Function
dwarf_add_AT_comp_dir()
creates a
DW_AT_comp_dir
attribute descriptor and attaches it to the debugging information
entry referenced by argument
die.
The created attribute will have DWARF form
DW_FORM_strp.
Argument
die
should reference a debugging information entry allocated using
dwarf_new_die(3).
Argument
dir
should point to a NUL-terminated string which will become the value of
the created attribute.
If argument
err
is not NULL, it will be used to store error information in case
of an error.
