Hi all, I'm just running through the plugin writer's guide (<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/index.html">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/index.html</a>), specifically the section about building a plugin from generated boilerplate code, and having trouble compiling it. I have done the following steps: 1. Checked out gst-template from cvs 2. Generated example filter from template: > cd gst-template/gst-plugin/src > ../tools/make_element ExampleFilter This created the .c and .h files as expected. Without making any further changes to the source (since I just want to compile the basic plugin): 3. added the *.c and *.h to src/Makefile.am, so it looks like: # plugindir is set in configure ############################################################################## # change <a href="http://libgstplugin.la">libgstplugin.la</a> to something more suitable, e.g. <a href="http://libmysomething.la">libmysomething.la</a>  # ############################################################################## plugin_LTLIBRARIES = <a href="http://libgstplugin.la">libgstplugin.la</a> ############################################################################## # for the next set of variables, rename the prefix if you renamed the .la,   # #  e.g. libgstplugin_la_SOURCES => libmysomething_la_SOURCES                 # #       libgstplugin_la_CFLAGS  => libmysomething_la_CFLAGS                  # #       libgstplugin_la_LIBADD  => libmysomething_la_LIBADD                  # #       libgstplugin_la_LDFLAGS => libmysomething_la_LDFLAGS                 # ############################################################################## # sources used to compile this plug-in libgstplugin_la_SOURCES = gstplugin.c gstexamplefilter.c # flags used to compile this plugin # add other _CFLAGS and _LIBS as needed libgstplugin_la_CFLAGS = $(GST_CFLAGS) libgstplugin_la_LIBADD = $(GST_LIBS) libgstplugin_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) # headers we need but don't want installed noinst_HEADERS = gstplugin.h gstexamplefilter.h 4. Run autogen.sh, all good still. 5. make - error compiling gstexamplefilter.c: $ make cd . && /bin/bash /space/playpen/gst-template/gst-plugin/missing --run autoheader touch ./<a href="http://config.h.in">config.h.in</a> cd . && /bin/bash ./config.status config.h config.status: creating config.h config.status: config.h is unchanged make  all-recursive make[1]: Entering directory `/space/playpen/gst-template/gst-plugin' Making all in m4 make[2]: Entering directory `/space/playpen/gst-template/gst-plugin/m4' make[2]: Nothing to be done for `all'. make[2]: Leaving directory `/space/playpen/gst-template/gst-plugin/m4' Making all in src make[2]: Entering directory `/space/playpen/gst-template/gst-plugin/src' if /bin/bash ../libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I..    -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2    -Wall -Werror -g -O2 -MT libgstplugin_la-gstplugin.lo -MD -MP -MF ".deps/libgstplugin_la-gstplugin.Tpo" \       -c -o libgstplugin_la-gstplugin.lo `test -f 'gstplugin.c' || echo './'`gstplugin.c; \     then mv -f ".deps/libgstplugin_la-gstplugin.Tpo" ".deps/libgstplugin_la-gstplugin.Plo"; \     else rm -f ".deps/libgstplugin_la-gstplugin.Tpo"; exit 1; \     fi  gcc -DHAVE_CONFIG_H -I. -I. -I.. -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -Wall -Werror -g -O2 -MT libgstplugin_la-gstplugin.lo -MD -MP -MF .deps/libgstplugin_la-gstplugin.Tpo -c gstplugin.c  -fPIC -DPIC -o .libs/libgstplugin_la-gstplugin.o  gcc -DHAVE_CONFIG_H -I. -I. -I.. -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -Wall -Werror -g -O2 -MT libgstplugin_la-gstplugin.lo -MD -MP -MF .deps/libgstplugin_la-gstplugin.Tpo -c gstplugin.c -o libgstplugin_la-gstplugin.o >/dev/null 2>&1 if /bin/bash ../libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I..    -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2    -Wall -Werror -g -O2 -MT libgstplugin_la-gstexamplefilter.lo -MD -MP -MF ".deps/libgstplugin_la-gstexamplefilter.Tpo" \       -c -o libgstplugin_la-gstexamplefilter.lo `test -f 'gstexamplefilter.c' || echo './'`gstexamplefilter.c; \     then mv -f ".deps/libgstplugin_la-gstexamplefilter.Tpo" ".deps/libgstplugin_la-gstexamplefilter.Plo"; \     else rm -f ".deps/libgstplugin_la-gstexamplefilter.Tpo"; exit 1; \     fi  gcc -DHAVE_CONFIG_H -I. -I. -I.. -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -Wall -Werror -g -O2 -MT libgstplugin_la-gstexamplefilter.lo -MD -MP -MF .deps/libgstplugin_la-gstexamplefilter.Tpo -c gstexamplefilter.c  -fPIC -DPIC -o .libs/libgstplugin_la-gstexamplefilter.o cc1: warnings being treated as errors gstexamplefilter.c: In function 'examplefilter_init': gstexamplefilter.c:254: warning: passing argument 1 of 'gst_element_register' from incompatible pointer type gstexamplefilter.c: At top level: gstexamplefilter.c:261: warning: initialization from incompatible pointer type make[2]: *** [libgstplugin_la-gstexamplefilter.lo] Error 1 make[2]: Leaving directory `/space/playpen/gst-template/gst-plugin/src' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/space/playpen/gst-template/gst-plugin' make: *** [all] Error 2 Complete listing of gstexamplefilter.c at end of this post. "gcc -v" gives: Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu Thread model: posix gcc version 4.2.4 (Ubuntu 4.2.4-1ubuntu3) Is it a problem with my gcc being too recent and being stricter on warnings?  Please go easy on me, I haven't any experience with gtk and little with c :-) Thanks in advance, Jono gstexamplefilter.c: /*  * GStreamer  * Copyright (C) 2005 Thomas Vander Stichele <<a href="mailto:thomas@apestaart.org">thomas@apestaart.org</a>>  * Copyright (C) 2005 Ronald S. Bultje <<a href="mailto:rbultje@ronald.bitfreak.net">rbultje@ronald.bitfreak.net</a>>  * Copyright (C) 2008 Jon Burgess <<<a href="mailto:user@hostname.org">user@hostname.org</a>>>  *  * Permission is hereby granted, free of charge, to any person obtaining a  * copy of this software and associated documentation files (the "Software"),  * to deal in the Software without restriction, including without limitation  * the rights to use, copy, modify, merge, publish, distribute, sublicense,  * and/or sell copies of the Software, and to permit persons to whom the  * Software is furnished to do so, subject to the following conditions:  *  * The above copyright notice and this permission notice shall be included in  * all copies or substantial portions of the Software.  *  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER  * DEALINGS IN THE SOFTWARE.  *  * Alternatively, the contents of this file may be used under the  * GNU Lesser General Public License Version 2.1 (the "LGPL"), in  * which case the following provisions apply instead of the ones  * mentioned above:  *  * This library is free software; you can redistribute it and/or  * modify it under the terms of the GNU Library General Public  * License as published by the Free Software Foundation; either  * version 2 of the License, or (at your option) any later version.  *  * This library is distributed in the hope that it will be useful,  * but WITHOUT ANY WARRANTY; without even the implied warranty of  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  * Library General Public License for more details.  *  * You should have received a copy of the GNU Library General Public  * License along with this library; if not, write to the  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,  * Boston, MA 02111-1307, USA.  */ /**  * SECTION:element-examplefilter  *  * FIXME:Describe examplefilter here.  *  * <refsect2>  * <title>Example launch line</title>  * |[  * gst-launch -v -m fakesrc ! examplefilter ! fakesink silent=TRUE  * ]|  * </refsect2>  */ #ifdef HAVE_CONFIG_H #  include <config.h> #endif #include <gst/gst.h> #include "gstexamplefilter.h" GST_DEBUG_CATEGORY_STATIC (gst_example_filter_debug); #define GST_CAT_DEFAULT gst_example_filter_debug /* Filter signals and args */ enum {   /* FILL ME */   LAST_SIGNAL }; enum {   PROP_0,   PROP_SILENT }; /* the capabilities of the inputs and outputs.  *  * describe the real formats here.  */ static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",     GST_PAD_SINK,     GST_PAD_ALWAYS,     GST_STATIC_CAPS ("ANY")     ); static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",     GST_PAD_SRC,     GST_PAD_ALWAYS,     GST_STATIC_CAPS ("ANY")     ); GST_BOILERPLATE (GstExampleFilter, gst_example_filter, GstElement,     GST_TYPE_ELEMENT); static void gst_example_filter_set_property (GObject * object, guint prop_id,     const GValue * value, GParamSpec * pspec); static void gst_example_filter_get_property (GObject * object, guint prop_id,     GValue * value, GParamSpec * pspec); static gboolean gst_example_filter_set_caps (GstPad * pad, GstCaps * caps); static GstFlowReturn gst_example_filter_chain (GstPad * pad, GstBuffer * buf); /* GObject vmethod implementations */ static void gst_example_filter_base_init (gpointer gclass) {   GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);   gst_element_class_set_details_simple(element_class,     "ExampleFilter",     "FIXME:Generic",     "FIXME:Generic Template Element",     "Jon Burgess <<<a href="mailto:user@hostname.org">user@hostname.org</a>>>");   gst_element_class_add_pad_template (element_class,       gst_static_pad_template_get (&src_factory));   gst_element_class_add_pad_template (element_class,       gst_static_pad_template_get (&sink_factory)); } /* initialize the examplefilter's class */ static void gst_example_filter_class_init (GstExampleFilterClass * klass) {   GObjectClass *gobject_class;   GstElementClass *gstelement_class;   gobject_class = (GObjectClass *) klass;   gstelement_class = (GstElementClass *) klass;   gobject_class->set_property = gst_example_filter_set_property;   gobject_class->get_property = gst_example_filter_get_property;   g_object_class_install_property (gobject_class, PROP_SILENT,       g_param_spec_boolean ("silent", "Silent", "Produce verbose output ?",           FALSE, G_PARAM_READWRITE)); } /* initialize the new element  * instantiate pads and add them to element  * set pad calback functions  * initialize instance structure  */ static void gst_example_filter_init (GstExampleFilter * filter,     GstExampleFilterClass * gclass) {   filter->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");   gst_pad_set_setcaps_function (filter->sinkpad,                                 GST_DEBUG_FUNCPTR(gst_example_filter_set_caps));   gst_pad_set_getcaps_function (filter->sinkpad,                                 GST_DEBUG_FUNCPTR(gst_pad_proxy_getcaps));   gst_pad_set_chain_function (filter->sinkpad,                               GST_DEBUG_FUNCPTR(gst_example_filter_chain));   filter->srcpad = gst_pad_new_from_static_template (&src_factory, "src");   gst_pad_set_getcaps_function (filter->srcpad,                                 GST_DEBUG_FUNCPTR(gst_pad_proxy_getcaps));   gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);   gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);   filter->silent = FALSE; } static void gst_example_filter_set_property (GObject * object, guint prop_id,     const GValue * value, GParamSpec * pspec) {   GstExampleFilter *filter = GST_EXAMPLEFILTER (object);   switch (prop_id) {     case PROP_SILENT:       filter->silent = g_value_get_boolean (value);       break;     default:       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);       break;   } } static void gst_example_filter_get_property (GObject * object, guint prop_id,     GValue * value, GParamSpec * pspec) {   GstExampleFilter *filter = GST_EXAMPLEFILTER (object);   switch (prop_id) {     case PROP_SILENT:       g_value_set_boolean (value, filter->silent);       break;     default:       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);       break;   } } /* GstElement vmethod implementations */ /* this function handles the link with other elements */ static gboolean gst_example_filter_set_caps (GstPad * pad, GstCaps * caps) {   GstExampleFilter *filter;   GstPad *otherpad;   filter = GST_EXAMPLEFILTER (gst_pad_get_parent (pad));   otherpad = (pad == filter->srcpad) ? filter->sinkpad : filter->srcpad;   gst_object_unref (filter);   return gst_pad_set_caps (otherpad, caps); } /* chain function  * this function does the actual processing  */ static GstFlowReturn gst_example_filter_chain (GstPad * pad, GstBuffer * buf) {   GstExampleFilter *filter;   filter = GST_EXAMPLEFILTER (GST_OBJECT_PARENT (pad));   if (filter->silent == FALSE)     g_print ("I'm plugged, therefore I'm in.