gtk2/docs/reference/gtk/running.sgml
Matthias Clasen 2f965d22f7 Mention that modules can also be specified in a setting.
2004-09-01  Matthias Clasen  <mclasen@redhat.com>

	* gtk/running.sgml: Mention that modules can also
	be specified in a setting.
2004-09-01 20:41:46 +00:00

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<refentry id="gtk-running" revision="10 Jan 2002">
<refmeta>
<refentrytitle>Running GTK+ Applications</refentrytitle>
<manvolnum>3</manvolnum>
<refmiscinfo>GTK Library</refmiscinfo>
</refmeta>
<refnamediv>
<refname>Running GTK+ Applications</refname>
<refpurpose>
How to run and debug your GTK+ application
</refpurpose>
</refnamediv>
<refsect1>
<title>Running and debugging GTK+ Applications</title>
<refsect2>
<title>Common commandline options</title>
<para>
All GTK+ applications support a number of standard commandline
options. These are removed from <literal>argv</literal> by <link
linkend="gtk-init">gtk_init()</link>. Modules may parse and remove
further options. The <link linkend="x11-cmdline">X11</link> and
<link linkend="win32-cmdline">Windows</link> GDK backends parse
some additional commandline options.
</para>
<formalpara>
<title><systemitem>--gtk-module <replaceable>module</replaceable></systemitem></title>
<para>
A list of modules to load in addition to those specified in the
<envar>GTK_MODULES</envar> environment variable and the
<literal>gtk-modules</literal> setting.
</para>
</formalpara>
<formalpara>
<title><systemitem>--g-fatal-warnings</systemitem></title>
<para>
Make GTK+ abort on all warnings. This is useful to stop on the first
warning in a debugger, if your application is printing multiple
warnings. It's almost always best to start debugging with the first
warning that occurs.
</para>
</formalpara>
<formalpara>
<title><systemitem>--gtk-debug <replaceable>options</replaceable></systemitem></title>
<para>
A list of <link linkend="GTK-Debug-Options">debug options</link>
to turn on in addition to those specified in the <envar>GTK_DEBUG</envar>
environment variable.
This option is only available if GTK+ has been configured with
<option>--enable-debug=yes</option>.
</para>
</formalpara>
<formalpara>
<title><systemitem>--gtk-no-debug <replaceable>options</replaceable></systemitem></title>
<para>
A list of <link linkend="GTK-Debug-Options">debug options</link>
to turn off.
This option is only available if GTK+ has been configured with
<option>--enable-debug=yes</option>.
</para>
</formalpara>
<para>
The following options are really used by GDK, not by GTK+, but we
list them here for completeness nevertheless.
</para>
<formalpara>
<title><systemitem>--class <replaceable>class</replaceable></systemitem></title>
<para>
Sets the program class; see <link linkend="gdk-set-program-class"><function>gdk_set_program_class</function>()</link>.
</para>
</formalpara>
<formalpara>
<title><systemitem>--name <replaceable>name</replaceable></systemitem></title>
<para>
Sets the program name.
</para>
</formalpara>
<formalpara>
<title><systemitem>--gdk-debug <replaceable>options</replaceable></systemitem></title>
<para>
A list of <link linkend="GDK-Debug-Options">debug options</link>
to turn on in addition to those
specified in the <envar>GDK_DEBUG</envar> environment variable.
This option is only available if GTK+ has been configured with
<option>--enable-debug=yes</option>.
</para>
</formalpara>
<formalpara>
<title><systemitem>--gdk-no-debug <replaceable>options</replaceable></systemitem></title>
<para>
A list of <link linkend="GDK-Debug-Options">debug options</link>
to turn off.
This option is only available if GTK+ has been configured with
<option>--enable-debug=yes</option>.
</para>
</formalpara>
</refsect2>
<refsect2>
<title>Environment variables</title>
<para>
GTK+ inspects a number of environment variables in addition to standard
variables like <envar>LANG</envar>, <envar>PATH</envar>, <envar>HOME</envar>
or <envar>DISPLAY</envar>; mostly to determine paths to look for certain
files. The <link linkend="x11-envar">X11</link>,
<link linkend="win32-envar">Windows</link> and
<link linkend="fb-envar">Framebuffer</link> GDK backends use some
additional environment variables.
</para>
<formalpara id="GTK-Debug-Options">
<title><envar>GTK_DEBUG</envar></title>
<para>
If GTK+ has been configured with <option>--enable-debug=yes</option>,
this variable can be set to a list of debug options, which cause GTK+
to print out different types of debugging information.
<variablelist>
<varlistentry>
<term>misc</term>
<listitem><para>Miscellaneous information</para></listitem>
</varlistentry>
<varlistentry>
<term>text</term>
<listitem><para>Information about text widget internals</para></listitem>
</varlistentry>
<varlistentry>
<term>tree</term>
<listitem><para>Information about tree widget internals</para></listitem>
</varlistentry>
<varlistentry>
<term>updates</term>
<listitem><para>Visual feedback about window updates</para></listitem>
</varlistentry>
</variablelist>
The special value <literal>all</literal> can be used to turn on all debug options.
</para>
</formalpara>
<formalpara>
<title><envar>GTK_MODULES</envar></title>
<para>
A list of modules to load.
