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   2024-03-08 20:00:54 by Amitai Schleier | Files touched by this commit (3) | Package updated
Log message:
xapian: update to 1.4.25. Changes:

API:

* MSet::get_eset(): Don't fetch the collection frequency for each term unless
  we're using the Bo1EWeight expansion scheme which actually needs it.  In a
  simple test this reduced the time taken to do a search and generate expand
  terms by a third.  Partly addresses #264.

* QueryParser::parse_query(): Fix parse error when using FLAG_CJK_NGRAM (aka
  FLAG_NGRAMS) with a query string which has non-CJK followed by whitespace,
  CJK, and more non-CJK.  Patch from Robert Stepanek
  (https://github.com/xapian/xapian/pulls/331).

testsuite:

* unittest: Improve sparse file detection by using SEEK_HOLE, which is
  specified by POSIX and seems to be widely supported.  On platforms without it
  or on an FS with a > 128K block size we will skip the tests involving a 4GB
  file, but that's acceptable.  On ZFS st_blocks reports the number of blocks
  after compression and also lags behind when data has only been committed to
  the journal, which means our previous check based on st_blocks couldn't be
  made to work without potentially falsely detecting sparse file support.
  Fixes #823, reported by someplaceguy.

* apitest: Enable adddoc2 and adddoc5 testcases for sharded databases.  We
  now just skip the TermIterator::get_termfreq() checks in this case.

glass backend:

* Check Btree level value from disk is in range, which avoids potential out of
  range access on corrupt database.  Fixes #824, reported by group13.

* Reject invalid blocksize read from corrupted version file.  Throw
  DatabaseCorruptError if value is out of range or not a power of two.

* Optimise allterms iteration.  Most terms don't contain any zero bytes, and
  for such terms the key for the first chunk in the termlist table is just the
  termname so no decoding is needed when advancing the iterator.  This optimisation
  is 8.4% faster in a simple test of iterating allterms via xapian-delve.

* Compaction of an empty non-optional table now gives an empty output, whereas
  previous it was one block in size (8K by default).  This isn't important in
  general as the non-optional tables are not likely to be empty in a real
  database, but it's helpful for making small test database and it seems weird
  that compaction would make a database much larger in percentage terms in this
  edge case.

chert backend:

* Check Btree level value from disk is in range, which avoids potential out of
  range access on corrupt database.  Fixes #824, reported by group13.

build system:

* configure: DragonflyBSD automatically pulls in library dependencies, so set
  link_all_deplibs_CXX=no there.

documentation:

* Document allterms_begin() and termlist_begin() iteration order.  Thanks to
  Eric Wong for querying this.

* Document TermIterator::get_termfreq() quirk.  In the case of a TermIterator
  from termlist_begin() on a Document from a sharded database, you get term
  frequencies from just the shard.  Fixes #423

portability:

* Support building on platforms without AI_NUMERICSERV (e.g. macOS 10.5).
  Patch from Sergey Fedorov.
   2023-07-10 17:07:26 by Amitai Schleier | Files touched by this commit (8)
Log message:
Update to 1.4.23. From the changelog:

API:

* Add `FLAG_NGRAMS` as a preferred new alias for `FLAG_CJK_NGRAM` and
  `SNIPPET_NGRAMS` as a preferred new alias for `SNIPPET_CJK_NGRAM`.
  In the next release series these features have been expanded to cover many
  more languages so the "CJK" in the name has become inaccurate as it \ 
stands
  for "Chinese, Japanese and Korean").

* Database::check(): Improve the exception message for an empty filename from
  "Failed to rewind file descriptor -1 (Bad file descriptor)" to \ 
"Couldn't find
  Xapian database or table to check (No such file or directory)".

testsuite:

* The test harness now supports generated databases for all backends and
  all testcases which can use generated databases now do, which together
  improve test coverage as we now run many testcases under more backends.
  Generated databases can also be cached, which helps speed up the test
  suite.

