Max identifier length

Question

Where can I find what is the maximum identifier length in C?

In which header file is that limit specified?

Answer 1

Since there are some bizarre corner cases where it is helpful to have code aware of the limit, here is a method that can be placed in a (albeit hideous to look at) header file:

#define SOMEREALLYREALLY...REALLYLONGNAME 1
#if SOMEREALLYREALLY
#define MAXIDENT 16
#elif SOMEREALLYREALLYR
#define MAXIDENT 17
#elif SOMEREALLYREALLYRE
#define MAXIDENT 18
...and so on

Eventually, the #ifs will either hit truncated identifier, or the full identifier if the compiler doesn't truncate