*** Changes since GDB 8.3
+* 'thread-exited' event is now available in the annotations interface.
+
+* New built-in convenience variables $_gdb_major and $_gdb_minor
+ provide the GDB version. They are handy for conditionally using
+ features available only in or since specific GDB versions, in
+ scripts that should work error-free with many different versions,
+ such as in system-wide init files.
+
+* GDB now supports Thread Local Storage (TLS) variables on several
+ FreeBSD architectures (amd64, i386, powerpc, riscv). Other
+ architectures require kernel changes. TLS is not yet supported for
+ amd64 and i386 process core dumps.
+
+* Support for Pointer Authentication on AArch64 Linux.
+
+* Two new convenience functions $_cimag and $_creal that extract the
+ imaginary and real parts respectively from complex numbers.
+
+* New built-in convenience variables $_shell_exitcode and $_shell_exitsignal
+ provide the exitcode or exit status of the shell commands launched by
+ GDB commands such as "shell", "pipe" and "make".
+
+* Python API
+
+ ** The gdb.Value type has a new method 'format_string' which returns a
+ string representing the value. The formatting is controlled by the
+ optional keyword arguments: 'raw', 'pretty_arrays', 'pretty_structs',
+ 'array_indexes', 'symbols', 'unions', 'deref_refs', 'actual_objects',
+ 'static_members', 'max_elements', 'repeat_threshold', and 'format'.
+
+ ** gdb.Type has a new property 'objfile' which returns the objfile the
+ type was defined in.
+
+ ** The frame information printed by the python frame filtering code
+ is now consistent with what the 'backtrace' command prints when
+ there are no filters, or when the 'backtrace' '-no-filters' option
+ is given.
+
+ ** gdb.Objfile has new methods 'lookup_global_symbol' and
+ 'lookup_static_symbol' to lookup a symbol from this objfile only.
+
+* New commands
+
+| [COMMAND] | SHELL_COMMAND
+| -d DELIM COMMAND DELIM SHELL_COMMAND
+pipe [COMMAND] | SHELL_COMMAND
+pipe -d DELIM COMMAND DELIM SHELL_COMMAND
+ Executes COMMAND and sends its output to SHELL_COMMAND.
+ With no COMMAND, repeat the last executed command
+ and send its output to SHELL_COMMAND.
+
+with SETTING [VALUE] [-- COMMAND]
+w SETTING [VALUE] [-- COMMAND]
+ Temporarily set SETTING, run COMMAND, and restore SETTING.
+ Usage: with SETTING -- COMMAND
+ With no COMMAND, repeats the last executed command.
+ SETTING is any GDB setting you can change with the "set"
+ subcommands. For example, 'with language c -- print someobj'
+ temporarily switches to the C language in order to print someobj.
+ Settings can be combined: 'w lang c -- w print elements unlimited --
+ usercmd' switches to the C language and runs usercmd with no limit
+ of array elements to print.
+
+maint with SETTING [VALUE] [-- COMMAND]
+ Like "with", but works with "maintenance set" settings.
+
+set may-call-functions [on|off]
+show may-call-functions
+ This controls whether GDB will attempt to call functions in
+ the program, such as with expressions in the print command. It
+ defaults to on. Calling functions in the program being debugged
+ can have undesired side effects. It is now possible to forbid
+ such function calls. If function calls are forbidden, GDB will throw
+ an error when a command (such as print expression) calls a function
+ in the program.
+
+set print finish [on|off]
+show print finish
+ This controls whether the `finish' command will display the value
+ that is returned by the current function. When `off', the value is
+ still entered into the value history, but it is not printed. The
+ default is `on'.
+
+set print max-depth
+show print max-depth
+ Allows deeply nested structures to be simplified when printing by
+ replacing deeply nested parts (beyond the max-depth) with ellipses.
+ The default max-depth is 20, but this can be set to unlimited to get
+ the old behavior back.
+
+set logging debugredirect [on|off]
+ By default, GDB debug output will go to both the terminal and the logfile.
