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Add a new variable that controls a way in which filenames are displayed. * NEWS (set filename-display): New entry. * source.c (filename_display_basename, filename_display_relative) (filename_display_absolute, filename_display_kind_names) (filename_display_string, show_filename_display_string) (symtab_to_filename_for_display): New. (_initialize_source): Added initialization of 'filename-display' variable. * source.h (symtab_to_filename_for_display): Added declaration. * stack.c (print_frame): Added new variable and calling of a new function and condition with this variable. Changed third argument of calling of a function. gdb/doc/ * gdb.texinfo (Backtrace): Added description of 'filename-display' variable in 'set/show backtrace' section. gdb/testsuite/ * gdb.dwarf2/dw2-dir-file-name.exp: New file. * gdb.dwarf2/dw2-dir-file-name.c: New file.