Incremental Builds
The C++ code generated by the IL2CPP scripting backend can be updated incrementally, allowing incremental C++ build systems to compile only the changes source files. This can signifigantly lower iteration times with the IL2CPP scripting backend. Incremental builds with IL2CPP are supported on the iOS platform only now.
To use incremental builds, choose the “Append” option after selecting “Build” from the “Build Settings” dialog. The “Replace” option will perform a clean build.