API:
* Add XAPIAN_AT_LEAST(A,B,C) macro.
* MSet::snippet(): Optimise snippet generation - it's now ~46% faster in a
simple test.
* Add Xapian::DOC_ASSUME_VALID flag which tells Database::get_document() that
it doesn't need to check that the passed docid is valid. Fixes#739,
reported by Germán M. Bravo.
* TfIdfWeight: Add support for the L wdf normalisation. Patch from Vivek Pal.
* BB2Weight: Fix weights when database has just one document. Our existing
attempt to clamp N to be at least 2 was ineffective due to computing
N - 2 < 0 in an unsigned type.
* DPHWeight: Fix reversed sign in quadratic formula, making the upper bound a
tiny amount higher.
* DLHWeight: Correct upper bound which was a bit too low, due to flawed logic
in its derivation. The new bound is slightly less tight (by a few percent).
* DLHWeight,DPHWeight: Avoid calculating log(0) when wdf is equal to the
document length.
* TermGenerator: Handle stemmer returning empty string - the Arabic stemmer
can currently do this (e.g. for a single tatweel) and user stemmers can too.
Fixes#741, reported by Emmanuel Engelhart.
* Database::check(): Fix check that the first docid in each doclength chunk is
more than the last docid in the previous chunk - this code was in the wrong
place so didn't actually work.
* Database::get_unique_terms(): Clamp returned value to be <= document length.
Ideally get_unique_terms() ought to only count terms with wdf > 0, but that's
expensive to calculate on demand.
glass backend:
* When compacting we now only write the iamglass file out once, and we write it
before we sync the tables but sync it after, which is more I/O friendly.
* Database::check(): Fix in SEGV when out == NULL and opts != 0.
* Fix potential SEGV with corrupt value stats.
chert backend:
* Fix potential SEGV with corrupt value stats.
build system:
* Add XO_REQUIRE autoconf macro to provide an easy way to handle version checks
in user configure scripts.
tools:
* quest: Support BM25+, LM and PL2+ weighting schemes.
* xapian-check: Fix when ellipses are shown in 't' mode. They were being shown
when there were exactly 6 entries, but we only start omitting entries when
there are *more* than 6. Fix applies to both glass and chert.
portability:
* Avoid using opendir()/readdir() in our closefrom() implementation as these
functions can call malloc(), which isn't safe to do between fork() and exec()
in a multi-threaded program, but after fork() is exactly where we want to
use closefrom(). Instead we now use getdirentries() on Linux and
getdirentriesattr() on OS X (OS X support bugs shaken out with help from
Germán M. Bravo).
* Support reading UUIDs from /proc/sys/kernel/random/uuid which is especially
useful when building for Android, as it avoids having to cross-build a UUID
library.
* Disable volatile workaround for excess precision SEGV for SSE - previously it
was only being disabled for SSE2.
* When building for x86 using a compiler where we don't know how to disable
use of 387 FP instructions, we now run remote servers for the testsuite under
valgrind --tool=none, like we do when --disable-sse is explicitly specified.
* Add alignment_cast<T> which has the same effect as reinterpret_cast<T> but
avoids warnings about alignment issues.
* Suppress warnings about unused private members. DLHWeight and DPHWeight
have an unused lower_bound member, which clang warns about, but we need to
keep them there in 1.4.x to preserve ABI compatibility.
* Remove workaround for g++ 2.95 bug as we require at least 4.7 now.
* configure: Probe for <cxxabi.h>. GCC added this header in GCC 3.1, which
is much older than we support, so we've just assumed it was available if
__GNUC__ was defined. However, clang lies and defines __GNUC__ yet doesn't
seem to reliably provide <cxxabi.h>, so we need to probe for it.
* Fix "unused assignment" warning.
* configure: Probe for __builtin_* functions. Previously we just checked for
__GNUC__ being defined, but it's cleaner to probe for them properly -
compilers other than GCC and those that pretend to be GCC might provide these
too.
* Use __builtin_clz() with compilers which support it to speed up encoding
and especially decoding of positional data. This speed up phrase searching
by ~0.5% in a simple test.
* Check signed right shift behaviour at compile time - we can use a test on a
constant expression which should optimise away to just the required version
of the code, which means that on platforms which perform sign-extension
(pretty much everything current it seems) we don't have to rely on the
compiler optimising a portable idiom down to the appropriate right shift
instruction.
* Improve configure check for log2(). We include <cmath> so the check really
should succeed if only std::log2() is declared.
* Enable win32-dll option to LT_INIT.
debug code:
* xapian-inspect:
+ Support glass instead of chert.
+ Allow control of showing keys/tags.
+ Use more mnemonic letters than X for command arguments in help.
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