4 This is GLib version @GLIB_VERSION@. GLib is the low-level core
5 library that forms the basis for projects such as GTK+ and GNOME. It
6 provides data structure handling for C, portability wrappers, and
7 interfaces for such runtime functionality as an event loop, threads,
8 dynamic loading, and an object system.
10 The official ftp site is:
11 ftp://ftp.gtk.org/pub/glib
13 The official web site is:
16 Information about mailing lists can be found at
17 http://www.gtk.org/mailing-lists.html
19 To subscribe: mail -s subscribe gtk-list-request@gnome.org < /dev/null
20 (Send mail to gtk-list-request@gnome.org with the subject "subscribe")
25 See the file 'INSTALL'
30 * It is no longer necessary to use g_thread_init() or to link against
31 libgthread. libglib is now always thread-enabled. Custom thread
32 system implementations are no longer supported (including errorcheck
35 * The thread and synchronisation APIs have been updated.
36 GMutex and GCond can be statically allocated without explicit
37 initialisation, as can new types GRWLock and GRecMutex. The
38 GStatic_______ variants of these types have been deprecated. GPrivate
39 can also be statically allocated and has a nicer API (deprecating
40 GStaticPrivate). Finally, g_thread_create() has been replaced with a
41 substantially simplified g_thread_new().
43 * The g_once_init_enter()/_leave() functions have been replaced with
44 macros that allow for a pointer to any gsize-sized object, not just a
45 gsize*. The assertions to ensure that a pointer to a correctly-sized
46 object is being used will not work with generic pointers (ie: (void*)
47 and (gpointer) casts) which would have worked with the old version.
49 * It is now mandatory to include glib.h instead of individual headers.
51 * The -uninstalled variants of the pkg-config files have been dropped.
53 * For a long time, gobject-2.0.pc mistakenly declared a public
54 dependency on gthread-2.0.pc (when the dependency should have been
55 private). This means that programs got away with calling
56 g_thread_init() without explicitly listing gthread-2.0.pc among their
59 gthread has now been removed as a gobject dependency, which will cause
60 such programs to break.
62 The fix for this problem is either to declare an explicit dependency
63 on gthread-2.0.pc (if you care about compatibility with older GLib
64 versions) or to stop calling g_thread_init().
69 * GObject includes a generic marshaller, g_cclosure_marshal_generic.
70 To use it, simply specify NULL as the marshaller in g_signal_new().
71 The generic marshaller is implemented with libffi, and consequently
72 GObject depends on libffi now.
77 * The GApplication API has changed compared to the version that was
78 included in the 2.25 development snapshots. Existing users will need
89 * It is now allowed to call g_thread_init(NULL) multiple times, and
90 to call glib functions before g_thread_init(NULL) is called
91 (although the later is mainly a change in docs as this worked before
92 too). See the GThread reference documentation for the details.
94 * GObject now links to GThread and threads are enabled automatically
95 when g_type_init() is called.
97 * GObject no longer allows to call g_object_set() on construct-only properties
98 while an object is being initialized. If this behavior is needed, setting a
99 custom constructor that just chains up will re-enable this functionality.
101 * GMappedFile on an empty file now returns NULL for the contents instead of
102 returning an empty string. The documentation specifically states that code
103 may not rely on nul-termination here so any breakage caused by this change
104 is a bug in application code.
106 Notes about GLib 2.22
107 =====================
109 * Repeated calls to g_simple_async_result_set_op_res_gpointer used
110 to leak the data. This has been fixed to always call the provided
113 Notes about GLib 2.20
114 =====================
116 * The functions for launching applications (e.g. g_app_info_launch() +
117 friends) now passes a FUSE file:// URI if possible (requires gvfs
118 with the FUSE daemon to be running and operational). With gvfs 2.26,
119 FUSE file:// URIs will be mapped back to gio URIs in the GFile
120 constructors. The intent of this change is to better integrate
121 POSIX-only applications, see bug #528670 for the rationale. The
122 only user-visible change is when an application needs to examine an
123 URI passed to it (e.g. as a positional parameter). Instead of
124 looking at the given URI, the application will now need to look at
125 the result of g_file_get_uri() after having constructed a GFile
126 object with the given URI.
128 Notes about GLib 2.18
129 =====================
131 * The recommended way of using GLib has always been to only include the
132 toplevel headers glib.h, glib-object.h and gio.h. GLib enforces this by
133 generating an error when individual headers are directly included.
134 To help with the transition, the enforcement is not turned on by
135 default for GLib headers (it is turned on for GObject and GIO).
136 To turn it on, define the preprocessor symbol G_DISABLE_SINGLE_INCLUDES.
138 Notes about GLib 2.16
139 =====================
141 * GLib now includes GIO, which adds optional dependencies against libattr
142 and libselinux for extended attribute and SELinux support. Use
143 --disable-xattr and --disable-selinux to build without these.
145 Notes about GLib 2.10
146 =====================
148 * The functions g_snprintf() and g_vsnprintf() have been removed from
149 the gprintf.h header, since they are already declared in glib.h. This
150 doesn't break documented use of gprintf.h, but people have been known
151 to include gprintf.h without including glib.h.