* Remove some testcases which are now redundant with other testcases or
  no longer useful for other reasons.

* Add regression test for #781, reported by Germán M. Bravo.  This bug was
  fixed 4 years in 1.4.12 but a clean regression test only became possible
  thanks to changes in this release.

* The test harness would attempt to throw a Xapian::Database (rather than
  Xapian::DatabaseError) if it failed to rename a temporary database to its
  final name.  This would fail because there wasn't a database called "rename
  failed".  Reported by stark3y on #xapian.

* apitest: Fix exceed32bitcombineddb1 testcase (which only runs with
  --enable-64bit-docid).

* apitest: Fix nomoredocids1 when configured with --enable-64bit-docid.

* Add testcase for removal of positions for replaced doc (regression test for
  bug in git master not present in 1.4.x).

* unittest: Unit test block file functions

* Stop using std::endl in tests since this seems to be C++ best practice
  as it causes a flush of the stream, which is rarely actually wanted.  Also
  often the replacement \n can be combined with a string literal.

* Use Xapian::docid for document ids in testcases.  Using `int` or `size_t`
  works, but is less correct and can trigger compiler warnings because not all
  values are representable.

matcher:

* BM25PlusWeight: With some parameter combinations we were requesting stats we
  didn't actually need.  Confirmed with Vivek Pal on IRC.

glass backend:

* Avoid unnecessary copying of data when adding an item to a B-tree table which
  should speed up indexing a bit.

* xapian-check: If the first chunk for a term is a continuation chunk, the
  affected term was missing from the error message.

* xapian-check: We now report the document id as context in many more error
  messages.

chert backend:

* Fix wdf upper bounds used when search a modified chert-format
  WritableDatabase object.  A bug introduced in 1.4.19 meant we were using the
  wdf upper bounds from the last committed version of the database.  This bug
  could cause assertion failures when configured with --enable-assertions.

remote backend:

* Fix thread-safety issue starting remote prog server.  Previously we did some
  memory allocation in the child process after fork() but before we exec-ed the
  specified program, but in a multi-threaded program (which libxapian might be
  used in) it's only safe to call async-signal-safe functions in the child
  process after fork() until exec, and malloc, etc aren't async-signal-safe.

* If we failed to open /dev/null in the child process while starting a remote
  prog server, we would try to throw an exception.  That's not going to work
  well so now we just call `_exit(-1)`.

inmemory backend:

* Throw exception on docid overflow like we do in other backends.

build system:

* configure: When probing for socklen_t or equivalent include the same headers
  as we do in the code to reduce the risk of configure deciding to use
  socklen_t but it not getting defined in the code.

* configure: When probing if a particular compiler or linker option is
  supported, we were relying on the compiler exit status but some compilers
  only warn about unknown options.  We now inspect the compiler's stderr
  output to try to detect such cases.

* configure: Avoid compiler warning during GCC version check when compiler
  needs an option to enable C++11 support.

* Avoid running pwd since the directories we need are available in automake
  variables.

documentation:

* Suggest protocol buffers for structured document data.  Fixes #53.

* Clarify documentation for release() methods.

* Fix typo "shared database" to "sharded database" in API docs.

* Document that transactions aren't atomic across shards.

tools:

* xapian-progsrv,xapian-tcpsrv: Support multiple DBs with --writable.

* xapian-tcpsrv: Fix default timeouts in --help output which have been reported
  as the name of the constant rather than its value since 1.3.3.

* xapian-tcpsrv: When --one-shot is specified, don't do the usual test open of
  the specified database(s) as it doesn't really seem useful in this case.  The
  test harness uses --one-shot so this reduces overhead when running remote
  tests.

* Stop using std::endl in tools since this seems to be C++ best practice
  as it causes a flush of the stream, which is rarely actually wanted.  Also
  often the replacement \n can be combined with a string literal.

portability:

* Don't pass mode to open when it's unused as this triggers "missing O_CREAT or
  O_TMPFILE?" warnings when compiling for Android.

