https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120315

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

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

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> >I got undefined behavior (segfault, missing output or exceptions) when using 
> >a gcc 14 compiled library with a gcc 15 compiled executable.
> 
> 
> Forward compatibility is not guaranteed; only backwards.

No, neither direction is supported for C++20 yet.

std::format is not ABI stable, and neither are any other C++20 features.

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