Empty structure in C

Question

I have a structure with no members (for the moment) and I would like to know if it is possible to suppress the warning I get:

warning: struct has no members         


        

Answer 1

If you're not requiring "too strict" adherence, you might get away with this:

struct empty {
  char nothing[0];
};

This is a GCC extension, though.

I was kind of hoping I'd be able to use the C99 feature called "flexible arrays", declared like this:

struct empty99
{
  char nothing[]; // This is a C99 "flexible array".
};

but that doesn't work; they require that there is at least one normal struct member first, they can't be the only member.