* Stop using INFINITY macro.  If the implementation supports floating point
  infinities then HUGE_VAL gives us infinity as a double directly.  If not,
  then it's the maximum finite value of a double.

* Don't auto-enable _FORTIFY_SOURCE on mingw or mingw-w64.  Enabling
  _FORTIFY_SOURCE on newer mingw-w64 requires linking with -lssp so we
  attempted to stop automatically enabling it there in 1.4.19 but this fix
  didn't actually work.  Trying to get this to work automatically has proved
  difficult and I couldn't find evidence that _FORTIFY_SOURCE was actually
  supported on mingw.  If it is, enabling manually will still work.

* Fix mingw32 build with C++17 compiler, which ends up with std::byte
  conflicting with byte typedefs in system headers, due to us having `using
  namespace std;` in some of our internal headers.  Switch the ones which
  are causing problems to more targetted `using std::string;`, etc instead.

* Fix WIN32 build with --disable-backend-remote which was failing because we
  were always trying to build common/socket_utils.cc which fails because
  SOCKLEN_T hasn't been probed.  Fixes #821, reported by mgautier.

* soaktest: Use C++11 <random> which is more portable than random().

* In WIN32 builds, pass the program pathname separately to CreateProcess()
  which is apparently more robust if the program pathname contains spaces.

* Stop trying to set Microsoft-specific SO_EXCLUSIVEADDRUSE option on our
  listening sockets.  It's not possible to set both SO_REUSEADDR and
  SO_EXCLUSIVEADDRUSE so this call will always fail with WSAEINVAL, but we
  were ignoring these errors because SO_EXCLUSIVEADDRUSE required admin
  privileges in older OS versions.

* Suppress MSVC deprecation warning for GetVersionEx since none of the
  suggested replacements seems to actually provide the functionality we are
  using from it.

* Fix some warnings from MSVC in the fallback code for overflow-checked
  arithmetic.

* Support Enquire::set_time_limit() on GNU Hurd since Hurd now implements
  timer_create().

* Remove lingering traces of IRIX support as it's been dead for many years.

debug code:

* Fix build failure with --enable-assertions due to incorrect variable name in
  assertion.  Patch from Alexei Kharchev in
  https://github.com/xapian/xapian/pull/327.

* Fix GCC warning with --enable-log.

* Fix debug logging for 3 GlassDatabase methods to log their parameter.

* Add a mechanism to support debug logging templated return types containing
  commas.  This was added to fix a build failure on master with --enable-log
  reported by ttyS3.

Bindings:

Documentation:

* Where we document how to build the bindings, link to the download page so
  the reader can easily find the source to download.  Reported by John G. Heim.

* Update lists of debian packages to install for bindings development to
  show be for the latest stable release and the one before (bookworm and
  bullseye).

* HACKING: Fix typos in deprecation warning section

* HACKING: Update link to Pike bindings

* HACKING: Document issues caused by macOS SIP.  Fixes #732.

General:

* Add `FLAG_NGRAMS` as a preferred new alias for `FLAG_CJK_NGRAM` and
  `SNIPPET_NGRAMS` as a preferred new alias for `SNIPPET_CJK_NGRAM`.
  In the next release series these features have been expanded to cover many
  more languages so the "CJK" in the name has become inaccurate as it \ 
stands
  for "Chinese, Japanese and Korean").

* Avoid running pwd in makefiles since the directories we need are available in
  automake variables.

CSharp:

* SmokeTest.cs: Fix some incorrect messages if testcases fail.

* Smoketest.cs: Test stemmer description.

Lua:

* Update docs for supported Lua versions.

Perl:

* Generate HTML docs for each class.

* Document all QueryParser FLAG_* constants.

* Update one place which didn't correctly indicate the current status of the
  Perl bindings.  Fixes #523.

