Overview of changes in GLib 2.87.3, 2026-02-25

• Improved support for GNotification on Windows (#3867, #3869, work by
  Oscar Pernia Moreno)

• Fix module lookups via GModule on Cygwin (#3741, work by Ailin Nemui)

• Fix local timezone lookup with nested symlinks in /etc/localtime (#3816,
  work by Alessandro Astone)

• Fix ordering and sequential consistency of gatomic memory barriers on MSVC
  and fallback GCC code paths (#3829, #3852, work by Luca Bacci)

• Fix various integer overflow bugs (#3870, #3871, #3872, CVE-2026-1484,
  CVE-2026-1485, CVE-2026-1489, work by Marco Trevisan)

• Add GSocketControlMessage subclasses for receiving IP_TOS and
  IPV6_TCLASS (!4846, work by Jakub Adam)

• Support polling more than 1024 FDs on macOS (!4953, work by Ihar Hrachyshka)

• Remove platform-specific backward compatibility from GLib-2.0 as it’s
  impossible to support (#3839, !4881, work by Marco Trevisan)

• Improve introspection annotations for delimiters on g_strsplit_set() (this
  may require changes in introspection bindings)

• Basic support for building and running some functionality on tvOS and watchOS
  (!4992, work by Nirbheek Chauhan)

• Add g_get_monotonic_time() variant with nanosecond precision (!5004, work
  by Benjamin Otte)

• Bugs fixed:

  • #3628 Add test suite for gdbus tool (Philip Withnall)
    
  • #3741 GModule incorrectly searches for cyg....so instead of cyg....dll on
    Cygwin (Ailin Nemui)
    
  • #3816 Local timezone wrongly considered to be UTC if timezone file in
    /usr/share/zoneinfo is a symlink (Alessandro Astone)
    
  • #3829 [RFC] gatomic: Memory barriers should be reversed (Luca Bacci)
    
  • #3839 Broken Unix/Win32 specific GIRs
    
  • #3852 MSVC and GCC-fallback atomics are not sequentially consistent (Luca
    Bacci)
    
  • #3863 Iterating over a short (preallocated) GVariant bytestring invalidly
    refs a NULL GBytes (Christian Hergert)
    
  • #3865 callable-info/native-address test fails on big endian (Alessandro
    Astone)
    
  • #3867 win32: Notifications without body won't show up
    
  • #3869 gnotification-win32: Re-initialize tray icon if explorer.exe got
    restarted
    
  • #3870 (CVE-2026-1484) (YWH-PGM9867-168) Integer Overflow -> Buffer Underflow
    on Glib through glib/gbase64.c via g_base64_encode_close() leads to OOB
    Write (Marco Trevisan (Treviño))
    
  • #3871 (CVE-2026-1485) (#YWH-PGM9867-169) Buffer underflow on Glib through
    gio/gcontenttype-fdo.c via parse_header() lead to OOB Read/Write (Marco
    Trevisan (Treviño))
    
  • #3872 (CVE-2026-1489) (#YWH-PGM9867-171) Integer Overflow on Glib through
    glib/guniprop.c via output_marks() lead to OOB Write in
    glib/gutf8.c:g_unichar_to_utf8() (Marco Trevisan (Treviño))
    
  • #3877 hash test failing randomly on MSYS2 (Luca Bacci)
    
  • #3880 Integer overflow in gio-launch-desktop from over-long environment
    variables (Philip Withnall)
    
  • #3881 Integer overflow in g_resource_find_overlay() from over-long
    environment variables (Philip Withnall)
    
  • #3883 Integer overflow in g_path_get_basename() when passed an extremely
    long path (length ≈SSIZE_MAX) (Philip Withnall)
    
  • #3886 Crash in gdbus-tool on invalid --method argument format (Philip
    Withnall)
    
  • #3895 date_time_lookup_era unsafely caches setlocale pointer (Philip
    Withnall)
    
