https://bugs.gentoo.org/926349
https://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commit;h=67c298c36f6

From 67c298c36f69b6906840b7584be06b7b5f33f829 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 16 Jan 2024 17:21:08 -0800
Subject: [PATCH] posixtm: pacify clang 18
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Problem reported by Khem Raj in:
https://lists.gnu.org/r/bug-gnulib/2024-01/msg00045.html
* lib/posixtm.c (posixtime): Pacify clang 18 by converting bool to int.
Arguably this is a bug in draft C2x, since the non-pointer args to
ckd_add should promote just like any other expressions do;
but that’s not clang’s fault.
--- a/lib/posixtm.c
+++ b/lib/posixtm.c
@@ -191,7 +191,7 @@ posixtime (time_t *p, const char *s, unsigned int syntax_bits)
              | (tm0.tm_min ^ tm1.tm_min)
              | (tm0.tm_sec ^ tm1.tm_sec)))
         {
-          if (ckd_add (&t, t, leapsec))
+          if (ckd_add (&t, t, +leapsec))
             return false;
           *p = t;
           return true;
-- 
2.17.1