Gtk and gstreamer linker error

Question

I m trying to compile the simple gst player from google code. I have fixed and installed missing libraries now i m getting a linker error

vickey@tb:~/work/gst-player-0.0.0$ make
gcc -ggdb -Wall -W -Wformat-nonliteral -Wcast-align -Wpointer-arith -Wbad-function-cast -Wmissing-prototypes -Wstrict-prototypes -Wmissing-declarations -Winline -Wundef -Wnested-externs -Wcast-qual -Wshadow -Wwrite-strings -Wno-unused-parameter -Wfloat-equal -pedantic -ansi -std=c99 `pkg-config --cflags gtk+-2.0` `pkg-config --libs gtk+-2.0` `pkg-config --cflags gstreamer-0.10` `pkg-config --libs gstreamer-0.10` -lgstinterfaces-0.10 ui.c gst-backend.c -o gst-player
In file included from /usr/include/gtk-2.0/gtk/gtk.h:236:0,
                 from ui.c:19:
/usr/include/gtk-2.0/gtk/gtkitemfactory.h:47:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
ui.c: In function ‘toggle_fullscreen’:
ui.c:60:9: warning: passing argument 1 of ‘gtk_window_unfullscreen’ from incompatible pointer type [enabled by default]
/usr/include/gtk-2.0/gtk/gtkwindow.h:340:10: note: expected ‘struct GtkWindow *’ but argument is of type ‘struct GtkWidget *’
ui.c:65:9: warning: passing argument 1 of ‘gtk_window_fullscreen’ from incompatible pointer type [enabled by default]
/usr/include/gtk-2.0/gtk/gtkwindow.h:339:10: note: expected ‘struct GtkWindow *’ but argument is of type ‘struct GtkWidget *’
gst-backend.c: In function ‘backend_query_position’:
gst-backend.c:164:5: warning: pointer targets in passing argument 3 of ‘gst_element_query_position’ differ in signedness [-Wpointer-sign]
/usr/include/gstreamer-0.10/gst/gstutils.h:1047:25: note: expected ‘gint64 *’ but argument is of type ‘guint64 *’
gst-backend.c: In function ‘backend_query_duration’:
gst-backend.c:177:5: warning: pointer targets in passing argument 3 of ‘gst_element_query_duration’ differ in signedness [-Wpointer-sign]
/usr/include/gstreamer-0.10/gst/gstutils.h:1049:25: note: expected ‘gint64 *’ but argument is of type ‘guint64 *’
/tmp/cckH1GSv.o: In function `toggle_paused':
/home/vickey/work/gst-player-0.0.0/ui.c:43: undefined reference to `gtk_button_get_type'
/home/vickey/work/gst-player-0.0.0/ui.c:43: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:43: undefined reference to `gtk_button_set_label'
/home/vickey/work/gst-player-0.0.0/ui.c:49: undefined reference to `gtk_button_get_type'
/home/vickey/work/gst-player-0.0.0/ui.c:49: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:49: undefined reference to `gtk_button_set_label'
/tmp/cckH1GSv.o: In function `toggle_fullscreen':
/home/vickey/work/gst-player-0.0.0/ui.c:60: undefined reference to `gtk_window_unfullscreen'
/home/vickey/work/gst-player-0.0.0/ui.c:65: undefined reference to `gtk_window_fullscreen'
/tmp/cckH1GSv.o: In function `destroy':
/home/vickey/work/gst-player-0.0.0/ui.c:96: undefined reference to `gtk_main_quit'
/    tmp/cckH1GSv.o: In function `key_press':
/home/vickey/work/gst-player-0.0.0/ui.c:127: undefined reference to `gtk_main_quit'
/tmp/cckH1GSv.o: In function `start':
/home/vickey/work/gst-player-0.0.0/ui.c:167: undefined reference to `gtk_window_new'
/home/vickey/work/gst-player-0.0.0/ui.c:169: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:169: undefined reference to `g_signal_connect_data'
/home/vickey/work/gst-player-0.0.0/ui.c:172: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:172: undefined reference to `g_signal_connect_data'
/home/vickey/work/gst-player-0.0.0/ui.c:175: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:175: undefined reference to `g_signal_connect_data'
/home/vickey/work/gst-player-0.0.0/ui.c:178: undefined reference to `gtk_container_get_type'
/home/vickey/work/gst-player-0.0.0/ui.c:178: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:178: undefined reference to `gtk_container_set_border_width'
/home/vickey/work/gst-player-0.0.0/ui.c:180: undefined reference to `gtk_vbox_new'
/home/vickey/work/gst-player-0.0.0/ui.c:182: undefined reference to `gtk_container_get_type'
/home/vickey/work/gst-player-0.0.0/ui.c:182: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:182: undefined reference to `gtk_container_add'
/home/vickey/work/gst-player-0.0.0/ui.c:184: undefined reference to `gtk_widget_show'
/home/vickey/work/gst-player-0.0.0/ui.c:186: undefined reference to `gtk_hbox_new'
/home/vickey/work/gst-player-0.0.0/ui.c:188: undefined reference to `gtk_box_get_type'
/home/vickey/work/gst-player-0.0.0/ui.c:188: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:188: undefined reference to `gtk_box_pack_end'
/home/vickey/work/gst-player-0.0.0/ui.c:190: undefined reference to `gtk_widget_show'
/home/vickey/work/gst-player-0.0.0/ui.c:193: undefined reference to `gtk_drawing_area_new'
/home/vickey/work/gst-player-0.0.0/ui.c:195: undefined reference to `gtk_box_get_type'
/home/vickey/work/gst-player-0.0.0/ui.c:195: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:195: undefined reference to `gtk_box_pack_start'
/home/vickey/work/gst-player-0.0.0/ui.c:197: undefined reference to `gtk_widget_set_size_request'
/home/vickey/work/gst-player-0.0.0/ui.c:199: undefined reference to `gtk_widget_show'
/home/vickey/work/gst-player-0.0.0/ui.c:203: undefined reference to `gtk_button_new_with_label'
/home/vickey/work/gst-player-0.0.0/ui.c:205: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:205: undefined reference to `g_signal_connect_data'
/home/vickey/work/gst-player-0.0.0/ui.c:208: undefined reference to `gtk_box_get_type'
/home/vickey/work/gst-player-0.0.0/ui.c:208: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:208: undefined reference to `gtk_box_pack_start'
/home/vickey/work/gst-player-0.0.0/ui.c:210: undefined reference to `gtk_widget_show'
/home/vickey/work/gst-player-0.0.0/ui.c:216: undefined reference to `gtk_button_new_with_label'
/home/vickey/work/gst-player-0.0.0/ui.c:218: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:218: undefined reference to `g_signal_connect_data'
/home/vickey/work/gst-player-0.0.0/ui.c:221: undefined reference to `gtk_box_get_type'
/home/vickey/work/gst-player-0.0.0/ui.c:221: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:221: undefined reference to `gtk_box_pack_start'
