Turning on optimizations borg my programs

[Cedric Roux]

M.C.A. (Marco) Devillers wrote:
> libffi calls. It may be that the pointer arithmetic is uncleanly
> defined/optimized away?

maybe aliasing issues?

try -fno-strict-aliasing
(I don't know if it works with -O3)

so maybe try -fstrict-aliasing without -O3 and see if
your code then fails.

see gcc man, dig for "strict-aliasing," there is some
information on this issue.