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

[David Chisnall]

P.S.  Please can you check that -fexceptions is being passed to clang.  
-fobjc-exceptions doesn't seem to do anything in 3.0 (I thought it implied 
-fexceptions in 2.9, but I could be wrong).  If this is the problem, then it's 
an easy fix.  

David

On 27 Oct 2011, at 12:33, David Chisnall wrote:

> 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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