[Bug c++/82309] Compiled binary received SIGSEGV when -g

["sergio_nsk at yahoo dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82309

--- Comment #6 from Sergey Markelov <sergio_nsk at yahoo dot de> ---
(In reply to Andrew Pinski from comment #5)
> The temp variable goes out if scope is the result of v0 + v1. And not the
> auto.  IIRC -fsanitize=undefined will catch this.

Yes, I agree, I understood it from your previous comment. Sorry, I was mistaken
with the extra minimized bug.cpp, so you can not see Vector constructor from
'VectorSum'.

'auto sum = v0 + v1 + v2' deduces the type VectorSum<VectorSum<Vector, Vector>
Vector> with a reference to a temp variable of the type VectorSum<Vector,
Vector>.

'Vector sum = v0 + v1 + v2' sums and copies values during the temp scope is
valid.

Unfortunately -fsanitize=undefined does not catch this. Thank you for your
help.