- update to 2.15:
  * Mikael Simberg and Tom "spot" Callaway have pointed out the
    missing symbols issue when linking PPC or i386
    builds.
  * Roman Geissler has contributed a fix to nasty initialization
    bug introduced in 2.13 (see github issue #1452 for one example
    where it fails).
  * spinlock delay support now has proper windows support.
    Instead of simply sleeping, it uses WaitOnAddress (which is
    basically windows equivalent of futexes). This improvement was
    contributed by Lennox Ho.
  * we now have basic QNX support (basic malloc + heap profiler)
    championed by Xiang.Lin. Thanks! Do note, however, that QNX
    doesn't provide SIGPROF ticks, so there will be no cpu profiler
    support on this OS.
  * several people have contributed various improvements to our
    cmake build: Lennox Ho, Sergey Fedorov, Mateusz Jakub Fila. But
    do note that cmake build is still incomplete and best-effort.
  * Julian Schroeder have fixed generic_fp incompatibility with
    ARM pointer auth.
  * Mateusz Jakub Fila has contributed implementation of
    mallocinfo2 function (64-bit version of mallinfo).
  * Lennox Ho has contributed the ability to disable malloc
    functions patching on windows when TCMALLOC_DISABLE_REPLACEMENT=1
    environment variable is set.
  * User poljak181 has contributed a fix to infinite recursion in
    some cases of malloc hooks (or user-replaced operator new) and
    MallocExtension::instance().
  * Sergey Fedorov has contributed a fix to use MAP_ANON on some
    older OSes without MAP_ANONYMOUS.

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- gperftools 2.5, available 12 March 2016.
  See https://github.com/gperftools/gperftools/releases
  * Bryan Chan has contributed s390x support
  * stacktrace capturing via libgcc's _Unwind_Backtrace was implemented
    (for architectures with missing or broken libunwind).
  * "emergency malloc" was implemented. Which unbreaks recursive calls
    to malloc/free from stacktrace capturing functions (such us glib'c
    backtrace() or libunwind on arm). It is enabled by
    --enable-emergency-malloc configure flag or by default on arm when
    --enable-stacktrace-via-backtrace is given. It is another fix for a
    number common issues people had on platforms with missing or broken
    libunwind.
  * C++14 sized-deallocation is now supported (on gcc 5 and recent
    clangs). It is off by default and can be enabled at configure time
    via --enable-sized-delete. On GNU/Linux it can also be enabled at
    run-time by either TCMALLOC_ENABLE_SIZED_DELETE environment variable
    or by defining tcmalloc_sized_delete_enabled function which should
    return 1 to enable it.
  * we've lowered default value of transfer batch size to 512. Previous
    value (bumped up in 2.1) was too high and caused performance
    regression for some users. 512 should still give us performance
    boost for workloads that need higher transfer batch size while not
    penalizing other workloads too much.
  * Brian Silverman's patch finally stopped arming profiling timer
    unless profiling is started.
  * Andrew Morrow has contributed support for obtaining cache size of the
    current thread and softer idling (for use in MongoDB).
  * we've implemented few minor performance improvements, particularly
    on malloc fast-path.
  * issue that caused spurious profiler_unittest.sh failures was fixed.

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