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Running GTK+ Applications

Running GTK+ Applications — How to run and debug your GTK+ application

Running and debugging GTK+ Applications

Common commandline options

All GTK+ applications support a number of standard commandline options. These are removed from argv by gtk_init(). Modules may parse and remove further options. The X11 and Windows GDK backends parse some additional commandline options.

--gtk-module module A list of modules to load in addition to those specified in the GTK_MODULES environment variable and the gtk-modules setting.

--g-fatal-warnings 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.

--gtk-debug options A list of debug options to turn on in addition to those specified in the GTK_DEBUG environment variable. This option is only available if GTK+ has been configured with --enable-debug=yes.

--gtk-no-debug options A list of debug options to turn off. This option is only available if GTK+ has been configured with --enable-debug=yes.

The following options are really used by GDK, not by GTK+, but we list them here for completeness nevertheless.

--class class Sets the program class; see gdk_set_program_class().

--name name Sets the program name.

--gdk-debug options A list of debug options to turn on in addition to those specified in the GDK_DEBUG environment variable. This option is only available if GTK+ has been configured with --enable-debug=yes.

--gdk-no-debug options A list of debug options to turn off. This option is only available if GTK+ has been configured with --enable-debug=yes.


Environment variables

GTK+ inspects a number of environment variables in addition to standard variables like LANG, PATH, HOME or DISPLAY; mostly to determine paths to look for certain files. The X11, Windows and Framebuffer GDK backends use some additional environment variables.

GTK_DEBUG If GTK+ has been configured with --enable-debug=yes, this variable can be set to a list of debug options, which cause GTK+ to print out different types of debugging information.

misc

Miscellaneous information

plugsocket

Cross-process embedding

text

Text widget internals

tree

Tree widget internals

updates

Visual feedback about window updates

keybindings

Keybindings

multihead

Working on multiple displays

modules

Loading of modules

geometry

Size allocation

The special value all can be used to turn on all debug options.

GTK_MODULES A list of modules to load.

GTK_PATH Specifies a list of directories to search when GTK+ is looking for dynamically loaded objects such as the modules specified by GTK_MODULES, 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 .gtk-2.0 in the user's home directory, followed by the system default directory, which is libdir/gtk-2.0/modules. (If GTK_EXE_PREFIX is defined, libdir is $GTK_EXE_PREFIX/lib. Otherwise it is the libdir specified when GTK+ was configured, usually /usr/lib, or /usr/local/lib.) For each directory in this list, GTK+ actually looks in a subdirectory directory/version/host/type Where version is derived from the version of GTK+ (use pkg-config --variable=gtk_binary_version gtk+-2.0 to determine this from a script), host is the architecture on which GTK+ was built. (use pkg-config --variable=gtk_host gtk+-2.0 to determine this from a script), and type is a directory specific to the type of modules; currently it can be modules, engines or immodules corresponding to the three types of modules above. Either version, host, 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.

GTK_IM_MODULE Specifies an IM module to use in preference to the one determined from the locale.

GTK_IM_MODULE_FILE Specifies the file listing the IM modules to load. This environment variable overrides the im_module_file specified in the RC files, which in turn overrides the default value sysconfdir/gtk-2.0/gtk.immodules (sysconfdir is the sysconfdir specified when GTK+ was configured, usually /usr/local/etc.)

GTK2_RC_FILES Specifies a list of RC files to parse instead of the default ones; see Resource Files.

GTK_EXE_PREFIX If set, GTK+ uses $GTK_EXE_PREFIX/lib instead of the libdir configured when GTK+ was compiled.

GTK_DATA_PREFIX If set, makes GTK+ use $GTK_DATA_PREFIX instead of the prefix configured when GTK+ was compiled.

The following environment variables are used by GdkPixbuf, GDK or Pango, not by GTK+ itself, but we list them here for completeness nevertheless.

GDK_PIXBUF_MODULE_FILE Specifies the file listing the GdkPixbuf loader modules to load. This environment variable overrides the default value sysconfdir/gtk-2.0/gdk-pixbuf.loaders (sysconfdir is the sysconfdir specified when GTK+ was configured, usually /usr/local/etc.)

GDK_DEBUG If GTK+ has been configured with --enable-debug=yes, this variable can be set to a list of debug options, which cause GDK to print out different types of debugging information.

misc

Miscellaneous information

events

Show all events received by GDK

dnd

Information about drag-and-drop

xim

Information about XIM support

The special value all can be used to turn on all debug options.

XDG_DATA_HOME, XDG_DATA_DIRS GTK+ uses these environment variables to locate icon themes and MIME information. For more information, see Icon Theme Specification, the Shared MIME-info Database and the Base Directory Specification.