ELF visibility patch from Martin Loewis.

bfd/ChangeLog

@@ -1,3 +1,10 @@
+2000-01-03  Martin v. Loewis  <loewis@informatik.hu-berlin.de>
+
+	* elflink.c (_bfd_elf_link_record_dynamic_symbol): Process symbol
+	visibility.
+	* elflink.h (elf_link_add_object_symbols): Combine visibilities.
+	* elf.c (bfd_elf_print_symbol): Interpret st_other as visibility.
+
 1999-12-29  Richard Henderson  <rth@cygnus.com>
 
 	* elflink.h (bfd_elf,size_dynamic_sections): Don't export all

bfd/elf.c

@@ -761,6 +761,7 @@ bfd_elf_print_symbol (abfd, filep, symbol, how)
 	CONST char *section_name;
 	CONST char *name = NULL;
 	struct elf_backend_data *bed;
+	unsigned char st_other;
 	
 	section_name = symbol->section ? symbol->section->name : "(*none*)";
 
@@ -836,10 +837,19 @@ bfd_elf_print_symbol (abfd, filep, symbol, how)
 	  }
 
 	/* If the st_other field is not zero, print it.  */
-	if (((elf_symbol_type *) symbol)->internal_elf_sym.st_other != 0)
-	  fprintf (file, " 0x%02x",
-		   ((unsigned int)
-		    ((elf_symbol_type *) symbol)->internal_elf_sym.st_other));
+	st_other = ((elf_symbol_type *) symbol)->internal_elf_sym.st_other;
+	
+	switch (st_other)
+	  {
+	  case 0: break;
+	  case STV_INTERNAL:  fprintf (file, " .internal");  break;
+	  case STV_HIDDEN:    fprintf (file, " .hidden");    break;
+	  case STV_PROTECTED: fprintf (file, " .protected"); break;
+	  default:
+	    /* Some other non-defined flags are also present, so print
+	       everything hex.  */
+	    fprintf (file, " 0x%02x", (unsigned int) st_other);
+	  }
 
 	fprintf (file, " %s", name);
       }

bfd/elflink.c

@@ -218,6 +218,32 @@ _bfd_elf_link_record_dynamic_symbol (info, h)
       boolean copy;
       bfd_size_type indx;
 
+      /* XXX: The ABI draft says the linker must turn hidden and
+	 internal symbols into STB_LOCAL symbols when producing the
+	 DSO. However, if ld.so honors st_other in the dynamic table,
+	 this would not be necessary.  */
+      switch (ELF_ST_VISIBILITY (h->other))
+	{
+	case STV_INTERNAL:
+	case STV_HIDDEN:
+	  /* This symbol must be defined in the shared object or
+	     executable.  */
+	  if (h->root.type == bfd_link_hash_undefined)
+	    {
+	      bfd * abfd = h->root.u.undef.abfd;
+	      char * name = h->root.root.string;
+	      
+	      (*info->callbacks->undefined_symbol)
+		(info, name, abfd, bfd_und_section_ptr, 0);
+	    }
+	  
+	  h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
+	  break;
+	  
+	default:
+	  break;
+	}
+
       h->dynindx = elf_hash_table (info)->dynsymcount;
       ++elf_hash_table (info)->dynsymcount;
 

bfd/elflink.h

@@ -1566,9 +1566,24 @@ elf_link_add_object_symbols (abfd, info)
 	      h->type = ELF_ST_TYPE (sym.st_info);
 	    }
 
-	  if (sym.st_other != 0
-	      && (definition || h->other == 0))
-	    h->other = sym.st_other;
+	  /* If st_other has a processor-specific meaning, specific code
+	     might be needed here.  */
+	  if (sym.st_other != 0)
+	    {
+	      /* Combine visibilities, using the most constraining one.  */
+	      unsigned char hvis   = ELF_ST_VISIBILITY (h->other);
+	      unsigned char symvis = ELF_ST_VISIBILITY (sym.st_other);
+	      
+	      if (symvis && (hvis > symvis || hvis == 0))
+		h->other = sym.st_other;
+	      
+	      /* If neither has visibility, use the st_other of the
+	         definition.  This is an arbitrary choice, since the
+	         other bits have no general meaning.  */
+	      if (!symvis && !hvis
+		  && (definition || h->other == 0))
+		h->other = sym.st_other;
+	    }
 
 	  /* Set a flag in the hash table entry indicating the type of
 	     reference or definition we just found.  Keep a count of