Based on patch from H. Peter Anvin <hpa@transmeta.com>:
* objcopy.c (struct section_list): Add copy field.
(sections_copied): New static variable.
(copy_options): Add "only-section".
(copy_usage): Mention -j and --only-section.
(find_section_list): Initialize copy field.
(is_strip_section): Check for copying sections.
(copy_object): Check sections_copied when calling filter_symbols.
(setup_section): Check for copying sections.
(copy_section): Likewise.
(copy_main): Handle -j/--only-section.
* binutils.texi, objcopy.1: Document -j/--only-section.