### 22.10 Optional Messages about Internal Happenings

GDB has commands that enable optional debugging messages from various GDB subsystems; normally these commands are of interest to GDB maintainers, or when reporting a bug. This section documents those commands.

`set exec-done-display`

  Turns on or off the notification of asynchronous commands’ completion. When on, GDB will print a message when an asynchronous command finishes its execution. The default is off.

`show exec-done-display`

  Displays the current setting of asynchronous command completion notification.

`set debug aarch64`

  Turns on or off display of debugging messages related to ARM AArch64. The default is off.

`show debug aarch64`

  Displays the current state of displaying debugging messages related to ARM AArch64.

`set debug arch`

  Turns on or off display of gdbarch debugging info. The default is off

`show debug arch`

  Displays the current state of displaying gdbarch debugging info.

`set debug aix-solib`

  Control display of debugging messages from the AIX shared library support module. The default is off.

`show debug aix-thread`

  Show the current state of displaying AIX shared library debugging messages.

`set debug aix-thread`

  Display debugging messages about inner workings of the AIX thread module.

`show debug aix-thread`

  Show the current state of AIX thread debugging info display.

`set debug check-physname`

  Check the results of the “physname” computation. When reading DWARF debugging information for C`++`, GDB attempts to compute each entity’s name. GDB can do this computation in two different ways, depending on exactly what information is present. When enabled, this setting causes GDB to compute the names both ways and display any discrepancies.

`show debug check-physname`

  Show the current state of “physname” checking.

`set debug coff-pe-read`

  Control display of debugging messages related to reading of COFF/PE exported symbols. The default is off.

`show debug coff-pe-read`

  Displays the current state of displaying debugging messages related to reading of COFF/PE exported symbols.

`set debug dwarf-die`

  Dump DWARF DIEs after they are read in. The value is the number of nesting levels to print. A value of zero turns off the display.

`show debug dwarf-die`

  Show the current state of DWARF DIE debugging.

`set debug dwarf-line`

  Turns on or off display of debugging messages related to reading DWARF line tables. The default is 0 (off). A value of 1 provides basic information. A value greater than 1 provides more verbose information.

`show debug dwarf-line`

  Show the current state of DWARF line table debugging.

`set debug dwarf-read`

  Turns on or off display of debugging messages related to reading DWARF debug info. The default is 0 (off). A value of 1 provides basic information. A value greater than 1 provides more verbose information.

`show debug dwarf-read`

  Show the current state of DWARF reader debugging.

`set debug displaced`

  Turns on or off display of GDB debugging info for the displaced stepping support. The default is off.

`show debug displaced`

  Displays the current state of displaying GDB debugging info related to displaced stepping.

`set debug event`

  Turns on or off display of GDB event debugging info. The default is off.

`show debug event`

  Displays the current state of displaying GDB event debugging info.

`set debug expression`

  Turns on or off display of debugging info about GDB expression parsing. The default is off.

`show debug expression`

  Displays the current state of displaying debugging info about GDB expression parsing.

`set debug fbsd-lwp`

  Turns on or off debugging messages from the FreeBSD LWP debug support.

`show debug fbsd-lwp`

  Show the current state of FreeBSD LWP debugging messages.

`set debug fbsd-nat`

  Turns on or off debugging messages from the FreeBSD native target.

`show debug fbsd-nat`

  Show the current state of FreeBSD native target debugging messages.

`set debug frame`

  Turns on or off display of GDB frame debugging info. The default is off.

`show debug frame`

  Displays the current state of displaying GDB frame debugging info.

`set debug gnu-nat`

  Turn on or off debugging messages from the GNU/Hurd debug support.

`show debug gnu-nat`

  Show the current state of GNU/Hurd debugging messages.

`set debug infrun`

  Turns on or off display of GDB debugging info for running the inferior. The default is off. `infrun.c` contains GDB’s runtime state machine used for implementing operations such as single-stepping the inferior.

`show debug infrun`

  Displays the current state of GDB inferior debugging.

`set debug jit`

  Turn on or off debugging messages from JIT debug support.

