[cfe-dev] "Blocks" in Clang (aka closures)

[steve naroff]

On Dec 11, 2008, at 7:24 PM, jp bonn wrote:

> Eli Friedman wrote:
>> On Tue, Dec 9, 2008 at 4:11 PM, jp bonn <jp at jpbonn.com> wrote:
>>
>>> Chris Lattner wrote:
>>>
>>>> Hi All,
>>>>
>>>> Steve has started working on an implementation of a language  
>>>> feature
>>>> named 'Blocks'.  The back story on this was that it was  
>>>> prototyped in
>>>> an private Clang fork (because it is much easier to experiment with
>>>> clang than with GCC), then implemented in GCC (where it evolved a
>>>> lot), and now we're re-implementing it in Clang.  The language  
>>>> feature
>>>> is already supported by mainline llvm-gcc, but we don't have up-to-
>>>> date documentation for it.  When that documentation is updated, it
>>>> will definitely be checked into the main clang repo (in clang/ 
>>>> docs).
>>>>
>>> I noticed some commits for "blocks" support in Clang but the
>>> documentation hasn't been committed yet.  Are blocks supported in  
>>> Clang?
>>>
>>
>> If I recall correctly, the parsing and semantic analysis are  
>> basically
>> complete, and there's the -rewrite-blocks option to clang to  
>> transform
>> C code with blocks into equivalent code without them, but there isn't
>> any native CodeGen support yet.
>>
>> -Eli
>>
> Are the examples supposed to run using llvm-gcc on OSX?  I'm getting
> undefined symbols e.g. __NSConcreteStackBlock using the llvm-gcc
> testsuite. I'm assuming that's part of the "small runtime"
> and it's not out yet.
>

Your assumption is correct.

snaroff

> JP
>
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