On Thu, 11 May 2023, Kees Cook via Gcc wrote: > On Thu, May 11, 2023 at 06:29:10PM +0200, Alejandro Colomar wrote: > > On 5/11/23 18:07, Alejandro Colomar wrote: > > [...] > > > Would you allow flexible array members in unions? Is there any > > > strong reason to disallow them? > > Yes please!! And alone in a struct, too. > > AFAICT, there is no mechanical/architectural reason to disallow them > (especially since they _can_ be constructed with some fancy tricks, > and they behave as expected.) My understanding is that it's disallowed > due to an overly strict reading of the very terse language that created > flexible arrays in C99.
Standard C has no such thing as a zero-size object or type, which would lead to problems with a struct or union that only contains a flexible array member there. -- Joseph S. Myers jos...@codesourcery.com
