[cfe-dev] function prototypes / definition

[Douglas Gregor]

On Nov 2, 2010, at 3:38 PM, JP wrote:

> In the following example "old-style" definition of f, "f (p0, p1) Point 
> p0, p1; ..." results in the following LLVM assembly:
> 
> call void (...)* bitcast (void (i64, i64, i64, i64)* @f to void 
> (...)*)(i64 %1, i64 %3, i64 %5, i64 %7)
> 
> whereas if f is defined as "f (Point p0, Point p1) ..." the assembly is:
> 
> call void @f(i64 %1, i64 %3, i64 %5, i64 %7)
> 
> A couple questions:
> 1) How can I warn about or prevent the old-style definition from 
> compiling? -Wold-style-definition has no effect.

I don't think we have an implementation of this warning. We just swallow the warning flag. Patches welcome! ;)

> 2) I assume the vararg call to f is expected.

IIRC, yes, that's how K&R function definitions work if there is no prototype visible.

	- Doug