*** Changes since GDB 7.9

* Support for process record-replay and reverse debugging on aarch64*-linux*
  targets has been added.  GDB now supports recording of A64 instruction set
  including advance SIMD instructions.

* Support for Sun's version of the "stabs" debug file format has been removed.

* GDB now honors the content of the file /proc/PID/coredump_filter
  (PID is the process ID) on GNU/Linux systems.  This file can be used
  to specify the types of memory mappings that will be included in a
  corefile.  For more information, please refer to the manual page of
  "core(5)".  GDB also has a new command: "set use-coredump-filter
  on|off".  It allows to set whether GDB will read the content of the
  /proc/PID/coredump_filter file when generating a corefile.

* The "info os" command on GNU/Linux can now display information on
  cpu information :
    "info os cpus" Listing of all cpus/cores on the system

* GDB has two new commands: "set serial parity odd|even|none" and
  "show serial parity".  These allows to set or show parity for the
  remote serial I/O.

* The "info source" command now displays the producer string if it was
  present in the debug info.  This typically includes the compiler version
  and may include things like its command line arguments.

* The "info dll", an alias of the "info sharedlibrary" command,
  is now available on all platforms.

* Directory names supplied to the "set sysroot" commands may be
  prefixed with "target:" to tell GDB to access shared libraries from
  the target system, be it local or remote.  This replaces the prefix
  "remote:".  The default sysroot has been changed from "" to
  "target:".  "remote:" is automatically converted to "target:" for
  backward compatibility.

* The system root specified by "set sysroot" will be prepended to the
  filename of the main executable (if reported to GDB as absolute by
  the operating system) when starting processes remotely, and when
  attaching to already-running local or remote processes.

* GDB now supports automatic location and retrieval of executable
  files from remote targets.  Remote debugging can now be initiated
  using only a "target remote" or "target extended-remote" command
  (no "set sysroot" or "file" commands are required).  See "New remote
  packets" below.

* The "dump" command now supports verilog hex format.

* GDB now supports the vector ABI on S/390 GNU/Linux targets.

* On GNU/Linux, GDB and gdbserver are now able to access executable
  and shared library files without a "set sysroot" command when
  attaching to processes running in different mount namespaces from
  the debugger.  This makes it possible to attach to processes in
  containers as simply as "gdb -p PID" or "gdbserver --attach PID".
  See "New remote packets" below.

* The "tui reg" command now provides completion for all of the
  available register groups, including target specific groups.

* The HISTSIZE environment variable is no longer read when determining
  the size of GDB's command history.  GDB now instead reads the dedicated
  GDBHISTSIZE environment variable.  Setting GDBHISTSIZE to "-1" or to "" now
  disables truncation of command history.  Non-numeric values of GDBHISTSIZE
  are ignored.

* Guile Scripting

  ** Memory ports can now be unbuffered.

* Python Scripting

  ** gdb.Objfile objects have a new attribute "username",
     which is the name of the objfile as specified by the user,
     without, for example, resolving symlinks.
  ** You can now write frame unwinders in Python.
  ** gdb.Type objects have a new method "optimized_out",
     returning optimized out gdb.Value instance of this type.
  ** gdb.Value objects have new methods "reference_value" and
     "const_value" which return a reference to the value and a
     "const" version of the value respectively.

* New commands

maint print symbol-cache
  Print the contents of the symbol cache.

maint print symbol-cache-statistics
  Print statistics of symbol cache usage.

maint flush-symbol-cache
  Flush the contents of the symbol cache.

record btrace bts
record bts
  Start branch trace recording using Branch Trace Store (BTS) format.

compile print
  Evaluate expression by using the compiler and print result.

tui enable
tui disable
  Explicit commands for enabling and disabling tui mode.

show mpx bound
set mpx bound on i386 and amd64
   Support for bound table investigation on Intel(R) MPX enabled applications.

record btrace pt
record pt
  Start branch trace recording using Intel(R) Processor Trace format.

maint info btrace
  Print information about branch tracing internals.

maint btrace packet-history
  Print the raw branch tracing data.

maint btrace clear-packet-history
  Discard the stored raw branch tracing data.

maint btrace clear
  Discard all branch tracing data.  It will be fetched and processed
  anew by the next "record" command.

