Modifying il2cpp generated code before binary build step

I'm interested in injecting a .h header #include as well as some C++ macro signatures into the generated C++ code for il2cpp builds. Does Unity currently support subscribing to build steps to enable this kind of automated code modification? If not; is it possible to run a manual build from il2cppOutput for GameAssembly.dll?

 

For most software virtualization products, we require the ability to insert C++ macros and a header file to emit opcodes in the PE which the protection toolchain can pick up for virtualization of methods. Naturally being able to hook into an il2cpp build right after the .cpp files are generated, but before the executable is compiled, for proprietary code modification is useful. I'm aware of being able to generate a visual studio solution which would solve this issue for Windows builds but I don't know how that would work for macos. I see https://docs.unity3d.com/ScriptReference/Build.IIl2CppProcessor.html but unfortunately only a binding for before .cpp generation and not after .cpp generation.

Alternatively I can do these integrations easily if I could have a GameAssembly.dll .map file produced.

 

Thanks! I think I can automate the build processes enough with the xcode and visual studio solution options. Of course I'd prefer to have an event that I could subscribe to during Unity's build process instead but invoking a build from the command line with the xcode or visual studio solution will work just fine!