C2x adds strftime %OB and %Ob formats, for alternative forms of month
names (for mainly Slavic languages where a month name on its own is
declined differently from a month name together with a date within
that month). This patch adds corresponding format checking support.
(glibc support for these formats was added in glibc 2.27.)
Bootstrapped with no regressions on x86_64-pc-linux-gnu.
PR c/82752
gcc/c-family:
* c-format.c (C_STD_VER): Handle C2x.
(C_STD_NAME): Likewise.
(strftime_flag_specs): Add 'O' modifier with 'p' flag.
(time_char_table): Use separate entry for 'B' and 'b', with 'O'
modifier allowed and 'p' flag.
* c-format.h (enum format_std_version): Add STD_C2X.
(struct format_char_info): Mention 'p' in comment on flags2.
gcc/testsuite:
* gcc.dg/format/c2x-strftime-1.c: New test.
From-SVN: r276605
