Re: [Qemu-devel] [RFC, PATCH] Add -Wstrict-prototypes, maybe later -Wmissing-prototypes

[Daniel Jacobowitz]

On Mon, Aug 11, 2008 at 02:22:16PM -0500, Anthony Liguori wrote:
> But this tosses a warning since void (*)() is deprecated.  So, if we use:
>
> void dispatch(void *func, int n_args, void *args)
>
> It'll work just like it did before.

Just for the record: while you're correct this will work on mainstream
systems (you've been saying modern, which is not accurate), it is not
valid C.  The C standard only permits conversions between pointers to
different object types, or between pointers to different function
types.  Pointers can also be converted to integers but "the result
need not be in the range of values of any integer type".

GCC will even warn about it:
  ISO C forbids conversion of object pointer to function pointer type

-- 
Daniel Jacobowitz
CodeSourcery