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This ensures that the unused bits will be zero-initialized reliably, and so can be used later by assigning them values in formatter specializations. For example, formatters for std::chrono will need to use an extra bit for a boolean flag to optimize the conversions between locale encodings and UTF-8. Adding the 16-bit _M_reserved2 bit-field results in an increased size for targets that use 1- or 2-byte alignment for all integral types, e.g. cris-elf or m68k. Placing that member before the _M_width member adjusts the layout for all targets, but keeps all the bit-fields together. We can't make that change once C++20 support is ABI stable and non-experimental, so do it now before GCC 14 is released. The _M_fill data member already change from char to char32_t in r14-6991-g37a4c5c23a270c so _Spec is already incompatible with gcc-13 anyway. libstdc++-v3/ChangeLog: * include/std/format (__format::_Spec::_M_reserved): Define new bit-field members to reserve padding bits for future extensions.
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