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Important general notes
-----------------------

Date        Modules         Changes

2022-07-24  bootstrap       To specify a reference directory for the 'gnulib'
                            submodule, use the environment variable
                            GNULIB_REFDIR instead of GNULIB_SRCDIR or the
                            command-line option --gnulib-refdir instead of
                            --gnulib-srcdir.

2022-02-20  (all)           Automake >= 1.14 and Autoconf >= 2.64 are required.

2021-06-04  (all)           The license notices in source files are now really
                            stating the effective license, rather than a fake
                            GPL notice.
                            gnulib-tool no longer replaces GPL notices in source
                            files by something else.

2020-08-16  (all)           Automake >= 1.11 and Autoconf >= 2.64 are required.

2019-12-11  Support for     These modules are now supported in C++ mode as well.
            ISO C or POSIX  This means, while the autoconfiguration uses the C
            functions       compiler, the resulting header files and function
                            substitutes can be used with a matching C++ compiler
                            as well.

2019-02-14  gnulib-tool     If you use multiple --local-dir options at once:
                            The first one now has the highest priority, not the
                            last one.

2019-01-04  (all)           The meaning of the 'Link' section in the module
                            descriptions has been clarified: It overrides the
                            combined 'Link' sections from the dependencies.

2018-10-22  (all)           Automake >= 1.11 and Autoconf >= 2.63 are required.

2016-09-05  progname        There is now an alternate module 'getprogname'. It
                            defines a getprogname() function; use it to obtain
                            the name of the current program.
                            Recommended use:
                            - In a program's main() function, and associated
                              usage() and help() functions, use 'progname'.
                            - In library code, or more generally any code that
                              is not near the main() function, use
                              'getprogname'.

2013-04-24  gettext         If your project uses 'gettextize --intl' it is now
                            your responsibility to put -I$(top_builddir)/intl
                            into the Makefile.am for gnulib.

2012-06-27  elisp-comp      The module 'elisp-comp' is removed; the script is
                            not independently useful outside of automake.

2012-06-21  gnulib-tool     The option --with-tests is now implied by the
                            options --create-testdir, --test,
                            --create-megatestdir, --megatest.

2012-01-07  quotearg        In the C locale, the function will no longer use
                            the grave accent character to begin a quoted
                            string (`like this').  It will use apostrophes
                            'like these' or, in Unicode locales, single quotes
                            ‘like these’.  You may want to adjust any error
                            messages that hard code the quoting characters.

2010-09-04  gnulib-tool     The option '--import' is no longer cumulative; it
                            now expects the complete list of modules and other
                            options on the command line. If you want to
                            augment (not set) the list of modules, use the
                            new option '--add-import' instead of '--import'.

User visible incompatible changes
---------------------------------

Date        Modules         Changes

2024-02-21  *printf-posix   These modules no longer support the 'n' directive
                            by default.  In order to keep the 'n' directive
                            enabled, you need to additionally request the
                            module 'printf-with-n-directive'.

2024-02-09  strftime        This module, deprecated on 2017-07-23, is removed.
                            Use module 'nstrftime' instead.

2023-09-03  same-inode      SAME_INODE, ST_BLKSIZE and ST_NBLOCKS args
            stat-size       must be addressable lvalues.

2023-08-08  readutmp        The result element type of the function read_utmp,
                            STRUCT_UTMP, is no longer the same as the result
                            value type of the function getutxent, struct utmpx.

2023-08-03  readutmp        Some STRUCT_UTMP members can be char *,
2023-08-01                  rather than fixed-length char arrays.
                            On some platforms, the timestamp is ut_ts of type
                            struct timespec, not ut_tv of type struct timeval,
                            and ut_session is pid_t not long.
                            read_utmp's 2nd arg is now idx_t * not size_t *.
                            Link additionally with $(READUTMP_LIB).

2023-07-10  dfa             The signature of the function
                            case_folded_counterparts, declared in localeinfo.h,
                            has changed.

2023-06-10  javacomp-script  These modules now compile the Java code with option
            javacomp          '-source 1.6' or higher. As a consequence, the
                             compiler may emit notes "... uses unchecked or
                             unsafe operations". To avoid these notes, add
                             template arguments to the types or functions.

2023-04-28  largefile-required
            year2038-required
                            Modules removed, for consistency with Autoconf
                            master.  Use new module year2038-recommended
                            instead of year2038-required.

