path: root/patches/0001-Add-STB_SECONDARY-support.patch

From 05748d33155caa12e51b2a39a3b1470bba156c0a Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Sun, 26 Nov 2017 09:26:34 -0800
Subject: [PATCH] Add STB_SECONDARY support

STB_SECONDARY is similar to STB_WEAK. But a STB_SECONDARY definition
can be overridden by STB_GLOBAL or STB_WEAK definition at link-time
as well as run-time.  Linker also search archive library and extract
archive members to resolve defined and undefined STB_SECONDARY symbol.

bfd/

	* archive.c (_bfd_compute_and_write_armap): Treat BSF_SECONDARY
	symbol as global.
	* elf32-mips.c (mips_elf_sym_is_global): Likewise.
	* elfn32-mips.c (mips_elf_sym_is_global): Likewise.
	* elf.c (sym_is_global): Likewise.
	(swap_out_syms): Output undefined secondary symbols as weak.
	Output defined secondary symbols.
	* elf64-ia64-vms.c (elf64_vms_link_add_object_symbols): Handle
	secondary symbols.
	* elfcode.h (elf_slurp_symbol_table): Likewise.
	* elflink.c (_bfd_elf_merge_symbol): Add a boolean argument to
	indicate if the old definition is secondary.  Set OLDSECONADRY if
	it isn't TRUE.   Treat old secondary symbol as weak.  Allow
	overriding secondary symbols.
	(_bfd_elf_add_default_symbol): Add a boolean argument to if the
	old definition is secondary.  Handle the unversioned
	STB_SECONDARY symbol with the versioned definition.
	* elflink.c (is_global_data_symbol_definition): Renamed to ...
	(is_global_symbol_definition): This.  Add an argument to ignore
	secondary symbols.  If secondary symbols are ignored, count
	function and common symbols as global definition.
	(elf_link_is_defined_archive_symbol): Add an argument to ignore
	secondary symbols.  Updated.
	(elf_link_add_object_symbols): Treat secondary symbols as weak
	symbols.  Allow overriding secondary symbols.  Pass oldsecondary
	to _bfd_elf_merge_symbol and _bfd_elf_add_default_symbol.
	(elf_link_add_archive_symbols): Keep searching if a definition
	is secondary.  Ignore another secondary definition.  Updated.
	(elf_link_output_extsym): Generate STB_SECONDARY symbols if
	needed.
	* linker.c (_bfd_generic_link_add_one_symbol): Treat secondary
	symbol as weak symbol.  Mark secondary symbol.
	* syms.c (BSF_SECONDARY): New.
	(bfd_print_symbol_vandf): Handle SECONDARY symbol.
	(bfd_decode_symclass): Likewise.
	* bfd-in2.h: Regenerated.

binutils/

	* nm.c (filter_symbols): Treat BSF_SECONDARY symbol as global.
	* readelf.c (get_symbol_binding): Handle STB_SECONDARY.

gas/

	* symbols.c (S_IS_SECONDARY): New.
	(S_SET_SECONDARY): Likewise.
	(S_FORCE_RELOC): Handle BSF_SECONDARY like BSF_WEAK.
	(S_SET_EXTERNAL): Likewise.
	(S_CLEAR_EXTERNAL): Likewise.
	(S_CLEAR_WEAKREFD): Likewise.
	(S_SET_WEAK): Also clear BSF_SECONDARY.
	* symbols.h (S_IS_SECONDARY): New.
	(S_SET_SECONDARY): Likewise.
	* config/obj-elf.c (obj_elf_secondary): New.
	(elf_pseudo_table): Add "secondary".
	(obj_elf_weak): Don't set symbol weak on secondary symbol.
	(elf_frob_symbol): Check secondary symbol.  Handle secondary
	symbol for .symver.  Also remove the unused secondary symbol.
	(elf_frob_file_before_adjust): Treat secondary symbols as weak.
	* doc/as.texinfo: Document .secondary directive.

gas/testsuite/

	* gas/elf/common5.d: New file.
	* gas/elf/common5.l: Likewise.
	* gas/elf/common5.s: Likewise.
	* gas/elf/common6.d: Likewise.
	* gas/elf/common6.l: Likewise.
	* gas/elf/common6.s: Likewise.
	* gas/elf/secondary1.e: Likewise.
	* gas/elf/secondary1.s: Likewise.
	* gas/elf/secondary2.e: Likewise.
	* gas/elf/secondary2.s: Likewise.
	* gas/elf/elf.exp: Run common5, common6, secondary1 and
	secondary2.
	* gas/elf/type.s: Add .secondary tests.
	* gas/elf/type.e: Updated.

include/

	* bfdlink.h (bfd_link_hash_entry): Add secondary.
	(bfd_link_info): Add emit_secondary.

include/elf/

	* common.h (STB_SECONDARY): New.

ld/

	* ld.texinfo: Document "-z nosecondary".
	* ldmain.c (main): Initialize link_info.emit_secondary to TRUE.
	* lexsup.c (elf_shlib_list_options): Add "-z nosecondary".
	* emultempl/elf.em (gld${EMULATION_NAME}_handle_option): Set
	to link_info.emit_secondary to FALSE for "-z nosecondary".