Python:

* Fix bug in wrapper for xapian.Query when constructing OP_WILDCARD queries.
  A workaround for this bug which works with existing releases is to pass
  0 for the third and fourth optional parameters like so:

  xapian.Query(xapian.Query.OP_WILDCARD, "xyz", 0, 0)

Python3:

* Fix bug in wrapper for xapian.Query when constructing OP_WILDCARD queries.
  A workaround for this bug which works with existing releases is to pass
  0 for the third and fourth optional parameters like so:

  xapian.Query(xapian.Query.OP_WILDCARD, "xyz", 0, 0)

Ruby:

* Improve documentation about __call__ methods.
   2022-12-25 00:10:04 by Thomas Klausner | Files touched by this commit (1)
Log message:
xapian: remove comment about csharp-xapian
   2022-12-21 16:29:10 by Thomas Klausner | Files touched by this commit (1)
Log message:
xapian: note that updating the version WILL break csharp-xapian
   2022-09-25 14:24:54 by Amitai Schleier | Files touched by this commit (3)
Log message:
Update to 1.4.21. From the changelog:

glass backend:

* Avoid throwing InvalidArgument when searching for overlong terms in some
  cases.  Such terms can't match, but are valid to query for.  Patch from
  Robert Stepanek in https://github.com/xapian/xapian/pull/313.

chert backend:

* Avoid throwing InvalidArgument when searching for overlong terms in some
  cases.  Such terms can't match, but are valid to query for.

build system:

* Clean up cygwin and mingw configure checks.  When we check $host_os, always
  anchor at the start (e.g. cygwin* not *cygwin*), and check for msys* as well
  since that's a derivative of cygwin and behaves similarly for the things
  we're checking here.

* Update to use AX_CXX_COMPILE_STDCXX which is a replacement for
  AX_CXX_COMPILE_STDCXX_11 (which we were using) which also supports newer C++
  standards versions which will be useful.  For C++11 the only difference seems
  to be that the macro now checks for attribute support - we use C++11
  attributes so that seems a good thing.

documentation:

* INSTALL: Restructure MSVC section for clarity.

* INSTALL: Mention -D_FORTIFY_SOURCE=3 too (fairly new - requires GCC 12).

* Consistently say "macOS" not "Mac OS X", "OS X", etc.

* admin_notes.rst:

  + Update locking section to cover Open File Description locks

  + Add some discussion of block sizes (fixes #819, reported by mgautier)

  + Fix cut-and-paste error - we were suggesting that the docdata table only
    exists if there's positional data.  Noted by Gaurav Arora.

  + Improve markup

examples:

* Stop using std::endl in examples since this seems to be C++ best practice
  as it causes a flush of the stream, which is rarely actually wanted.  Also
  often the replacement \n can be combined with a string literal.

portability:

* Stop trying to check for incompatible C++ ABI between the compiler used to
  build xapian-core and the compiler used to build code using xapian-core.

  This check was helpful in the GCC 3 days, but ABI versions 2 and up are
  compatible aside from obscure corner cases, and GCC now defaults to using the
  latest ABI version it supports.  The result is that this check is no longer
  useful enough to justify the noise.

  We still check for incompatible _GLIBCXX_DEBUG between the library and
  application builds, since that will cause things not to work, and the normal
  error message doesn't make it clear what's wrong.

  Reported by David Bremner.

* Fix new warnings from GCC 12.

* Avoid undefined value use when unpacking a key in a corrupted glass docdata
  table.  We now skip further checks on the entry in this case.

* Merge allocations in MSVC directory reading compatibility code so we can
  allocate in a single malloc() call.

* Add accept() wrapper which checks an assumption that Microsoft's SOCKET type
  only actually holds 32 bit values even in 64 bit platforms and throws an
  exception if violated.

* Eliminate a use of sprintf.

* Squash some unhelpful MSVC deprecation warnings.

