[Bug libstdc++/86130] Expect SIGSEGV but program just silently exits

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86130

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-07-10

--- Comment #18 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #13)
> I think there would need to be a period of deprecation and an optional
> assertion enabled by _GLIBCXX_ASSERTIONS before we can do that (assuming we
> want to).

As I said in the PR 109891 dup, _GLIBCXX_DEBUG_PEDANTIC exists for precisely
this kind of case:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/debug_mode_semantics.html

So let's add that for now.