153 * The Unicode support has been updated to Unicode 4.1. This adds several
154 new members to the GUnicodeBreakType enumeration.
156 * The support for Solaris threads has been retired. Solaris has provided
157 POSIX threads for long enough now to have them available on every
160 * 'make check' has been changed to validate translations by calling
161 msgfmt with the -c option. As a result, it may fail on systems with
162 older gettext implementations (GNU gettext < 0.14.1, or Solaris gettext).
163 'make check' will also fail on systems where the C compiler does not
164 support ELF visibility attributes.
166 * The GMemChunk API has been deprecated in favour of a new 'slice
167 allocator'. See the g_slice documentation for more details.
169 * A new type, GInitiallyUnowned, has been introduced, which is
170 intended to serve as a common implementation of the 'floating reference'
171 concept that is e.g. used by GtkObject. Note that changing the
172 inheritance hierarchy of a type can cause problems for language
173 bindings and other code which needs to work closely with the type
174 system. Therefore, switching to GInitiallyUnowned should be done
175 carefully. g_object_compat_control() has been added to GLib 2.8.5
176 to help with the transition.
178 Notes about GLib 2.6.0
179 ======================
181 * GLib 2.6 introduces the concept of 'GLib filename encoding', which is the
182 on-disk encoding on Unix, but UTF-8 on Windows. All GLib functions
183 returning or accepting pathnames have been changed to expect
184 filenames in this encoding, and the common POSIX functions dealing
185 with pathnames have been wrapped. These wrappers are declared in the
186 header <glib/gstdio.h> which must be included explicitly; it is not
187 included through <glib.h>.
189 On current (NT-based) Windows versions, where the on-disk file names
190 are Unicode, these wrappers use the wide-character API in the C
191 library. Thus applications can handle file names containing any
192 Unicode characters through GLib's own API and its POSIX wrappers,
193 not just file names restricted to characters in the system codepage.
195 To keep binary compatibility with applications compiled against
196 older versions of GLib, the Windows DLL still provides entry points
197 with the old semantics using the old names, and applications
198 compiled against GLib 2.6 will actually use new names for the
199 functions. This is transparent to the programmer.
201 When compiling against GLib 2.6, applications intended to be
202 portable to Windows must take the UTF-8 file name encoding into
203 consideration, and use the gstdio wrappers to access files whose
204 names have been constructed from strings returned from GLib.
206 * Likewise, g_get_user_name() and g_get_real_name() have been changed
207 to return UTF-8 on Windows, while keeping the old semantics for
208 applications compiled against older versions of GLib.
210 * The GLib uses an '_' prefix to indicate private symbols that
211 must not be used by applications. On some platforms, symbols beginning
212 with prefixes such as _g will be exported from the library, on others not.
213 In no case can applications use these private symbols. In addition to that,
214 GLib+ 2.6 makes several symbols private which were not in any installed
215 header files and were never intended to be exported.
217 * To reduce code size and improve efficiency, GLib, when compiled
218 with the GNU toolchain, has separate internal and external entry
219 points for exported functions. The internal names, which begin with
220 IA__, may be seen when debugging a GLib program.
222 * On Windows, GLib no longer opens a console window when printing
223 warning messages if stdout or stderr are invalid, as they are in
224 "Windows subsystem" (GUI) applications. Simply redirect stdout or
225 stderr if you need to see them.
227 * The child watch functionality tends to reveal a bug in many
228 thread implementations (in particular the older LinuxThreads
229 implementation on Linux) where it's not possible to call waitpid()
230 for a child created in a different thread. For this reason, for
231 maximum portability, you should structure your code to fork all
232 child processes that you want to wait for from the main thread.
234 * A problem was recently discovered with g_signal_connect_object();
235 it doesn't actually disconnect the signal handler once the object being
236 connected to dies, just disables it. See the API docs for the function
237 for further details and the correct workaround that will continue to
238 work with future versions of GLib.
243 Bugs should be reported to the GNOME bug tracking system.
244 (http://bugzilla.gnome.org, product glib.) You will need
245 to create an account for yourself.
247 In the bug report please include:
249 * Information about your system. For instance:
251 - What operating system and version
252 - For Linux, what version of the C library
254 And anything else you think is relevant.
256 * How to reproduce the bug.
258 If you can reproduce it with one of the test programs that are built
259 in the tests/ subdirectory, that will be most convenient. Otherwise,
260 please include a short test program that exhibits the behavior.
261 As a last resort, you can also provide a pointer to a larger piece
262 of software that can be downloaded.
264 * If the bug was a crash, the exact text that was printed out
265 when the crash occured.
267 * Further information such as stack traces may be useful, but
273 Patches should also be submitted to bugzilla.gnome.org. If the
274 patch fixes an existing bug, add the patch as an attachment
277 Otherwise, enter a new bug report that describes the patch,
278 and attach the patch to that bug report.
280 Patches should be in unified diff form. (The -up option to GNUdiff.)