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Re: [PATCH][4.3] Deprecate -ftrapv


* Florian Weimer:

> * Richard Kenner:
>
>>> int f(int a, int b) { return 0 * (a + b); }
>>> 
>>> get the potentially trapping arithmetic folded away.  If -ftrapv is to 
>>> have properly defined semantics, those must include trapping if (a + b) 
>>> overflows in the above code.
>>
>> Why?  Is there any language that requires such semantics?
>
> Standard ML.  I don't think there is a GCC front end (and it's not
> likely that one will be feasible, at least until GCC supports a fitting
> garbage collector).

Oh, and a less obscure example is C# (Section 14.5.13 in ECMA-334, 4th
edition, June 2006).


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