From: Brahmajit Das <brahmajit.xyz@gmail.com>
Date: Wed, 31 May 2023 06:27:08 +0000
Subject: [PATCH] Fix build with clang 16

Especially on musl libc.

On musl libc with clang-16, the function pthread_kill can't be found, as its
only available if the FTM is enabled. Hence defining _GNU_SOURCE makes thie
function available.

Other than that this patch also renames the variable lock, to fix the following
error: ./Port-linux/dibbler-client.cpp:48:27: error: reference to 'lock' is
ambiguous. I'm exactly not sure what the errors are, but I'm guessing it's
related to CPP namespaces. Not sure either why its not reproducable under glibc
llvm.

Bug: https://bugs.gentoo.org/897944
Signed-off-by: Brahmajit Das <brahmajit.xyz@gmail.com>
--- a/Port-linux/dibbler-client.cpp
+++ b/Port-linux/dibbler-client.cpp
@@ -26,7 +26,7 @@ using namespace std;
 
 #define IF_RECONNECTED_DETECTED -1
 
-extern pthread_mutex_t lock;
+extern pthread_mutex_t plock;
 
 TDHCPClient* ptr = 0;
 
@@ -44,8 +44,8 @@ void signal_handler(int n) {
 #ifdef MOD_CLNT_CONFIRM
 void signal_handler_of_linkstate_change(int n) {
     Log(Notice) << "Network switch off event detected. initiating CONFIRM." << LogEnd;
-    pthread_mutex_lock(&lock);
-    pthread_mutex_unlock(&lock);
+    pthread_mutex_lock(&plock);
+    pthread_mutex_unlock(&plock);
 }
 #endif
 
--- a/Port-linux/lowlevel-linux-link-state.c
+++ b/Port-linux/lowlevel-linux-link-state.c
@@ -10,6 +10,7 @@
 #ifdef MOD_CLNT_CONFIRM
 
 #define __USE_UNIX98
+#define _GNU_SOURCE
 
 #include <stdio.h>
 #include <signal.h>
@@ -34,7 +35,7 @@ volatile int * notifier = 0;
 int isDone = 0;
 pthread_t parent_id;
 pthread_t ntid;
-pthread_mutex_t lock;
+pthread_mutex_t plock;
 
 struct state {
     int id;
@@ -86,9 +87,9 @@ void link_state_changed(int ifindex)
     {
 	if (changed_links->cnt<16)
 	    changed_links->ifindex[changed_links->cnt++] = ifindex;
-	pthread_mutex_lock(&lock);
+	pthread_mutex_lock(&plock);
 	*notifier = 1; /* notify that change has occured */
-	pthread_mutex_unlock(&lock);
+	pthread_mutex_unlock(&plock);
 	pthread_kill(parent_id,SIGUSR1);
     } else
     {
-- 
2.40.1