Re: Does a zero-sized object in BSS go away?

[Kazu Hirata <kazu at cs dot umass dot edu>]

Hi Thiemo,

> > > The linker should assign an address to it.  However, some object file
> > > formats can't represent zero-sized common objects, in which case the
> > > assembler should probably report an error if someone tries to create one.
> > 
> > Thanks.  That means some valid C using a zerosized object program
> > may not be represented in those formats.  Sigh...
> 
> How do you construct a zero sized object in valid C?

Oops, I just realized "struct s { char a[0] } s0;" is a GCC extension.

Kazu Hirata