Fix compilation problems if dladdr() doesn't exist. Fixes #115005

Original commit message from CVS:
Fix compilation problems if dladdr() doesn't exist.  Fixes #115005

configure.ac

@@ -350,6 +350,14 @@ AC_CHECK_FUNC(posix_memalign,
    AC_DEFINE(HAVE_POSIX_MEMALIGN, 1,
              [Defined if we have posix_memalign ()]))
 
+dnl test if we have dladdr(); we use it for debugging
+save_cflags="$CFLAGS"
+CFLAGS="$CFLAGS -D_GNU_SOURCE"
+AC_CHECK_LIB(dl, dladdr,
+   AC_DEFINE(HAVE_DLADDR, 1,
+             [Defined if we have dladdr ()]))
+CFLAGS="$save_cflags"
+
 if test "x$PLUGINS_USE_BUILDDIR" = xyes; then
   AC_DEFINE(PLUGINS_USE_BUILDDIR, 1, [Define if plugins should be loaded from the build tree - only developers should use this])
 fi

gst/gstinfo.c

@@ -20,12 +20,19 @@
  * Boston, MA 02111-1307, USA.
  */
 
-#include <dlfcn.h>
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include "gst_private.h"
 #include "gstelement.h"
 #include "gstpad.h"
 #include "gstscheduler.h"
+#ifdef HAVE_DLFCN_H
+#include <dlfcn.h>
+#endif
 
+#if 0
 #if defined __sgi__
 #include <rld_interface.h>
 typedef struct DL_INFO {
@@ -47,6 +54,7 @@ int dladdr(void *address, Dl_info *dl)
   return (int)v;
 }
 #endif
+#endif
 
 extern gchar *_gst_progname;
 
@@ -497,12 +505,18 @@ gchar *
 _gst_debug_nameof_funcptr (void *ptr)
 {
   gchar *ptrname;
+#ifdef HAVE_DLADDR
   Dl_info dlinfo;
+#endif
   if (__gst_function_pointers && (ptrname = g_hash_table_lookup(__gst_function_pointers,ptr))) {
     return g_strdup(ptrname);
-  } else if (dladdr(ptr,&dlinfo) && dlinfo.dli_sname) {
+  } else
+#ifdef HAVE_DLADDR
+  if (dladdr(ptr,&dlinfo) && dlinfo.dli_sname) {
     return g_strdup(dlinfo.dli_sname);
-  } else {
+  } else
+#endif
+  {
     return g_strdup_printf("%p",ptr);
   }
   return NULL;