What has changed in GDB?
(Organized release by release)
-*** Changes since GDB 8.2
+*** Changes since GDB 8.3
+
+*** Changes in GDB 8.3
+
+* GDB and GDBserver now support access to additional registers on
+ PowerPC GNU/Linux targets: PPR, DSCR, TAR, EBB/PMU registers, and
+ HTM registers.
* GDB now has experimental support for the compilation and injection of
C++ source code into the inferior. This beta release does not include
* DWARF index cache: GDB can now automatically save indices of DWARF
symbols on disk to speed up further loading of the same binaries.
+* Ada task switching is now supported on aarch64-elf targets when
+ debugging a program using the Ravenscar Profile. For more information,
+ see the "Tasking Support when using the Ravenscar Profile" section
+ in the GDB user manual.
+
* GDB in batch mode now exits with status 1 if the last command to be
executed failed.
-* Changes to the "frame", "select-frame", and "info frame" CLI
- commands. These commands all now take a frame specification which
- is either a frame level, or one of the keywords 'level', 'address',
- 'function', or 'view' followed by a parameter. Selecting a frame by
- address, or viewing a frame outside the current backtrace now
- requires the use of a keyword. Selecting a frame by level is
- unchanged. The MI comment "-stack-select-frame" is unchanged.
+* The RISC-V target now supports target descriptions.
+
+* System call catchpoints now support system call aliases on FreeBSD.
+ When the ABI of a system call changes in FreeBSD, this is
+ implemented by leaving a compatibility system call using the old ABI
+ at the existing number and allocating a new system call number for
+ the new ABI. For example, FreeBSD 12 altered the layout of 'struct
+ kevent' used by the 'kevent' system call. As a result, FreeBSD 12
+ kernels ship with both 'kevent' and 'freebsd11_kevent' system calls.
+ The 'freebsd11_kevent' system call is assigned an alias of 'kevent'
+ so that a system call catchpoint for the 'kevent' system call will
+ catch invocations of both the 'kevent' and 'freebsd11_kevent'
+ binaries. This ensures that 'kevent' system calls are caught for
+ binaries using either the old or new ABIs.
+
+* Terminal styling is now available for the CLI and the TUI. GNU
+ Source Highlight can additionally be used to provide styling of
+ source code snippets. See the "set style" commands, below, for more
+ information.
+
+* Removed support for old demangling styles arm, edg, gnu, hp and
+ lucid.
* New commands
* Changed commands
+Changes to the "frame", "select-frame", and "info frame" CLI commands.
+ These commands all now take a frame specification which
+ is either a frame level, or one of the keywords 'level', 'address',
+ 'function', or 'view' followed by a parameter. Selecting a frame by
+ address, or viewing a frame outside the current backtrace now
+ requires the use of a keyword. Selecting a frame by level is
+ unchanged. The MI comment "-stack-select-frame" is unchanged.
+
target remote FILENAME
target extended-remote FILENAME
If FILENAME is a Unix domain socket, GDB will attempt to connect
to this socket instead of opening FILENAME as a character device.
+info args [-q] [-t TYPEREGEXP] [NAMEREGEXP]
+info functions [-q] [-t TYPEREGEXP] [NAMEREGEXP]
+info locals [-q] [-t TYPEREGEXP] [NAMEREGEXP]
+info variables [-q] [-t TYPEREGEXP] [NAMEREGEXP]
+ These commands can now print only the searched entities
+ matching the provided regexp(s), giving a condition
+ on the entity names or entity types. The flag -q disables
+ printing headers or informations messages.
+
+info functions
+info types
+info variables
+rbreak
+ These commands now determine the syntax for the shown entities
+ according to the language chosen by `set language'. In particular,
+ `set language auto' means to automatically choose the language of
+ the shown entities.
+
thread apply [all | COUNT | -COUNT] [FLAG]... COMMAND
The 'thread apply' command accepts new FLAG arguments.
FLAG arguments allow to control what output to produce and how to handle
errors raised when applying COMMAND to a thread.
+set tui tab-width NCHARS
+show tui tab-width NCHARS
+ "set tui tab-width" replaces the "tabset" command, which has been deprecated.
+
+set style enabled [on|off]
+show style enabled
+ Enable or disable terminal styling. Styling is enabled by default
+ on most hosts, but disabled by default when in batch mode.
+
+set style filename foreground COLOR
+set style filename background COLOR
+set style filename intensity VALUE
+ Control the styling of file names.
+
+set style function foreground COLOR
+set style function background COLOR
+set style function intensity VALUE
+ Control the styling of function names.
+
+set style variable foreground COLOR
+set style variable background COLOR
+set style variable intensity VALUE
+ Control the styling of variable names.
+
+set style address foreground COLOR
+set style address background COLOR
+set style address intensity VALUE
+ Control the styling of addresses.
+
* 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*
+FreeBSD/riscv riscv*-*-freebsd*
* New targets
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
+ ** GDB no longer supports Python versions less than 2.6.
+
** The gdb.Inferior type has a new 'progspace' property, which is the program
space associated to that inferior.
** The gdb.Progspace type has a new 'objfiles' method, which returns the list
of objfiles associated to that program space.
+ ** gdb.SYMBOL_LOC_COMMON_BLOCK, gdb.SYMBOL_MODULE_DOMAIN, and
+ gdb.SYMBOL_COMMON_BLOCK_DOMAIN were added to reflect changes to
+ the gdb core.
+
+ ** gdb.SYMBOL_VARIABLES_DOMAIN, gdb.SYMBOL_FUNCTIONS_DOMAIN, and
+ gdb.SYMBOL_TYPES_DOMAIN are now deprecated. These were never
+ correct and did not work properly.
+
+ ** The gdb.Value type has a new constructor, which is used to construct a
+ gdb.Value from a Python buffer object and a gdb.Type.
+
* Configure changes
--enable-ubsan
- Enable or disable the undefined behavior sanitizer. Release
- versions of GDB disable this by default if it is available, but
- development versions enable it. Enabling this can cause a
- performance penalty. The undefined behavior sanitizer was first
- introduced in GCC 4.9.
+ Enable or disable the undefined behavior sanitizer. This is
+ disabled by default, but passing --enable-ubsan=yes or
+ --enable-ubsan=auto to configure will enable it. Enabling this can
+ cause a performance penalty. The undefined behavior sanitizer was
+ first introduced in GCC 4.9.
*** Changes in GDB 8.2