[issue1621] Do not assume signed integer overflow behavior

[Ismail Donmez]

Ismail Donmez added the comment:

-Wstrict-overflow=5 is not valid afaik its 1-3, 3 for most verbose also
you need a recent gcc 4.3 snapshot for best results, check your
distribution for gcc-snapshot package.

About the -Wall thing it seems to be a gcc bug, but for now workaround
is easy :-)

Regards,
ismail

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