How to make C language context-free?

Question

I know that C is not a context-free language, a famous example is:

int foo;
typedef int foo;
foo x;

In this case the lexer doesn't know, whether foo in the 3rd line, is an identifier, or typedef.

My question is, is this the only reason that makes C a Context-Sensitive Language?

I mean, if we get rid of typedef, would it become context-free language? Or there are other reasons (examples) that prevent it from being so?

user_11955004 · Answer

As per my knowledge and research there are two basic reasons that make C context sensitive language. These are:

These two can't be done by PushDown Automata (PDA) but Linear Bounded Automata (LBA) can do thes two.