2023-03-25  mtx             This module no longer provides the function
                            call_once.  To get this function, use the new
                            separate module 'call_once'.

2023-03-08  time            This module is renamed to 'time-h'.
                            The new 'time' module now also works around an
                            inconsistency in glibc 2.31+ on Linux.

2023-02-07  c-nullptr       Rename this module to nullptr.

2023-01-21  getprogname     The include file is changed from "getprogname.h"
                            to <stdlib.h>.

2023-01-15  stdalign        This module is deprecated.  Use alignasof instead.

2023-01-13  acl             Link additionally with $(QCOPY_ACL_LIB).
            qacl
            copy-file
            supersede

2023-01-13  qcopy-acl       Link with $(QCOPY_ACL_LIB) instead of $(LIB_ACL).

2023-01-07  timer_time      Link with $(TIMER_TIME_LIB) instead of
                            $(LIB_TIMER_TIME).

2023-01-07  setlocale-null  Link with $(SETLOCALE_NULL_LIB) instead of
                            $(LIB_SETLOCALE_NULL).

2023-01-07  setlocale       Link with $(SETLOCALE_LIB) instead of
                            $(LIB_SETLOCALE).

2023-01-07  select          Link with $(SELECT_LIB) instead of $(LIB_SELECT).

2023-01-07  sched_yield     Link with $(SCHED_YIELD_LIB) instead of
                            $(LIB_SCHED_YIELD).

2023-01-07  pthread_sigmask  Link with $(PTHREAD_SIGMASK_LIB) instead of
                             $(LIB_PTHREAD_SIGMASK).

2023-01-07  posix_spawn     Link with $(POSIX_SPAWN_LIB) instead of
                            $(LIB_POSIX_SPAWN).

2023-01-07  poll            Link with $(POLL_LIB) instead of $(LIB_POLL).

2023-01-07  nanosleep       Link with $(NANOSLEEP_LIB) instead of
                            $(LIB_NANOSLEEP).

2023-01-07  mbrtowc         Link with $(MBRTOWC_LIB) instead of $(LIB_MBRTOWC).

2023-01-07  hard-locale     Link with $(HARD_LOCALE_LIB) instead of
                            $(LIB_HARD_LOCALE).

2023-01-07  getrandom       Link with $(GETRANDOM_LIB) instead of
                            $(LIB_GETRANDOM).

2023-01-07  getlogin        Link with $(GETLOGIN_LIB) instead of
            getlogin_r      $(LIB_GETLOGIN).

2023-01-07  gethrxtime      Link with $(GETHRXTIME_LIB) instead of
                            $(LIB_GETHRXTIME).

2023-01-07  fdatasync       Link with $(FDATASYNC_LIB) instead of
                            $(LIB_FDATASYNC).

2023-01-07  euidaccess      Link with $(EUIDACCESS_LIBGEN) instead of
                            $(LIB_EACCESS).

2023-01-07  duplocale       Link with $(DUPLOCALE_LIB) instead of
                            $(LIB_DUPLOCALE).

2023-01-07  clock_time      Link with $(CLOCK_TIME_LIB) instead of
                            $(LIB_CLOCK_GETTIME).

2023-01-06  file-has-acl    Link with $(FILE_HAS_ACL_LIB), not $(LIB_HAS_ACL).

2022-12-25  largefile       configure no longer enables year-2038 support,
                            unless you configure with --enable-year2038
                            or use the year2038 module.  This temporary
                            hack should go away before the year 2038.

2022-12-24  stdnoreturn     This module is deprecated.  Use _Noreturn
                            or the noreturn module instead.

2022-12-21  ctime           This module is deprecated.  Use localtime_r
                            and strftime (or even sprintf) instead.

2022-11-03  dynarray        These modules are renamed to glibc-internal/dynarray
            scratch_buffer  and glibc-internal/scratch_buffer, respectively.
                            They are not meant for general use.

2022-11-02  scratch_buffer  The function 'gl_scratch_buffer_dupfree' is removed.

2022-09-10  stdbool         This module now assumes C99 and provides C23,
                            instead of providing C99.  For the old behavior,
                            use the already-deprecated stdbool-c99 module.

2022-03-09  statat          This module is deprecated.  Use fstatat instead.

