Re: [cfe-dev] LLVM / Clang 3.0 rc1 Binaries Available

[David Chisnall]

On 27 Oct 2011, at 09:14, Richard Frith-Macdonald wrote:

> Is this the compiler passing the wrong value, or possibly something wrong in 
> the objc library?

Neither - this is the correct behaviour.  That method doesn't exist, and trying 
to call it is supposed to throw an exception.  The problem is not that the 
exception is thrown, it is that it is not caught.

This means that either:

- There is a bug in libobjc2's exception handling, or
- One of your stack frames does not have unwind information.

One of the bug changes that LLVM 3.0 made over 2.9 was to emit .cfi* directives 
in the assembler, instead of emitting the unwind tables directly.  Do you get 
any warnings from the assembler about unknown directives when you compile?  Do 
simple @throw / @catch tests pass for you?  What about C++ exceptions 
(Sebastian - did you check that on OpenBSD?)

David

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