ld/testsuite/

	* ld-elf/library1.c: New file.
	* ld-elf/library1.out: Likewise.
	* ld-elf/library2.c: Likewise.
	* ld-elf/library2.out: Likewise.
	* ld-elf/library3.out: Likewise.
	* ld-elf/library4.out: Likewise.
	* ld-elf/library5a.c: Likewise.
	* ld-elf/library5b.c: Likewise.
	* ld-elf/library6a.c: Likewise.
	* ld-elf/library6b.c: Likewise.
	* ld-elf/library6c.c: Likewise.
	* ld-elf/library7a.c: Likewise.
	* ld-elf/library7b.c: Likewise.
	* ld-elf/library7c.c: Likewise.
	* ld-elf/library8.map: Likewise.
	* ld-elf/library8a.c: Likewise.
	* ld-elf/library8a.rd: Likewise.
	* ld-elf/library8b.c: Likewise.
	* ld-elf/library8b.rd: Likewise.
	* ld-elf/library8c.c: Likewise.
	* ld-elf/library8c.rd: Likewise.
	* ld-elf/secondary-foo.c: Likewise.
	* ld-elf/secondary-main.c: Likewise.
	* ld-elf/secondary.c: Likewise.
	* ld-elf/secondary.exp: Likewise.
	* ld-elf/secondary.rd: Likewise.
	* ld-elf/secondary1.out: Likewise.
	* ld-elf/secondary1.rd: Likewise.
	* ld-elf/secondary2.rd: Likewise.
	* ld-elf/secondary3.rd: Likewise.
	* ld-elf/secondary3a.s: Likewise.
	* ld-elf/secondary3b.s: Likewise.
	* ld-elf/secondary4.rd: Likewise.
	* ld-elf/secondary4.s: Likewise.
	* ld-elf/secondary5.c: Likewise.
	* ld-elf/secondary5.out: Likewise.
	* ld-elf/secondary6.c: Likewise.
	* ld-elf/secondary6.out: Likewise.
	* ld-elf/secondary7.c: Likewise.
	* ld-elf/secondary7.out: Likewise.
	* ld-elf/secondary8a.c: Likewise.
	* ld-elf/secondary8a.map: Likewise.
	* ld-elf/secondary8a.rd: Likewise.
	* ld-elf/secondary8b.c: Likewise.
	* ld-elf/secondary8b.rd: Likewise.
---
 bfd/archive.c                        |   1 +
 bfd/bfd-in2.h                        |   4 +
 bfd/elf.c                            |  10 +-
 bfd/elf32-mips.c                     |   5 +-
 bfd/elf64-ia64-vms.c                 |   4 +
 bfd/elfcode.h                        |   3 +
 bfd/elflink.c                        | 177 ++++++++++++++++++-------
 bfd/elfn32-mips.c                    |   5 +-
 bfd/linker.c                         |  40 ++++++
 bfd/syms.c                           |  14 ++
 binutils/nm.c                        |   1 +
 binutils/readelf.c                   |   1 +
 gas/config/obj-elf.c                 |  44 ++++++-
 gas/doc/as.texi                      |   9 ++
 gas/symbols.c                        |  39 ++++--
 gas/symbols.h                        |   2 +
 gas/testsuite/gas/elf/common6.d      |   2 +
 gas/testsuite/gas/elf/common6.l      |   2 +
 gas/testsuite/gas/elf/common6.s      |   2 +
 gas/testsuite/gas/elf/common7.d      |   2 +
 gas/testsuite/gas/elf/common7.l      |   2 +
 gas/testsuite/gas/elf/common7.s      |   2 +
 gas/testsuite/gas/elf/elf.exp        |   5 +
 gas/testsuite/gas/elf/secondary1.e   |   4 +
 gas/testsuite/gas/elf/secondary1.s   |  33 +++++
 gas/testsuite/gas/elf/secondary2.e   |   1 +
 gas/testsuite/gas/elf/secondary2.s   |   5 +
 gas/testsuite/gas/elf/type.e         |   2 +
 gas/testsuite/gas/elf/type.s         |  13 +-
 include/bfdlink.h                    |   6 +
 include/elf/common.h                 |   1 +
 ld/emultempl/elf.em                  |   2 +
 ld/ld.texi                           |   4 +
 ld/ldmain.c                          |   1 +
 ld/lexsup.c                          |   2 +
 ld/testsuite/ld-elf/library1.c       |  11 ++
 ld/testsuite/ld-elf/library1.out     |   1 +
 ld/testsuite/ld-elf/library2.c       |  12 ++
 ld/testsuite/ld-elf/library2.out     |   1 +
 ld/testsuite/ld-elf/library3.out     |   1 +
 ld/testsuite/ld-elf/library4.out     |   1 +
 ld/testsuite/ld-elf/library5a.c      |  16 +++
 ld/testsuite/ld-elf/library5b.c      |  10 ++
 ld/testsuite/ld-elf/library6a.c      |   4 +
 ld/testsuite/ld-elf/library6b.c      |   7 +
 ld/testsuite/ld-elf/library6c.c      |   9 ++
 ld/testsuite/ld-elf/library7a.c      |   1 +
 ld/testsuite/ld-elf/library7b.c      |   7 +
 ld/testsuite/ld-elf/library7c.c      |   3 +
 ld/testsuite/ld-elf/library8.map     |   4 +
 ld/testsuite/ld-elf/library8a.c      |  10 ++
 ld/testsuite/ld-elf/library8a.rd     |   5 +
 ld/testsuite/ld-elf/library8b.c      |   4 +
 ld/testsuite/ld-elf/library8b.rd     |   5 +
 ld/testsuite/ld-elf/library8c.c      |   7 +
 ld/testsuite/ld-elf/library8c.rd     |   5 +
 ld/testsuite/ld-elf/secondary-foo.c  |   7 +
 ld/testsuite/ld-elf/secondary-main.c |   8 ++
 ld/testsuite/ld-elf/secondary.c      |   9 ++
 ld/testsuite/ld-elf/secondary.exp    | 186 +++++++++++++++++++++++++++
 ld/testsuite/ld-elf/secondary.rd     |   5 +
 ld/testsuite/ld-elf/secondary1.out   |   1 +
 ld/testsuite/ld-elf/secondary1.rd    |   5 +
 ld/testsuite/ld-elf/secondary2.rd    |   5 +
 ld/testsuite/ld-elf/secondary3.rd    |   6 +
 ld/testsuite/ld-elf/secondary3a.s    |   4 +
 ld/testsuite/ld-elf/secondary3b.s    |  20 +++
 ld/testsuite/ld-elf/secondary4.rd    |   5 +
 ld/testsuite/ld-elf/secondary4.s     |   9 ++
 ld/testsuite/ld-elf/secondary5.c     |  10 ++
 ld/testsuite/ld-elf/secondary5.out   |   3 +
 ld/testsuite/ld-elf/secondary6.c     |  11 ++
 ld/testsuite/ld-elf/secondary6.out   |   1 +
 ld/testsuite/ld-elf/secondary7.c     |  13 ++
 ld/testsuite/ld-elf/secondary7.out   |   1 +
 ld/testsuite/ld-elf/secondary8a.c    |  13 ++
 ld/testsuite/ld-elf/secondary8a.map  |   4 +
 ld/testsuite/ld-elf/secondary8a.rd   |   5 +
 ld/testsuite/ld-elf/secondary8b.c    |  13 ++
 ld/testsuite/ld-elf/secondary8b.rd   |   5 +
 80 files changed, 861 insertions(+), 62 deletions(-)
 create mode 100644 gas/testsuite/gas/elf/common6.d
 create mode 100644 gas/testsuite/gas/elf/common6.l
 create mode 100644 gas/testsuite/gas/elf/common6.s
 create mode 100644 gas/testsuite/gas/elf/common7.d
 create mode 100644 gas/testsuite/gas/elf/common7.l
 create mode 100644 gas/testsuite/gas/elf/common7.s
 create mode 100644 gas/testsuite/gas/elf/secondary1.e
 create mode 100644 gas/testsuite/gas/elf/secondary1.s
 create mode 100644 gas/testsuite/gas/elf/secondary2.e
 create mode 100644 gas/testsuite/gas/elf/secondary2.s
 create mode 100644 ld/testsuite/ld-elf/library1.c
 create mode 100644 ld/testsuite/ld-elf/library1.out
 create mode 100644 ld/testsuite/ld-elf/library2.c
 create mode 100644 ld/testsuite/ld-elf/library2.out
 create mode 100644 ld/testsuite/ld-elf/library3.out
 create mode 100644 ld/testsuite/ld-elf/library4.out
 create mode 100644 ld/testsuite/ld-elf/library5a.c
 create mode 100644 ld/testsuite/ld-elf/library5b.c
 create mode 100644 ld/testsuite/ld-elf/library6a.c
 create mode 100644 ld/testsuite/ld-elf/library6b.c
 create mode 100644 ld/testsuite/ld-elf/library6c.c
 create mode 100644 ld/testsuite/ld-elf/library7a.c
 create mode 100644 ld/testsuite/ld-elf/library7b.c
 create mode 100644 ld/testsuite/ld-elf/library7c.c
 create mode 100644 ld/testsuite/ld-elf/library8.map
 create mode 100644 ld/testsuite/ld-elf/library8a.c
 create mode 100644 ld/testsuite/ld-elf/library8a.rd
 create mode 100644 ld/testsuite/ld-elf/library8b.c
 create mode 100644 ld/testsuite/ld-elf/library8b.rd
 create mode 100644 ld/testsuite/ld-elf/library8c.c
 create mode 100644 ld/testsuite/ld-elf/library8c.rd
 create mode 100644 ld/testsuite/ld-elf/secondary-foo.c
 create mode 100644 ld/testsuite/ld-elf/secondary-main.c
 create mode 100644 ld/testsuite/ld-elf/secondary.c
 create mode 100644 ld/testsuite/ld-elf/secondary.exp
 create mode 100644 ld/testsuite/ld-elf/secondary.rd
 create mode 100644 ld/testsuite/ld-elf/secondary1.out
 create mode 100644 ld/testsuite/ld-elf/secondary1.rd
 create mode 100644 ld/testsuite/ld-elf/secondary2.rd
 create mode 100644 ld/testsuite/ld-elf/secondary3.rd
 create mode 100644 ld/testsuite/ld-elf/secondary3a.s
 create mode 100644 ld/testsuite/ld-elf/secondary3b.s
 create mode 100644 ld/testsuite/ld-elf/secondary4.rd
 create mode 100644 ld/testsuite/ld-elf/secondary4.s
 create mode 100644 ld/testsuite/ld-elf/secondary5.c
 create mode 100644 ld/testsuite/ld-elf/secondary5.out
 create mode 100644 ld/testsuite/ld-elf/secondary6.c
 create mode 100644 ld/testsuite/ld-elf/secondary6.out
 create mode 100644 ld/testsuite/ld-elf/secondary7.c
 create mode 100644 ld/testsuite/ld-elf/secondary7.out
 create mode 100644 ld/testsuite/ld-elf/secondary8a.c
 create mode 100644 ld/testsuite/ld-elf/secondary8a.map
 create mode 100644 ld/testsuite/ld-elf/secondary8a.rd
 create mode 100644 ld/testsuite/ld-elf/secondary8b.c
 create mode 100644 ld/testsuite/ld-elf/secondary8b.rd

diff --git a/bfd/archive.c b/bfd/archive.c
index 3423a336956..1a142ec1b13 100644
--- a/bfd/archive.c
+++ b/bfd/archive.c
@@ -2345,6 +2345,7 @@ _bfd_compute_and_write_armap (bfd *arch, unsigned int elength)
 
 		  if (((flags & (BSF_GLOBAL
 				 | BSF_WEAK
+				 | BSF_SECONDARY
 				 | BSF_INDIRECT
 				 | BSF_GNU_UNIQUE)) != 0
 		       || bfd_is_com_section (sec))
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 7aa64556b84..bba1c131fed 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -6390,6 +6390,10 @@ typedef struct bfd_symbol
      with this name and type in use.  BSF_OBJECT must also be set.  */
 #define BSF_GNU_UNIQUE          (1 << 23)
 
+  /* A secondary global symbol, overridable without warnings by
+     a regular or weak global symbol of the same name.  */
+#define BSF_SECONDARY          (1 << 24)
+
   flagword flags;
 
   /* A pointer to the section to which this symbol is
diff --git a/bfd/elf.c b/bfd/elf.c
index 1780074f5ab..6def11ee77a 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -4057,7 +4057,10 @@ sym_is_global (bfd *abfd, asymbol *sym)
   if (bed->elf_backend_sym_is_global)
     return (*bed->elf_backend_sym_is_global) (abfd, sym);
 
-  return ((sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) != 0
+  return ((sym->flags & (BSF_GLOBAL
+			 | BSF_WEAK
+			 | BSF_SECONDARY
+			 | BSF_GNU_UNIQUE)) != 0
 	  || bfd_is_und_section (bfd_asymbol_section (sym))
 	  || bfd_is_com_section (bfd_asymbol_section (sym)));
 }
@@ -8368,8 +8371,9 @@ Unable to handle section index %x in ELF symbol.  Using ABS instead."),
 	    }
 	  sym.st_info = ELF_ST_INFO (STB_GLOBAL, type);
 	}
+      /* Output undefined secondary symbols as weak.  */
       else if (bfd_is_und_section (syms[idx]->section))
-	sym.st_info = ELF_ST_INFO (((flags & BSF_WEAK)
+	sym.st_info = ELF_ST_INFO (((flags & (BSF_WEAK | BSF_SECONDARY))
 				    ? STB_WEAK
 				    : STB_GLOBAL),
 				   type);
@@ -8383,6 +8387,8 @@ Unable to handle section index %x in ELF symbol.  Using ABS instead."),
 	    bind = STB_LOCAL;
 	  else if (flags & BSF_GNU_UNIQUE)
 	    bind = STB_GNU_UNIQUE;
+	  else if (flags & BSF_SECONDARY)
+	    bind = STB_SECONDARY;
 	  else if (flags & BSF_WEAK)
 	    bind = STB_WEAK;
 	  else if (flags & BSF_GLOBAL)
diff --git a/bfd/elf32-mips.c b/bfd/elf32-mips.c
index e3c4f5594ff..5e1a6a48a5b 100644
--- a/bfd/elf32-mips.c
+++ b/bfd/elf32-mips.c
@@ -2280,7 +2280,10 @@ mips_elf_sym_is_global (bfd *abfd ATTRIBUTE_UNUSED, asymbol *sym)
   if (SGI_COMPAT (abfd))
     return (sym->flags & BSF_SECTION_SYM) == 0;
   else
-    return ((sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) != 0
+    return ((sym->flags & (BSF_GLOBAL
+			   | BSF_WEAK
+			   | BSF_SECONDARY
+			   | BSF_GNU_UNIQUE)) != 0
 	    || bfd_is_und_section (bfd_asymbol_section (sym))
 	    || bfd_is_com_section (bfd_asymbol_section (sym)));
 }
diff --git a/bfd/elf64-ia64-vms.c b/bfd/elf64-ia64-vms.c
index d40fa4277a2..35a6150f721 100644
--- a/bfd/elf64-ia64-vms.c
+++ b/bfd/elf64-ia64-vms.c
@@ -4954,6 +4954,10 @@ elf64_vms_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
 	  flags = BSF_WEAK;
 	  break;
 
