Improved handling missing VDRPluginDestroyer()

CONTRIBUTORS

@@ -2771,6 +2771,7 @@ Winfried K
  for reporting a bug in checking the return value of the Open() call in
  cFileName::SetOffset()
  for adding initialization of cDvbFrontend::frontendInfo
+ for improving handling missing VDRPluginDestroyer()
 
 Hans-Werner Hilse <hilse@web.de>
  for adding the command line option --userdump to enable core dumps in case VDR

HISTORY

@@ -9536,7 +9536,7 @@ Video Disk Recorder Revision History
   cDvbTuner::GetSignalStats() to avoid problems with drivers that don't do this
   (thanks to Helmut Binder).
 
-2020-12-13:
+2020-12-16:
 
 - Fixed multiple recording entries in case a recording is started during the initial
   reading of the video directory (reported by Claus Muus).
@@ -9556,3 +9556,4 @@ Video Disk Recorder Revision History
 - Avoiding a lengthy lock on the Channels list when starting a recording (thanks to
   Helmut Binder).
 - Fixed error handling when loading a plugin (reported by Markus Ehrnsperger).
+- Improved handling missing VDRPluginDestroyer() (thanks to Winfried Köhler).

plugin.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: plugin.c 4.3 2020/12/13 10:56:36 kls Exp $
+ * $Id: plugin.c 4.4 2020/12/16 11:54:06 kls Exp $
  */
 
 #include "plugin.h"
@@ -234,6 +234,10 @@ bool cDll::Load(bool Log)
         plugin = create();
         destroy = (destroy_t *)dlsym(handle, "VDRPluginDestroyer");
         error = dlerror();
+        if (error) {
+           error = NULL;
+           isyslog("plugin %s: missing symbol VDRPluginDestroyer(), please rebuild", fileName);
+           }
         }
      }
   if (!error) {