After few days searching on Google.
I found the answer.
The problem is the order you Link to Static Library.
Dependency of my Projects is:
Presentation << Utilities << DynamicObjectCore
in Presentation.pro, I'm link to Static Link Library in this order
# Link to DynamicObjectCore
...
# Link to Utilities
...
I thought that it will compile DynamicObjectCore first, then compile Utilities.
But it wan't, and cause the compile error. "undefined reference to..."
When i change the Link Order
# Link to Utilities
...
# Link to DynamicObjectCore
...
And it work.