+	case STB_SECONDARY:
+	  flags = BSF_SECONDARY;
+	  break;
+
 	case STB_GNU_UNIQUE:
 	  flags = BSF_GNU_UNIQUE;
 	  break;
diff --git a/bfd/elfcode.h b/bfd/elfcode.h
index 68db3e9ee3d..e92818f67eb 100644
--- a/bfd/elfcode.h
+++ b/bfd/elfcode.h
@@ -1324,6 +1324,9 @@ elf_slurp_symbol_table (bfd *abfd, asymbol **symptrs, bfd_boolean dynamic)
 	    case STB_WEAK:
 	      sym->symbol.flags |= BSF_WEAK;
 	      break;
+	    case STB_SECONDARY:
+	      sym->symbol.flags |= BSF_SECONDARY;
+	      break;
 	    case STB_GNU_UNIQUE:
 	      sym->symbol.flags |= BSF_GNU_UNIQUE;
 	      break;
diff --git a/bfd/elflink.c b/bfd/elflink.c
index 7c0849423a3..9b076744762 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -1027,7 +1027,8 @@ elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
    overriding a new definition.  We set TYPE_CHANGE_OK if it is OK for
    the type to change.  We set SIZE_CHANGE_OK if it is OK for the size
    to change.  By OK to change, we mean that we shouldn't warn if the
-   type or size does change.  */
+   type or size does change.  If OLDSECONARY is TRUE, the old definion
+   is a secondary symbol.  */
 
 static bfd_boolean
 _bfd_elf_merge_symbol (bfd *abfd,
@@ -1037,6 +1038,7 @@ _bfd_elf_merge_symbol (bfd *abfd,
 		       asection **psec,
 		       bfd_vma *pvalue,
 		       struct elf_link_hash_entry **sym_hash,
+		       bfd_boolean oldsecondary,
 		       bfd **poldbfd,
 		       bfd_boolean *pold_weak,
 		       unsigned int *pold_alignment,
@@ -1053,7 +1055,7 @@ _bfd_elf_merge_symbol (bfd *abfd,
   int bind;
   bfd *oldbfd;
   bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
-  bfd_boolean newweak, oldweak, newfunc, oldfunc;
+  bfd_boolean newweak, oldweak, newfunc, oldfunc, weakbind;
   const struct elf_backend_data *bed;
   char *new_version;
   bfd_boolean default_sym = *matched;
@@ -1175,9 +1177,17 @@ _bfd_elf_merge_symbol (bfd *abfd,
   if (poldbfd && *poldbfd == NULL)
     *poldbfd = oldbfd;
 
+  /* Set OLDSECONADRY if it isn't TRUE.  */
+  if (!oldsecondary)
+    oldsecondary = h->root.secondary != 0;
+
+  /* Treat secondary symbols as weak symbols.  */
+  weakbind = bind == STB_WEAK || bind == STB_SECONDARY;
+
   /* Differentiate strong and weak symbols.  */
-  newweak = bind == STB_WEAK;
-  oldweak = (h->root.type == bfd_link_hash_defweak
+  newweak = weakbind;
+  oldweak = (oldsecondary
+	     || h->root.type == bfd_link_hash_defweak
 	     || h->root.type == bfd_link_hash_undefweak);
   if (pold_weak)
     *pold_weak = oldweak;
@@ -1203,7 +1213,7 @@ _bfd_elf_merge_symbol (bfd *abfd,
     {
       if (bfd_is_und_section (sec))
 	{
-	  if (bind != STB_WEAK)
+	  if (!weakbind)
 	    {
 	      h->ref_dynamic_nonweak = 1;
 	      hi->ref_dynamic_nonweak = 1;
@@ -1499,7 +1509,7 @@ _bfd_elf_merge_symbol (bfd *abfd,
 
   if (newdef && !newdyn && (olddyn || h->root.ldscript_def))
     newweak = FALSE;
-  if (olddef && newdyn)
+  if (olddef && newdyn && !oldsecondary)
     oldweak = FALSE;
 
   /* Allow changes between different types of function symbol.  */
@@ -1627,10 +1637,14 @@ _bfd_elf_merge_symbol (bfd *abfd,
      represent variables; this can cause confusion in principle, but
      any such confusion would seem to indicate an erroneous program or
      shared library.  We also permit a common symbol in a regular
-     object to override a weak symbol in a shared object.  */
+     object to override a weak symbol in a shared object.
+
+     We let a definition in a dynamic object override the old secondary
+     symbol.  */
 
   if (newdyn
       && newdef
+      && !oldsecondary
       && (olddef
 	  || (h->root.type == bfd_link_hash_common
 	      && (newweak || newfunc))))
@@ -1669,8 +1683,9 @@ _bfd_elf_merge_symbol (bfd *abfd,
       *size_change_ok = TRUE;
     }
 
-  /* Skip weak definitions of symbols that are already defined.  */
-  if (newdef && olddef && newweak)
+  /* Skip weak definitions of symbols that are already defined unless
+     the old definition is secondary.  */
+  if (newdef && olddef && newweak && !oldsecondary)
     {
       /* Don't skip new non-IR weak syms.  */
       if (!(oldbfd != NULL
@@ -1701,18 +1716,20 @@ _bfd_elf_merge_symbol (bfd *abfd,
      always take precedence over symbols from dynamic objects, even if
      they are defined after the dynamic object in the link.
 
+     The new non-secondary definition overrides the old secondary
+     definition.
+
      As above, we again permit a common symbol in a regular object to
      override a definition in a shared object if the shared object
      symbol is a function or is weak.  */
 
   flip = NULL;
-  if (!newdyn
+  if (((!newdyn && olddyn && h->def_dynamic) || oldsecondary)
+      && bind != STB_SECONDARY
       && (newdef
 	  || (bfd_is_com_section (sec)
 	      && (oldweak || oldfunc)))
-      && olddyn
-      && olddef
-      && h->def_dynamic)
+      && olddef)
     {
       /* Change the hash table entry to undefined, and let
 	 _bfd_generic_link_add_one_symbol do the right thing with the
@@ -1814,8 +1831,8 @@ _bfd_elf_merge_symbol (bfd *abfd,
 
 /* This function is called to create an indirect symbol from the
    default for the symbol with the default version if needed. The
-   symbol is described by H, NAME, SYM, SEC, and VALUE.  We
-   set DYNSYM if the new indirect symbol is dynamic.  */
+   symbol is described by H, NAME, SYM, SEC, VALUE, and OLDSECONDARY.
+   We set DYNSYM if the new indirect symbol is dynamic.  */
 
 static bfd_boolean
 _bfd_elf_add_default_symbol (bfd *abfd,
@@ -1825,6 +1842,7 @@ _bfd_elf_add_default_symbol (bfd *abfd,
 			     Elf_Internal_Sym *sym,
 			     asection *sec,
 			     bfd_vma value,
+			     bfd_boolean oldsecondary,
 			     bfd **poldbfd,
 			     bfd_boolean *dynsym)
 {
@@ -1877,6 +1895,11 @@ _bfd_elf_add_default_symbol (bfd *abfd,
 	return TRUE;
     }
 
+  /* Handle the unversioned STB_SECONDARY symbol with the versioned
+     definition.  */
+  if (p == NULL)
+    return TRUE;
+
   bed = get_elf_backend_data (abfd);
   collect = bed->collect;
   dynamic = (abfd->flags & DYNAMIC) != 0;
@@ -1897,8 +1920,9 @@ _bfd_elf_add_default_symbol (bfd *abfd,
   matched = TRUE;
   tmp_sec = sec;
   if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
-			      &hi, poldbfd, NULL, NULL, &skip, &override,
-			      &type_change_ok, &size_change_ok, &matched))
+			      &hi, oldsecondary, poldbfd, NULL, NULL,
+			      &skip, &override, &type_change_ok,
+			      &size_change_ok, &matched))
     return FALSE;
 
   if (skip)
@@ -2052,8 +2076,9 @@ _bfd_elf_add_default_symbol (bfd *abfd,
   size_change_ok = FALSE;
   tmp_sec = sec;
   if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
-			      &hi, poldbfd, NULL, NULL, &skip, &override,
-			      &type_change_ok, &size_change_ok, &matched))
+			      &hi, oldsecondary, poldbfd, NULL, NULL, &skip,
+			      &override, &type_change_ok, &size_change_ok,
+			      &matched))
     return FALSE;
 
   if (skip)
@@ -3331,31 +3356,41 @@ _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
   return tls;
 }
 
-/* Return TRUE iff this is a non-common, definition of a non-function symbol.  */
+/* Return TRUE iff this is a non-common, definition of a
+   non-function symbol, unless IGNORE_SECONDARY is TRUE.  */
+
 static bfd_boolean
-is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
-				  Elf_Internal_Sym *sym)
+is_global_symbol_definition (bfd *abfd, Elf_Internal_Sym *sym,
+			     bfd_boolean ignore_secondary)
 {
-  const struct elf_backend_data *bed;
+  /* Ignore secondary symbols.  */
+  if (ignore_secondary && ELF_ST_BIND (sym->st_info) == STB_SECONDARY)
+    return FALSE;
 
   /* Local symbols do not count, but target specific ones might.  */
   if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
       && ELF_ST_BIND (sym->st_info) < STB_LOOS)
     return FALSE;
 
-  bed = get_elf_backend_data (abfd);
-  /* Function symbols do not count.  */
-  if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
-    return FALSE;
-
   /* If the section is undefined, then so is the symbol.  */
   if (sym->st_shndx == SHN_UNDEF)
     return FALSE;
 
-  /* If the symbol is defined in the common section, then
-     it is a common definition and so does not count.  */
-  if (bed->common_definition (sym))
-    return FALSE;
+  /* If secondary symbols are ignored, count function and common
+     symbols as global definition.  */
+  if (!ignore_secondary)
+    {
+      const struct elf_backend_data *bed = get_elf_backend_data (abfd);
+
+      /* Function symbols do not count.  */
+      if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
+	return FALSE;
+
+      /* If the symbol is defined in the common section, then
+	 it is a common definition and so does not count.  */
+      if (bed->common_definition (sym))
+	return FALSE;
+    }
 
