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Specifying source directories
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Specifying source directories
Executable programs sometimes do not record the directories of the source
files from which they were compiled, just the names. Even when they do, the
directories could be moved between the compilation and your debugging session. GDB has
a list of directories to search for source files; this is called the source path. Each time GDB wants a source file, it tries all the directories in the list,
in the order they are present in the list, until it finds a file with the
desired name.
Note:
The executable search path is not used for this purpose. Neither is the current working directory, unless it
happens to be in the source path.
If GDB cannot find a source file in the source path, and the object program
records a directory, GDB tries that directory too. If the source path is empty,
and there is no record of the compilation directory, GDB looks in the current
directory as a last resort.
Whenever you reset or rearrange the source path, GDB clears out any
information it has cached about where source files are found and where each line is in
the file. When you start GDB, its source path is empty. To add other directories,
use the
directory command.
directory dirname ...
dir dirname ...
Add directory, dirname, to the front of the source path. Several directory names may be given to
this command, separated by : or whitespace. You may specify a directory that is already in the source
path; this moves it forward, so GDB searches it sooner.
You can use the string,
$cdir, to refer to the compilation directory (if one is recorded), and $cwd to refer to the current working directory. $cwd is not the same as .the former tracks the current working directory as it changes during your
GDB session, while the latter is immediately expanded to the current directory at
the time you add an entry to the source path.
directory
Reset the source path to empty again. This requires confirmation.
show directories
Print the source path; show which directories it contains.
If your source path is cluttered with directories that are no longer of
interest, GDB may sometimes cause confusion by finding the wrong versions of source.
You can correct the situation by the following methods.
Use
directory with no argument to reset the source path to empty.
Use
directory with suitable arguments to reinstall the directories you want in the source
path. You can add all the directories in one command.
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