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NEWS
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What has changed in GDB?
(Organized release by release)
*** 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.
* Multi-architecture debugging is supported on AArch64 GNU/Linux.
GDB now is able to debug both AArch64 applications and ARM applications
at the same time.
* 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.
maint set bfd-sharing
maint show bfd-sharing
Control the reuse of bfd objects.
set debug bfd-cache
show debug bfd-cache
Control display of debugging info regarding bfd caching.
set remote multiprocess-extensions-packet
show remote multiprocess-extensions-packet
Set/show the use of the remote protocol multiprocess extensions.
* The "disassemble" command accepts a new modifier: /s.
It prints mixed source+disassembly like /m with two differences:
- disassembled instructions are now printed in program order, and
- and source for all relevant files is now printed.
The "/m" option is now considered deprecated: its "source-centric"
output hasn't proved useful in practice.
* Support for various ROM monitors has been removed:
target dbug dBUG ROM monitor for Motorola ColdFire
target picobug Motorola picobug monitor
target dink32 DINK32 ROM monitor for PowerPC
target m32r Renesas M32R/D ROM monitor
target mon2000 mon2000 ROM monitor
target ppcbug PPCBUG ROM monitor for PowerPC
* Support for reading/writing memory and extracting values on architectures
whose memory is addressable in units of any integral multiple of 8 bits.
* New remote packets
exec stop reason
Indicates that an exec system call was executed.
exec-events feature in qSupported
The qSupported packet allows GDB to request support for exec
events using the new 'gdbfeature' exec-event, and the qSupported
response can contain the corresponding 'stubfeature'. Set and
show commands can be used to display whether these features are enabled.
* Extended-remote exec events
** GDB now has support for exec events on extended-remote Linux targets.
For such targets with Linux kernels 2.5.46 and later, this enables
follow-exec-mode and exec catchpoints.
set remote exec-event-feature-packet
show remote exec-event-feature-packet
Set/show the use of the remote exec event feature.
*** 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.
* Python Scripting
** You can now access frame registers from Python scripts.
** New attribute 'producer' for gdb.Symtab objects.
** gdb.Objfile objects have a new attribute "progspace",
which is the gdb.Progspace object of the containing program space.
** gdb.Objfile objects have a new attribute "owner".
** gdb.Objfile objects have a new attribute "build_id",
which is the build ID generated when the file was built.
** gdb.Objfile objects have a new method "add_separate_debug_file".
** A new event "gdb.clear_objfiles" has been added, triggered when
selecting a new file to debug.
** You can now add attributes to gdb.Objfile and gdb.Progspace objects.
** New function gdb.lookup_objfile.
New events which are triggered when GDB modifies the state of the
inferior.
** gdb.events.inferior_call_pre: Function call is about to be made.
** gdb.events.inferior_call_post: Function call has just been made.
** gdb.events.memory_changed: A memory location has been altered.
** gdb.events.register_changed: A register has been altered.
* New Python-based convenience functions:
** $_caller_is(name [, number_of_frames])
** $_caller_matches(regexp [, number_of_frames])
** $_any_caller_is(name [, number_of_frames])
** $_any_caller_matches(regexp [, number_of_frames])
* GDB now supports the compilation and injection of source code into
the inferior. GDB will use GCC 5.0 or higher built with libcc1.so
to compile the source code to object code, and if successful, inject
and execute that code within the current context of the inferior.
Currently the C language is supported. The commands used to
interface with this new feature are:
compile code [-raw|-r] [--] [source code]
compile file [-raw|-r] filename
* 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.
add-auto-load-scripts-directory directory
Add entries to the list of directories from which to load auto-loaded
scripts.
maint print user-registers
List all currently available "user" registers.
compile code [-r|-raw] [--] [source code]
Compile, inject, and execute in the inferior the executable object
code produced by compiling the provided source code.
compile file [-r|-raw] filename
Compile and inject into the inferior the executable object code
produced by compiling the source code stored in the filename
provided.
* On resume, GDB now always passes the signal the program had stopped
for to the thread the signal was sent to, even if the user changed
threads before resuming. Previously GDB would often (but not
always) deliver the signal to the thread that happens to be current
at resume time.
