Which libraries do you need to link against for a clang program using blocks?

Clang doesn't yet provide an easy way to use blocks on platforms that don't have built-in operating system support (e.g. , SnowLeopard). You can find some more information on the libdispatch project here: http://libdispatch.macosforge.org and on the compiler-rt project (which provides the blocks runtime) here: http://compiler-rt.llvm.org but this is not yet well packaged for Clang end users.

Use the instructions at mackyle.github.com/blocksruntime/ to build a libBlocksRuntime. A library that you can link with.

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