https://bugs.gentoo.org/764713
https://github.com/dovecot/core/commit/2cc1feca9087651902a5ea3cda021c8a0b3217ce.patch

From 2cc1feca9087651902a5ea3cda021c8a0b3217ce Mon Sep 17 00:00:00 2001
From: Paul Howarth <paul@city-fan.org>
Date: Mon, 4 Jan 2021 16:31:03 +0000
Subject: [PATCH] lib: Fix timeval_cmp_margin for 32-bit systems

The test suite compares times with seconds values of -INT_MAX and
INT_MAX. The result of this comparison does not fit in a value of
type int and so the test suite fails on 32-bit systems where time_t
is an int. To fix this, calculations on seconds values are done
using long long integers.

Broken by 16ab5542
---
 src/lib/time-util.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/lib/time-util.c b/src/lib/time-util.c
index 294bb02310..3f4cd01c9e 100644
--- a/src/lib/time-util.c
+++ b/src/lib/time-util.c
@@ -38,21 +38,23 @@ int timeval_cmp(const struct timeval *tv1, const struct timeval *tv2)
 int timeval_cmp_margin(const struct timeval *tv1, const struct timeval *tv2,
 	unsigned int usec_margin)
 {
-	long long usecs_diff;
+	long long secs_diff, usecs_diff;
 	int sec_margin, ret;
 
 	if (tv1->tv_sec < tv2->tv_sec) {
 		sec_margin = ((int)usec_margin / 1000000) + 1;
-		if ((tv2->tv_sec - tv1->tv_sec) > sec_margin)
+		secs_diff = (long long)tv2->tv_sec - (long long)tv1->tv_sec;
+		if (secs_diff > sec_margin)
 			return -1;
-		usecs_diff = (tv2->tv_sec - tv1->tv_sec) * 1000000LL +
+		usecs_diff = secs_diff * 1000000LL +
 			(tv2->tv_usec - tv1->tv_usec);
 		ret = -1;
 	} else if (tv1->tv_sec > tv2->tv_sec) {
 		sec_margin = ((int)usec_margin / 1000000) + 1;
-		if ((tv1->tv_sec - tv2->tv_sec) > sec_margin)
+		secs_diff = (long long)tv1->tv_sec - (long long)tv2->tv_sec;
+		if (secs_diff > sec_margin)
 			return 1;
-		usecs_diff = (tv1->tv_sec - tv2->tv_sec) * 1000000LL +
+		usecs_diff = secs_diff * 1000000LL +
 			(tv1->tv_usec - tv2->tv_usec);
 		ret = 1;
 	} else if (tv1->tv_usec < tv2->tv_usec) {