   /* If the symbol is in a target specific section then we
      must rely upon the backend to tell us what it is.  */
@@ -3374,9 +3409,12 @@ is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
 
 /* Search the symbol table of the archive element of the archive ABFD
    whose archive map contains a mention of SYMDEF, and determine if
-   the symbol is defined in this element.  */
+   the symbol is defined in this element.  Igore seconday defintion,
+   it IGNORE_SECONDARY is TRUE.  */
+
 static bfd_boolean
-elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
+elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef,
+				    bfd_boolean ignore_secondary)
 {
   Elf_Internal_Shdr * hdr;
   size_t symcount;
@@ -3451,7 +3489,8 @@ elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
 
       if (strcmp (name, symdef->name) == 0)
 	{
-	  result = is_global_data_symbol_definition (abfd, isym);
+	  result = is_global_symbol_definition (abfd, isym,
+						ignore_secondary);
 	  break;
 	}
     }
@@ -4464,6 +4503,7 @@ elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
       unsigned int shindex;
       bfd *old_bfd;
       bfd_boolean matched;
+      bfd_boolean oldsecondary;
 
       override = FALSE;
 
@@ -4516,6 +4556,10 @@ elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
 	  flags = BSF_WEAK;
 	  break;
 
+	case STB_SECONDARY:
+	  flags = BSF_SECONDARY;
+	  break;
+
 	case STB_GNU_UNIQUE:
 	  flags = BSF_GNU_UNIQUE;
 	  break;
@@ -4759,7 +4803,7 @@ elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
 			      | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
 
 	  if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
-				      sym_hash, &old_bfd, &old_weak,
+				      sym_hash, FALSE, &old_bfd, &old_weak,
 				      &old_alignment, &skip, &override,
 				      &type_change_ok, &size_change_ok,
 				      &matched))
@@ -4782,7 +4826,12 @@ elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
 	      && vernum > 1
 	      && definition)
 	    h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
+
+	  /* Remember if the old definition is secondary.  */
+	  oldsecondary = h->root.secondary != 0;
 	}
+      else
+	oldsecondary = FALSE;
 
       if (! (_bfd_generic_link_add_one_symbol
 	     (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
@@ -4865,10 +4914,14 @@ elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
 	      if (! definition)
 		{
 		  h->ref_regular = 1;
-		  if (bind != STB_WEAK)
+		  /* Treat secondary symbols as weak symbols.  */
+		  if (bind != STB_WEAK && bind != STB_SECONDARY)
 		    h->ref_regular_nonweak = 1;
 		}
-	      else
+	      /* Mark it defined in a regular object if it is a
+		 non-secondary definition or it hasn't been defined
+		 in a dynamic object.  */
+	      else if (!h->def_dynamic || bind != STB_SECONDARY)
 		{
 		  h->def_regular = 1;
 		  if (h->def_dynamic)
@@ -4897,6 +4950,13 @@ elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
 		{
 		  h->def_dynamic = 1;
 		  hi->def_dynamic = 1;
+		  /* Dynamic definition overrides regular old secondary
+		     definition.  */
+		  if (oldsecondary)
+		    {
+		      h->def_regular = 0;
+		      hi->def_regular = 0;
+		    }
 		}
 
 	      /* If the indirect symbol has been forced local, don't
@@ -4914,7 +4974,8 @@ elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
 	  if (definition
 	      || (!override && h->root.type == bfd_link_hash_common))
 	    if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
-					      sec, value, &old_bfd, &dynsym))
+					      sec, value, oldsecondary,
+					      &old_bfd, &dynsym))
 	      goto error_free_vers;
 
 	  /* Check the alignment when a common symbol is involved. This
@@ -5736,16 +5797,27 @@ elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
 		 map alone.  Instead we must read in the element's symbol
 		 table and check that to see what kind of symbol definition
 		 this is.  */
-	      if (! elf_link_is_defined_archive_symbol (abfd, symdef))
+	      if (! elf_link_is_defined_archive_symbol (abfd, symdef,
+							FALSE))
 		continue;
 	    }
-	  else if (h->root.type != bfd_link_hash_undefined)
+	  /* Keep searching if a definition is secondary.  */
+	  else if (h->root.type != bfd_link_hash_undefined
+		   && !h->root.secondary)
 	    {
 	      if (h->root.type != bfd_link_hash_undefweak)
 		/* Symbol must be defined.  Don't check it again.  */
 		included[i] = TRUE;
 	      continue;
 	    }
+	  else if (h->root.secondary
+		   && h->root.type == bfd_link_hash_defweak)
+	    {
+	      /* Ignore another secondary definition.  */
+	      if (! elf_link_is_defined_archive_symbol (abfd, symdef,
+							TRUE))
+		continue;
+	    }
 
 	  /* We need to include this archive member.  */
 	  element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
@@ -10088,7 +10160,21 @@ elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
     sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, type);
   else if (h->root.type == bfd_link_hash_undefweak
 	   || h->root.type == bfd_link_hash_defweak)
-    sym.st_info = ELF_ST_INFO (STB_WEAK, type);
+    {
+      /* Generate defined secondary symbols for "ld -shared -z secondary"
+	 and "ld -r".  For undefined secondary symbols, we convert them
+	 to weak symbols.  We also convert defined secondary symbols in
+	 executables to weak symbols since their bindings in executables
+	 are final and can't be changed.  */
+      if ((bfd_link_relocatable (flinfo->info)
+	   || (!bfd_link_executable (flinfo->info)
+	       && flinfo->info->emit_secondary))
+	  && h->root.type == bfd_link_hash_defweak
+	  && h->root.secondary)
+	  sym.st_info = ELF_ST_INFO (STB_SECONDARY, type);
+	else
+	  sym.st_info = ELF_ST_INFO (STB_WEAK, type);
+    }
   else
     sym.st_info = ELF_ST_INFO (STB_GLOBAL, type);
   sym.st_target_internal = h->target_internal;
@@ -10126,7 +10212,8 @@ elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
   if (sym.st_shndx == SHN_UNDEF
       && h->ref_regular
       && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
-	  || ELF_ST_BIND (sym.st_info) == STB_WEAK))
+	  || ELF_ST_BIND (sym.st_info) == STB_WEAK
+	  || ELF_ST_BIND (sym.st_info) == STB_SECONDARY))
     {
       int bindtype;
       type = ELF_ST_TYPE (sym.st_info);
@@ -10152,10 +10239,12 @@ elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
     sym.st_size = 0;
 
   /* If a non-weak symbol with non-default visibility is not defined
-     locally, it is a fatal error.  */
+     locally, it is a fatal error.  Treat secondary symbols as weak
+     symbols.  */
   if (!bfd_link_relocatable (flinfo->info)
       && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
       && ELF_ST_BIND (sym.st_info) != STB_WEAK
+      && ELF_ST_BIND (sym.st_info) != STB_SECONDARY
       && h->root.type == bfd_link_hash_undefined
       && !h->def_regular)
     {
diff --git a/bfd/elfn32-mips.c b/bfd/elfn32-mips.c
index 71242a55404..fd2d8ad0dfc 100644
--- a/bfd/elfn32-mips.c
+++ b/bfd/elfn32-mips.c
@@ -3840,7 +3840,10 @@ mips_elf_sym_is_global (bfd *abfd ATTRIBUTE_UNUSED, asymbol *sym)
   if (SGI_COMPAT (abfd))
     return (sym->flags & BSF_SECTION_SYM) == 0;
   else
-    return ((sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) != 0
+    return ((sym->flags & (BSF_GLOBAL
+			   | BSF_WEAK
+			   | BSF_SECONDARY
+			   | BSF_GNU_UNIQUE)) != 0
 	    || bfd_is_und_section (bfd_asymbol_section (sym))
 	    || bfd_is_com_section (bfd_asymbol_section (sym)));
 }
diff --git a/bfd/linker.c b/bfd/linker.c
index c523f8b5c64..141fcbec813 100644
--- a/bfd/linker.c
+++ b/bfd/linker.c
@@ -1389,6 +1389,7 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
   struct bfd_link_hash_entry *h;
   struct bfd_link_hash_entry *inh = NULL;
   bfd_boolean cycle;
+  unsigned int secondary;
 
   BFD_ASSERT (section != NULL);
 
@@ -1455,6 +1456,24 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
 	return FALSE;
     }
 
+  /* Since secondary symbols have lower precedence than weak symbols,
+     we treat them as weak symbols here.  */
+  secondary = (flags & BSF_SECONDARY) != 0;
+  if (secondary)
+    switch (row)
+      {
+      default:
+	break;
+
+      case UNDEF_ROW:
+	row = UNDEFW_ROW;
+	break;
+
+      case DEF_ROW:
+	row = DEFW_ROW;
+	break;
+      }
+
   if (hashp != NULL)
     *hashp = h;
 
@@ -1467,6 +1486,24 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
       /* Treat symbols defined by early linker script pass as undefined.  */
       if (h->ldscript_def)
 	prev = bfd_link_hash_undefined;
+      /* Convert a secondary symbol to a weak symbol.  Backend is
+	 responsible to let a weak symbol override a secondary
+	 symbol. */
+      else if (h->secondary)
+	switch (prev)
+	  {
+	  default:
+	    break;
+
+	  case bfd_link_hash_undefined:
+	    prev = bfd_link_hash_undefweak;
+	    break;
+
+	  case bfd_link_hash_defined:
+	    prev = bfd_link_hash_defweak;
+	    break;
+	  }
+
       cycle = FALSE;
       action = link_action[(int) row][prev];
       switch (action)
@@ -1514,6 +1551,9 @@ _bfd_generic_link_add_one_symbol (struct bfd_link_info *info,
 	    h->linker_def = 0;
 	    h->ldscript_def = 0;
 
