Question

I’ve something like:

struct list{
   struct list **next, **prev;
}

Global declaration:

struct list *threads = &((struct list){&threads, &threads});
void* vp_threads;      /Error here:  previous declaration of 'vp_threads' was here
vp_threads = threads;  //Error here: conflicting types for vp_threads

2nd way I tried:

void* vp_threads = threads; //Error: initializer element is not constant

I have to do this because … (see below!)

void some_func()
{
   add_head(vp_threads, ...)
...
}

void add_head(void* x, ...)
{ ... }

(PS: And there’s not main() or initialization function, this’s core.c file kind of, implementing all the functions which are in .h)

Why this’s not working, I’m just trying to make void* to point to my structure. what’s wrong with this?

Answer 1

try doing

vp_threads = threads;

in main ( or an initialization function )

you can’t put a statement in global scope. your statement vp_threads = threads; would have to live inside a function somewhere