* config/obj-elf.c (obj_elf_type): Add code to support a type of

        gnu_unique_object.
        * doc/as.texinfo: Document new feature of .type directive.
        * NEWS: Mention support for gnu_unique_object symbol type.

        * common.h (STB_GNU_UNIQUE): Define.

        * NEWS: Mention the linker's support for symbols with a binding of
        STB_GNU_UNIQUE.

        * gas/elf/type.s: Add unique global symbol definition.
        * gas/elf/type.e: Add expected readelf output for global unique
        symbol.

        * elfcpp.h (enum STB): Add STB_GNU_UNIQUE.

        * readelf.c (get_symbol_binding): For Linux targeted files return
        UNIQUE for symbols with the STB_GNU_UNIQUE binding.
        * doc/binutils.texi: Document the meaning of the 'u' symbol
        binding in the output of nm and objdump --syms.

        * elf-bfd.h (struct elf_link_hash_entry): Add unique_global field.
        * elf.c (swap_out_syms): Set binding to STB_GNU_UNIQUE for symbols
        with the BSF_GNU_UNIQUE flag bit set.
        * elfcode.h (elf_slurp_symbol_table): Set the BSF_GNU_UNIQUE flag
        for symbols with STB_GNU_UNIQUE binding.
        * elflink.c (_bfd_elf_merge_symbol): Set unique_global for symbols
        with the STB_GNU_UNIQUE binding.
        (elf_link_add_object_symbols): Set the BSF_GNU_UNIQUE flag for
        symbols with STB_GNU_UNIQUE binding.  Set STB_GNU_UNIQUE for
        symbols with the unique_global field set.
        (elf_link_output_extsym): Set unique_global field for symbols with
        the STB_GNU_UNIQUE binding.
        * syms.c (struct bfd_symbol): Define BSF_GNU_UNIQUE flag bit.
        (bfd_print_symbol_vandf): Print a 'u' character for BSF_GNU_UNIQUE
        symbols.
        (bfd_decode_symclass): Return a 'u' character for BSF_GNU_UNIQUE
        symbols.
        * bfd-in2.h: Regenerate.

1 files changed, 14 insertions, 2 deletions

diff --git a/gas/config/obj-elf.c b/gas/config/obj-elf.c
index 3c72326..c9c7a9c 100644
--- a/gas/config/obj-elf.c
+++ b/gas/config/obj-elf.c
@@ -1665,8 +1665,8 @@ obj_elf_type (int ignore ATTRIBUTE_UNUSED)
 	}
     }
   else if (strcmp (typename, "gnu_indirect_function") == 0
-      || strcmp (typename, "10") == 0
-      || strcmp (typename, "STT_GNU_IFUNC") == 0)
+	   || strcmp (typename, "10") == 0
+	   || strcmp (typename, "STT_GNU_IFUNC") == 0)
     {
       const struct elf_backend_data *bed;
 
@@ -1678,6 +1678,18 @@ obj_elf_type (int ignore ATTRIBUTE_UNUSED)
 		typename);
       type = BSF_FUNCTION | BSF_GNU_INDIRECT_FUNCTION;
     }
+  else if (strcmp (typename, "gnu_unique_object") == 0)
+    {
+      const struct elf_backend_data *bed;
+
+      bed = get_elf_backend_data (stdoutput);
+      if (!(bed->elf_osabi == ELFOSABI_LINUX
+	    /* GNU/Linux is still using the default value 0.  */
+	    || bed->elf_osabi == ELFOSABI_NONE))
+	as_bad (_("symbol type \"%s\" is supported only by GNU targets"),
+		typename);
+      type = BSF_OBJECT | BSF_GNU_UNIQUE;
+    }
 #ifdef md_elf_symbol_type
   else if ((type = md_elf_symbol_type (typename, sym, elfsym)) != -1)
     ;