What happens if I load the GPL library using Qt's QPluginLoader?
I am using Qt commercial license.
Qt can use the *.so libraries loaded via the QPluginLoader.
If I load the GPL v2 library through QPluginLoader in my program, will my program become GPL v2?
My program is not a GPL because my program is not a dynamic link with the GPL library?
I'm sorry I don't have enough English.
It should be fine - plugin (by it's very nature) is loaded dynamically, so it is clearly a separate entity and should not force any license on your code.
(I'm not a lawyer, though, I may be wrong about it)
IIRC, that's more complicated than that. You should ask a lawyer or at least contact the fsfe to get their opinion on that.