* Declare dummy invalid parameter handler noexcept to fix a warning from MSVC.

* Include <stdlib.h> in configure check for sys_errlist as that's where it is
  with mingw and MSVC.

debug code:

* Fix debug logging for Xapian::Internal::intrusive_ptr<const T>.

  GCC 12.2 warned about infinite recursion in the old version, and this seems
  to be the case.  This code has been there a long time, but is only used when
  debug logging is enabled.  It does seem to be used, so presumably nobody's
  tried to log something which triggered it.

Updating during the freeze for the bug and portability fixes.
   2022-01-08 17:30:35 by Amitai Schleier | Files touched by this commit (1)
Log message:
Oops, missed updating the language bindings in previous. Spotted by wiz@.
   2022-01-02 10:31:20 by Amitai Schleier | Files touched by this commit (2)
Log message:
Update to 1.4.19. From the changelog:

API:

* New QueryParser::FLAG_NO_POSITIONS flag.  With this flag enabled, any query
  operations which would use positional information are replaced by the nearest
  equivalent which doesn't (so phrase searches, NEAR and ADJ will result in
  OP_AND).  This is intended to replace the automatic conversion of OP_PHRASE,
  etc to OP_AND when a database has no positional information, which will no
  longer happen in the release series after 1.4.

* Give a compile error for code which adds a Database to WritableDatabase.

  Prior to 1.4.19, this compiled and effectively created a \ 
"black-hole" shard
  which quietly discarded any changes made to it.

  In 1.4.19 it's still possible to perform this operation by assigning the
  WritableDatabase to a Database first, which is harder to fix.  This case
  throws an exception on git master where it's easier to address.

  Reported by David Bremner on #xapian.

* Fix TermIterator::skip_to() with sharded databases which sometimes was
  failing to advance all the way to the requested term.  Uncovered while
  addressing warning from GCC's -Wduplicated-cond, reported by dcb in #816.

* Clamp edit distance to one less than the length of the word we've been asked
  to correct, which makes the algorithm we use more efficient.  We already
  require suggestion to have at least one character in common, so the only
  change to suggestions is we'll no longer suggest corrections which are
  twice as long or longer even if the edit distance would allow it, which
  seems like an improvement in itself.

* Minor optimisation expanding wildcards.

* PostingIterator::get_description(): For an all-docs iterator on a glass
  database, get_description() would call get_docid() which isn't valid to
  do once the iterator has reached the end.

testsuite:

* Expand allterms test coverage.

matcher:

* Fetch wdf upper bound from postlist which avoids an extra postlist table
  cursor seek per weighted query term, and also means we now use a per-shard
  wdf upper bound for local shards which will in typically give a tighter
  weight upper bound which will tend to make various other matcher
  optimisations more effective.  Eric Wong reported this speeds up a
  particularly slow case from ~2 minutes to ~3 seconds.

  With this change, OP_ELITE_SET can now select a different subset of terms for
  each shard regardless of shard type (previously this only happened for remote
  shards).

* Avoid triggering a pointless maximum weight recalculation if an unweighted
  child of a MultiAndPostList prunes.

* Only check if the database has positional information when the query
  uses positional information.  This should help improve notmuch delete
  performance.  Thanks to andreas on #notmuch for analysis of the problem.

glass backend:

* Optimise Glass::Inverter::has_positions().  Use const auto& instead of just
  auto for the loop variables.  Reported to be faster by andreas on #notmuch.

* Cache result of Glass::Inverter::has_positions() since calculating it is
  potentially very expensive, while maintaining a cached answer is very cheap.

remote backend:

* Add missing closing parenthesis to reported remote prog context, which has
  been missing since this code was first added over 20 years ago!  Spotted by
  Gaurav Arora.

build system:

* Enable compiler option -fno-semantic-interposition if supported.

  This GCC option allows the compiler to optimise essentially assuming
  that functions/variables aren't replaced at dynamic link time.