/home/vickey/work/gst-player-0.0.0/ui.c:223: undefined reference to `gtk_widget_show'
/home/vickey/work/gst-player-0.0.0/ui.c:228: undefined reference to `gtk_adjustment_new'
/home/vickey/work/gst-player-0.0.0/ui.c:229: undefined reference to `gtk_adjustment_get_type'
/home/vickey/work/gst-player-0.0.0/ui.c:229: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:229: undefined reference to `gtk_hscale_new'
/home/vickey/work/gst-player-0.0.0/ui.c:231: undefined reference to `gtk_box_get_type'
/home/vickey/work/gst-player-0.0.0/ui.c:231: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:231: undefined reference to `gtk_box_pack_end'
/home/vickey/work/gst-player-0.0.0/ui.c:233: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:233: undefined reference to `g_signal_connect_data'
/home/vickey/work/gst-player-0.0.0/ui.c:236: undefined reference to `gtk_widget_show'
/home/vickey/work/gst-player-0.0.0/ui.c:239: undefined reference to `gtk_widget_show'
/tmp/cckH1GSv.o: In function `init':
/    home/vickey/work/gst-player-0.0.0/ui.c:245: undefined reference to `gdk_x11_drawable_get_xid'
/tmp/cckH1GSv.o: In function `timeout':
/home/vickey/work/gst-player-0.0.0/ui.c:275: undefined reference to `gtk_range_get_type'
/home/vickey/work/gst-player-0.0.0/ui.c:275: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/ui.c:275: undefined reference to `gtk_range_set_value'
/tmp/cckH1GSv.o: In function `main':
/home/vickey/work/gst-player-0.0.0/ui.c:285: undefined reference to `gtk_init'
/home/vickey/work/gst-player-0.0.0/ui.c:293: undefined reference to `g_strdup'
/home/vickey/work/gst-player-0.0.0/ui.c:295: undefined reference to `g_strdup_printf'
/home/vickey/work/gst-player-0.0.0/ui.c:299: undefined reference to `g_idle_add'
/home/vickey/work/gst-player-0.0.0/ui.c:300: undefined reference to `g_timeout_add'
/home/vickey/work/gst-player-0.0.0/ui.c:302: undefined reference to `gtk_main'
/home/vickey/work/gst-player-0.0.0/ui.c:304: undefined reference to `g_free'
/tmp/cc9cDvJS.o: In function `bus_cb':
/home/vickey/work/gst-player-0.0.0/gst-backend.c:39: undefined reference to `g_log'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:47: undefined reference to `gst_message_parse_error'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:48: undefined reference to `g_free'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:50: undefined reference to `g_log'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:51: undefined reference to `g_error_free'
/tmp/cc9cDvJS.o: In function `backend_init':
/home/vickey/work/gst-player-0.0.0/gst-backend.c:65: undefined reference to `gst_init'
/tmp/cc9cDvJS.o: In function `backend_play':
/home/vickey/work/gst-player-0.0.0/gst-backend.c:79: undefined reference to `gst_pipeline_new'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:81: undefined reference to `gst_element_factory_make'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:82: undefined reference to `gst_element_factory_make'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:84: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:84: undefined reference to `g_object_set'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:86: undefined reference to `gst_bin_get_type'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:86: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:86: undefined reference to `gst_bin_add'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:90: undefined reference to `gst_pipeline_get_type'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:90: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:90: undefined reference to `gst_pipeline_get_bus'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:91: undefined reference to `gst_bus_add_watch'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:92: undefined reference to `gst_object_unref'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:95: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:95: undefined reference to `g_object_set'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:97: undefined reference to `gst_x_overlay_get_type'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:97: undefined reference to `gst_implements_interface_check'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:99: undefined reference to `gst_x_overlay_get_type'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:99: undefined reference to `gst_implements_interface_cast'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:99: undefined reference to `gst_x_overlay_set_xwindow_id'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:102: undefined reference to `gst_element_set_state'
/tmp/cc9cDvJS.o: In function `backend_stop':
/home/vickey/work/gst-player-0.0.0/gst-backend.c:110: undefined reference to `gst_element_set_state'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:111: undefined reference to `gst_object_get_type'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:111: undefined reference to `g_type_check_instance_cast'
/home/vickey/work/gst-player-0.0.0/gst-backend.c:111: undefined reference to `gst_object_unref'
/tmp/cc9cDvJS.o: In function `backend_pause':
/home/vickey/work/gst-player-0.0.0/gst-backend.c:119: undefined reference to `gst_element_set_state'
/tmp/cc9cDvJS.o: In function `backend_resume':
/home/vickey/work/gst-player-0.0.0/gst-backend.c:125: undefined reference to `gst_element_set_state'
/tmp/cc9cDvJS.o: In function `backend_reset':
/home/vickey/work/gst-player-0.0.0/gst-backend.c:131: undefined reference to `gst_element_seek'
/tmp/cc9cDvJS.o: In function `backend_seek':
/home/vickey/work/gst-player-0.0.0/gst-backend.c:141: undefined reference to `gst_element_seek'
/tmp/cc9cDvJS.o: In function `backend_seek_absolute':
/home/vickey/work/gst-player-0.0.0/gst-backend.c:151: undefined reference to `gst_element_seek'
/tmp/cc9cDvJS.o: In function `backend_query_position':
/home/vickey/work/gst-player-0.0.0/gst-backend.c:164: undefined reference to `gst_element_query_position'
/tmp/cc9cDvJS.o: In function `backend_query_duration':
/home/vickey/work/gst-player-0.0.0/gst-backend.c:177: undefined reference to `gst_element_query_duration'
collect2: ld returned 1 exit status
make: *** [gst-player] Error 1

