P99 and C99 vs C11

Question

Maybe I am misunderstanding the use of the P99 library but what advantages does it provide over C11 (mainly concerned about multithreading) if anything more than being an emulator.

Speed? Efficiency?

Or just backwards compat?

Answer 1

The main advantage it provides over C11 is that it works with C99 compilers. C11 support doesn't really exist yet. It also provides many features that aren't in C11.