https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120648
--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-15 branch has been updated by Tomasz Kaminski <tkami...@gcc.gnu.org>: https://gcc.gnu.org/g:fc36a902340a3a6dcfbe84c7d62c96268d413dc2 commit r15-9895-gfc36a902340a3a6dcfbe84c7d62c96268d413dc2 Author: Tomasz KamiÅski <tkami...@redhat.com> Date: Fri Jun 13 13:28:30 2025 +0200 libstdc++: Format %r, %x and %X using locale's time_put facet [PR120648] Similarly to issue reported for %c in PR117214, the format string for locale specific time (%r, %X) and date (%x) representations may contain specifiers not accepted by chrono-spec, leading to exception being thrown. This happened for following conversion specifier and locale combinations: * %r, %X for aa_DJ.UTF-8, ar_SA.UTF-8 * %x for ca_AD.UTF-8, my_MM.UTF-8 This fix follows approach from r15-8490-gc24a1d5, and uses time_put to emit localized date format. The existing _M_c is reworked to handle all locale dependent conversion specifies, by accepting them as argument. It is also renamed to _M_c_r_x_X. PR libstdc++/120648 libstdc++-v3/ChangeLog: * include/bits/chrono_io.h (__formatter_chrono::_M_format_to): Handle %c, %r, %x and %X by passing them to _M_c_r_x_X. (__formatter_chrono::_M_c_r_x_X): Reworked from _M_c. (__formatter_chrono::_M_c): Renamed into above. (__formatter_chrono::_M_r, __formatter_chrono::_M_x) (__formatter_chrono::_M_X): Removed. * testsuite/std/time/format/pr117214.cc: New tests for %r, %x, %X with date, time and durations. (cherry picked from commit 33e3139f5df09a13b8b13844d8e21ef3bb4d618e)
