Annotations start with a newline character, two ‘
characters, and the name of the annotation. If there is no additional
information associated with this annotation, the name of the annotation
is followed immediately by a newline. If there is additional
information, the name of the annotation is followed by a space, the
additional information, and a newline. The additional information
cannot contain newline characters.
Any output not beginning with a newline and two ‘
characters denotes literal output from GDB. Currently there is
no need for GDB to output a newline followed by two
control-z’ characters, but if there was such a need, the
annotations could be extended with an ‘
escape’ annotation which
means those three characters as output.
level, which is specified using the
--annotate command line option (see Mode Options), controls
how much information GDB prints together with its prompt,
values of expressions, source lines, and other types of output. Level 0
is for no annotations, level 1 is for use when GDB is run as a
subprocess of GNU Emacs, level 3 is the maximum annotation suitable
for programs that control GDB, and level 2 annotations have
been made obsolete (see [[../../annotate/Limitations#Limitations|Limitations of the Annotation
Interface]] in GDB’s Obsolete Annotations).
set annotate level
The GDB command
set annotate sets the level of
annotations to the specified
Show the current annotation level.
This chapter describes level 3 annotations.
A simple example of starting up GDB with annotations is:
$ gdb --annotate=3 GNU gdb 6.0 Copyright 2003 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-pc-linux-gnu" ^Z^Zpre-prompt (gdb) ^Z^Zprompt quit ^Z^Zpost-prompt $
quit’ is input to GDB; the rest is output from
GDB. The three lines beginning ‘
^Z^Z’ (where ‘
denotes a ‘
control-z’ character) are annotations; the rest is
output from GDB.