on Kubuntu 10.04
-- 
Cheers!
Kishore

Ps: I also tried declaring an API in the application main code without 
implementing it and call this API in plugin B. plugin B still compiles and 
loads fine but the application crashes only at the line where the API is 
accessed. So my guess is that it is possible to load plugins even if there 
effectively are unresolved symbols as long as they are not used, Is that right?