K&R-style variadic functions

[Walter Bright]

On 7/16/2012 11:56 PM, Jacob Carlborg wrote:
> To my understanding this is legal C :
>
> int foo ();
>
> It's a K&R-style variadic functions, while their use is discouraged, they're
> still legal C.

Variadic functions, in order to work in C, need at least one parameter so that 
varargs can work.

   int foo();

declares a function with an unspecified parameter list, not a variadic one. It 
is specified by a definition somewhere:

   int foo(a,b)
   int a;
   int b;
   { ... }

somewhere.

If Dstep encounters the first declaration form, your options are to:

1. reject it (a perfectly reasonable approach)

2. treat it as:

     int foo(void);

I suggest option 2, which is what C++ does.