What has changed in GDB?
(Organized release by release)
-*** Changes since GDB 7.8
+*** Changes since GDB 7.10
+
+* Support for tracepoints on aarch64-linux was added in GDBserver.
+
+* The 'record instruction-history' command now indicates speculative execution
+ when using the Intel(R) Processor Trace recording format.
+
+* GDB now allows users to specify explicit locations, bypassing
+ the linespec parser. This feature is also available to GDB/MI
+ clients.
+
+* New commands
+
+maint set target-non-stop (on|off|auto)
+maint show target-non-stop
+ Control whether GDB targets always operate in non-stop mode even if
+ "set non-stop" is "off". The default is "auto", meaning non-stop
+ mode is enabled if supported by the target.
+
+*** Changes in GDB 7.10
+
+* 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.
+
+maint set target-non-stop (on|off|auto)
+maint show target-non-stop
+ Control whether GDB targets always operate in non-stop mode even if
+ "set non-stop" is "off". The default is "auto", meaning non-stop
+ mode is enabled if supported by the target.
+
+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.
+
+*** Changes in GDB 7.9.1
+
+* Python Scripting
+
+ ** Xmethods can now specify a result type.
+
+*** Changes in GDB 7.9
* GDB now supports hardware watchpoints on x86 GNU Hurd.
* New commands
+demangle [-l language] [--] name
+ Demangle "name" in the specified language, or the current language
+ if elided. This command is renamed from the "maint demangle" command.
+ The latter is kept as a no-op to avoid "maint demangle" being interpreted
+ as "maint demangler-warning".
+
queue-signal signal-name-or-number
Queue a signal to be delivered to the thread when it is resumed.
** The -list-thread-groups command outputs an exit-code field for
inferiors that have exited.
+* New targets
+
+MIPS SDE mips*-sde*-elf*
+
* Removed targets
Support for these obsolete configurations has been removed.
VAX running (4.2 - 4.3 Reno) BSD vax-*-bsd*
VAX running Ultrix vax-*-ultrix*
+* The "dll-symbols" command, and its two aliases ("add-shared-symbol-files"
+ and "assf"), have been removed. Use the "sharedlibrary" command, or
+ its alias "share", instead.
+
*** Changes in GDB 7.8
* New command line options
projects / deliverable / binutils-gdb.git / blobdiff