+	    /* Mark if this is a secondary symbol.  */
+	    h->secondary = secondary;
+
 	    /* If we have been asked to, we act like collect2 and
 	       identify all functions that might be global
 	       constructors and destructors and pass them up in a
diff --git a/bfd/syms.c b/bfd/syms.c
index 76c212344eb..f4d8a47d291 100644
--- a/bfd/syms.c
+++ b/bfd/syms.c
@@ -307,6 +307,10 @@ CODE_FRAGMENT
 .     with this name and type in use.  BSF_OBJECT must also be set.  *}
 .#define BSF_GNU_UNIQUE          (1 << 23)
 .
+.  {* A secondary global symbol, overridable without warnings by
+.     a regular or weak global symbol of the same name.  *}
+.#define BSF_SECONDARY		(1 << 24)
+.
 .  flagword flags;
 .
 .  {* A pointer to the section to which this symbol is
@@ -490,6 +494,7 @@ bfd_print_symbol_vandf (bfd *abfd, void *arg, asymbol *symbol)
 	   ((type & BSF_LOCAL)
 	    ? (type & BSF_GLOBAL) ? '!' : 'l'
 	    : (type & BSF_GLOBAL) ? 'g'
+	    : (type & BSF_SECONDARY) ? 's'
 	    : (type & BSF_GNU_UNIQUE) ? 'u' : ' '),
 	   (type & BSF_WEAK) ? 'w' : ' ',
 	   (type & BSF_CONSTRUCTOR) ? 'C' : ' ',
@@ -687,6 +692,15 @@ bfd_decode_symclass (asymbol *symbol)
     }
   if (symbol->flags & BSF_GNU_UNIQUE)
     return 'u';
+  if (symbol->flags & BSF_SECONDARY)
+    {
+      /* If secondary, determine if it's specifically an object
+	 or non-object weak.  */
+      if (symbol->flags & BSF_OBJECT)
+	return 'Y';
+      else
+	return 'S';
+    }
   if (!(symbol->flags & (BSF_GLOBAL | BSF_LOCAL)))
     return '?';
 
diff --git a/binutils/nm.c b/binutils/nm.c
index 1b5122d56ab..6bfaa2ac9a3 100644
--- a/binutils/nm.c
+++ b/binutils/nm.c
@@ -502,6 +502,7 @@ filter_symbols (bfd *abfd, bfd_boolean is_dynamic, void *minisyms,
 	/* PR binutls/12753: Unique symbols are global too.  */
 	keep = ((sym->flags & (BSF_GLOBAL
 			       | BSF_WEAK
+			       | BSF_SECONDARY
 			       | BSF_GNU_UNIQUE)) != 0
 		|| bfd_is_und_section (sym->section)
 		|| bfd_is_com_section (sym->section));
diff --git a/binutils/readelf.c b/binutils/readelf.c
index eb41e10dae9..4b6ce39f69d 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -11133,6 +11133,7 @@ get_symbol_binding (Filedata * filedata, unsigned int binding)
     case STB_LOCAL:	return "LOCAL";
     case STB_GLOBAL:	return "GLOBAL";
     case STB_WEAK:	return "WEAK";
+    case STB_SECONDARY:	return "SECOND";
     default:
       if (binding >= STB_LOPROC && binding <= STB_HIPROC)
 	snprintf (buff, sizeof (buff), _("<processor specific>: %d"),
diff --git a/gas/config/obj-elf.c b/gas/config/obj-elf.c
index f3f7fc5cb78..9a3c5c6d84a 100644
--- a/gas/config/obj-elf.c
+++ b/gas/config/obj-elf.c
@@ -68,6 +68,7 @@ static void obj_elf_line (int);
 static void obj_elf_size (int);
 static void obj_elf_type (int);
 static void obj_elf_ident (int);
+static void obj_elf_secondary (int);
 static void obj_elf_weak (int);
 static void obj_elf_local (int);
 static void obj_elf_visibility (int);
@@ -97,6 +98,7 @@ static const pseudo_typeS elf_pseudo_table[] =
   {"type", obj_elf_type, 0},
   {"version", obj_elf_version, 0},
   {"weak", obj_elf_weak, 0},
+  {"secondary", obj_elf_secondary, 0},
 
   /* These define symbol visibility.  */
   {"internal", obj_elf_visibility, STV_INTERNAL},
@@ -447,6 +449,29 @@ obj_elf_local (int ignore ATTRIBUTE_UNUSED)
   demand_empty_rest_of_line ();
 }
 
+static void
+obj_elf_secondary (int ignore ATTRIBUTE_UNUSED)
+{
+  int c;
+  symbolS *symbolP;
+
+  do
+    {
+      symbolP = get_sym_from_input_line_and_check ();
+      c = *input_line_pointer;
+      S_SET_SECONDARY (symbolP);
+      if (c == ',')
+	{
+	  input_line_pointer++;
+	  SKIP_WHITESPACE ();
+	  if (*input_line_pointer == '\n')
+	    c = '\n';
+	}
+    }
+  while (c == ',');
+  demand_empty_rest_of_line ();
+}
+
 static void
 obj_elf_weak (int ignore ATTRIBUTE_UNUSED)
 {
@@ -457,7 +482,8 @@ obj_elf_weak (int ignore ATTRIBUTE_UNUSED)
     {
       symbolP = get_sym_from_input_line_and_check ();
       c = *input_line_pointer;
-      S_SET_WEAK (symbolP);
+      if (!S_IS_SECONDARY (symbolP))
+	S_SET_WEAK (symbolP);
       if (c == ',')
 	{
 	  input_line_pointer++;
@@ -2549,6 +2575,9 @@ elf_frob_symbol (symbolS *symp, int *puntp)
 	      if (S_IS_WEAK (symp))
 		S_SET_WEAK (symp2);
 
+	      if (S_IS_SECONDARY (symp))
+		S_SET_SECONDARY (symp2);
+
 	      if (S_IS_EXTERNAL (symp))
 		S_SET_EXTERNAL (symp2);
 	    }
@@ -2576,12 +2605,15 @@ elf_frob_symbol (symbolS *symp, int *puntp)
 	}
     }
 
-  /* Double check weak symbols.  */
-  if (S_IS_WEAK (symp))
+  /* Double check weak and secondary symbols.  */
+  if (S_IS_COMMON (symp))
     {
-      if (S_IS_COMMON (symp))
+      if (S_IS_WEAK (symp))
 	as_bad (_("symbol `%s' can not be both weak and common"),
 		S_GET_NAME (symp));
+      else if (S_IS_SECONDARY (symp))
+	as_bad (_("symbol `%s' can not be both secondary and common"),
+		S_GET_NAME (symp));
     }
 }
 
@@ -2801,7 +2833,9 @@ elf_frob_file_before_adjust (void)
 	  /* If there was .symver or .weak, but symbol was neither
 	     defined nor used anywhere, remove it.  */
 	  if (!is_defined
-	      && (sy_obj->versioned_name || S_IS_WEAK (symp))
+	      && (sy_obj->versioned_name
+		  || S_IS_WEAK (symp)
+		  || S_IS_SECONDARY (symp))
 	      && symbol_used_p (symp) == 0
 	      && symbol_used_in_reloc_p (symp) == 0)
 	    symbol_remove (symp, &symbol_rootP, &symbol_lastP);
diff --git a/gas/doc/as.texi b/gas/doc/as.texi
index 8669879c87f..e56f7d2906d 100644
--- a/gas/doc/as.texi
+++ b/gas/doc/as.texi
@@ -4468,6 +4468,7 @@ Some machine configurations provide additional directives.
 * Print::			@code{.print @var{string}}
 @ifset ELF
 * Protected::                   @code{.protected @var{names}}
+* Secondary::                   @code{.secondary @var{names}}
 @end ifset
 
 * Psize::                       @code{.psize @var{lines}, @var{columns}}
@@ -6367,6 +6368,14 @@ their binding: local, global or weak).  The directive sets the visibility to
 components that defines them must be resolved to the definition in that
 component, even if a definition in another component would normally preempt
 this.
+
+@node Secondary
+@section @code{.secondary @var{names}}
+
+@cindex @code{secondary} directive
+This directive sets the secondary attribute on the comma separated list
+of symbol @code{names}.  If the symbols do not already exist, they will
+be created.
 @end ifset
 
 @node Psize
diff --git a/gas/symbols.c b/gas/symbols.c
index 160b0f74021..386fc079d67 100644
--- a/gas/symbols.c
+++ b/gas/symbols.c
@@ -2228,6 +2228,14 @@ S_IS_WEAK (symbolS *s)
   return (s->bsym->flags & BSF_WEAK) != 0;
 }
 
+int
+S_IS_SECONDARY (symbolS *s)
+{
+  if (LOCAL_SYMBOL_CHECK (s))
+    return 0;
+  return (s->bsym->flags & BSF_SECONDARY) != 0;
+}
+
 int
 S_IS_WEAKREFR (symbolS *s)
 {
@@ -2277,7 +2285,7 @@ S_FORCE_RELOC (symbolS *s, int strict)
   else
     {
       if ((strict
-	   && ((s->bsym->flags & BSF_WEAK) != 0
+	   && ((s->bsym->flags & (BSF_WEAK | BSF_SECONDARY)) != 0
 	       || (EXTERN_FORCE_RELOC
 		   && (s->bsym->flags & BSF_GLOBAL) != 0)))
 	  || (s->bsym->flags & BSF_GNU_INDIRECT_FUNCTION) != 0)
@@ -2418,9 +2426,9 @@ S_SET_EXTERNAL (symbolS *s)
 {
   if (LOCAL_SYMBOL_CHECK (s))
     s = local_symbol_convert ((struct local_symbol *) s);
-  if ((s->bsym->flags & BSF_WEAK) != 0)
+  if ((s->bsym->flags & (BSF_WEAK | BSF_SECONDARY)) != 0)
     {
-      /* Let .weak override .global.  */
+      /* Let .weak/.secondary override .global.  */
       return;
     }
   if (s->bsym->flags & BSF_SECTION_SYM)
@@ -2438,7 +2446,7 @@ S_SET_EXTERNAL (symbolS *s)
     }
 #endif
   s->bsym->flags |= BSF_GLOBAL;
-  s->bsym->flags &= ~(BSF_LOCAL | BSF_WEAK);
+  s->bsym->flags &= ~(BSF_LOCAL | BSF_WEAK | BSF_SECONDARY);
 
