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(struct xcoff_link_hash_table): Add descriptor_section and special_sections fields. (_bfd_xcoff_bfd_link_hash_table_create): Initialize new fields. (xcoff_link_add_symbols): Set linkage section alignment. Create descriptor section. Check for magic symbol names (_text, etc.), and record them in special_sections if found. Set XCOFF_DESCRIPTOR flag for a function descriptor, and set its descriptor field to point back to the function code symbol. (xcoff_sweep): Always mark the special descriptor_section. (bfd_xcoff_export_symbol): Check whether the symbol might be a function descriptor, and mark it if it is. (bfd_xcoff_size_dynamic_sections): Add new special_sections parameter, and fill it in. Allocate space for the descriptor section. (xcoff_build_ldsyms): Set XCOFF_DEF_REGULAR flag when defining global linkage code. If an undefined function descriptor is exported, arrange to define it. Warn about any other undefined exported symbol. (_bfd_xcoff_bfd_final_link): Write out the descriptor section. (xcoff_write_global_symbol): Create a function descriptor when necessary. * bfd-in.h (bfd_xcoff_size_dynamic_sections): Update declaration. * bfd-in2.h: Rebuild.