libvlccore: Also print a backtrace on Mac OS X.

Note: We may want to check that at configure time.

src/misc/objects.c

@@ -1488,7 +1488,7 @@ static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
 }
 
 #ifndef NDEBUG
-# ifdef __GLIBC__
+# if defined(__GLIBC__) || defined(__APPLE__)
 #  include <execinfo.h>
 # endif
 
@@ -1547,7 +1547,7 @@ void vlc_refcheck (vlc_object_t *obj)
              obj->psz_object_type);
     fflush (stderr);
 
-#ifdef __GLIBC__
+#if defined(__GLIBC__) || defined(__APPLE__)
     void *stack[20];
     int stackdepth = backtrace (stack, sizeof (stack) / sizeof (stack[0]));
     backtrace_symbols_fd (stack, stackdepth, 2);

src/misc/threads.c

@@ -83,7 +83,7 @@ static inline unsigned long vlc_threadid (void)
      return v.i;
 }
 
-#ifdef __GLIBC__
+#if defined(__GLIBC__) || defined(__APPLE__)
 # include <execinfo.h>
 #endif
 
@@ -105,10 +105,6 @@ void vlc_pthread_fatal (const char *action, int error,
     /* Avoid the strerror_r() prototype brain damage in glibc */
     errno = error;
     dprintf (2, " Error message: %m at:\n");
-
-    void *stack[20];
-    int len = backtrace (stack, sizeof (stack) / sizeof (stack[0]));
-    backtrace_symbols_fd (stack, len, 2);
 #else
     char buf[1000];
     const char *msg;
@@ -129,6 +125,12 @@ void vlc_pthread_fatal (const char *action, int error,
     fflush (stderr);
 #endif
 
+#if defined(__GLIBC__) || defined(__APPLE__)
+    void *stack[20];
+    int len = backtrace (stack, sizeof (stack) / sizeof (stack[0]));
+    backtrace_symbols_fd (stack, len, 2);
+#endif
+
     abort ();
 }
 #else