build: fix debug output werror build with newer gcc

In file included from ../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gst.h:55,
                 from ../gst-libs/gst/tag/tag.h:25,
                 from ../gst-libs/gst/tag/gsttageditingprivate.h:24,
                 from ../gst-libs/gst/tag/gsttageditingprivate.c:23:
../gst-libs/gst/tag/gsttageditingprivate.c: In function ‘__exif_tag_capturing_white_balance_to_exif_value’:
../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gstinfo.h:645:5: error: ‘%s’ directive argument is null [-Werror=format-overflow=]
  645 |     gst_debug_log ((cat), (level), __FILE__, GST_FUNCTION, __LINE__, \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  646 |         (GObject *) (object), __VA_ARGS__);    \
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gstinfo.h:1068:27: note: in expansion of macro ‘GST_CAT_LEVEL_LOG’
 1068 | #define GST_WARNING(...)  GST_CAT_LEVEL_LOG (GST_CAT_DEFAULT, GST_LEVEL_WARNING, NULL, __VA_ARGS__)
      |                           ^~~~~~~~~~~~~~~~~
../gst-libs/gst/tag/gsttageditingprivate.c:265:3: note: in expansion of macro ‘GST_WARNING’
  265 |   GST_WARNING ("Invalid white balance: %s", str);
      |   ^~~~~~~~~~~
../gst-libs/gst/tag/gsttageditingprivate.c:265:40: note: format string is defined here
  265 |   GST_WARNING ("Invalid white balance: %s", str);
      |                                        ^~

In file included from ../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gst.h:55,
                 from ../gst-libs/gst/tag/tag.h:25,
                 from ../gst-libs/gst/tag/gstxmptag.c:39:
../gst-libs/gst/tag/gstxmptag.c: In function ‘deserialize_exif_gps_direction’:
../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gstinfo.h:645:5: error: ‘%s’ directive argument is null [-Werror=format-overflow=]
  645 |     gst_debug_log ((cat), (level), __FILE__, GST_FUNCTION, __LINE__, \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  646 |         (GObject *) (object), __VA_ARGS__);    \
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gstinfo.h:1068:27: note: in expansion of macro ‘GST_CAT_LEVEL_LOG’
 1068 | #define GST_WARNING(...)  GST_CAT_LEVEL_LOG (GST_CAT_DEFAULT, GST_LEVEL_WARNING, NULL, __VA_ARGS__)
      |                           ^~~~~~~~~~~~~~~~~
../gst-libs/gst/tag/gstxmptag.c:818:5: note: in expansion of macro ‘GST_WARNING’
  818 |     GST_WARNING ("Missing %s tag", dirref_str);
      |     ^~~~~~~~~~~
../gst-libs/gst/tag/gstxmptag.c:818:27: note: format string is defined here
  818 |     GST_WARNING ("Missing %s tag", dirref_str);
      |                           ^~
In file included from ../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gst.h:55,
                 from ../gst-libs/gst/tag/tag.h:25,
                 from ../gst-libs/gst/tag/gstxmptag.c:39:
../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gstinfo.h:645:5: error: ‘%s’ directive argument is null [-Werror=format-overflow=]
  645 |     gst_debug_log ((cat), (level), __FILE__, GST_FUNCTION, __LINE__, \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  646 |         (GObject *) (object), __VA_ARGS__);    \
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gstinfo.h:1068:27: note: in expansion of macro ‘GST_CAT_LEVEL_LOG’
 1068 | #define GST_WARNING(...)  GST_CAT_LEVEL_LOG (GST_CAT_DEFAULT, GST_LEVEL_WARNING, NULL, __VA_ARGS__)
      |                           ^~~~~~~~~~~~~~~~~
../gst-libs/gst/tag/gstxmptag.c:814:5: note: in expansion of macro ‘GST_WARNING’
  814 |     GST_WARNING ("Missing %s tag", dir_str);
      |     ^~~~~~~~~~~
../gst-libs/gst/tag/gstxmptag.c:814:27: note: format string is defined here
  814 |     GST_WARNING ("Missing %s tag", dir_str);
      |                           ^~

In file included from ../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gst.h:55,
                 from ../gst-libs/gst/gl/gstgl_fwd.h:24,
                 from ../gst-libs/gst/gl/gl.h:24,
                 from ../gst-libs/gst/gl/gstglsl.c:25:
../gst-libs/gst/gl/gstglsl.c: In function ‘gst_glsl_version_profile_from_string’:
../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gstinfo.h:645:5: error: ‘%s’ directive argument is null [-Werror=format-overflow=]
  645 |     gst_debug_log ((cat), (level), __FILE__, GST_FUNCTION, __LINE__, \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  646 |         (GObject *) (object), __VA_ARGS__);    \
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../../dist/linux_x86_64/include/gstreamer-1.0/gst/gstinfo.h:1068:27: note: in expansion of macro ‘GST_CAT_LEVEL_LOG’
 1068 | #define GST_WARNING(...)  GST_CAT_LEVEL_LOG (GST_CAT_DEFAULT, GST_LEVEL_WARNING, NULL, __VA_ARGS__)
      |                           ^~~~~~~~~~~~~~~~~
../gst-libs/gst/gl/gstglsl.c:333:7: note: in expansion of macro ‘GST_WARNING’
  333 |       GST_WARNING ("Invalid preprocesser directive detected: %s", version_s);
      |       ^~~~~~~~~~~
../gst-libs/gst/gl/gstglsl.c:333:62: note: format string is defined here
  333 |       GST_WARNING ("Invalid preprocesser directive detected: %s", version_s);
      |                                                              ^~

In function ‘print_stream_info’,
    inlined from ‘print_topology’ at ../tools/gst-discoverer.c:352:3:
../tools/gst-discoverer.c:316:3: error: ‘%s’ directive argument is null [-Werror=format-overflow=]
  316 |   g_print ("%*s%s: %s\n", 2 * GPOINTER_TO_INT (depth), " ",
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  317 |       gst_discoverer_stream_info_get_stream_type_nick (info), desc);
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1 files changed, 2 insertions, 1 deletions

diff --git a/tools/gst-discoverer.c b/tools/gst-discoverer.c
index 21ff363f4..c063c49e5 100644
--- a/tools/gst-discoverer.c
+++ b/tools/gst-discoverer.c
@@ -314,7 +314,8 @@ print_stream_info (GstDiscovererStreamInfo * info, void *depth)
   }
 
   g_print ("%*s%s: %s\n", 2 * GPOINTER_TO_INT (depth), " ",
-      gst_discoverer_stream_info_get_stream_type_nick (info), desc);
+      gst_discoverer_stream_info_get_stream_type_nick (info),
+      GST_STR_NULL (desc));
 
   if (desc) {
     g_free (desc);