Obj-C, C#, Java, etc each define a new fixed language with new features. This doesn't. This defines a toolkit for defining a C-derived language per-project.

Obj-C, C#, Java, etc each define a new fixed language with new features. This doesn't. This defines a toolkit for defining a C-derived language per-project. This on its own adds no new features to C; it only gives you the means to add them.