On Wed, Nov 12, 2008 at 03:52:01PM -0800, Joe Buck wrote:
> On Thu, Nov 13, 2008 at 12:23:16AM +0100, nadult wrote:
> > Hello, i have some problems with empty (almost) structures containing
> > zero-sized arrays:
> >
> > struct Zero { int value[0]; };
> > int main() {
> > std::cout << "sizeof(Zero)==" << sizeof(Zero) << '\n';
> > return 0;
> > }
> >
> > The output i get for every g++ i compile it on is:
> > sizeof(Zero)==0
>
> Zero-sized arrays aren't allowed in standard C++.
>
> However, I think that this result is a bug, because g++ will normally
> ensure the size is at least one, so that each object in an array
> (or a struct/class with multiple instances of the same object) have
> distinct addresses.
>
> > Is this a bug, or maybe zero-sized arrays are gcc extension not fully
> > supported in g++?
>
> Both, I think.
Unfortunately fixing this would change the ABI, so we might be stuck
with it.
