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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/112832] [std::format] Broken non-SFINAE-friendly
 `set_debug_format()` for `const char *` formatter
Date: Mon, 04 Dec 2023 11:36:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112832

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-12-04
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu=
.org
             Status|UNCONFIRMED                 |ASSIGNED
   Target Milestone|---                         |13.3

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Egor from comment #0)
> GCC doesn't seem to implement `{:?}` debug format for strings yet.

Correct, see PR 109162

> Yet for some reason `std::formatter<const char *>` has a
> `set_debug_format()` function, which causes a hard error when used (isn't
> SFINAE-friendly).

The error has nothing to do with it being SFINAE-friendly or not.

> `set_debug_format()` should be SFINAE-friendly, to allow the user to call=
 it
> conditionally when available.

No, it should just not exist yet.=