https://github.com/libical/libical/commit/d67034b31cebe0db3ca65342813336b123921a15
https://github.com/libical/libical/issues/603
https://bugs.gentoo.org/876625

From: Allen Winter <allen.winter@kdab.com>
Date: Fri, 7 Oct 2022 09:43:32 -0400
Subject: [PATCH] fix problem found with gcc fortify builds

fixes: #603
--- a/src/libical/icaltz-util.c
+++ b/src/libical/icaltz-util.c
@@ -732,7 +732,7 @@ icalcomponent *icaltzutil_fetch_timezone(const char *location)
     for (i = 0; i < num_trans; i++) {
         int by_day = 0;
         time_t start;
-        enum icalrecurrencetype_weekday dow;
+        enum icalrecurrencetype_weekday dow = ICAL_NO_WEEKDAY;
 
         prev_idx = idx;
         idx = trans_idx[i];
--- a/src/libicalss/icalbdbset.c
+++ b/src/libicalss/icalbdbset.c
@@ -529,7 +529,7 @@ int icalbdbset_get_key(DBC *dbcp, DBT *key, DBT *data)
 int icalbdbset_delete(DB *dbp, DBT *key)
 {
     DB_TXN *tid;
-    int ret;
+    int ret = 0;
     int done = 0;
     int retry = 0;
 
--- a/src/test/regression.c
+++ b/src/test/regression.c
@@ -2322,7 +2322,7 @@ void test_fblist()
         char *strp = out_str;
 
         for (i = 0; foo[i] != -1; i++) {
-            snprintf(strp, 79, "%1d", foo[i]);
+            snprintf(strp, 79-i, "%1d", foo[i]);
             strp++;
         }
         str_is("Checking freebusy validity", out_str, "1121110");