[cfe-dev] blocks/lambdas in clang

Blaine Garst blaine at apple.com
Tue Jan 12 13:26:50 PST 2010

The compiler initializes the first word of every block to one of two symbols (the other being _NSConcreteStackBlock), that being one of them, so as to enable Objective-C treating blocks as objects if and when the objc runtime is loaded.  The blocks runtime for the most part ignores these values until such a time.  A block copy operation will use another symbol, so in total I think you'll need _NSConcreteMallocBlock also.

On Jan 12, 2010, at 11:15 AM, david raila wrote:

> Trying blocks on a x64 linux gives undefined reference to 
> `_NSConcreteGlobalBlock', am I missing a library
> or something?
> Alternatively, what are the plans/timetable for an implementation of 
> C++0x lambdas in clang?
> Thanks.
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