On Thu, 29 Sep 2011 17:10:26 +0200 Tristan Gingold <ging...@adacore.com> wrote:
> Hi, > > DEC-C, the DEC compiler provided on VMS, has added to ANSI-C at least one > extension that is difficult to work-around as it is used in the system > headers: varargs without named argument. It makes sense on VMS because of > its ABI which pass the number of arguments used. > I believe that such an extension is useful on other systems, even when their ABI don't pass the number of arguments. The use case I would have in mind is when the signature of the called function (that is the number & types of arguments) is determined by something else, perhaps a global variable or data. Think e.g. of a printf-like function, except that the format string is conventionally assigned to some fixed global before calling it. Perhaps also the comments and explanation might reflect such kind of usage? And perhaps then such an extension might be trigerred by a flag which don't even mention DEC. Eg -fveryvariadic-extensions ? Regards. -- Basile STARYNKEVITCH http://starynkevitch.net/Basile/ email: basile<at>starynkevitch<dot>net mobile: +33 6 8501 2359 8, rue de la Faiencerie, 92340 Bourg La Reine, France *** opinions {are only mine, sont seulement les miennes} ***