* New options

set debug dwarf-die
  Renamed from "set debug dwarf2-die".
show debug dwarf-die
  Renamed from "show debug dwarf2-die".

set debug dwarf-read
  Renamed from "set debug dwarf2-read".
show debug dwarf-read
  Renamed from "show debug dwarf2-read".

maint set dwarf always-disassemble
  Renamed from "maint set dwarf2 always-disassemble".
maint show dwarf always-disassemble
  Renamed from "maint show dwarf2 always-disassemble".

maint set dwarf max-cache-age
  Renamed from "maint set dwarf2 max-cache-age".
maint show dwarf max-cache-age
  Renamed from "maint show dwarf2 max-cache-age".

set debug dwarf-line
show debug dwarf-line
  Control display of debugging info regarding DWARF line processing.

set max-completions
show max-completions
  Set the maximum number of candidates to be considered during
  completion.  The default value is 200.  This limit allows GDB
  to avoid generating large completion lists, the computation of
  which can cause the debugger to become temporarily unresponsive.

set history remove-duplicates
show history remove-duplicates
  Control the removal of duplicate history entries.

maint set symbol-cache-size
maint show symbol-cache-size
  Control the size of the symbol cache.

set|show record btrace bts buffer-size
  Set and show the size of the ring buffer used for branch tracing in
  BTS format.
  The obtained size may differ from the requested size.  Use "info
  record" to see the obtained buffer size.

set debug linux-namespaces
show debug linux-namespaces
  Control display of debugging info regarding Linux namespaces.

set|show record btrace pt buffer-size
  Set and show the size of the ring buffer used for branch tracing in
  Intel(R) Processor Trace format.
  The obtained size may differ from the requested size.  Use "info
  record" to see the obtained buffer size.

maint set|show btrace pt skip-pad
  Set and show whether PAD packets are skipped when computing the
  packet history.

* The command 'thread apply all' can now support new option '-ascending'
  to call its specified command for all threads in ascending order.

* Python/Guile scripting

  ** GDB now supports auto-loading of Python/Guile scripts contained in the
     special section named `.debug_gdb_scripts'.

* New remote packets

qXfer:btrace-conf:read
  Return the branch trace configuration for the current thread.

Qbtrace-conf:bts:size
  Set the requested ring buffer size for branch tracing in BTS format.

Qbtrace:pt
  Enable Intel(R) Procesor Trace-based branch tracing for the current
  process.  The remote stub reports support for this packet to GDB's
  qSupported query.

Qbtrace-conf:pt:size
  Set the requested ring buffer size for branch tracing in Intel(R) Processor
  Trace format.

swbreak stop reason
  Indicates a memory breakpoint instruction was executed, irrespective
  of whether it was GDB that planted the breakpoint or the breakpoint
  is hardcoded in the program.  This is required for correct non-stop
  mode operation.

hwbreak stop reason
  Indicates the target stopped for a hardware breakpoint.  This is
  required for correct non-stop mode operation.

vFile:fstat:
  Return information about files on the remote system.

qXfer:exec-file:read
  Return the full absolute name of the file that was executed to
  create a process running on the remote system.

vFile:setfs:
  Select the filesystem on which vFile: operations with filename
  arguments will operate.  This is required for GDB to be able to
  access files on remote targets where the remote stub does not
  share a common filesystem with the inferior(s).

fork stop reason
  Indicates that a fork system call was executed.

vfork stop reason
  Indicates that a vfork system call was executed.

vforkdone stop reason
  Indicates that a vfork child of the specified process has executed
  an exec or exit, allowing the vfork parent to resume execution.

fork-events and vfork-events features in qSupported
  The qSupported packet allows GDB to request support for fork and 
  vfork events using new 'gdbfeatures' fork-events and vfork-events,
  and the qSupported response can contain the corresponding
  'stubfeatures'.  Set and show commands can be used to display
  whether these features are enabled.

* Extended-remote fork events

  ** GDB now has support for fork events on extended-remote Linux
     targets.  For targets with Linux kernels 2.5.60 and later, this
     enables follow-fork-mode and detach-on-fork for both fork and
     vfork, as well as fork and vfork catchpoints.

* The info record command now shows the recording format and the
  branch tracing configuration for the current thread when using
  the btrace record target.
  For the BTS format, it shows the ring buffer size.

* GDB now has support for DTrace USDT (Userland Static Defined
  Tracing) probes.  The supported targets are x86_64-*-linux-gnu.

* GDB now supports access to vector registers on S/390 GNU/Linux
  targets.

* Removed command line options

-xdb  HP-UX XDB compatibility mode.

* Removed targets and native configurations

HP/PA running HP-UX           hppa*-*-hpux*
Itanium running HP-UX         ia64-*-hpux*

* New configure options

--with-intel-pt
  This configure option allows the user to build GDB with support for
  Intel(R) Processor Trace (default: auto).  This requires libipt.

--with-libipt-prefix=PATH
  Specify the path to the version of libipt that GDB should use.
  $PATH/include should contain the intel-pt.h header and
  $PATH/lib should contain the libipt.so library.