[Bug libstdc++/78905] Add a macro to determine that the <regex> library is implemented

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78905

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Matt Clarkson from comment #2)
> Because wehen I compile with clang against the libstdc++ the problem will
> still occur and __GNUC__ will not be defined. This happens on any distro
> where GCC is the default but ships clang as an alternative compiler.

Not something which GCC supports directly.  You need to ask clang folks about
that :).

Anyways 4.9.x is no longer maintained; there will be no new releases after the
current release of 4.9.4 (which happened two years after the first release of
4.9.0).