Add new style linker support to COFF backend. a29k only for now.

* cofflink.c: New file.
	* libcoff-in.h: Include bfdlink.h.
	(obj_coff_external_syms, obj_coff_strings): Define accessor macro.
	(obj_coff_sym_hashes): Define accessor macro.
	(struct coff_tdata): Add fields external_syms, strings, and
	sym_hashes.
	(struct coff_link_hash_entry): Define.
	(struct coff_link_hash_table): Define.
	(coff_link_hash_lookup, coff_link_hash_traverse): Define.
	(coff_hash_table): Define.
	(_bfd_coff_link_hash_table_create): Declare.
	(_bfd_coff_link_add_symbols, _bfd_coff_final_link): Declare.
	* coffcode.h (bfd_coff_backend_data): Add fields _bfd_relsz,
	_bfd_coff_swap_reloc_in, _bfd_coff_sym_is_global,
	_bfd_coff_compute_section_file_positions,
	_bfd_coff_relocate_section.
	(bfd_coff_relsz, bfd_coff_swap_reloc_in): Define.
	(bfd_coff_sym_is_global): Define.
	(bfd_coff_compute_section_file_positions): Define.
	(bfd_coff_relocate_section): Define.
	(coff_mkobject_hook): Initialize obj_raw_syment_count and
	obj_conv_table_size.
	(coff_compute_section_file_positions): Set target_index of all
	sections.  Set output_has_begun field.
	(coff_write_object_contents): Don't set target_index; now done by
	coff_compute_section_file_positions.  Remove obsolete handling of
	scn_base and data_base.  Don't bother to check that target_index
	is positive, since it always is.  Remove use of pad, which is
	always zero.  Check obj_raw_syment_count, not bfd_get_symcount,
	for the number of symbols, but only write them out if
	bfd_get_symcount is non-zero.
	(coff_slurp_symbol_table): Use obj_raw_syment_count, not
	bfd_get_symcount for the number of symbols.  Don't set
	obj_conv_table_size.
	(coff_sym_is_global): New static function or macro.
	(coff_slurp_reloc_table): Call coff_swap_reloc_in, not
	bfd_swap_reloc_in.
	(coff_bfd_link_hash_table_create): If coff_relocate_section is
	defined, define as _bfd_coff_link_hash_table_create.
	(coff_bfd_link_add_symbols): Similar change.
	(coff_bfd_final_link): Similar change.
	(coff_relocate_section): Define as NULL if not defined.
	(bfd_coff_std_swap_table): Initialize new fields.
	* coffgen.c (coff_real_object_p): Don't set obj_raw_syment_count
	and obj_conv_table_size here.
	(coff_count_linenumbers): Reindent.  If bfd_get_symcount is zero,
	add up the line numbers from the sections.
	(coff_write_symbols): Don't set bfd_get_symcount.
	(coff_pointerize_aux): Don't pointerize a nonpositive x_endndx
	field.
	(coff_get_normalized_symtab): Use obj_raw_syment_count, not
	bfd_get_symcount.
	(coff_print_symbol): If auxp->fix_end, print x_endndx value.
	* coffswap.h (coff_swap_reloc_in): Rename from bfd_swap_reloc_in.
	Reindent.  Change argument type to  PTR.
	* coff-a29k.c (coff_a29k_relocate_section): New static function.
	(coff_relocate_section): Define.
	* configure.in (a29kcoff_big_vec): Compile cofflink.o.
	* coff-alpha.c (alpha_ecoff_backend_data): Initialize new fields.
	* coff-mips.c (mips_ecoff_backend_data): Likewise.
	* libcoff.h: Rebuilt.
	* Makefile.in: Rebuilt dependencies.
	(BFD32_BACKENDS): Add cofflink.o.
	(CFILES): Add cofflink.c.

bfd/coff-mips.c

@@ -542,7 +542,7 @@ mips_adjust_reloc_in (abfd, intern, rptr)
   /* If the type is MIPS_R_IGNORE, make sure this is a reference to
      the absolute section so that the reloc is ignored.  */
   if (intern->r_type == MIPS_R_IGNORE)
-    rptr->sym_ptr_ptr = bfd_abs_section.symbol_ptr_ptr;
+    rptr->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 
   /* If this is a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELHI or
      MIPS_R_RELLO reloc, we want the addend field of the BFD relocto
@@ -657,7 +657,7 @@ mips_refhi_reloc (abfd,
     }
 
   ret = bfd_reloc_ok;
-  if (symbol->section == &bfd_und_section
+  if (bfd_is_und_section (symbol->section)
       && output_bfd == (bfd *) NULL)
     ret = bfd_reloc_undefined;
 
@@ -784,7 +784,7 @@ mips_gprel_reloc (abfd,
       output_bfd = symbol->section->output_section->owner;
     }
 
-  if (symbol->section == &bfd_und_section
+  if (bfd_is_und_section (symbol->section)
       && relocateable == false)
     return bfd_reloc_undefined;
 
@@ -925,7 +925,7 @@ mips_relhi_reloc (abfd,
     }
 
   ret = bfd_reloc_ok;
-  if (symbol->section == &bfd_und_section
+  if (bfd_is_und_section (symbol->section)
       && output_bfd == (bfd *) NULL)
     ret = bfd_reloc_undefined;
 
@@ -990,7 +990,7 @@ mips_rello_reloc (abfd,
 	 symbol is not defined we don't want to do this, because we
 	 don't want the value in the object file to incorporate the
 	 address of the reloc.  */
-      if (bfd_get_section (symbol) != &bfd_und_section
+      if (! bfd_is_und_section (bfd_get_section (symbol))
 	  && ! bfd_is_com_section (bfd_get_section (symbol)))
 	val -= (input_section->output_section->vma
 		+ input_section->output_offset
@@ -2275,13 +2275,14 @@ static const struct ecoff_backend_data mips_ecoff_backend_data =
     (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* reloc_out */
     mips_ecoff_swap_filehdr_out, mips_ecoff_swap_aouthdr_out,
     mips_ecoff_swap_scnhdr_out,
-    FILHSZ, AOUTSZ, SCNHSZ, 0, 0, 0, true,
+    FILHSZ, AOUTSZ, SCNHSZ, 0, 0, 0, 0, true,
     mips_ecoff_swap_filehdr_in, mips_ecoff_swap_aouthdr_in,
-    mips_ecoff_swap_scnhdr_in, mips_ecoff_bad_format_hook,
-    _bfd_ecoff_set_arch_mach_hook, _bfd_ecoff_mkobject_hook,
-    _bfd_ecoff_styp_to_sec_flags, _bfd_ecoff_make_section_hook,
-    _bfd_ecoff_set_alignment_hook, _bfd_ecoff_slurp_symbol_table,
-    NULL, NULL
+    mips_ecoff_swap_scnhdr_in, NULL,
+    mips_ecoff_bad_format_hook, _bfd_ecoff_set_arch_mach_hook,
+    _bfd_ecoff_mkobject_hook, _bfd_ecoff_styp_to_sec_flags,
+    _bfd_ecoff_make_section_hook, _bfd_ecoff_set_alignment_hook,
+    _bfd_ecoff_slurp_symbol_table,
+    NULL, NULL, NULL, NULL, NULL, NULL
   },
   /* Supported architecture.  */
   bfd_arch_mips,