tukaani-project/xz v5.7.1alpha

XZ Utils 5.7.1alpha (unstable)

on GitHub

5.7.1alpha (2025-01-23)

   * All fixes from 5.6.4.

   * liblzma:

       - Improve LZMA/LZMA2 encoder speed on 64-bit PowerPC (both
         endiannesses) and those 64-bit RISC-V processors that
         support fast unaligned access.

       - x86/x86-64/E2K CLMUL CRC code was rewritten. It's faster and
         doesn't cause false positives from sanitizers. Attributes
         like __attribute__((__no_sanitize_address__)) are no longer
         present.

       - On 32-bit x86, CLMUL CRC and the old (but still good)
         assembly versions now co-exist with runtime detection.
         Both Autotools and CMake build systems handle this
         automatically now.

       - Use the CRC32 instructions on LoongArch to make CRC32
         calculation faster.

       - Add low-level APIs for RISC-V, ARM64, and x86 BCJ filters
         to lzma/bcj.h. These are primarily for erofs-utils.

       - Minor tweaks to ARM64 CRC32 code and BCJ filters were made.

   * xz:

       - Synchronize the output file and its directory before deleting
         the input file using fsync(). This reduces the probability of
         data loss after a system crash. However, it can be a major
         performance hit if processing many small files.

         NOTE: No syncing is done when xz isn't going to delete
         the input file.

       - Add a new option --no-sync to disable the sync-before-delete
         behavior. It's useful when compressing many small files and
         one doesn't worry about data loss in case of a system crash.

       - Make --single-stream imply --keep.

       - Use automatic word wrapping for the text in --help and
         similar situations to hopefully make the strings easier for
         majority of translators (no need to count spaces anymore).

   * xz, xzdec, lzmainfo: When printing messages, replace
     non-printable characters with question marks. This way
     malicious filenames cannot be used to send escape sequences
     to a terminal. This change is also applied to filenames shown
     in "xz --robot --list".

   * xz and xzdec on Linux: Add support for Landlock ABI versions 5
     and 6.

   * CMake updates:

       - Increase the minimum required CMake version to 3.20.

       - Revise the configuration variables and some of their options.
         Document them in the file INSTALL.

       - Attempt to produce liblzma.pc so that the paths are based on
         ${prefix}, which makes it simpler to override the paths
         if the liblzma files have been moved.

       - To enable translations, gettext-tools is now required. The
         CMake build no longer supports installing pre-compiled
         message catalog binary files (po/*.gmo).

       - Apple: Use Mach-O shared library versioning that is
         compatible with GNU Libtool. This should make it easier to
         switch between the build systems on Apple OSes that enforce
         the correct compatibility_version (macOS >= 12 doesn't?).
         This change is backward compatible: binaries linked against
         old CMake-built liblzma will run with liblzma that uses
         Libtool style versioning.

       - Windows (not Cygwin): Document CMAKE_DLL_NAME_WITH_SOVERSION
         (CMake >= 3.27) in the file INSTALL. This option should
         usually be left to its default value (OFF). It can be set
         to ON if the liblzma DLL filename must be compatible with
         the versioned filename produced by GNU Libtool. For example,
         binaries distributed in MSYS2 use a versioned DLL filename.

       - CMake support is no longer experimental. (It was already
         not experimental when building for native Windows.)

   * Windows: Building liblzma with Visual Studio 2013 is no longer
     supported. Visual Studio 2015 or later (with CMake) can be used
     to build liblzma and the command line tools.

   * Add preliminary Georgian translation. This already contains
     translations of most of the strings that are now automatically
     word wrapped.

   * Add build-aux/license-check.sh. Without arguments, it checks that
     no license information has been forgotten. With the -v argument,
     it shows the license info (or the lack of it) for each file.

     If the .git directory is available, only the files in the
     repository are checked. Without the .git directory, a clean tree
     from an extracted release tarball is expected.