+ Set if you want debug output to go only to the log file.
+
+set style title foreground COLOR
+set style title background COLOR
+set style title intensity VALUE
+ Control the styling of titles.
+
+set style highlight foreground COLOR
+set style highlight background COLOR
+set style highlight intensity VALUE
+ Control the styling of highlightings.
+
+maint set test-settings KIND
+maint show test-settings KIND
+ A set of commands used by the testsuite for exercising the settings
+ infrastructure.
+
+set print frame-info [short-location|location|location-and-address
+ |source-and-location|source-line|auto]
+show print frame-info
+ This controls what frame information is printed by the commands printing
+ a frame. This setting will e.g. influence the behaviour of 'backtrace',
+ 'frame', 'stepi'. The python frame filtering also respect this setting.
+ The 'backtrace' '-frame-info' option can override this global setting.
+
+* Changed commands
+
+help
+ The "help" command uses the title style to enhance the
+ readibility of its output by styling the classes and
+ command names.
+
+apropos [-v] REGEXP
+ Similarly to "help", the "apropos" command also uses the
+ title style for the command names. "apropos" accepts now
+ a flag "-v" (verbose) to show the full documentation
+ of matching commands and to use the highlight style to mark
+ the documentation parts matching REGEXP.
+
+printf
+eval
+ The GDB printf and eval commands can now print C-style and Ada-style
+ string convenience variables without calling functions in the program.
+ This allows to do formatted printing of strings without having
+ a running inferior, or when debugging a core dump.
+
+show style
+ The "show style" and its subcommands are now styling
+ a style name in their output using its own style, to help
+ the user visualize the different styles.
+
+set print frame-arguments
+ The new value 'presence' indicates to only indicate the presence of
+ arguments using ..., instead of printing argument names and values.
+
+set print raw-frame-arguments
+show print raw-frame-arguments
+
+ These commands replace the similarly-named "set/show print raw
+ frame-arguments" commands (now with a dash instead of a space). The
+ old commands are now deprecated and may be removed in a future
+ release.
+
+maint test-options require-delimiter
+maint test-options unknown-is-error
+maint test-options unknown-is-operand
+maint show test-options-completion-result
+ Commands used by the testsuite to validate the command options
+ framework.
+
+* New command options, command completion
+
+ GDB now has a standard infrastructure to support dash-style command
+ options ('-OPT'). One benefit is that commands that use it can
+ easily support completion of command line arguments. Try "CMD
+ -[TAB]" or "help CMD" to find options supported by a command. Over
+ time, we intend to migrate most commands to this infrastructure. A
+ number of commands got support for new command options in this
+ release:
+
+ ** The "print" and "compile print" commands now support a number of
+ options that allow overriding relevant global print settings as
+ set by "set print" subcommands:
+
+ -address [on|off]
+ -array [on|off]
+ -array-indexes [on|off]
+ -elements NUMBER|unlimited
+ -null-stop [on|off]
+ -object [on|off]
+ -pretty [on|off]
+ -repeats NUMBER|unlimited
+ -static-members [on|off]
+ -symbol [on|off]
+ -union [on|off]
+ -vtbl [on|off]
+
+ Note that because the "print"/"compile print" commands accept
+ arbitrary expressions which may look like options (including
+ abbreviations), if you specify any command option, then you must
+ use a double dash ("--") to mark the end of argument processing.
