https://bugs.gentoo.org/944381
https://github.com/esnet/iperf/pull/1805

From beadb59b90e8d3339d31f9f15525108072fde135 Mon Sep 17 00:00:00 2001
From: Rudi Heitbaum <rudi@heitbaum.com>
Date: Mon, 9 Dec 2024 10:13:02 +0000
Subject: [PATCH] fix build with gcc-15

--- a/src/iperf_api.c
+++ b/src/iperf_api.c
@@ -603,25 +603,25 @@ iperf_set_mapped_v4(struct iperf_test *ipt, const int val)
 }
 
 void 
-iperf_set_on_new_stream_callback(struct iperf_test* ipt, void (*callback)())
+iperf_set_on_new_stream_callback(struct iperf_test* ipt, void (*callback)(struct iperf_stream *))
 {
         ipt->on_new_stream = callback;
 }
 
 void 
-iperf_set_on_test_start_callback(struct iperf_test* ipt, void (*callback)())
+iperf_set_on_test_start_callback(struct iperf_test* ipt, void (*callback)(struct iperf_test *))
 {
         ipt->on_test_start = callback;
 }
 
 void 
-iperf_set_on_test_connect_callback(struct iperf_test* ipt, void (*callback)())
+iperf_set_on_test_connect_callback(struct iperf_test* ipt, void (*callback)(struct iperf_test *))
 {
         ipt->on_connect = callback;
 }
 
 void 
-iperf_set_on_test_finish_callback(struct iperf_test* ipt, void (*callback)())
+iperf_set_on_test_finish_callback(struct iperf_test* ipt, void (*callback)(struct iperf_test *))
 {
         ipt->on_test_finish = callback;
 }
--- a/src/iperf_api.h
+++ b/src/iperf_api.h
@@ -213,10 +213,10 @@ void    iperf_set_dont_fragment( struct iperf_test* ipt, int dont_fragment );
 void    iperf_set_test_congestion_control(struct iperf_test* ipt, char* cc);
 void    iperf_set_test_mss(struct iperf_test* ipt, int mss);
 void    iperf_set_mapped_v4(struct iperf_test* ipt, const int val);
-void    iperf_set_on_new_stream_callback(struct iperf_test* ipt, void (*callback)());
-void    iperf_set_on_test_start_callback(struct iperf_test* ipt, void (*callback)());
-void    iperf_set_on_test_connect_callback(struct iperf_test* ipt, void (*callback)());
-void    iperf_set_on_test_finish_callback(struct iperf_test* ipt, void (*callback)());
+void    iperf_set_on_new_stream_callback(struct iperf_test* ipt, void (*callback)(struct iperf_stream *));
+void    iperf_set_on_test_start_callback(struct iperf_test* ipt, void (*callback)(struct iperf_test *));
+void    iperf_set_on_test_connect_callback(struct iperf_test* ipt, void (*callback)(struct iperf_test *));
+void    iperf_set_on_test_finish_callback(struct iperf_test* ipt, void (*callback)(struct iperf_test *));
 
 #if defined(HAVE_SSL)
 void    iperf_set_test_client_username(struct iperf_test *ipt, const char *client_username);