* Conversely, the "signal" command now consistently delivers the
requested signal to the current thread. GDB now asks for
confirmation if the program had stopped for a signal and the user
switched threads meanwhile.
* "breakpoint always-inserted" modes "off" and "auto" merged.
Now, when 'breakpoint always-inserted mode' is set to "off", GDB
won't remove breakpoints from the target until all threads stop,
even in non-stop mode. The "auto" mode has been removed, and "off"
is now the default mode.
* New options
set debug symbol-lookup
show debug symbol-lookup
Control display of debugging info regarding symbol lookup.
* MI changes
** 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.
Alpha running OSF/1 (or Tru64) alpha*-*-osf*
SGI Irix-5.x mips-*-irix5*
SGI Irix-6.x mips-*-irix6*
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
-D data-directory
This is an alias for the --data-directory option.
* GDB supports printing and modifying of variable length automatic arrays
as specified in ISO C99.
* The ARM simulator now supports instruction level tracing
with or without disassembly.
* Guile scripting
GDB now has support for scripting using Guile. Whether this is
available is determined at configure time.
Guile version 2.0 or greater is required.
Guile version 2.0.9 is well tested, earlier 2.0 versions are not.
* New commands (for set/show, see "New options" below)
guile [code]
gu [code]
Invoke CODE by passing it to the Guile interpreter.
guile-repl
gr
Start a Guile interactive prompt (or "repl" for "read-eval-print loop").
info auto-load guile-scripts [regexp]
Print the list of automatically loaded Guile scripts.
* The source command is now capable of sourcing Guile scripts.
This feature is dependent on the debugger being built with Guile support.
* New options
set print symbol-loading (off|brief|full)
show print symbol-loading
Control whether to print informational messages when loading symbol
information for a file. The default is "full", but when debugging
programs with large numbers of shared libraries the amount of output
becomes less useful.
set guile print-stack (none|message|full)
show guile print-stack
Show a stack trace when an error is encountered in a Guile script.
set auto-load guile-scripts (on|off)
show auto-load guile-scripts
Control auto-loading of Guile script files.
maint ada set ignore-descriptive-types (on|off)
maint ada show ignore-descriptive-types
Control whether the debugger should ignore descriptive types in Ada
programs. The default is not to ignore the descriptive types. See
the user manual for more details on descriptive types and the intended
usage of this option.
set auto-connect-native-target
Control whether GDB is allowed to automatically connect to the
native target for the run, attach, etc. commands when not connected
to any target yet. See also "target native" below.
set record btrace replay-memory-access (read-only|read-write)
show record btrace replay-memory-access
Control what memory accesses are allowed during replay.
maint set target-async (on|off)
maint show target-async
This controls whether GDB targets operate in synchronous or
asynchronous mode. Normally the default is asynchronous, if it is
available; but this can be changed to more easily debug problems
occurring only in synchronous mode.
set mi-async (on|off)
show mi-async
Control whether MI asynchronous mode is preferred. This supersedes
"set target-async" of previous GDB versions.
* "set target-async" is deprecated as a CLI option and is now an alias
for "set mi-async" (only puts MI into async mode).
* Background execution commands (e.g., "c&", "s&", etc.) are now
possible ``out of the box'' if the target supports them. Previously
the user would need to explicitly enable the possibility with the
"set target-async on" command.
* New features in the GDB remote stub, GDBserver
** New option --debug-format=option1[,option2,...] allows one to add
additional text to each output. At present only timestamps
are supported: --debug-format=timestamps.
Timestamps can also be turned on with the
"monitor set debug-format timestamps" command from GDB.
* The 'record instruction-history' command now starts counting instructions
at one. This also affects the instruction ranges reported by the
'record function-call-history' command when given the /i modifier.
* The command 'record function-call-history' supports a new modifier '/c' to
indent the function names based on their call stack depth.
The fields for the '/i' and '/l' modifier have been reordered.
The source line range is now prefixed with 'at'.
The instruction range is now prefixed with 'inst'.
Both ranges are now printed as '<from>, <to>' to allow copy&paste to the
"record instruction-history" and "list" commands.
* The ranges given as arguments to the 'record function-call-history' and
'record instruction-history' commands are now inclusive.
* The btrace record target now supports the 'record goto' command.