2022-01-05  stack           This module now uses idx_t instead of size_t
                            for indexes and counts.

2021-08-27  base32          These modules now use idx_t instead of size_t
            base64          for indexes and counts.

2021-07-29  (all)           Due to draft C2x, the following attributes should
                            now appear at the start of a function declaration:
                              _GL_ATTRIBUTE_DEPRECATED
                              _GL_ATTRIBUTE_MAYBE_UNUSED
                              _GL_ATTRIBUTE_NODISCARD
            attribute       Likewise for DEPRECATED, MAYBE_UNUSED, NODISCARD.
            snippet/unused-parameter
                            Likewise for _GL_UNUSED_PARAMETER.

2021-07-01  largefile       AC_SYS_LARGEFILE now also arranges for time_t
                            to be 64-bit on 32-bit GNU/Linux platforms
                            that support it (glibc 2.34 or later).

2021-03-21  fatal-signal    The function at_fatal_signal now returns an error
                            indicator.

2021-03-21  diacrit         This deprecated module is removed.

2021-03-07  mbrtowc         For single-locale optimizations, you now need to
            mbrtoc32        define GNULIB_WCHAR_SINGLE_LOCALE instead of
            wcwidth         GNULIB_WCHAR_SINGLE.

2021-02-28  parse-datetime  The parse_datetime2 function has been moved
                            to the new parse-datetime2 module, so that
                            programs that need just parse_datetime need
                            not build the fancier function.

2020-12-23  execute         These functions no longer execute scripts without
            spawn-pipe      '#!' marker through /bin/sh. To execute such a
            posix_spawn     script as a shell script, either add a '#!/bin/sh'
            posix_spawnp    marker in the first line, or specify "/bin/sh" as
                            the program to execute and the script as its first
                            argument.

2020-12-18  free            This module, obsoleted in 2008, is gone.

2020-12-14  findprog-in     The function 'find_in_given_path' now takes a 3rd
                            argument 'const char *directory'. To maintain the
                            previous behaviour, insert NULL as additional 3rd
                            argument.

2020-12-11  sh-quote        The argv argument of the 'shell_quote_argv' function
                            is now of type 'const char * const *'.  You no
                            longer need to cast read-only strings to 'char *'
                            when constructing this argument.
            execute         The prog_argv argument of the 'execute' function
                            is now of type 'const char * const *'.  You no
                            longer need to cast read-only strings to 'char *'
                            when constructing this argument.
            spawn-pipe      The prog_argv argument of the functions
                            'create_pipe_out', 'create_pipe_in',
                            'create_pipe_bidi' is now of type
                            'const char * const *'.  You no longer need to cast
                            read-only strings to 'char *' when constructing this
                            argument.
            pipe-filter-gi  The prog_argv argument of the
                            'pipe_filter_gi_create' function is now of type
                            'const char * const *'.  You no longer need to cast
                            read-only strings to 'char *' when constructing this
                            argument.
            pipe-filter-ii  The prog_argv argument of the
                            'pipe_filter_ii_execute' function is now of type
                            'const char * const *'.  You no longer need to cast
                            read-only strings to 'char *' when constructing this
                            argument.
            javaexec        The prog_argv argument of the 'execute_fn' function
                            type is now of type 'const char * const *'.  Update
                            the signature of all your implementations of this
                            type.
            csharpexec      The prog_argv argument of the 'execute_fn' function
                            type is now of type 'const char * const *'.  Update
                            the signature of all your implementations of this
                            type.

2020-12-02  spawn-pipe      The functions 'create_pipe_out', 'create_pipe_in',
                            'create_pipe_bidi' now take a 4th argument
                            'const char *directory'. To maintain the previous
                            behaviour, insert NULL as additional 4th argument.

2020-12-02  execute         The function 'execute' now takes a 4th argument
                            'const char *directory'. To maintain the previous
                            behaviour, insert NULL as additional 4th argument.

2020-10-16  hash            This module deprecates the 'hash_delete' function
                            using gcc's "deprecated" attribute.  Use the better-
                            named 'hash_remove' equivalent.

2020-08-24  diffseq         If you do not define NOTE_ORDERED to true,
                            the NOTE_DELETE and NOTE_INSERT actions might
                            not be done in order, to help cut down worst-case
                            recursion stack space from O(N) to O(log N).

