RESOLVED
RenderResource.h notes the solution via this comment:
/**
* NOTE - Adding new virtual methods to this class may require stubs added to FViewport/FDummyViewport, otherwise certain modules may have link errors
*/
The files you need to add stubs to are:
- UnrealClient.h
- SceneViewport.h
(I would post this solution as an answer but my question has not been approved by a moderator yet.)
ORIGINAL POST
I declared and defined a public virtual function in a class but I’m receiving a linker error which states that the linker cannot find the definition of this function.
Here is where I declare and define the function:
virtual void InitRHI_ALLOW_UNORDERED_ACCESS() {}
Here is the error:
Error LNK2001 unresolved external symbol "public: virtual void __cdecl FRenderResource::InitRHI_ALLOW_UNORDERED_ACCESS(void)" (?InitRHI_ALLOW_UNORDERED_ACCESS@FRenderResource@@UEAAXXZ) UE4 <PATH>\Engine\Intermediate\ProjectFiles\Module.DistCurveEditor.cpp.obj 1
More context:
I’m modifying Engine\Source\Runtime\RenderCore\Public\RenderResource.h to add a second version of InitRHI() that allows a UAV to be created for a resource. I followed what InitRHI() does and how it’s called, but my addition is leading to the error above. I cleaned the project files with Visual Studio in case an old .obj was being used, but the error has persisted.
InitRHI() is declared and defined in the same way:
virtual void InitRHI() {}
Perhaps this is a general question that belongs on StackOverflow but the context of modifying Unreal Engine source code seems important. For example, Module.DistCurveEditor.cpp.obj could be a clue.
Here are all the files with the same linker error:
- Module.DistCurveEditor.cpp.obj
- Module.FontEditor.cpp.obj
- Module.Cascade.cpp.obj
- Module.MediaFrameworkUtilitiesEditor.cpp.obj
- Module.DetailCustomizations.1_of_4.cpp.obj
Three out of the five files contain the string “Editor”.
None of the source corresponding to these object files were modified directly, and the purpose of creating a new InitRHI function was to avoid affecting any other part of the engine. The engine calls InitRHI by default and doesn’t know about my new function, except for a tiny custom area. This tiny custom area is only called by project-level code, not engine-level code.