For locations inside the execution trace, the back trace is computed
based on the information stored in the execution trace.
* The btrace record target supports limited reverse execution and replay.
The target does not record data and therefore does not allow reading
memory or registers.
* The "catch syscall" command now works on s390*-linux* targets.
* The "compare-sections" command is no longer specific to target
remote. It now works with all targets.
* All native targets are now consistently called "native".
Consequently, the "target child", "target GNU", "target djgpp",
"target procfs" (Solaris/Irix/OSF/AIX) and "target darwin-child"
commands have been replaced with "target native". The QNX/NTO port
leaves the "procfs" target in place and adds a "native" target for
consistency with other ports. The impact on users should be minimal
as these commands previously either throwed an error, or were
no-ops. The target's name is visible in the output of the following
commands: "help target", "info target", "info files", "maint print
target-stack".
* The "target native" command now connects to the native target. This
can be used to launch native programs even when "set
auto-connect-native-target" is set to off.
* GDB now supports access to Intel(R) MPX registers on GNU/Linux.
* Support for Intel(R) AVX-512 registers on GNU/Linux.
Support displaying and modifying Intel(R) AVX-512 registers
$zmm0 - $zmm31 and $k0 - $k7 on GNU/Linux.
* New remote packets
qXfer:btrace:read's annex
The qXfer:btrace:read packet supports a new annex 'delta' to read
branch trace incrementally.
* Python Scripting
** Valid Python operations on gdb.Value objects representing
structs/classes invoke the corresponding overloaded operators if
available.
** New `Xmethods' feature in the Python API. Xmethods are
additional methods or replacements for existing methods of a C++
class. This feature is useful for those cases where a method
defined in C++ source code could be inlined or optimized out by
the compiler, making it unavailable to GDB.
* New targets
PowerPC64 GNU/Linux little-endian powerpc64le-*-linux*
* The "dll-symbols" command, and its two aliases ("add-shared-symbol-files"
and "assf"), have been deprecated. Use the "sharedlibrary" command, or
its alias "share", instead.
* The commands "set remotebaud" and "show remotebaud" are no longer
supported. Use "set serial baud" and "show serial baud" (respectively)
instead.
* MI changes
** A new option "-gdb-set mi-async" replaces "-gdb-set
target-async". The latter is left as a deprecated alias of the
former for backward compatibility. If the target supports it,
CLI background execution commands are now always possible by
default, independently of whether the frontend stated a
preference for asynchronous execution with "-gdb-set mi-async".
Previously "-gdb-set target-async off" affected both MI execution
commands and CLI execution commands.
*** Changes in GDB 7.7
* Improved support for process record-replay and reverse debugging on
arm*-linux* targets. Support for thumb32 and syscall instruction
recording has been added.
* GDB now supports SystemTap SDT probes on AArch64 GNU/Linux.
* GDB now supports Fission DWP file format version 2.
http://gcc.gnu.org/wiki/DebugFission
* New convenience function "$_isvoid", to check whether an expression
is void. A void expression is an expression where the type of the
result is "void". For example, some convenience variables may be
"void" when evaluated (e.g., "$_exitcode" before the execution of
the program being debugged; or an undefined convenience variable).
Another example, when calling a function whose return type is
"void".
* The "maintenance print objfiles" command now takes an optional regexp.
* The "catch syscall" command now works on arm*-linux* targets.
* GDB now consistently shows "<not saved>" when printing values of
registers the debug info indicates have not been saved in the frame
and there's nowhere to retrieve them from
(callee-saved/call-clobbered registers):
(gdb) p $rax
$1 = <not saved>
(gdb) info registers rax
rax <not saved>
Before, the former would print "<optimized out>", and the latter
"*value not available*".
* New script contrib/gdb-add-index.sh for adding .gdb_index sections
to binaries.