2020-08-01  libtextstyle-optional  You now need to invoke
                                   gl_LIBTEXTSTYLE_OPTIONAL explicitly, because
                                   this macro now takes an optional
                                   MINIMUM-VERSION argument.

2020-08-01  libtextstyle    You now need to invoke gl_LIBTEXTSTYLE explicitly,
                            because this macro now takes an optional
                            MINIMUM-VERSION argument.

2020-06-27  clean-temp      The functions open_temp, fopen_temp now take a
                            'bool delete_on_close' argument. If in doubt, pass
                            false.

2020-06-27  tempname        The link requirements of these modules are changed
            mkdtemp         from empty to $(LIB_GETRANDOM).
            mkstemp
            mkstemps
            mkostemp
            mkostemps
            tmpfile
            stdlib-safer
            tmpfile-safer
            clean-temp
            javacomp        $(LIB_GETRANDOM) was added to the link requirements
                            of this module.

2020-05-27  read-file       The functions provided by this module now take an
                            'int flags' argument to modify the file reading
                            behavior.  The read_binary_file function has been
                            removed as it is no longer necessary.

2020-04-27  getdate         This deprecated module is removed. Use the module
                            'parse-datetime' instead. Instead of
                              #include "getdate.h"
                            write
                              #include "parse-datetime.h"
                            The function get_date is renamed to parse_datetime.

2020-04-27  realloc         This deprecated module is removed. Use the module
                            'realloc-gnu' instead.

2020-04-27  calloc          This deprecated module is removed. Use the module
                            'calloc-gnu' instead.

2020-04-27  malloc          This deprecated module is removed. Use the module
                            'malloc-gnu' instead.

2020-04-27  fnmatch-posix   This deprecated module is removed. Use the module
                            'fnmatch' instead.

2020-04-27  pipe            This deprecated module is removed. Use the module
                            'spawn-pipe' instead. Instead of
                              #include "pipe.h"
                            write
                              #include "spawn-pipe.h"

2020-04-27  getopt          This deprecated module is removed. Please choose
                            among getopt-posix and getopt-gnu. getopt-gnu
                            provides "long options" and "options with optional
                            arguments", getopt-posix doesn't.

2020-04-27  rename-dest-slash  This deprecated module is removed. Use the
                               module 'rename' instead.

2020-04-27  unictype/bidicategory-*  These deprecated modules are removed. Use
                                     the modules unictype/bidiclass-* instead.

2020-03-28  dosname         On native Windows, OS/2, DOS,
                            IS_RELATIVE_FILE_NAME("c:") now returns false.

2020-03-28  filename        The macro IS_ABSOLUTE_PATH is deprecated. Use
                            IS_ABSOLUTE_FILE_NAME instead.
                            The macro IS_PATH_WITH_DIR is deprecated. Use
                            IS_FILE_NAME_WITH_DIR instead.

2020-02-22  fchownat        This module no longer defines the functions
                            'chownat' and 'lchownat'.  Program that need these
                            functions should add the module 'chownat' to the
                            list of imported modules.

2020-02-22  fchmodat        This module no longer defines the functions
                            'chmodat' and 'lchmodat'.  Program that need these
                            functions should add the module 'chmodat' to the
                            list of imported modules.

2020-02-07  fchmodat        When applied to non-symlinks, these now act like
            lchmod          chmod (the BSD behavior, which POSIX requires for
                            fchmodat + AT_SYMLINK_NOFOLLOW), instead of failing
                            (the GNU/Linux behavior through glibc 2.31).
                            Future versions of GNU/Linux are planned to act as
                            per POSIX and BSD.

2020-01-15  gc-pbkdf2-sha1  This module is deprecated.  Use gc-pbkdf2 instead.

2019-12-12  dfa             Its API now uses ptrdiff_t instead of size_t.

2019-12-11  dfa             To call dfamust, one must now call dfaparse
                            without yet calling dfacomp.  This fixes a bug
                            introduced on 2018-10-22 that broke dfamust.

2019-12-07  xstrtol         This module no longer defines the function
            xstrtoll        'xstrtol_fatal'.  Program that need this function
            xstrtoimax      should add the module 'xstrtol-error' to the list
            xstrtoumax      of imported modules.

2019-05-90  verify          verify_true (deprecated 2011-06-15) is removed.

2019-03-16  fatal-signal    The function that you pass to at_fatal_signal now