[LLVMdev] Exception handling with the LLVM makefile system

[Pablo Barrio]

On 05/16/2011 05:11 PM, Sebastian Redl wrote:
> On 16.05.2011, at 08:44, Pablo Barrio wrote:
>
>> Hi all,
>>
>> I'm having trouble when trying to reuse some functions that use
>> Boost::Exception into my LLVM-based application. As far as I know, LLVM
>> turns off Exception handling (apparently for performance reasons), so I
>> get the following link-time error in a few places:
>>
>> "undefined reference to `boost::throw_exception(std::exception const&)"
>>
>> When I compile the external code from outside the LLVM Makefile system,
>> everything goes well. Is it possible to enable exception handling for
>> some parts of the compilation? Just like turning on RTTI with
>> "REQUIRES_RTTI=1" ? Removing exception handling from the functions is
>> not an option, since I would have to tweak the Boost library internals.
> Whatever the LLVM side of things, boost::throw_exception is a function that you, the user, have to implement when disabling exceptions. It's basically the "I want to throw an exception, so what should I really do?" callback.
>
> Sebastian
That's right, I wrote a throw_exception() function with the sole purpose 
of avoiding error messages. However, I'm not really an expert on 
exception handling: the function just prints out an error message. 
boost::throw_exception allows handling exceptions just as when using the 
C++ builtin "throw" features. The selection of either method is done by 
defining BOOST_NO_EXCEPTIONS. I'd like to use the standard exceptions 
instead of making my own. Do you think that's possible? Is it possible 
(and correct) to turn on exception handling with LLVM?

-- 
Pablo Barrio
Dpto. Ing. Electrónica - E.T.S.I. Telecomunicación
Despacho C-203
Avda. Complutense s/n, 28040 Madrid
Tlf. 915495700 ext. 4234
@: pbarrio at die.upm.es