[cfe-dev] A problem met during using -ftrapv

[peng li]

Hi David

I think the problem is not related to the return type. I have tested it 
again after I modified the return type to "long long", the same error 
still came out.

Seems that when those arithmetic operations are considered as the 64-bit 
operations, this error will occur.

I tested via following simple code:

   int64_t operand = -1;
   int64_t test = operand - 1;
   printf("test: %lld\n", test);

The same compilation error still occurred.


Regards

Peng

David Chisnall wrote:
> On 28 May 2010, at 08:28, peng li wrote:
>
>   
>> void overflow_handler(long long a, long long b, char c, char d) {
>>  printf("overflow occurs!\n");
>> }
>>
>> void (*__overflow_handler)(long long, long long, char, char) = overflow_handler;
>>     
>
>
> The return type of these two should be long long.  Not sure if this is related to your problem.  The return value from this function will be truncated and used as the result of the operation.
>
> David
>
> -- Sent from my PDP-11
>