* Python scripting
** Frame filters and frame decorators have been added.
** Temporary breakpoints are now supported.
** Line tables representation has been added.
** New attribute 'parent_type' for gdb.Field objects.
** gdb.Field objects can be used as subscripts on gdb.Value objects.
** New attribute 'name' for gdb.Type objects.
* New targets
Nios II ELF nios2*-*-elf
Nios II GNU/Linux nios2*-*-linux
Texas Instruments MSP430 msp430*-*-elf
* Removed native configurations
Support for these a.out NetBSD and OpenBSD obsolete configurations has
been removed. ELF variants of these configurations are kept supported.
arm*-*-netbsd* but arm*-*-netbsdelf* is kept supported.
i[34567]86-*-netbsd* but i[34567]86-*-netbsdelf* is kept supported.
i[34567]86-*-openbsd[0-2].* but i[34567]86-*-openbsd* is kept supported.
i[34567]86-*-openbsd3.[0-3]
m68*-*-netbsd* but m68*-*-netbsdelf* is kept supported.
sparc-*-netbsd* but sparc-*-netbsdelf* is kept supported.
vax-*-netbsd* but vax-*-netbsdelf* is kept supported.
* New commands:
catch rethrow
Like "catch throw", but catches a re-thrown exception.
maint check-psymtabs
Renamed from old "maint check-symtabs".
maint check-symtabs
Perform consistency checks on symtabs.
maint expand-symtabs
Expand symtabs matching an optional regexp.
show configuration
Display the details of GDB configure-time options.
maint set|show per-command
maint set|show per-command space
maint set|show per-command time
maint set|show per-command symtab
Enable display of per-command gdb resource usage.
remove-symbol-file FILENAME
remove-symbol-file -a ADDRESS
Remove a symbol file added via add-symbol-file. The file to remove
can be identified by its filename or by an address that lies within
the boundaries of this symbol file in memory.
info exceptions
info exceptions REGEXP
Display the list of Ada exceptions defined in the program being
debugged. If provided, only the exceptions whose names match REGEXP
are listed.
* New options
set debug symfile off|on
show debug symfile
Control display of debugging info regarding reading symbol files and
symbol tables within those files
set print raw frame-arguments
show print raw frame-arguments
Set/show whether to print frame arguments in raw mode,
disregarding any defined pretty-printers.
set remote trace-status-packet
show remote trace-status-packet
Set/show the use of remote protocol qTStatus packet.
set debug nios2
show debug nios2
Control display of debugging messages related to Nios II targets.
set range-stepping
show range-stepping
Control whether target-assisted range stepping is enabled.
set startup-with-shell
show startup-with-shell
Specifies whether Unix child processes are started via a shell or
directly.
set code-cache
show code-cache
Use the target memory cache for accesses to the code segment. This
improves performance of remote debugging (particularly disassembly).
* You can now use a literal value 'unlimited' for options that
interpret 0 or -1 as meaning "unlimited". E.g., "set
trace-buffer-size unlimited" is now an alias for "set
trace-buffer-size -1" and "set height unlimited" is now an alias for
"set height 0".
* The "set debug symtab-create" debugging option of GDB has been changed to
accept a verbosity level. 0 means "off", 1 provides basic debugging
output, and values of 2 or greater provides more verbose output.
* New command-line options
--configuration
Display the details of GDB configure-time options.
* The command 'tsave' can now support new option '-ctf' to save trace
buffer in Common Trace Format.
* Newly installed $prefix/bin/gcore acts as a shell interface for the
GDB command gcore.
* GDB now implements the the C++ 'typeid' operator.
* The new convenience variable $_exception holds the exception being
thrown or caught at an exception-related catchpoint.
* The exception-related catchpoints, like "catch throw", now accept a
regular expression which can be used to filter exceptions by type.
* The new convenience variable $_exitsignal is automatically set to
the terminating signal number when the program being debugged dies
due to an uncaught signal.
* MI changes
** All MI commands now accept an optional "--language" option.
Support for this feature can be verified by using the "-list-features"
command, which should contain "language-option".
** The new command -info-gdb-mi-command allows the user to determine
whether a GDB/MI command is supported or not.
** The "^error" result record returned when trying to execute an undefined
GDB/MI command now provides a variable named "code" whose content is the
"undefined-command" error code. Support for this feature can be verified
by using the "-list-features" command, which should contain
"undefined-command-error-code".
** The -trace-save MI command can optionally save trace buffer in Common
Trace Format now.
** The new command -dprintf-insert sets a dynamic printf breakpoint.
** The command -data-list-register-values now accepts an optional
"--skip-unavailable" option. When used, only the available registers
are displayed.
