I've got a DLL modules linking problem!

Development Programming & Scripting
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1

Hi guys I hope everybody is doing great with their projects.

So I want to declared a function inside of the header GenericApplication.h which is already #included in most of Runtime modules. Then I’d like to define the function in WindowsApplication.h because it needs winapi types and structs. All went good. Until I tried to call the function from GameInstance.cpp which already #includes GenericApplication.h header by default.

Here is the exact code for clarification:

In GenericApplication.h:

namespace InputSystemPrototypeNS
{
     extern APPLICATIONCORE_API void InitializeInputSystem();
}

Then inside WindowsApplication.cpp:

void InputSystemPrototypeNS::InitializeInputSystem()
{
    //...
}

Finally inside GameInstance.cpp:

...
void UGameInstance::Init()
{
...
InputSystemPrototypeNS::InitializeInputSystem();
}
...

This will lead to an undefined external linkage error in the GameInstance function.