On Monday 03 October 2011 21:23:43, Joseph S. Myers wrote: > On Mon, 3 Oct 2011, Douglas Rupp wrote: > > > On 9/30/2011 8:19 AM, Joseph S. Myers wrote: > > > On Fri, 30 Sep 2011, Tristan Gingold wrote: > > > > > > > If you prefer a target hook, I'm fine with that. I will write such a > > > > patch. > > > > > > > > I don't think it must be restricted to system headers, as it is possible > > > > that the user 'imports' such a function (and define it in one of VMS > > > > favorite languages such as macro-32 or bliss). > > > If it's not restricted to system headers, then probably the option is > > > better than the target hook. > > > > > I'm not sure I understand the reasoning here. This seems fairly VMS > > specific > > so what is the downside for a target hook and user written headers? > > The language accepted by the compiler in the user's source code (as > opposed to in system headers) shouldn't depend on the target except for > certain well-defined areas such as target attributes and built-in > functions; behaving the same across different systems is an important > feature of GCC. This isn't one of those areas of target-dependence; it's > generic syntax rather than e.g. exploiting a particular processor feature.
So I take it a `void foo(...);' declaration to mean the same thing as an unprototyped `void foo();'? (If so, I think that should be explicit in the documentation). That is, decc system headers are probably declaring with: extern void foo(...); and then the function is defined somewhere with, say: void foo(int a, int b, void *c) { ... } Do we need to consider ABIs that have calling conventions that treat unprototyped and varargs functions differently? (is there any?) -- Pedro Alves