gh-122272: Guarantee specifiers %F and %C for datetime.strftime to be 0-padded (GH-122436)

1 files changed, 52 insertions, 0 deletions

diff --git a/configure b/configure
index c28c333..2c58af3 100755
--- a/configure
+++ b/configure
@@ -26196,6 +26196,58 @@ printf "%s\n" "#define Py_NORMALIZE_CENTURY 1" >>confdefs.h
 
 fi
 
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether C99-specific strftime specifiers are supported" >&5
+printf %s "checking whether C99-specific strftime specifiers are supported... " >&6; }
+if test ${ac_cv_strftime_c99_support+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+
+if test "$cross_compiling" = yes
+then :
+  ac_cv_strftime_c99_support=no
+else $as_nop
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#include <time.h>
+#include <string.h>
+
+int main(void)
+{
+  char full_date[11];
+  struct tm date = {
+    .tm_year = 0,
+    .tm_mon = 0,
+    .tm_mday = 1
+  };
+  if (strftime(full_date, sizeof(full_date), "%F", &date) && !strcmp(full_date, "1900-01-01")) {
+    return 0;
+  }
+  return 1;
+}
+
+_ACEOF
+if ac_fn_c_try_run "$LINENO"
+then :
+  ac_cv_strftime_c99_support=yes
+else $as_nop
+  ac_cv_strftime_c99_support=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_strftime_c99_support" >&5
+printf "%s\n" "$ac_cv_strftime_c99_support" >&6; }
+if test "$ac_cv_strftime_c99_support" = yes
+then
+
+printf "%s\n" "#define Py_STRFTIME_C99_SUPPORT 1" >>confdefs.h
+
+fi
+
 have_curses=no
 have_panel=no