bfd/

	* libbfd-in.h (_bfd_merge_section): New.
	(_bfd_write_merged_section): New.
	(_bfd_merged_section_offset): New.
	* libbfd.h: Rebuilt.
	* linker.c (_bfd_generic_link_output_symbols): Handle
	discard_sec_merge.
	* aoutx.h (aout_link_write_symbols): Likewise.
	* pdp11.c (aout_link_write_symbols): Likewise.
	* elflink.h (elf_link_add_object_symbols): Call _bfd_merge_section.
	(elf_bfd_final_link): Adjust global symbols pointing into SEC_MERGE
	sections.
	(elf_link_sec_merge_syms): New.
	(elf_link_input_bfd): Call _bfd_merged_section_offset
	and _bfd_write_merged_section.
	Handle discard_sec_merge.
	* elf-bfd.h (struct elf_link_hash_table): Add merge_info
	field.
	(struct bfd_elf_section_data): Likewise.
	* elf.c (_bfd_elf_make_section_from_shdr): Set SEC_MERGE and
	SEC_STRINGS section flags and entsize from their ELF counterparts.
	(_bfd_elf_link_hash_table_init): Initialize merge_info.
	(elf_fake_sections): Set SHF_MERGE, SHF_STRINGS and sh_entsize
	from their BFD counterparts.
	* merge.c: New file.
	* Makefile.am: Add strtab.lo.
	* Makefile.in: Rebuilt.
include/
	* bfdlink.h (bfd_link_discard): Add discard_sec_merge.
gas/
	* config/obj-elf.c (obj_elf_change_section): Add entsize argument,
	handle SHF_MERGE and SHF_STRINGS.
	(obj_elf_parse_section_letters): Set SHF_MERGE and SHF_STRINGS.
	(obj_elf_section): Allow additional argument specifying entity size.
	* write.c (adjust_reloc_syms): Keep relocations against local symbols
	in SEC_MERGE sections.
ld/
	* ldmain.c (main): Default to discard_sec_merge.
	* lexsup.c (OPTION_DISCARD_NONE): Define.
	(ld_options): Add --discard-none.
	(parse_args): Handle OPTION_DISCARD_NONE.
	* ldlang.c (wild_doit): SEC_MERGE should be set in the output
	section only if SEC_MERGE and SEC_STRINGS flags and entsize of
	all its input sections match.

1 files changed, 12 insertions, 0 deletions

diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 213ef84..601f351 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -1102,6 +1102,14 @@ typedef struct sec
      references found to any symbol in the section.  */
 #define SEC_CLINK 0x10000000
 
+  /* Attempt to merge identical entities in the section.
+     Entity size is given in the entsize field.  */
+#define SEC_MERGE 0x20000000
+
+  /* If given with SEC_MERGE, entities to merge are zero terminated strings
+     where entsize specifies character size instead of fixed size entries.  */
+#define SEC_STRINGS 0x40000000
+
   /*  End of section flags.  */
 
   /* Some internal packed boolean fields.  */
@@ -1214,6 +1222,10 @@ typedef struct sec
 
   unsigned int lineno_count;
 
+  /* Entity size for merging purposes.  */
+
+  unsigned int entsize;
+
   /* Optional information about a COMDAT entry; NULL if not COMDAT.  */
 
   struct bfd_comdat_info *comdat;