[cfe-commits] Explicit type cast of zero to OpenCL event_t type

[Richard Smith]

On Thu, May 2, 2013 at 3:54 PM, jingu kang <jaykang10 at gmail.com> wrote:

> Hi all,
>
> I have a question. Clang allows implicit type cast of zero to OpenCL
> event_t type to support OpenCL async_work_group_copy() function. But
> explicit type cast generates the error. Could someone explain about this
> why clang prevent explicit type cast of zero to OpenCL event_t type? I
> think OpenCL spec does not mention about implicit or explicit type cast to
> event_t type. I have attached the simple patch to support explicit type
> cast on the assumption that it is needed.
>

The originally-proposed patch to add event_t was more restrictive, not even
allowing implicit conversions from 0 to event_t except for function
parameters:

http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20121217/070012.html

... but it looks like the restriction was not completely removed, and still
exists for explicit conversions?

The OpenCL specification is hopeless when it comes to defining the event_t
type, so I have no idea what the right behavior is. Perhaps someone with
more familiarity with OpenCL can guess what the standard intended?
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