Re: Can't mix native exceptions and ObjC++

[Andrew Pinski]

Sent from my iPhone

On Mar 13, 2010, at 5:17 AM, David Chisnall <theraven@sucs.org> wrote:

> On 13 Mar 2010, at 10:12, Isamu Mogi wrote:
>
> > Hi
> >
> > This is a bug in GCC.
> >
> > obj-c++.dg/try-catch-[29].mm (objc exceptions are broken) fails  
> > with the GNU
> > Runtime
> > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23616
>
> This is a compiler bug, not a runtime bug.  Objective-C++ is  
> unmaintained in GCC and is known to be broken.  It is not shipped by  
> default on a number of platforms for this reason.  If you use it and  
> stuff breaks, don't expect any sympathy.  You should be surprised if  
> it works at all for any code, not that it breaks for some.

I think when says with the gnu runtime, he means when compiling for  
that runtime.  That is what I had meant in the bug report too. :).



> I can confirm that this test case works correctly with clang.  I  
> don't believe that you can catch both ObjC and C++ exceptions in the  
> same stack frame yet, but catching just one works correctly (it's a  
> bit tricky catching both; you'd need another personality function  
> that can handle the unwinding stuff).
>
> > Quick and dirty fix here:
> >
> > #define NS_HANDLER     } @catch (id)  
> > {                                    \
> >                          NSException* localException  
> > =                  \
> >                              [NSException  
> > exceptionWithName:@"Unknown"  \
> >                                                       
> > reason:@"Unknown"  \
> >                                                     
> > userInfo:nil];       \
>
>
> This 'fix' prevents you from catching any Objective-C exceptions in  
> ObjC++ code.  It's better to describe it as 'a different kind of  
> complete breakage' than a 'fix.'
>
> David
>
> -- Sent from my PDP-11
>
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