 #ifdef TE_PE
   if (! an_external_name && S_GET_NAME(s)[0] != '.')
@@ -2451,13 +2459,13 @@ S_CLEAR_EXTERNAL (symbolS *s)
 {
   if (LOCAL_SYMBOL_CHECK (s))
     return;
-  if ((s->bsym->flags & BSF_WEAK) != 0)
+  if ((s->bsym->flags & (BSF_WEAK | BSF_SECONDARY)) != 0)
     {
-      /* Let .weak override.  */
+      /* Let .weak/.secondary override.  */
       return;
     }
   s->bsym->flags |= BSF_LOCAL;
-  s->bsym->flags &= ~(BSF_GLOBAL | BSF_WEAK);
+  s->bsym->flags &= ~(BSF_GLOBAL | BSF_WEAK | BSF_SECONDARY);
 }
 
 void
@@ -2469,7 +2477,16 @@ S_SET_WEAK (symbolS *s)
   obj_set_weak_hook (s);
 #endif
   s->bsym->flags |= BSF_WEAK;
-  s->bsym->flags &= ~(BSF_GLOBAL | BSF_LOCAL);
+  s->bsym->flags &= ~(BSF_GLOBAL | BSF_SECONDARY | BSF_LOCAL);
+}
+
+void
+S_SET_SECONDARY (symbolS *s)
+{
+  if (LOCAL_SYMBOL_CHECK (s))
+    s = local_symbol_convert ((struct local_symbol *) s);
+  s->bsym->flags |= BSF_SECONDARY;
+  s->bsym->flags &= ~(BSF_GLOBAL | BSF_WEAK | BSF_LOCAL);
 }
 
 void
@@ -2526,6 +2543,12 @@ S_CLEAR_WEAKREFD (symbolS *s)
 	  s->bsym->flags &= ~BSF_WEAK;
 	  s->bsym->flags |= BSF_LOCAL;
 	}
+      /* The same applies to secondary symbol.  */
+      else if (s->bsym->flags & BSF_SECONDARY)
+	{
+	  s->bsym->flags &= ~BSF_SECONDARY;
+	  s->bsym->flags |= BSF_LOCAL;
+	}
     }
 }
 
diff --git a/gas/symbols.h b/gas/symbols.h
index dafd677b9e1..c1b12882b9a 100644
--- a/gas/symbols.h
+++ b/gas/symbols.h
@@ -92,6 +92,7 @@ extern void S_SET_VALUE (symbolS *, valueT);
 extern int S_IS_FUNCTION (symbolS *);
 extern int S_IS_EXTERNAL (symbolS *);
 extern int S_IS_WEAK (symbolS *);
+extern int S_IS_SECONDARY (symbolS *);
 extern int S_IS_WEAKREFR (symbolS *);
 extern int S_IS_WEAKREFD (symbolS *);
 extern int S_IS_COMMON (symbolS *);
@@ -110,6 +111,7 @@ extern void S_SET_EXTERNAL (symbolS *);
 extern void S_SET_NAME (symbolS *, const char *);
 extern void S_CLEAR_EXTERNAL (symbolS *);
 extern void S_SET_WEAK (symbolS *);
+extern void S_SET_SECONDARY (symbolS *);
 extern void S_SET_WEAKREFR (symbolS *);
 extern void S_CLEAR_WEAKREFR (symbolS *);
 extern void S_SET_WEAKREFD (symbolS *);
diff --git a/gas/testsuite/gas/elf/common6.d b/gas/testsuite/gas/elf/common6.d
new file mode 100644
index 00000000000..31ca43df9d8
--- /dev/null
+++ b/gas/testsuite/gas/elf/common6.d
@@ -0,0 +1,2 @@
+#name: common and secondary directives
+#error_output: common6.l
diff --git a/gas/testsuite/gas/elf/common6.l b/gas/testsuite/gas/elf/common6.l
new file mode 100644
index 00000000000..58d5142fc81
--- /dev/null
+++ b/gas/testsuite/gas/elf/common6.l
@@ -0,0 +1,2 @@
+[^:]*: Assembler messages:
+[^:]*: Error: symbol `foobar' can not be both secondary and common
diff --git a/gas/testsuite/gas/elf/common6.s b/gas/testsuite/gas/elf/common6.s
new file mode 100644
index 00000000000..37bd0ce2c05
--- /dev/null
+++ b/gas/testsuite/gas/elf/common6.s
@@ -0,0 +1,2 @@
+	.comm foobar,30
+	.secondary foobar
diff --git a/gas/testsuite/gas/elf/common7.d b/gas/testsuite/gas/elf/common7.d
new file mode 100644
index 00000000000..124a151e533
--- /dev/null
+++ b/gas/testsuite/gas/elf/common7.d
@@ -0,0 +1,2 @@
+#name: secondary and common directives
+#error_output: common7.l
diff --git a/gas/testsuite/gas/elf/common7.l b/gas/testsuite/gas/elf/common7.l
new file mode 100644
index 00000000000..58d5142fc81
--- /dev/null
+++ b/gas/testsuite/gas/elf/common7.l
@@ -0,0 +1,2 @@
+[^:]*: Assembler messages:
+[^:]*: Error: symbol `foobar' can not be both secondary and common
diff --git a/gas/testsuite/gas/elf/common7.s b/gas/testsuite/gas/elf/common7.s
new file mode 100644
index 00000000000..df8b7ed7f5c
--- /dev/null
+++ b/gas/testsuite/gas/elf/common7.s
@@ -0,0 +1,2 @@
+	.secondary foobar
+	.comm foobar,30
diff --git a/gas/testsuite/gas/elf/elf.exp b/gas/testsuite/gas/elf/elf.exp
index c80175cc51d..e52f76e3656 100644
--- a/gas/testsuite/gas/elf/elf.exp
+++ b/gas/testsuite/gas/elf/elf.exp
@@ -296,8 +296,13 @@ if { [is_elf_format] } then {
 	run_dump_test "common5b"
 	run_dump_test "common5c"
 	run_dump_test "common5d"
+	run_dump_test "common6"
+	run_dump_test "common7"
     }
 
+    run_elf_list_test "secondary1" "" "" "-s" "| grep \"secondary_\""
+    run_elf_list_test "secondary2" "" "" "-s" "| grep \"secondary_\""
+
     run_dump_test "strtab"
 
     run_dump_test "bignums"
diff --git a/gas/testsuite/gas/elf/secondary1.e b/gas/testsuite/gas/elf/secondary1.e
new file mode 100644
index 00000000000..da00dfb9859
--- /dev/null
+++ b/gas/testsuite/gas/elf/secondary1.e
@@ -0,0 +1,4 @@
+ +.: 0+0 +1 +FUNC +SECOND +DEFAULT +. secondary_function1
+ +.: 0+1 +1 +FUNC +SECOND +DEFAULT +. secondary_function2
+ +.: 0+0 +1 +OBJECT +SECOND +DEFAULT +. secondary_object1
+ +.: 0+1 +1 +OBJECT +SECOND +DEFAULT +. secondary_object2
diff --git a/gas/testsuite/gas/elf/secondary1.s b/gas/testsuite/gas/elf/secondary1.s
new file mode 100644
index 00000000000..6a3032dacd2
--- /dev/null
+++ b/gas/testsuite/gas/elf/secondary1.s
@@ -0,0 +1,33 @@
+	.text
+
+        .size   secondary_function1,1
+	.secondary secondary_function1
+	.weak	secondary_function1
+        .type   secondary_function1,%function
+secondary_function1:
+	.byte	0x0
+        .size   secondary_function1,1
+	
+        .size   secondary_function2,1
+	.weak	secondary_function2
+	.secondary secondary_function2
+        .type   secondary_function2,%function
+secondary_function2:
+	.byte	0x0
+        .size   secondary_function2,1
+	
+
+        .data
+        .type   secondary_object1,%object
+	.weak	secondary_object1
+	.secondary secondary_object1
+secondary_object1:
+	.byte	0x0
+        .size   secondary_object1,1
+
+        .type   secondary_object2,%object
+	.weak	secondary_object2
+	.secondary secondary_object2
+secondary_object2:
+	.byte	0x0
+        .size   secondary_object2,1
diff --git a/gas/testsuite/gas/elf/secondary2.e b/gas/testsuite/gas/elf/secondary2.e
new file mode 100644
index 00000000000..0470eb82405
--- /dev/null
+++ b/gas/testsuite/gas/elf/secondary2.e
@@ -0,0 +1 @@
+ +.: 0+ +0 +[A-Z]+ +WEAK +DEFAULT +UND secondary_function
diff --git a/gas/testsuite/gas/elf/secondary2.s b/gas/testsuite/gas/elf/secondary2.s
new file mode 100644
index 00000000000..234330ab992
--- /dev/null
+++ b/gas/testsuite/gas/elf/secondary2.s
@@ -0,0 +1,5 @@
+	.text
+	.secondary secondary_function
+	.dc.a secondary_function
+	.data
+	.secondary secondary_object
diff --git a/gas/testsuite/gas/elf/type.e b/gas/testsuite/gas/elf/type.e
index a1159bf4fbc..d4c0548b860 100644
--- a/gas/testsuite/gas/elf/type.e
+++ b/gas/testsuite/gas/elf/type.e
@@ -3,5 +3,7 @@
  +.+: 0+0 +1 +OBJECT +LOCAL +DEFAULT +. object
  +.+: 0+1 +1 +TLS +LOCAL +DEFAULT +. tls_object
  +.+: 0+2 +1 +NOTYPE +LOCAL +DEFAULT +. notype
+ +.+: 0+2 +1 +FUNC +SECOND +DEFAULT +. secondary_function
  +.+: 0+3 +1 +OBJECT +UNIQUE +DEFAULT +. unique_global
+ +.+: 0+4 +1 +OBJECT +SECOND +DEFAULT +. secondary_object
  +.+: 0+1 +1 +(COMMON|OBJECT) +GLOBAL +DEFAULT +COM common
diff --git a/gas/testsuite/gas/elf/type.s b/gas/testsuite/gas/elf/type.s
index d0a1afd2fa0..bd7df2cb964 100644
--- a/gas/testsuite/gas/elf/type.s
+++ b/gas/testsuite/gas/elf/type.s
@@ -10,6 +10,12 @@ function:
 indirect_function:
 	.byte	0x0
 	
