how to make gcc warn about arithmetic signed overflow

[Andrew Haley]

On 09/26/2013 09:29 AM, Vincent Lefevre wrote:
> On 2013-09-25 22:29:58 -0400, James K. Lowden wrote:
>> You mean that a naïve rendering of the source code implies an overflow
>> where none might exist in the actual emitted object code.  And,
>> presumably, the converse: that even if the source is written such that
>> there logically can't be an overflow, the compiler might render object
>> code that does.
> 
> The converse is forbidden.

You'll find it hard to justify that by any language in the standard.

Andrew.