[Bug libstdc++/99832] New: std::chrono::system_clock::to_time_t needs ABI tag for 32-bit time_t

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99832

            Bug ID: 99832
           Summary: std::chrono::system_clock::to_time_t needs ABI tag for
                    32-bit time_t
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: ABI
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

chrono::system_clock defines:

      static std::time_t
      to_time_t(const time_point& __t) noexcept

This is a non-template function and its mangled name does not depend on the
return type. The mangled name is:

_ZNSt6chrono3_V212system_clock9to_time_tERKNS_10time_pointIS1_NS_8durationIlSt5ratioILl1ELl1000000000EEEEEE

For a target that allows time_t to be either 32-bit or 64-bit, we need this
mangled name to reflect the type of time_t.