[fpc-devel] MacOSX: EXC_ARITHMETIC in PerformHIConversion

Marc Weustink marc.weustink at cuperus.nl
Mon Aug 15 18:58:06 CEST 2005

Jonas Maebe wrote:
> On 15 Aug 2005, at 18:25, Marc Weustink wrote:
>>>> Are these exceptions by default disabled by gcc ?
>>> The FPC runtime explicitly turns them on by default (since they  are  
>>> required for detecting errors), while libc doesn't. It is  
>>> independent of the compiler used.
>> So, if I understand it correct, you wont get a aritmic exeption in  
>> FPC anymore when this is turned on ?
> The "invalid fpu operation" exceptions are turned on in the FPC  system 
> unit initialisation code. If you add the code I posted, they  are turned 
> off again and so you won't get them (not due to buggy code  in the 
> Carbon framework and not anywhere else either).

That last part I was already afraid of. This would mean that I have to 
add it to the lcl-carbon initialization code and that no lcp app based 
on carbon would get the exception. Not the nices solution if you ask me.
I'll try to find a way to wrap only the failing call/event.

>> (and since it is off by default, what are the chances that it get  
>> fixed ?)
> In the Carbon framework? Reasonable if many people report a bug to  
> Apple with a C program that crashes. At least one person has already  
> done that. The main problem is that this problem does not occur on  all 
> systems. For example, it does not happen on my iBook nor on my G5.

Oh, fun.... :( also not my sample ?)


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