+        .size   secondary_function,1
+	.secondary secondary_function
+        .type   secondary_function,%function
+secondary_function:
+	.byte	0x0
+	
         .data
 	
         .type   object,%object
@@ -32,6 +38,11 @@ unique_global:
 	.byte	0x0
 	.size	unique_global,1
 
+        .type   secondary_object,%object
+	.secondary secondary_object
+secondary_object:
+	.byte	0x0
+        .size   secondary_object,1
+
 	.comm	common, 1
 	.type   common,STT_COMMON
-	
\ No newline at end of file
diff --git a/include/bfdlink.h b/include/bfdlink.h
index 84b9dd7a0a0..671788f51a8 100644
--- a/include/bfdlink.h
+++ b/include/bfdlink.h
@@ -126,6 +126,9 @@ struct bfd_link_hash_entry
      outside of an output section statement.  */
   unsigned int rel_from_abs : 1;
 
+  /* Set if it is a secondary symbol.  */
+  unsigned int secondary : 1;
+
   /* A union of information depending upon the type.  */
   union
     {
@@ -420,6 +423,9 @@ struct bfd_link_info
   /* TRUE if .gnu.hash section should be created.  */
   unsigned int emit_gnu_hash: 1;
 
+  /* TRUE if secondary symbols should be generated.  */
+  unsigned int emit_secondary: 1;
+
   /* If TRUE reduce memory overheads, at the expense of speed. This will
      cause map file generation to use an O(N^2) algorithm and disable
      caching ELF symbol buffer.  */
diff --git a/include/elf/common.h b/include/elf/common.h
index 6741c34a007..aeaaea9dd37 100644
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -905,6 +905,7 @@
 #define STB_LOCAL	0		/* Symbol not visible outside obj */
 #define STB_GLOBAL	1		/* Symbol visible outside obj */
 #define STB_WEAK	2		/* Like globals, lower precedence */
+#define STB_SECONDARY	3		/* Like weaks, lower precedence */
 #define STB_LOOS	10		/* OS-specific semantics */
 #define STB_GNU_UNIQUE	10		/* Symbol is unique in namespace */
 #define STB_HIOS	12		/* OS-specific semantics */
diff --git a/ld/emultempl/elf.em b/ld/emultempl/elf.em
index bb7e5375303..ed2fd3d5445 100644
--- a/ld/emultempl/elf.em
+++ b/ld/emultempl/elf.em
@@ -811,6 +811,8 @@ fragment <<EOF
 	link_info.error_textrel = FALSE;
       else if (strcmp (optarg, "textoff") == 0)
 	link_info.error_textrel = FALSE;
+      else if (strcmp (optarg, "nosecondary") == 0)
+	link_info.emit_secondary = FALSE;
 EOF
 fi
 
diff --git a/ld/ld.texi b/ld/ld.texi
index 9f562935bed..d579da63b77 100644
--- a/ld/ld.texi
+++ b/ld/ld.texi
@@ -1280,6 +1280,10 @@ Lazy binding is the default.
 @item loadfltr
 Specify that the object's filters be processed immediately at runtime.
 
+@item nosecondary
+Convert secondary symbols to weak symbols when generating a shared
+library.
+
 @item max-page-size=@var{value}
 Set the maximum memory page size supported to @var{value}.
 