</para>
</formalpara>
<formalpara>
<title><envar>GTK_PATH</envar></title>
<para>
Specifies a list of directories to search when GTK+ is looking for
dynamically loaded objects such as the modules specified by
<envar>GTK_MODULES</envar>, theme engines, and input method
modules. If the path to the dynamically loaded object is given
as an absolute path name, then GTK+ loads it directly. Otherwise,
GTK+ goes in turn through the directories in GTK_PATH, followed
by the directory <filename>.gtk-2.0</filename> in the user's home
directory, followed by the system default directory,
which is <filename><replaceable>libdir</replaceable>/gtk-2.0/modules</filename>.
(If <envar>GTK_EXE_PREFIX</envar> is defined, <replaceable>libdir</replaceable> is
<filename>$GTK_EXE_PREFIX/lib</filename>. Otherwise it is the libdir
specified when GTK+ was configured, usually
<filename>/usr/lib</filename>, or
<filename>/usr/local/lib</filename>.)
For each directory in this list, GTK+ actually looks in a
subdirectory
<filename><replaceable>directory</replaceable>/<replaceable>version</replaceable>/<replaceable>host</replaceable>/<replaceable>type</replaceable></filename>
Where <replaceable>version</replaceable> is derived from the
version of GTK+ (use <literal>pkg-config
--variable=gtk_binary_version gtk+-2.0</literal> to determine this from a
script), <replaceable>host</replaceable> is the architecture on
which GTK+ was built. (use <literal>pkg-config
--variable=gtk_host gtk+-2.0</literal> to determine this from a
script), and <replaceable>type</replaceable> is a directory
specific to the type of modules; currently it can be
<literal>modules</literal>, <literal>engines</literal> or
<literal>immodules</literal> corresponding to the three types of
modules above. Either <replaceable>version</replaceable>,
<replaceable>host</replaceable>, or both may be omitted. GTK+ looks
first in the most specific directory, then in directories with
fewer components.
The components of GTK_PATH are separated by the ':' character on
Linux and Unix, and the ';' character on Windows.
</para>
</formalpara>
<formalpara>
<title><envar>GTK_IM_MODULE</envar></title>
<para>
Specifies an IM module to use in preference to the one determined
from the locale.
</para>
</formalpara>
<formalpara id="im-module-file">
<title><envar>GTK_IM_MODULE_FILE</envar></title>
<para>
Specifies the file listing the IM modules to load. This environment
variable overrides the <literal>im_module_file</literal> specified in
the RC files, which in turn overrides the default value
<filename><replaceable>sysconfdir</replaceable>/gtk-2.0/gtk.immodules</filename>
(<replaceable>sysconfdir</replaceable> is the sysconfdir specified when GTK+ was configured,
usually <filename>/usr/local/etc</filename>.)
</para>
</formalpara>
<formalpara>
<title><envar>GTK2_RC_FILES</envar></title>
<para>
Specifies a list of RC files to parse instead of the default ones;
see <link linkend="gtk-Resource-Files">Resource Files</link>.
</para>
</formalpara>
<formalpara>
<title><envar>GTK_EXE_PREFIX</envar></title>
<para>
If set, GTK+ uses <filename>$GTK_EXE_PREFIX/lib</filename> instead of
the libdir configured when GTK+ was compiled.
</para>
</formalpara>
<formalpara>
<title><envar>GTK_DATA_PREFIX</envar></title>
<para>
If set, makes GTK+ use <filename>$GTK_DATA_PREFIX</filename>
instead of the prefix configured when GTK+ was compiled.
</para>
</formalpara>
<para>
The following environment variables are used by GdkPixbuf, GDK or
Pango, not by GTK+ itself, but we list them here for completeness
nevertheless.
</para>
<formalpara>
<title><envar>GDK_PIXBUF_MODULE_FILE</envar></title>
<para>
Specifies the file listing the GdkPixbuf loader modules to load.
This environment variable overrides the default value
<filename><replaceable>sysconfdir</replaceable>/gtk-2.0/gdk-pixbuf.loaders</filename>
(<replaceable>sysconfdir</replaceable> is the sysconfdir specified when
GTK+ was configured, usually <filename>/usr/local/etc</filename>.)
</para>
</formalpara>
<formalpara id="GDK-Debug-Options">
<title><envar>GDK_DEBUG</envar></title>
<para>
If GTK+ has been configured with <option>--enable-debug=yes</option>,
this variable can be set to a list of debug options, which cause GDK
to print out different types of debugging information.
<variablelist>
<varlistentry>
<term>misc</term>
<listitem><para>Miscellaneous information</para></listitem>
</varlistentry>
<varlistentry>
<term>events</term>
<listitem><para>Show all events received by GDK</para></listitem>
</varlistentry>
<varlistentry>
<term>dnd</term>
<listitem><para>Information about drag-and-drop</para></listitem>
</varlistentry>
<varlistentry>
<term>xim</term>
<listitem><para>Information about XIM support</para></listitem>
</varlistentry>
</variablelist>
The special value <literal>all</literal> can be used to turn on all debug options.
</para>
</formalpara>
<formalpara>
<title><envar>XDG_DATA_HOME</envar>, <envar>XDG_DATA_DIRS</envar></title>
<para>
GTK+ uses these environment variables to locate icon themes
and MIME information. For more information, see
<ulink url="http://freedesktop.org/Standards/icon-theme-spec">Icon Theme Specification</ulink>,
the <ulink url="http://freedesktop.org/Standards/shared-mime-info-spec">Shared MIME-info Database</ulink>
and the <ulink url="http://freedesktop.org/Standards/basedir-spec">Base Directory Specification</ulink>.
</para>
</formalpara>
</refsect2>
</refsect1>
</refentry>