signed is undefined and has been since 1992 (in GCC)

[Falk Hueffner]

"Joseph S. Myers" <joseph@codesourcery.com> writes:

> Does -ftrapv ever take advantage of trapping instructions where the
> hardware has them available?

Yes, for example Alpha.

> Does anyone make substantial use of -ftrapv in production

There are rarely bug reports about it; for example pointer difference
with odd sized objects was broken for years, and reported only twice
or so.

-- 
	Falk