PR 1150

* readelf.c (get_mips_symbol_other): New function.
  (get_symbol_other): New function.
  (process_symbol_table): Call get_symbol_other() to get a description of the
    st_other field if it contains more information than just the visibility.
* elfxx-mips.c (mips_elf_calculate_relocation): Ignore an undefined symbol if
    it is optional.
  (_bfd_mips_elf_merge_symbol_attribute): Make sure that the optional flag is
    merged as well as the visibility.
* elfxx-mips.h (_bfd_mips_elf_merge_symbol_attribute): Prototype.
  (elf_backend_merge_symbol_attribute): Define.
* mips.h (STO_OPTIONAL): Define.
  (ELF_MIPS_IS_OPTIONAL): Define.

5 files changed, 51 insertions, 2 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index d74978eaf8b..fdc81a2f759 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,13 @@
+2005-11-11  Nick Clifton  <nickc@redhat.com>
+
+	PR 1150
+	* elfxx-mips.c (mips_elf_calculate_relocation): Ignore an
+	undefined symbol if it is optional.
+	(_bfd_mips_elf_merge_symbol_attribute): Make sure that the
+	optional flag is merged as well as the visibility.
+	* elfxx-mips.h (_bfd_mips_elf_merge_symbol_attribute): Prototype.
+	(elf_backend_merge_symbol_attribute): Define.
+
 2005-11-08  Nathan Sidwell  <nathan@codesourcery.com>
 
 	Add ms2 support
diff --git a/bfd/elfxx-mips.c b/bfd/elfxx-mips.c
index a3448491eb9..d4b90de3c34 100644
--- a/bfd/elfxx-mips.c
+++ b/bfd/elfxx-mips.c
@@ -3792,6 +3792,17 @@ mips_elf_calculate_relocation (bfd *abfd, bfd *input_bfd,
 	  BFD_ASSERT (bfd_get_section_by_name (abfd, ".dynamic") == NULL);
 	  symbol = 0;
 	}
+      else if (ELF_MIPS_IS_OPTIONAL (h->root.other))
+	{
+	  /* This is an optional symbol - an Irix specific extension to the
+	     ELF spec.  Ignore it for now.
+	     XXX - FIXME - there is more to the spec for OPTIONAL symbols
+	     than simply ignoring them, but we do not handle this for now.
+	     For information see the "64-bit ELF Object File Specification"
+	     which is available from here:
+	     http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf  */
+	  symbol = 0;
+	}
       else
 	{
 	  if (! ((*info->callbacks->undefined_symbol)
@@ -8867,8 +8878,7 @@ _bfd_elf_mips_get_relocated_section_contents
 		case bfd_reloc_undefined:
 		  if (!((*link_info->callbacks->undefined_symbol)
 			(link_info, bfd_asymbol_name (*(*parent)->sym_ptr_ptr),
-			 input_bfd, input_section, (*parent)->address,
-			 TRUE)))
+			 input_bfd, input_section, (*parent)->address, TRUE)))
 		    goto error_return;
 		  break;
 		case bfd_reloc_dangerous:
@@ -9994,3 +10004,16 @@ const struct bfd_elf_special_section _bfd_mips_elf_special_sections[] =
   { ".ucode",  6,  0, SHT_MIPS_UCODE, 0 },
   { NULL,      0,  0, 0,              0 }
 };
+
+/* Ensure that the STO_OPTIONAL flag is copied into h->other,
+   even if this is not a defintion of the symbol.  */
+void
+_bfd_mips_elf_merge_symbol_attribute (struct elf_link_hash_entry *h,
+				      const Elf_Internal_Sym *isym,
+				      bfd_boolean definition,
+				      bfd_boolean dynamic ATTRIBUTE_UNUSED)
+{
+  if (! definition
+      && ELF_MIPS_IS_OPTIONAL (isym->st_other))
+    h->other |= STO_OPTIONAL;
+}
diff --git a/bfd/elfxx-mips.h b/bfd/elfxx-mips.h
index d419435c110..3af342a2302 100644
--- a/bfd/elfxx-mips.h
+++ b/bfd/elfxx-mips.h
@@ -127,6 +127,8 @@ extern bfd_boolean _bfd_mips_relax_section
   (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
 extern bfd_vma _bfd_mips_elf_sign_extend
   (bfd_vma, int);
+extern void _bfd_mips_elf_merge_symbol_attribute
+  (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean, bfd_boolean);
 
 extern const struct bfd_elf_special_section _bfd_mips_elf_special_sections [];
 
@@ -134,3 +136,4 @@ extern const struct bfd_elf_special_section _bfd_mips_elf_special_sections [];
   _bfd_mips_elf_name_local_section_symbols
 #define elf_backend_special_sections _bfd_mips_elf_special_sections
 #define elf_backend_eh_frame_address_size _bfd_mips_elf_eh_frame_address_size
+#define elf_backend_merge_symbol_attribute  _bfd_mips_elf_merge_symbol_attribute
diff --git a/include/elf/ChangeLog b/include/elf/ChangeLog
index 485a78e32a8..af4947c7e3b 100644
--- a/include/elf/ChangeLog
+++ b/include/elf/ChangeLog
@@ -1,3 +1,9 @@
+2005-11-11  Nick Clifton  <nickc@redhat.com>
+
+	PR 1150
+	* mips.h (STO_OPTIONAL): Define.
+	(ELF_MIPS_IS_OPTIONAL): Define.
+
 2005-09-30  Catherine Moore  <clm@cm00re.com>
 
 	* bfin.h: New file.
diff --git a/include/elf/mips.h b/include/elf/mips.h
index 540815bfe76..6afc12ffe83 100644
--- a/include/elf/mips.h
+++ b/include/elf/mips.h
@@ -718,6 +718,13 @@ extern void bfd_mips_elf32_swap_reginfo_out
 
 /* This value is used for a mips16 .text symbol.  */
 #define STO_MIPS16		0xf0
+
+/* This bit is used on Irix to indicate a symbol whose definition
+   is optional - if, at final link time, it cannot be found, no
+   error message should be produced.  */
+#define STO_OPTIONAL		(1 << 2)
+/* A macro to examine the STO_OPTIONAL bit.  */
+#define ELF_MIPS_IS_OPTIONAL(other)	((other) & STO_OPTIONAL)
 
 /* The 64-bit MIPS ELF ABI uses an unusual reloc format.  Each
    relocation entry specifies up to three actual relocations, all at