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[Launchpad Bug Tracker <1631339@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package mysql-5.7 - 5.7.17-0ubuntu0.16.04.2

---------------
mysql-5.7 (5.7.17-0ubuntu0.16.04.2) xenial; urgency=medium

  * Add libjson-perl dependency for test suite (LP: #1631338)
    The last two python tests in the mtr suite were rewritten
    in perl, and require this package. Added for mysql-testsuite
    and as a build-dep.
  * Build with DWITH_LZ4=system (LP: #1631339)
    Package was previously built with bundled liblz4, though it
    was specified as a build-dep.
  * Add support for custom datadir to systemd service (LP: #1574782)
    The service was reporting an error if no database could be found in
    /var/lib/mysql. It now checks the location specified in the config.
    Note that user must still handle apparmor access for custom datadir.
  * Fix copy of soft-link datadir to /var/lib/mysql-upgrade (LP: #1474212)
    Upgrade would sometimes fail if mysql-upgrade already contained a
    link copy from a previous upgrade.
  * Escape special characters in password (LP: #1598992)
    Special characters in the root password would cause syntax errors
    and postinst failures.
  * Failing tests on platforms supported by upstream fail build (LP: #1646488)
    A passing test suite is now enforced on i386 and amd64 platforms at
    build-time.
  * d/copyright: Updated with information about new source files
  * Unstable test main.xa_prepared_binlog_off disabled pending upstream fix.
    Upstream bug report: http://bugs.mysql.com/bug.php?id=83340
  * d/lintian-overrides: Updated line numbers

 -- Lars Tangvald <lars.tangvald@xxxxxxxxxx>  Fri, 03 Feb 2017 08:53:04
+0100

** Changed in: mysql-5.7 (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** Bug watch added: MySQL Bug System #83340
   http://bugs.mysql.com/bug.php?id=83340

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https://bugs.launchpad.net/bugs/1631339

Title:
  Build with lz4 build-dep instead of bundled

Status in mysql-5.7 package in Ubuntu:
  Fix Released
Status in mysql-5.7 source package in Xenial:
  Fix Released

Bug description:
  MySQL 5.7 source package has liblz4-dev as a build-dep, but it isn't
  actually used because the build defaults to using a bundled version.

  [Impact]
  No known user impact at present (other than a small difference in binary footprint), but builds shouldn't use bundled libraries when it's available in the system.

  [racb] However a future security update in liblz4-dev will not update
  MySQL. We fixed this in sid, and I think it's appropriate to backport
  given that we've tested it in Yakkety.

  Add cmake flag -DWITH_LZ4=system to use the correct version.

  [Test case]
  * Build package
  * Run ldd on usr/lib/lz4_decompress and see it doesn't link in liblz4 from the system.

  [Regression potential]
  This change has been in Yakkety for some time (5.7.15-0ubuntu2).

  Database dump-related utils like mysqlpump and lz4_decompress could be
  impacted if any significant changes arise between the version of
  liblz4 available on user systems and what is used to test upstream.

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