New-style exception handling

[Larry Campbell]

The gcc 4.1 man page says:

       -fobjc-exceptions
           Enable syntactic support for structured exception  
handling in Objective-C,
           similar to what is offered by C++ and Java.  Currently,  
this option is only
           available in conjunction with the NeXT runtime on Mac OS  
X 10.3 and later.

However, gnustep-base seems to have some support for this; if you  
build gnustep-make with --enable-native-objc-exceptions, then small  
test programs I've written "seem to work" (with the gnu runtime on  
linux x86).

Does anyone know what the real story is here? It would be really nice  
to dispense with the crufty old setjmp/longjmp stuff -- in  
particular, with the need to declare certain variables volatile.  
(I've determined by experimentation that bugs due to undeclared  
volatility are fixed by switching to native exceptions.)