[Bug c++/70246] Spurious -Wmaybe-uninitialized warnings with -O1

["michael at jarvis dot net" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70246

--- Comment #4 from Mike Jarvis <michael at jarvis dot net> ---
Created attachment 37984
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37984&action=edit
An alternate source that uses a custom Complex class

OK, here is a version that rolls its own Complex class, rather than using the
standard library's complex<double>.  I stripped out the parts of that that
aren't relevant for this, so hopefully this is small enough for you.

A possible clue is that the warning goes away if Complex is implemented in
terms of double _x and double _y (as the normal template version of
std::complex does) rather than __complex__ double _z (as the specialization
std::complex<double> does).