Is there a way of compiling C11 to C89?

Question

One of my (embedded) targets only has a C89 compiler.

I am working on a (hobby) project which targets multiple devices.

Is there a way of compiling (transpiling?

Answer 1

As Carl Norum comments:

What's your target? Would it be hard to port clang/llvm?

This seems to be the promising approach.
It's not necessary to port your target, a port for C89 is enough.

So clang compiles your code to llvm and then llvm to c89 and then you get it.