  Such replacement is not something that it's useful to do for Xapian
  symbols, and we already turn on -Bsymbolic-functions by default which
  prevents such replacement anyway by resolving references within the
  library at build time.

  Reduces the size of the stripped library on x86-64 Debian unstable by
  ~1%, and likely makes it faster too.

* Avoid bogus deprecation warning when compiling with GCC without optimisation.
  In this situation, GCC emits a deprecation warning for code in the definition
  of QueryParser::add_valuerangeprocessor() which is provided for backwards
  API compatibility even if this method is never used anywhere.

  This isn't helpful, especially if the user is using -Werror, so disable the
  -Wdeprecated-deprecations warning for this code.

  Reported by starmad on #xapian.

* Fix GCC -Wmaybe-uninitialized warning.  The warning seems bogus as it's about
  the this pointer being passed to a method which doesn't reference the object,
  but we can just make the method static to avoid the warning, and that's
  arguably cleaner for a method called from the object initialiser list.

* Automatically enable GCC warnings -Wduplicated-cond and -Wduplicated-branches
  if using a GCC version new enough to support them.  The usefulness of
  -Wduplicated-cond was highlighted by dcb in #816.

* Replace uses of obsolete autoconf macros, fixing warnings if configure is
  regenerated with a recent release of autoconf.

* Simplify configure probe for sigsetjmp and siglongjmp.  Just probe
  individually with AC_CHECK_DECLS and then check that both exist with a
  preprocessor check.

* Update XO_LIB_XAPIAN to fix warning that AC_ERROR is obsolete with modern
  autoconf.

* Support linking against static libxapian with cmake. Patch from Anonymous
  Maarten in https://github.com/xapian/xapian/pull/317

* Clean up handling of libs we link libxapian with - previously any libraries
  explicitly specified to configure by the user via LIBS=... as well as -lm
  (if configure determined it was needed) could get added to XAPIAN_LIBS
  multiple times, as well as also getting added to the libxapian link command
  anyway by automake/libtool standard handling.

  Specifying a library more than once on the link line is not a problem on
  common platforms, but may be an issue somewhere (and it's on less common
  platforms where the user is more likely to have to specify LIBS to configure
  and/or where -lm may be needed).

documentation:

* configure: Add missing AC_ARG_VAR for all programs so that they are
  documented in --help output, and so that autoconf knows they are \ 
"precious"
  and preserves them if configure is rerun even when they're specified via an
  environment variable.

* Don't use x^2 to mean x squared in API docs.  This is potentially confusing
  since in C/C++ (and some other languages), ^ means exclusive-or.  Write x²
  instead, which should be clear to all readers.

* Improve docs for Xapian::Stopper and SimpleStopper.

* docs/intro_ir.rst: Fixed an incorrect term index.  Patch from Jaak Ristioja
  in https://github.com/xapian/xapian/pull/321.

* Update for the IRC channel move from freenode to libera.chat.

examples:

* quest: Don't enable spelling correction by default.  It was really only on by
  default because the spelling correction support in quest was added before
  --flags.  It seems more helpful for the default to match the
  Xapian::QueryParser API, and also this fixes the weird situation that
  `--flags default` isn't the default you get without any `--flags` option.

* quest: Multiple `--flags` options now get combined - previously only the last
  was used.

portability:

* Don't automatically use _FORTIFY_SOURCE on mingw-w64.  Recent mingw-w64
  versions require -lssp to be linked when _FORTIFY_SOURCE is enabled, so just
  skip the automatic enabling.  Users who want to enable it can specify it
  explicitly.

  Fixes #808, reported by xpbxf4.

* Workaround NFS issue in test harness function for deleting test databases.
  On NFS, rmdir() can fail with EEXIST or ENOTEMPTY (POSIX allows either)
  due to .nfs* files which are used by NFS clients to implement the Unix
  semantics of a deleted but open file continuing to exist.  We now sleep
  and retry a few times in this situation to give the NFS client a chance
  to process the closing of the open handle.  Problem mentioned in #631.

