File libstrophe-0.14.0-gcc15.patch of Package libstrophe

From dfb3e868248d86fc0f5553dffbb6f7c367c3c383 Mon Sep 17 00:00:00 2001
From: Steffen Jaeckel <s@jaeckel.eu>
Date: Wed, 26 Mar 2025 14:14:19 +0100
Subject: [PATCH] Use `void*` to store function pointer when compiled as C23.

[0] decided that `rettype (*foo)();` must now be interpreted as
`rettype (*foo)(void);`. Luckily it also allows now to store function
pointers in a `void*` (c.f. Ch. J.5.7).

[0]: https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3096.pdf

Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>
---
 src/common.h  | 7 ++++++-
 src/handler.c | 2 --
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/common.h b/src/common.h
index 75134bea..c387c0fe 100644
--- a/src/common.h
+++ b/src/common.h
@@ -30,12 +30,17 @@
 #include "snprintf.h"
 
 /** handlers **/
+#if (__STDC_VERSION__ >= 202000L)
+typedef void* xmpp_void_handler;
+#else
+typedef int (*xmpp_void_handler)();
+#endif
 
 typedef struct _xmpp_handlist_t xmpp_handlist_t;
 struct _xmpp_handlist_t {
     /* common members */
     int user_handler;
-    int (*handler)();
+    xmpp_void_handler handler;
     void *userdata;
     int enabled; /* handlers are added disabled and enabled after the
                   * handler chain is processed to prevent stanzas from
diff --git a/src/handler.c b/src/handler.c
index 1c9bf9f7..05772522 100644
--- a/src/handler.c
+++ b/src/handler.c
@@ -25,8 +25,6 @@
 #include "common.h"
 #include "ostypes.h"
 
-typedef int (*xmpp_void_handler)();
-
 /* Remove item from the list pointed by head, but don't free it.
  * There can be a situation when user's handler deletes another handler which
  * is the previous in the list. handler_fire_stanza() and handler_fire_timed()