[cfe-dev] clang does not support extern for OpenCL

[Jordan Rose]

On Apr 15, 2013, at 11:10 , Tanya Lattner <lattner at apple.com> wrote:

> 
> On Apr 15, 2013, at 10:56 AM, Jordan Rose <jordan_rose at apple.com> wrote:
> 
>> 
>> On Apr 15, 2013, at 10:53 , Tanya Lattner <lattner at apple.com> wrote:
>> 
>>> 
>>> On Apr 15, 2013, at 10:44 AM, Jordan Rose <jordan_rose at apple.com> wrote:
>>> 
>>>> I'm not familiar with the OpenCL part of the compiler, but I'm pretty sure you're not supposed to invoke -cc1 mode directly, just like the C compiler. The right way to do this is with the usual -std option:
>>>> 
>>>> clang -std=cl1.2 tmp.cl
>>>> 
>>>> This ensures that all the other driver-specified options get handled appropriately.
>>> 
>>> I agree that you shouldn't use -cc1, but -cl-std= should be a driver level option. If not, then it should be fixed.
>> 
>> It seems it isn't, but why not -std? We already use this to refer to both the C and C++ standards.
> 
> I totally agree with you, but I did not write the OpenCL Spec and I have no idea why they decided they needed another std option. 

Ah, I didn't realize the command-line interface was specified by the standard. My bad.

> Its not a high priority to me to change it to be a driver level option, but someone else might complain (and they can fix it).


Since we are unlikely to have a separate openclc driver tool anytime soon, this does seem like the right way to go.

Thanks for the explanation,
Jordan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20130415/e412cede/attachment.html>