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m4: Require signed time_t

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An unsigned time_t is not forbidden by POSIX, but it is essentially
nonexistent on POSIX systems. Requiring a signed time_t simplifies
overflow checks in time arithmetic.
This commit is contained in:
Aki Tuomi
2026-07-14 07:12:02 +00:00
parent 9eb67bd69c
commit 7cedd93c4e
1 changed files with 4 additions and 17 deletions
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21
m4/time_t.m4
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@@ -13,28 +13,15 @@ AC_DEFUN([DOVECOT_TIME_T], [
timet_len="ll"
i_cv_signed_time_t=yes
;;
"unsigned int")
timet_len=""
i_cv_signed_time_t=no
;;
"unsigned long")
timet_len="l"
i_cv_signed_time_t=no
;;
"unsigned long long")
timet_len="ll"
i_cv_signed_time_t=no
"unsigned int"|"unsigned long"|"unsigned long long")
AC_MSG_ERROR([Dovecot requires a signed time_t])
;;
*)
AC_MSG_ERROR([Unsupported time_t type])
;;
esac
if test $i_cv_signed_time_t = yes; then
AC_DEFINE(TIME_T_SIGNED,, [Define if your time_t is signed])
timet_d_fmt="$timet_len"d
else
timet_d_fmt="$timet_len"u
fi
AC_DEFINE(TIME_T_SIGNED,, [Define if your time_t is signed])
timet_d_fmt="$timet_len"d
timet_x_fmt="$timet_len"x
AC_DEFINE_UNQUOTED(PRIdTIME_T, "$timet_d_fmt", [printf() fmt for dec time_t])