  • !4846 gio: Add GSocketControlMessage subclasses for receiving IP_TOS and
    IPV6_TCLASS
    
  • !4953 darwin: Support g_poll:maxfd >= FD_SETSIZE
    
  • !4957 gstrfuncs: Annotate g_strsplit_set() as taking a byte array of
    delimiters
    
  • !4966 gio-tool-{copy,move}: Fix incorrect transfer rate calculation and
    improve visualization
    
  • !4968 markup: Better error reporting
    
  • !4970 gutf8: Clarify docs about negative return values
    
  • !4971 gutf8: Use size_t internally for some length calculations
    
  • !4976 docs: Fix a typo and specify a codeblock is C
    
  • !4977 gobject: Add nullable annotation to g_weak_ref_get return value
    
  • !4982 markup: Initialize tag positions
    
  • !4985 ci/fedora, glib/casemap: Add tests for the Azerbaijani cases
    
  • !4987 giomodule: Simplify macro usage for getting the giomodule dir, don't
    use it on iOS
    
  • !4991 gio/gdatainputstream: Mark bytes as potentially unused
    
  • !4992 Disable or stub out fork/execv* usage when targeting tvOS and watchOS
    
  • !4993 Windows: Add test-profile
    
  • !4996 Fix some small regressions in the iOS build
    
  • !4997 meson: Add guesses for compute_int to speed up cross-compile setup
    
  • !5002 Update Lithuanian translation
    
  • !5004 Add g_get_monotonic_time() variant with nanosecond precision
    
  • !5006 gfileutils: Fix a regression in g_path_get_basename() for plain
    files
    
  • !5008 Update Swedish translation
    
  • !5009 Update Kazakh translation
    
  • !5011 Update Romanian translation
    
  • !5012 Compilation fixes for CLangCL and older MSVC
    
  • !5013 Update Czech translation
    
  • !5014 Update Russian translation
    
  • !5015 GApplication: make send_notification / withdraw_notification thread-
    safe
    
  • !5018 Update Ukrainian translation
    
  • !5020 Update Romanian translation
    
  • !5021 Update Lithuanian translation
    
  • !5023 Update Greek translation
    
  • !5024 Update Chinese (China) translation
    
  • !5025 Update Slovenian translation
    
  • !5026 Update Brazilian Portuguese translation
    
  • !5027 Update Basque translation
    
  • !5028 gvalue: Update default terminology to initial
    
  • !5029 Update Bulgarian translation
    
  • !5031 Update Galician translation
    
  • !5032 Update Hungarian translation
    
  • !5034 Fix const qualifiers where discarded
    
  • !5036 Address more size types issues
    
  • !5038 Update Kazakh translation
    
  • !5039 Update Catalan translation
    
  • !5040 gsettings-tool: Fix leaks when running set commands
    
  • !5041 gsettings-tool: Fix leaks when specifying invalid schemas
    
  • !5042 Update Spanish translation
    

• Translation updates:

  • Basque (Asier Saratsua Garmendia)
    
  • Bulgarian (Alexander Alexandrov Shopov)
    
  • Catalan (Victor Dargallo)
    
  • Chinese (China) (luming zh)
    
  • Czech (Daniel Rusek)
    
  • Galician (Fran Diéguez)
    
  • Greek, Modern (1453-) (Efstathios Iosifidis)
    
  • Hungarian (Balázs Úr)
    
  • Kazakh (Baurzhan Muftakhidinov)
    
  • Lithuanian (Aurimas Aurimas Černius)
    
  • Portuguese (Brazil) (Juliano de Souza Camargo)
    
  • Romanian (Antonio Marin)
    
  • Russian (Artur S0)
    
  • Slovenian (Martin)
    
  • Spanish (Daniel Mustieles)
    
  • Swedish (Anders Jonsson)
    
  • Ukrainian (Yuri Chornoivan)