[Bug libstdc++/110739] std::format for chrono types compiles very slowly

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110739

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu.org
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2023-07-19

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 55579
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55579&action=edit
Instantiate less code for chrono formatters

           * include/bits/chrono_io.h (__formatter_chrono): Use
            if-constexpr to avoid instantiating function bodies for types
            that can never be used with those functions.

This patch helps a little bit, but less than I'd hoped it would.