+
+ ** The "backtrace" command now supports a number of options that
+ allow overriding relevant global print settings as set by "set
+ backtrace" and "set print" subcommands:
+
+ -entry-values no|only|preferred|if-needed|both|compact|default
+ -frame-arguments all|scalars|none
+ -raw-frame-arguments [on|off]
+ -frame-info auto|source-line|location|source-and-location
+ |location-and-address|short-location
+ -past-main [on|off]
+ -past-entry [on|off]
+
+ In addition, the full/no-filters/hide qualifiers are now also
+ exposed as command options too:
+
+ -full
+ -no-filters
+ -hide
+
+ ** The "frame apply", "tfaas" and "faas" commands similarly now
+ support the following options:
+
+ -past-main [on|off]
+ -past-entry [on|off]
+
+ All options above can also be abbreviated. The argument of boolean
+ (on/off) options can be 0/1 too, and also the argument is assumed
+ "on" if omitted. This allows writing compact command invocations,
+ like for example:
+
+ (gdb) p -r -p -o 0 -- *myptr
+
+ The above is equivalent to:
+
+ (gdb) print -raw -pretty -object off -- *myptr
+
+ ** The "info types" command now supports the '-q' flag to disable
+ printing of some header information in a similar fashion to "info
+ variables" and "info functions".
+
+* Completion improvements
+
+ ** GDB can now complete the options of the "thread apply all" and
+ "taas" commands, and their "-ascending" option can now be
+ abbreviated.
+
+ ** GDB can now complete the options of the "info threads", "info
+ functions", "info variables", "info locals", and "info args"
+ commands.
+
+ ** GDB can now complete the options of the "compile file" and
+ "compile code" commands. The "compile file" command now
+ completes on filenames.
+
+ ** GDB can now complete the backtrace command's
+ "full/no-filters/hide" qualifiers.
+
+* In settings, you can now abbreviate "unlimited".
+
+ E.g., "set print elements u" is now equivalent to "set print
+ elements unlimited".
+
+* New MI commands
+
+-complete
+ This lists all the possible completions for the rest of the line, if it
+ were to be given as a command itself. This is intended for use by MI
+ frontends in cases when separate CLI and MI channels cannot be used.
+
+-catch-throw, -catch-rethrow, and -catch-catch
+ These can be used to catch C++ exceptions in a similar fashion to
+ the CLI commands 'catch throw', 'catch rethrow', and 'catch catch'.
+
+* Testsuite
+
+ The testsuite now creates the files gdb.cmd (containing the arguments
+ used to launch GDB) and gdb.in (containing all the commands sent to
+ GDB) in the output directory for each test script. Multiple invocations
+ are appended with .1, .2, .3 etc.
+
*** Changes in GDB 8.3
* GDB and GDBserver now support access to additional registers on
* Removed support for old demangling styles arm, edg, gnu, hp and
lucid.
-* New targets
-
- NXP S12Z s12z-*-elf
- GNU/Linux/OpenRISC or1k*-*-linux*
-
* New commands
set debug compile-cplus-types
Enable or disable terminal styling. Styling is enabled by default
on most hosts, but disabled by default when in batch mode.
+set style sources [on|off]
+show style sources
+ Enable or disable source code styling. Source code styling is
+ enabled by default, but only takes effect if styling in general is
+ enabled, and if GDB was linked with GNU Source Highlight.
+
set style filename foreground COLOR
set style filename background COLOR
set style filename intensity VALUE
* MI changes
+ ** The default version of the MI interpreter is now 3 (-i=mi3).
+
** The '-data-disassemble' MI command now accepts an '-a' option to
disassemble the whole function surrounding the given program
counter value or function name. Support for this feature can be
** Command responses and notifications that include a frame now include
the frame's architecture in a new "arch" attribute.
+ ** The output of information about multi-location breakpoints (which is
+ syntactically incorrect in MI 2) has changed in MI 3. This affects
+ the following commands and events:
+
+ - -break-insert
+ - -break-info
+ - =breakpoint-created
+ - =breakpoint-modified
+
+ The -fix-multi-location-breakpoint-output command can be used to enable
+ this behavior with previous MI versions.
+
* New native configurations
GNU/Linux/RISC-V riscv*-*-linux*
CSKY ELF csky*-*-elf
CSKY GNU/LINUX csky*-*-linux
FreeBSD/riscv riscv*-*-freebsd*
+NXP S12Z s12z-*-elf
+GNU/Linux/OpenRISC or1k*-*-linux*
+
+* Removed targets
+
+GDB no longer supports native debugging on versions of MS-Windows
+before Windows XP.
* Python API