** The new command -trace-frame-collected dumps collected variables,
computed expressions, tvars, memory and registers in a traceframe.
** The commands -stack-list-locals, -stack-list-arguments and
-stack-list-variables now accept an option "--skip-unavailable".
When used, only the available locals or arguments are displayed.
** The -exec-run command now accepts an optional "--start" option.
When used, the command follows the same semantics as the "start"
command, stopping the program's execution at the start of its
main subprogram. Support for this feature can be verified using
the "-list-features" command, which should contain
"exec-run-start-option".
** The new commands -catch-assert and -catch-exceptions insert
catchpoints stopping the program when Ada exceptions are raised.
** The new command -info-ada-exceptions provides the equivalent of
the new "info exceptions" command.
* New system-wide configuration scripts
A GDB installation now provides scripts suitable for use as system-wide
configuration scripts for the following systems:
** ElinOS
** Wind River Linux
* GDB now supports target-assigned range stepping with remote targets.
This improves the performance of stepping source lines by reducing
the number of control packets from/to GDB. See "New remote packets"
below.
* GDB now understands the element 'tvar' in the XML traceframe info.
It has the id of the collected trace state variables.
* On S/390 targets that provide the transactional-execution feature,
the program interruption transaction diagnostic block (TDB) is now
represented as a number of additional "registers" in GDB.
* New remote packets
vCont;r
The vCont packet supports a new 'r' action, that tells the remote
stub to step through an address range itself, without GDB
involvemement at each single-step.
qXfer:libraries-svr4:read's annex
The previously unused annex of the qXfer:libraries-svr4:read packet
is now used to support passing an argument list. The remote stub
reports support for this argument list to GDB's qSupported query.
The defined arguments are "start" and "prev", used to reduce work
necessary for library list updating, resulting in significant
speedup.
* New features in the GDB remote stub, GDBserver
** GDBserver now supports target-assisted range stepping. Currently
enabled on x86/x86_64 GNU/Linux targets.
** GDBserver now adds element 'tvar' in the XML in the reply to
'qXfer:traceframe-info:read'. It has the id of the collected
trace state variables.
** GDBserver now supports hardware watchpoints on the MIPS GNU/Linux
target.
* New 'z' formatter for printing and examining memory, this displays the
value as hexadecimal zero padded on the left to the size of the type.
* GDB can now use Windows x64 unwinding data.
* The "set remotebaud" command has been replaced by "set serial baud".
Similarly, "show remotebaud" has been replaced by "show serial baud".
The "set remotebaud" and "show remotebaud" commands are still available
to provide backward compatibility with older versions of GDB.
*** Changes in GDB 7.6
* Target record has been renamed to record-full.
Record/replay is now enabled with the "record full" command.
This also affects settings that are associated with full record/replay
that have been moved from "set/show record" to "set/show record full":
set|show record full insn-number-max
set|show record full stop-at-limit
set|show record full memory-query
* A new record target "record-btrace" has been added. The new target
uses hardware support to record the control-flow of a process. It
does not support replaying the execution, but it implements the
below new commands for investigating the recorded execution log.
This new recording method can be enabled using:
record btrace
The "record-btrace" target is only available on Intel Atom processors
and requires a Linux kernel 2.6.32 or later.
* Two new commands have been added for record/replay to give information
about the recorded execution without having to replay the execution.
The commands are only supported by "record btrace".
record instruction-history prints the execution history at
instruction granularity
record function-call-history prints the execution history at
function granularity
* New native configurations
ARM AArch64 GNU/Linux aarch64*-*-linux-gnu
FreeBSD/powerpc powerpc*-*-freebsd
x86_64/Cygwin x86_64-*-cygwin*
Tilera TILE-Gx GNU/Linux tilegx*-*-linux-gnu
* New targets
ARM AArch64 aarch64*-*-elf
ARM AArch64 GNU/Linux aarch64*-*-linux
Lynx 178 PowerPC powerpc-*-lynx*178
x86_64/Cygwin x86_64-*-cygwin*
Tilera TILE-Gx GNU/Linux tilegx*-*-linux
* If the configured location of system.gdbinit file (as given by the
--with-system-gdbinit option at configure time) is in the