* configure: Drop -lm special case for Sun C++ as this no longer seems to
  be required.  Tested with Sun C++ 5.13, which is the oldest version we
  now support due to us now requiring C++11.

* Use strerrordesc_np() if available. This is a GNU-specific replacement for
  sys_errlist and sys_nerr.  It was added in glibc 2.32 since which sys_errlist
  and sys_nerr are no longer declared in the headers.

* Update debug logging to use std::uncaught_exceptions() under C++17 and later
  since this allows the debug logging to detect a function without RETURN()
  annotation which exits normally while there's an uncaught exception
  (previously the debug logging would think the stack was being unwound through
  the function).  This also avoids deprecation warnings - the old
  std::uncaught_exception() (note: singular) function was deprecated by
  C++17 and removed in C++20.

* Increase size of buffer passed to strerror_r() from 128 to 1024 bytes, which
  is the size recommended by the man page on Linux.

* Fix -Wdeprecated-copy warning from clang 13.
   2021-10-26 13:23:42 by Nia Alarie | Files touched by this commit (1161)
Log message:
textproc: Replace RMD160 checksums with BLAKE2s checksums

All checksums have been double-checked against existing RMD160 and
SHA512 hashes

Unfetchable distfiles (fetched conditionally?):
./textproc/convertlit/distinfo clit18src.zip
   2021-10-07 17:02:49 by Nia Alarie | Files touched by this commit (1162)
Log message:
textproc: Remove SHA1 hashes for distfiles
   2021-01-14 19:17:10 by Amitai Schleier | Files touched by this commit (4)
Log message:
Update to 1.4.18. From the changelog:

API:

* QueryParser::FLAG_ACCUMULATE: New flag.  Previously the unstem and stoplist
  data was always reset by a call to QueryParser::parse_query(), which makes
  sense if you use the same QueryParser object to parse a series of independent
  queries.  If you're using the same QueryParser object to parse several fields
  on the same query form, you may want to have the unstem and stoplist data
  combined for all of them, in which case you can use this flag to prevent this
  data from being reset.

* QueryParser::unstem_begin(): Eliminate unnecessary copying of the data.

* Fix typo in Swedish stopword list, syncing change made to Snowball by Daniel
  Gómez Villanueva.

* Remove some French stop words with other meanings, syncing change made to
  Snowball by PhilippeOuellet.

testsuite:

* Run testcase testlock4 using backend chert, not just using glass

* Skip testcase testlock4 on platforms that don't allow us to implement
  Database::locked() (which notably include GNU Hurd and Microsoft Windows).

documentation:

* List DB_NO_TERMLIST in the WritableDatabase constructor API documentation
  where we already list the other DB_* constants.

portability:

* Eliminate single use of std::mem_fun() which was deprecated in C++11 and
  removed in C++17.  Reported by Mateusz Pusz in #806.

* Add missing includes for std::numeric_limits<>.  Reported by stac47 in #805.

* Work around mingw.org header issue.  MSVC seems to implicitly include
  <winerror.h> but mingw.org's headers don't, leading to ERROR_PIPE_CONNECTED
  not being defined.  Fixes https://github.com/xapian/xapian/pull/318, reported
  by Alex Sandro.

* Suppress MSVC warnings about possible loss of data.  The values involved are
  the number of set bits in a value of integer type, so these warnings are
  bogus.

* Include <sys/types.h> for size_t and off_t, which is the appropriate header,
  and needed with Android's bionic libc.  Patch from Matthieu Gautier.

* Use a temporary file for the Doxygen configuration to work around Doxygen
  1.8.19 bug which truncates a config file read from stdin to 4096 bytes
  (https://github.com/doxygen/doxygen/issues/7975).

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