I think I might be missing some library imports but I am not able to figure out . Thanks

Answer 1

The problem most likely because the linker is not linking against the library until it see any symbol from the library in the compilation, as the source appears after the linking to libraries while compiling. As the linker will not link against a library until it encounters a symbol in the library from the source, you will need to move the source at the beginning of compilation command. Currently the Makefile provide in the source link builds as follows:

 19 gst-player: ui.c gst-backend.c
 20     $(CC) $(CFLAGS) $(GTK_CFLAGS) $(GTK_LIBS) $(GST_CFLAGS) $(GST_LIBS) $+ -o $@

Change that to :

 19 gst-player: ui.c gst-backend.c
 20     $(CC) $+ $(CFLAGS) $(GTK_CFLAGS) $(GTK_LIBS) $(GST_CFLAGS) $(GST_LIBS) -o $@

(Note that now the sources are right after $(CC)). Alternatively, you can ask the linker to link the libraries irrespectively of encountering the symbols from the library using -Wl, --no-as-needed option. In that case, Makefile changes might look like this:

 19 gst-player: ui.c gst-backend.c
 20     $(CC) -Wl,--no-as-needed $(CFLAGS) $(GTK_CFLAGS) $(GTK_LIBS) $(GST_CFLAGS) $(GST_LIBS) $+ -o $@  

Hope this helps!