`show debug jit`

  Displays the current state of GDB JIT debugging.

`set debug lin-lwp`

  Turn on or off debugging messages from the Linux LWP debug support.

`show debug lin-lwp`

  Show the current state of Linux LWP debugging messages.

`set debug linux-namespaces`

  Turn on or off debugging messages from the Linux namespaces debug support.

`show debug linux-namespaces`

  Show the current state of Linux namespaces debugging messages.

`set debug mach-o`

  Control display of debugging messages related to Mach-O symbols processing. The default is off.

`show debug mach-o`

  Displays the current state of displaying debugging messages related to reading of COFF/PE exported symbols.

`set debug notification`

  Turn on or off debugging messages about remote async notification. The default is off.

`show debug notification`

  Displays the current state of remote async notification debugging messages.

`set debug observer`

  Turns on or off display of GDB observer debugging. This includes info such as the notification of observable events.

`show debug observer`

  Displays the current state of observer debugging.

`set debug overload`

  Turns on or off display of GDB C`++` overload debugging info. This includes info such as ranking of functions, etc. The default is off.

`show debug overload`

  Displays the current state of displaying GDB C`++` overload debugging info.

`set debug parser`

  Turns on or off the display of expression parser debugging output. Internally, this sets the `yydebug` variable in the expression parser. See Tracing Your Parser in Bison, for details. The default is off.

`show debug parser`

  Show the current state of expression parser debugging.

`set debug remote`

  Turns on or off display of reports on all packets sent back and forth across the serial line to the remote machine. The info is printed on the GDB standard output stream. The default is off.

`show debug remote`

  Displays the state of display of remote packets.

`set debug remote-packet-max-chars`

  Sets the maximum number of characters to display for each remote packet when `set debug remote` is on. This is useful to prevent GDB from displaying lengthy remote packets and polluting the console.

  The default value is `512`, which means GDB will truncate each remote packet after 512 bytes.

  Setting this option to `unlimited` will disable truncation and will output the full length of the remote packets.

`show debug remote-packet-max-chars`

  Displays the number of bytes to output for remote packet debugging.

`set debug separate-debug-file`

  Turns on or off display of debug output about separate debug file search.

`show debug separate-debug-file`

  Displays the state of separate debug file search debug output.

`set debug serial`

  Turns on or off display of GDB serial debugging info. The default is off.

`show debug serial`

  Displays the current state of displaying GDB serial debugging info.

`set debug solib-frv`

  Turn on or off debugging messages for FR-V shared-library code.

`show debug solib-frv`

  Display the current state of FR-V shared-library code debugging messages.

`set debug symbol-lookup`

  Turns on or off display of debugging messages related to symbol lookup. The default is 0 (off). A value of 1 provides basic information. A value greater than 1 provides more verbose information.

`show debug symbol-lookup`

  Show the current state of symbol lookup debugging messages.

`set debug symfile`

  Turns on or off display of debugging messages related to symbol file functions. The default is off. See Files.

`show debug symfile`

  Show the current state of symbol file debugging messages.

`set debug symtab-create`

  Turns on or off display of debugging messages related to symbol table creation. The default is 0 (off). A value of 1 provides basic information. A value greater than 1 provides more verbose information.

`show debug symtab-create`

  Show the current state of symbol table creation debugging.

`set debug target`

  Turns on or off display of GDB target debugging info. This info includes what is going on at the target level of GDB, as it happens. The default is 0. Set it to 1 to track events, and to 2 to also track the value of large memory transfers.

`show debug target`

  Displays the current state of displaying GDB target debugging info.

`set debug timestamp`

  Turns on or off display of timestamps with GDB debugging info. When enabled, seconds and microseconds are displayed before each debugging message.

`show debug timestamp`

  Displays the current state of displaying timestamps with GDB debugging info.

`set debug varobj`

  Turns on or off display of GDB variable object debugging info. The default is off.

`show debug varobj`

  Displays the current state of displaying GDB variable object debugging info.

`set debug xml`

  Turn on or off debugging messages for built-in XML parsers.

`show debug xml`

  Displays the current state of XML debugging messages.