On Sun, Jul 1, 2012 at 6:32 PM, Charles Forsyth <[email protected]>wrote:
> Yes, I was assuming the same approach as for the existing void data > declaration, that the structure is given a nominal size, > for just the reasons you give. (That's what gcc seems to do.) > > On 1 July 2012 23:22, Comeau At9Fans <[email protected]> wrote: > >> Many compilers do just that, however, that said, unless the compiler is >> prepared for it, since it effectively yields a struct of zero size which >> normally is a no-go, it could produce bugs involving sizeof, initializers, >> pointer addition et al, even some divisions by zero if the compiler is >> making certain assumptions already, unless it already can have zero length >> objects of this nature for some other reasons. > > Actually gcc gives it (the empty struct) sizeof zero (same as for its zero length arrays). Comeau mimics that behavior in gcc-mode, but used to/still can also generate a dummy internal member too (usually a char bringing forth sizeof 1). -- Greg Comeau / 4.3.10.1 with C++0xisms now in beta! Comeau C/C++ ONLINE ==> http://www.comeaucomputing.com/tryitout World Class Compilers: Breathtaking C++, Amazing C99, Fabulous C90. Comeau C/C++ with Dinkumware's Libraries... Have you tried it?
