[Tinycc-devel] How to tell if variable is global?

[Joshua Phillips]

How can I tell if a variable has global scope?
possible methods I have considered:
  -  iterating through global_stack or local_stack (yuk)
  -  if ((sym->r & (VT_VALMASK | VT_LVAL)) == (VT_CONST | VT_LVAL))  - is this 
reliable?
  -  encoding a flag in the symbol structure to mark it as global

what do you think?

I need this because I'm half way through fixing the following:
> int a, a;
should compile if it is global, but not if it is local. tcc ignores.
> int a,
> short a;
should never compile. tcc ignores.
> int a;
> {
>     int a;
> }
inside a function should compile though.
> void foo(int a, int a)
should raise an error, tcc ignores.
Problems also exist for struct/union/enum