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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++/107901] std::format isn't usable on 16-bit targets
Date: Mon, 28 Nov 2022 21:11:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107901

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-11-28
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This allows the file to be compiled:

--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -3035,12 +3035,21 @@ namespace __format
            case _Arg_ull:
              return std::forward<_Visitor>(__vis)(_M_val._M_ull);
            case _Arg_flt:
-             return std::forward<_Visitor>(__vis)(_M_val._M_flt);
+             if constexpr (__formattable_float<float>)
+               return std::forward<_Visitor>(__vis)(_M_val._M_flt);
+             else
+               return std::forward<_Visitor>(__vis)(_M_val._M_none);
            case _Arg_dbl:
-             return std::forward<_Visitor>(__vis)(_M_val._M_dbl);
+             if constexpr (__formattable_float<double>)
+               return std::forward<_Visitor>(__vis)(_M_val._M_dbl);
+             else
+               return std::forward<_Visitor>(__vis)(_M_val._M_none);
 #ifndef _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT
            case _Arg_ldbl:
-             return std::forward<_Visitor>(__vis)(_M_val._M_ldbl);
+             if constexpr (__formattable_float<long double>)
+               return std::forward<_Visitor>(__vis)(_M_val._M_ldbl);
+             else
+               return std::forward<_Visitor>(__vis)(_M_val._M_none);
 #else
            case _Arg_f128:
              return std::forward<_Visitor>(__vis)(_M_val._M_f128);=