\n");   /* just push out the incoming buffer without touching it */   return gst_pad_push (filter->srcpad, buf); } /* entry point to initialize the plug-in  * initialize the plug-in itself  * register the element factories and other features  */ static gboolean examplefilter_init (GstExampleFilter * examplefilter) {   /* debug category for fltering log messages    *    * exchange the string 'Template examplefilter' with your description    */   GST_DEBUG_CATEGORY_INIT (gst_example_filter_debug, "examplefilter",       0, "Template examplefilter");   return gst_element_register (examplefilter, "examplefilter", GST_RANK_NONE,       GST_TYPE_EXAMPLEFILTER); } /* gstreamer looks for this structure to register examplefilters  *  * exchange the string 'Template examplefilter' with your examplefilter description  */ GST_PLUGIN_DEFINE (     GST_VERSION_MAJOR,     GST_VERSION_MINOR,     "examplefilter",     "Template examplefilter",     examplefilter_init,     VERSION,     "LGPL",     "GStreamer",     "<a href="http://gstreamer.net/">http://gstreamer.net/</a>" ) gstexamplefilter.h: /*  * GStreamer  * Copyright (C) 2005 Thomas Vander Stichele <<a href="mailto:thomas@apestaart.org">thomas@apestaart.org</a>>  * Copyright (C) 2005 Ronald S. Bultje <<a href="mailto:rbultje@ronald.bitfreak.net">rbultje@ronald.bitfreak.net</a>>  * Copyright (C) 2008 Jon Burgess <<<a href="mailto:user@hostname.org">user@hostname.org</a>>>  *  * Permission is hereby granted, free of charge, to any person obtaining a  * copy of this software and associated documentation files (the "Software"),  * to deal in the Software without restriction, including without limitation  * the rights to use, copy, modify, merge, publish, distribute, sublicense,  * and/or sell copies of the Software, and to permit persons to whom the  * Software is furnished to do so, subject to the following conditions:  *  * The above copyright notice and this permission notice shall be included in  * all copies or substantial portions of the Software.  *  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER  * DEALINGS IN THE SOFTWARE.  *  * Alternatively, the contents of this file may be used under the  * GNU Lesser General Public License Version 2.1 (the "LGPL"), in  * which case the following provisions apply instead of the ones  * mentioned above:  *  * This library is free software; you can redistribute it and/or  * modify it under the terms of the GNU Library General Public  * License as published by the Free Software Foundation; either  * version 2 of the License, or (at your option) any later version.  *  * This library is distributed in the hope that it will be useful,  * but WITHOUT ANY WARRANTY; without even the implied warranty of  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  * Library General Public License for more details.  *  * You should have received a copy of the GNU Library General Public  * License along with this library; if not, write to the  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,  * Boston, MA 02111-1307, USA.  */ #ifndef __GST_EXAMPLEFILTER_H__ #define __GST_EXAMPLEFILTER_H__ #include <gst/gst.h> G_BEGIN_DECLS /* #defines don't like whitespacey bits */ #define GST_TYPE_EXAMPLEFILTER \   (gst_example_filter_get_type()) #define GST_EXAMPLEFILTER(obj) \   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_EXAMPLEFILTER,GstExampleFilter)) #define GST_EXAMPLEFILTER_CLASS(klass) \   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_EXAMPLEFILTER,GstExampleFilterClass)) #define GST_IS_EXAMPLEFILTER(obj) \   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_EXAMPLEFILTER)) #define GST_IS_EXAMPLEFILTER_CLASS(klass) \   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_EXAMPLEFILTER)) typedef struct _GstExampleFilter      GstExampleFilter; typedef struct _GstExampleFilterClass GstExampleFilterClass; struct _GstExampleFilter {   GstElement element;   GstPad *sinkpad, *srcpad;   gboolean silent; }; struct _GstExampleFilterClass {   GstElementClass parent_class; }; GType gst_example_filter_get_type (void); G_END_DECLS #endif /* __GST_EXAMPLEFILTER_H__ */