only define _GNU_SOURCE once

core/amci/amci.h

@@ -36,7 +36,9 @@ extern "C" {
 #endif
 
 #ifdef __linux
-#define _GNU_SOURCE
+# ifndef _GNU_SOURCE
+#  define _GNU_SOURCE
+# endif
 #endif
 #include <stdio.h>
 

core/log.h

@@ -67,7 +67,9 @@ enum Log_Level {
 #endif
 
 #ifdef __linux
-# define _GNU_SOURCE
+# ifndef _GNU_SOURCE
+#  define _GNU_SOURCE
+# endif
 # include <linux/unistd.h>
 # include <sys/syscall.h>
 # define GET_PID() syscall(__NR_gettid)

core/plug-in/g729/g729.c

@@ -36,12 +36,10 @@
 */
 
 #ifndef TEST
-#define _GNU_SOURCE
-#include <unistd.h>
+#include "../../log.h"
 #include <stdio.h>
 #include "amci.h"
 #include "codecs.h"
-#include "../../log.h"
 #else
 #include <stdio.h>
 #define ERROR  printf