Running GTK+ Applications 3 GTK Library Running GTK+ Applications How to run and debug your GTK+ application 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. A list of modules to load in addition to those specified in the GTK_MODULES environment variable. 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. 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. 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. Sets the program class; see gdk_set_program_class(). Sets the program name. 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. A list of debug options to turn off. This option is only available if GTK+ has been configured with --enable-debug=yes. 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. 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 text Information about text widget internals tree Information about tree widget internals updates Visual feedback about window updates The special value all can be used to turn on all debug options. A list of modules to load. 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. Specifies an IM module to use in preference to the one determined from the locale. 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.) Specifies a list of RC files to parse instead of the default ones; see Resource Files. If set, GTK+ uses $GTK_EXE_PREFIX/lib instead of the libdir configured when GTK+ was compiled. 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. 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.) 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. 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.