[Bug 1922048] [NEW] FFe: new upstream version 2.9.1

[Matthias Klose]

Public bug reported:

2.9.1 adds mainly better architecture support.

== 2 March 2021 ==
gperftools 2.9.1 is out!

Minor fixes landed since previous release:

* OSX builds new prefer backtrace() and have somewhat working heap
  sampling.

* Incorrect assertion failure was fixed that crashed tcmalloc if
  assertions were on and sized delete was used. More details in github
  issue #1254.

== 21 February 2021 ==
gperftools 2.9 is out!

Few more changes landed compared to rc:

* Venkatesh Srinivas has contributed thread-safety annotations
  support.

* couple more unit test bugs that caused tcmalloc_unittest to fail on
  recent clang has been fixed.

* usage of unsupportable linux_syscall_support.h has been removed from
  few places. Building with --disable-heap-checker now completely
  avoids it. Expect complete death of this header in next major
  release.

== 14 February 2021 ==
gperftools 2.9rc is out!

Here are notable changes:

* Jarno Rajahalme has contributed fix for crashing bug in syscalls
  support for aarch64.

* User SSE4 has contributed basic support for Elbrus 2000 architecture
  (!)

* Venkatesh Srinivas has contributed cleanup to atomic ops.

* Đoàn Trần Công Danh has fixed cpu profiler compilation on musl.

* there is now better backtracing support for aarch64 and
  riscv. x86-64 with frame pointers now also defaults to this new
  "generic" frame pointer backtracer.

* emergency malloc is now enabled by default. Fixes hang on musl when
  libgcc backtracer is enabled.

* bunch of legacy config tests has been removed

** Affects: google-perftools (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1922048

Title:
  FFe: new upstream version 2.9.1

Status in google-perftools package in Ubuntu:
  New

Bug description:
  2.9.1 adds mainly better architecture support.

  == 2 March 2021 ==
  gperftools 2.9.1 is out!

  Minor fixes landed since previous release:

  * OSX builds new prefer backtrace() and have somewhat working heap
    sampling.

  * Incorrect assertion failure was fixed that crashed tcmalloc if
    assertions were on and sized delete was used. More details in github
    issue #1254.

  == 21 February 2021 ==
  gperftools 2.9 is out!

  Few more changes landed compared to rc:

  * Venkatesh Srinivas has contributed thread-safety annotations
    support.

  * couple more unit test bugs that caused tcmalloc_unittest to fail on
    recent clang has been fixed.

  * usage of unsupportable linux_syscall_support.h has been removed from
    few places. Building with --disable-heap-checker now completely
    avoids it. Expect complete death of this header in next major
    release.

  == 14 February 2021 ==
  gperftools 2.9rc is out!

  Here are notable changes:

  * Jarno Rajahalme has contributed fix for crashing bug in syscalls
    support for aarch64.

  * User SSE4 has contributed basic support for Elbrus 2000 architecture
    (!)

  * Venkatesh Srinivas has contributed cleanup to atomic ops.

  * Đoàn Trần Công Danh has fixed cpu profiler compilation on musl.

  * there is now better backtracing support for aarch64 and
    riscv. x86-64 with frame pointers now also defaults to this new
    "generic" frame pointer backtracer.

  * emergency malloc is now enabled by default. Fixes hang on musl when
    libgcc backtracer is enabled.

  * bunch of legacy config tests has been removed

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