https://gcc.gnu.org/g:cc8c7e44145deb457dbe436cf8b5bd88da0a9ec3
commit r13-9120-gcc8c7e44145deb457dbe436cf8b5bd88da0a9ec3 Author: Jonathan Wakely <[email protected]> Date: Fri Sep 27 16:54:31 2024 +0100 libstdc++: Tweak %c formatting for chrono types libstdc++-v3/ChangeLog: * include/bits/chrono_io.h (__formatter_chrono::_M_c): Add [[unlikely]] attribute to condition for missing %c format in locale. Use %T instead of %H:%M:%S in fallback. (cherry picked from commit ce89d2f3170e0d6474cee2c5cb9d478426a5b2f6) Diff: --- libstdc++-v3/include/bits/chrono_io.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libstdc++-v3/include/bits/chrono_io.h b/libstdc++-v3/include/bits/chrono_io.h index 37ede63a53eb..db46bfc68e87 100644 --- a/libstdc++-v3/include/bits/chrono_io.h +++ b/libstdc++-v3/include/bits/chrono_io.h @@ -794,8 +794,8 @@ namespace __format const _CharT* __formats[2]; __tp._M_date_time_formats(__formats); const _CharT* __rep = __formats[__mod]; - if (!*__rep) - __rep = _GLIBCXX_WIDEN("%a %b %e %H:%M:%S %Y"); + if (!*__rep) [[unlikely]] + __rep = _GLIBCXX_WIDEN("%a %b %e %T %Y"); basic_string<_CharT> __fmt(_S_empty_spec); __fmt.insert(1u, 1u, _S_colon); __fmt.insert(2u, __rep);