diff --git a/ld/ldmain.c b/ld/ldmain.c
index c4af10f4e91..e15f2c5cfb6 100644
--- a/ld/ldmain.c
+++ b/ld/ldmain.c
@@ -288,6 +288,7 @@ main (int argc, char **argv)
   link_info.prohibit_multiple_definition_absolute = FALSE;
   link_info.emit_hash = DEFAULT_EMIT_SYSV_HASH;
   link_info.emit_gnu_hash = DEFAULT_EMIT_GNU_HASH;
+  link_info.emit_secondary = TRUE;
   link_info.callbacks = &link_callbacks;
   link_info.input_bfds_tail = &link_info.input_bfds;
   /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
diff --git a/ld/lexsup.c b/ld/lexsup.c
index 2597e2d6304..38a7bb56b2d 100644
--- a/ld/lexsup.c
+++ b/ld/lexsup.c
@@ -1851,6 +1851,8 @@ elf_shlib_list_options (FILE *file)
   fprintf (file, _("\
   -z nocommon                 Generate common symbols with STT_OBJECT type\n"));
   fprintf (file, _("\
+  -z nosecondary              Convert secondary symbols to weak symbols\n"));
+  fprintf (file, _("\
   -z stack-size=SIZE          Set size of stack segment\n"));
   fprintf (file, _("\
   -z text                     Treat DT_TEXTREL in shared object as error\n"));
diff --git a/ld/testsuite/ld-elf/library1.c b/ld/testsuite/ld-elf/library1.c
new file mode 100644
index 00000000000..28e255d318f
--- /dev/null
+++ b/ld/testsuite/ld-elf/library1.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+void
+bar (void)
+{
+#ifdef SHARED
+  printf ("library bar (SHARED)\n");
+#else
+  printf ("library bar\n");
+#endif
+}
diff --git a/ld/testsuite/ld-elf/library1.out b/ld/testsuite/ld-elf/library1.out
new file mode 100644
index 00000000000..2050e746e5a
--- /dev/null
+++ b/ld/testsuite/ld-elf/library1.out
@@ -0,0 +1 @@
+library bar
diff --git a/ld/testsuite/ld-elf/library2.c b/ld/testsuite/ld-elf/library2.c
new file mode 100644
index 00000000000..271ebd6ef1a
--- /dev/null
+++ b/ld/testsuite/ld-elf/library2.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+void
+__attribute__((weak))
+bar (void)
+{
+#ifdef SHARED
+  printf ("weak library bar (SHARED)\n");
+#else
+  printf ("weak library bar\n");
+#endif
+}
diff --git a/ld/testsuite/ld-elf/library2.out b/ld/testsuite/ld-elf/library2.out
new file mode 100644
index 00000000000..ddd3d10e794
--- /dev/null
+++ b/ld/testsuite/ld-elf/library2.out
@@ -0,0 +1 @@
+weak library bar
diff --git a/ld/testsuite/ld-elf/library3.out b/ld/testsuite/ld-elf/library3.out
new file mode 100644
index 00000000000..881856e6639
--- /dev/null
+++ b/ld/testsuite/ld-elf/library3.out
@@ -0,0 +1 @@
+library bar (SHARED)
diff --git a/ld/testsuite/ld-elf/library4.out b/ld/testsuite/ld-elf/library4.out
new file mode 100644
index 00000000000..1ff18403d51
--- /dev/null
+++ b/ld/testsuite/ld-elf/library4.out
@@ -0,0 +1 @@
+weak library bar (SHARED)
diff --git a/ld/testsuite/ld-elf/library5a.c b/ld/testsuite/ld-elf/library5a.c
new file mode 100644
index 00000000000..7e44bb4b578
--- /dev/null
+++ b/ld/testsuite/ld-elf/library5a.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+asm (".secondary bar");
+asm (".weak bar");
+
+void
+bar (void)
+{
+  printf ("secondary bar\n");
+}
+
+void
+xxx (void)
+{
+  printf ("xxx\n");
+}
diff --git a/ld/testsuite/ld-elf/library5b.c b/ld/testsuite/ld-elf/library5b.c
new file mode 100644
index 00000000000..f44d97c2ad8
--- /dev/null
+++ b/ld/testsuite/ld-elf/library5b.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+extern void bar (void);
+
+void
+foo (void)
+{
+  printf ("foo\n");
+  bar ();
+}
diff --git a/ld/testsuite/ld-elf/library6a.c b/ld/testsuite/ld-elf/library6a.c
new file mode 100644
index 00000000000..7de81b31a47
--- /dev/null
+++ b/ld/testsuite/ld-elf/library6a.c
@@ -0,0 +1,4 @@
+void
+bar (void)
+{
+}
diff --git a/ld/testsuite/ld-elf/library6b.c b/ld/testsuite/ld-elf/library6b.c
new file mode 100644
index 00000000000..528fd893305
--- /dev/null
+++ b/ld/testsuite/ld-elf/library6b.c
@@ -0,0 +1,7 @@
+extern void bar (void);
+
+void
+xxx (void)
+{
+  bar ();
+}
diff --git a/ld/testsuite/ld-elf/library6c.c b/ld/testsuite/ld-elf/library6c.c
new file mode 100644
index 00000000000..60f4b922ad4
--- /dev/null
+++ b/ld/testsuite/ld-elf/library6c.c
@@ -0,0 +1,9 @@
+extern void abort (void);
+
+asm (".secondary bar");
+
+void
+bar (void)
+{
+  abort ();
+}
diff --git a/ld/testsuite/ld-elf/library7a.c b/ld/testsuite/ld-elf/library7a.c
new file mode 100644
index 00000000000..10cd8bfee26
--- /dev/null
+++ b/ld/testsuite/ld-elf/library7a.c
@@ -0,0 +1 @@
+int bar;
diff --git a/ld/testsuite/ld-elf/library7b.c b/ld/testsuite/ld-elf/library7b.c
new file mode 100644
index 00000000000..5f67848a29f
--- /dev/null
+++ b/ld/testsuite/ld-elf/library7b.c
@@ -0,0 +1,7 @@
+extern int bar;
+
+int
+xxx (void)
+{
+  return bar;
+}
diff --git a/ld/testsuite/ld-elf/library7c.c b/ld/testsuite/ld-elf/library7c.c
new file mode 100644
index 00000000000..aa57fde8197
--- /dev/null
+++ b/ld/testsuite/ld-elf/library7c.c
@@ -0,0 +1,3 @@
+asm (".secondary bar");
+
+int bar = 3;
diff --git a/ld/testsuite/ld-elf/library8.map b/ld/testsuite/ld-elf/library8.map
new file mode 100644
index 00000000000..bcbb4dea890
--- /dev/null
+++ b/ld/testsuite/ld-elf/library8.map
@@ -0,0 +1,4 @@
+VERS_1 {
+  global: bar; _bar;
+  local: *;
+};
diff --git a/ld/testsuite/ld-elf/library8a.c b/ld/testsuite/ld-elf/library8a.c
new file mode 100644
index 00000000000..29a75087a02
--- /dev/null
+++ b/ld/testsuite/ld-elf/library8a.c
@@ -0,0 +1,10 @@
+#if 1
+asm (".secondary bar");
+#else
+asm (".weak bar");
+#endif
+
+void
+bar (void)
+{
+}
diff --git a/ld/testsuite/ld-elf/library8a.rd b/ld/testsuite/ld-elf/library8a.rd
new file mode 100644
index 00000000000..a593fbdc2cf
--- /dev/null
+++ b/ld/testsuite/ld-elf/library8a.rd
@@ -0,0 +1,5 @@
+Symbol table '\.dynsym' contains [0-9]+ entries:
+ +Num: +Value +Size Type +Bind +Vis +Ndx Name
+#...
+ +[0-9]+: +[0-9a-f]+ +[0-9a-f]+ +FUNC +SECOND +DEFAULT +[0-9]+ +_?bar@@VERS_1
+#...
diff --git a/ld/testsuite/ld-elf/library8b.c b/ld/testsuite/ld-elf/library8b.c
new file mode 100644
index 00000000000..7de81b31a47
--- /dev/null
+++ b/ld/testsuite/ld-elf/library8b.c
@@ -0,0 +1,4 @@
+void
+bar (void)
+{
+}
diff --git a/ld/testsuite/ld-elf/library8b.rd b/ld/testsuite/ld-elf/library8b.rd
new file mode 100644
index 00000000000..fc18d1ad625
--- /dev/null
+++ b/ld/testsuite/ld-elf/library8b.rd
@@ -0,0 +1,5 @@
+Symbol table '\.dynsym' contains [0-9]+ entries:
+ +Num: +Value +Size Type +Bind +Vis +Ndx Name
+#...
+ +[0-9]+: +[0-9a-f]+ +[0-9a-f]+ +FUNC +GLOBAL +DEFAULT +[0-9]+ +_?bar@@VERS_1
+#...
diff --git a/ld/testsuite/ld-elf/library8c.c b/ld/testsuite/ld-elf/library8c.c
new file mode 100644
index 00000000000..dfb6a22edb8
--- /dev/null
+++ b/ld/testsuite/ld-elf/library8c.c
@@ -0,0 +1,7 @@
+extern void bar ();
+
+void
+foo (void)
+{
+  bar ();
+}
diff --git a/ld/testsuite/ld-elf/library8c.rd b/ld/testsuite/ld-elf/library8c.rd
new file mode 100644
index 00000000000..e2e58f021bb
--- /dev/null
+++ b/ld/testsuite/ld-elf/library8c.rd
@@ -0,0 +1,5 @@
+Symbol table '\.dynsym' contains [0-9]+ entries:
+ +Num: +Value +Size Type +Bind +Vis +Ndx Name
+#...
+ +[0-9]+: +0+ +0+ +FUNC +GLOBAL +DEFAULT +UND +_?bar@VERS_1 +\([0-9]+\)
+#...
diff --git a/ld/testsuite/ld-elf/secondary-foo.c b/ld/testsuite/ld-elf/secondary-foo.c
new file mode 100644
index 00000000000..8b23ec8f2b7
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary-foo.c
@@ -0,0 +1,7 @@
+extern void bar (void);
+
+void
+foo (void)
+{
+  bar ();
+}
diff --git a/ld/testsuite/ld-elf/secondary-main.c b/ld/testsuite/ld-elf/secondary-main.c
new file mode 100644
index 00000000000..f1cb6b492bd
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary-main.c
@@ -0,0 +1,8 @@
+extern void foo (void);
+
+int
+main (void)
+{
+  foo ();
+  return 0;
+}
diff --git a/ld/testsuite/ld-elf/secondary.c b/ld/testsuite/ld-elf/secondary.c
new file mode 100644
index 00000000000..6d64ed7652e
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+asm (".secondary bar");
+
+void
+bar (void)
+{
+  printf ("secondary bar\n");
+}
diff --git a/ld/testsuite/ld-elf/secondary.exp b/ld/testsuite/ld-elf/secondary.exp
new file mode 100644
index 00000000000..63223326557
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary.exp
@@ -0,0 +1,186 @@
+# Expect script for ELF secondary symbol tests.
+#   Copyright 2012
+#   Free Software Foundation, Inc.
+#
+# This file is part of the GNU Binutils.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+# MA 02110-1301, USA.
+#
+
+# Exclude non-ELF targets.
+
+# The following tests require running the executable generated by ld,
+# or enough of a build environment to create a fully linked executable.
+# This is not commonly available when testing a cross-built linker.
+if ![isnative] {
+    return
+}
+
+if ![is_elf_format] {
+    return
+}
+
+# Check to see if the C compiler works
+if { [which $CC] == 0 } {
+    return
+}
+
+set build_tests {
+  {"Build secondary1.o"
+   "-r -nostdlib" ""
+   {secondary.c} {{readelf {-s} secondary.rd}} "secondary1.o"}
+  {"Build secondary1.so"
+   "-Wl,-z,nosecondary -shared" "-fPIC"
+   {secondary.c} {{readelf {--dyn-syms} secondary1.rd}} "secondary1.so"}
+  {"Build secondary2.so"
+   "-shared" "-fPIC"
+   {secondary.c} {{readelf {--dyn-syms} secondary2.rd}} "secondary2.so"}
+  {"Build libfoo.so"
+   "-shared" "-fPIC"
+   {secondary-foo.c} {} "libfoo.so"}
+  {"Build secondary-main with secondary.o"
+   "tmpdir/secondary.o tmpdir/libfoo.so" ""
+   {secondary-main.c} {{readelf {--dyn-syms} secondary1.rd}} "secondary"}
+  {"Build library1.so"
+   "-shared" "-fPIC -DSHARED"
+   {library1.c} {} "library1.so"}
+  {"Build library2.so"
+   "-shared" "-fPIC -DSHARED"
+   {library2.c} {} "library2.so"}
+  {"Build library1.a"
+   "" ""
+   {library1.c} {} "library1.a"}
+  {"Build library2.a"
+   "" ""
+   {library2.c} {} "library2.a"}
+  {"Build secondary3a.o"
+   "" ""
+   {secondary3a.s} {} "secondary3a.a"}
+  {"Build secondary3"
+   "-nostdlib tmpdir/secondary3a.o" ""
+   {secondary3b.s} {{readelf {-s} secondary3.rd}} "secondary3"}
+  {"Build secondary4.so"
+   "-nostdlib -shared tmpdir/secondary3a.o" ""
+   {secondary4.s} {{readelf {--dyn-syms} secondary4.rd}} "secondary4.so"}
+  {"Build library5a.a"
+   "" ""
+   {library5a.c} {} "library5a.a"}
+  {"Build library5b.a"
+   "" ""
+   {library5b.c} {} "library5b.a"}
+  {"Build secondary5.a"
+   "" ""
+   {secondary5.c} {} "secondary5.a"}
+  {"Build library6a.a"
+   "" ""
+   {library6a.c} {} "library6a.a"}
+  {"Build library6b.a"
+   "" ""
+   {library6b.c} {} "library6b.a"}
+  {"Build library6c.a"
+   "" ""
+   {library6c.c} {} "library6c.a"}
+  {"Build secondary6.a"
+   "" ""
+   {secondary6.c} {} "secondary6.a"}
+  {"Build library7a.a"
+   "" ""
+   {library7a.c} {} "library7a.a"}
+  {"Build library7b.a"
+   "" ""
+   {library7b.c} {} "library7b.a"}
+  {"Build library7c.a"
+   "" ""
+   {library7c.c} {} "library7c.a"}
+  {"Build secondary7.a"
+   "" ""
+   {secondary7.c} {} "secondary7.a"}
+  {"Build library8a.so"
+   "-shared -Wl,--version-script=library8.map" "-fPIC"
+   {library8a.c} {{readelf {-s} library8a.rd}} "library8a.so"}
+  {"Build library8b.so"
+   "-shared -Wl,--version-script=library8.map" "-fPIC"
+   {library8b.c} {{readelf {-s} library8b.rd}} "library8b.so"}
+  {"Build library8c.a"
+   "" "-fPIC"
+   {library8c.c} {} "library8c.a"}
+  {"Build library8c.so"
+   "-shared -Wl,--version-script=library8.map tmpdir/library8c.o tmpdir/library8a.so tmpdir/library8b.so"
+   "-fPIC"
+   {dummy.c} {{readelf {-s} library8c.rd}} "library8c.so"}
+  {"Build secondary8a.so"
+   "-shared -Wl,--version-script=secondary8a.map" "-fPIC"
+   {secondary8a.c} {{readelf {-s} secondary8a.rd}} "secondary8a.so"}
+  {"Build secondary8b.a"
+   "" "-fPIC"
+   {secondary8b.c} {} "secondary8b.a"}
+  {"Build secondary8b.so"
+   "-shared -Wl,--start-group tmpdir/secondary8a.so tmpdir/secondary8b.o -Wl,--end-group"
+   "-fPIC"
+   {dummy.c} {{readelf {-s} secondary8b.rd}} "secondary8b.so"}
+}
+
+run_cc_link_tests $build_tests
+
+set run_tests {
+    {"Run secondary-main with secondary.o"
+     "tmpdir/secondary.o tmpdir/libfoo.so" ""
+     {secondary-main.c} "secondary1" "secondary1.out"}
+    {"Run secondary-main with secondary1.so"
+     "tmpdir/secondary1.so tmpdir/libfoo.so" ""
+     {secondary-main.c} "secondary2" "secondary1.out"}
+    {"Run secondary-main with secondary.o library1.o"
+     "tmpdir/secondary.o tmpdir/secondary.o tmpdir/library1.o tmpdir/libfoo.so" ""
+     {secondary-main.c} "secondary3" "library1.out"}
+    {"Run secondary-main with library1.o secondary.o"
+     "tmpdir/library1.o tmpdir/secondary.o tmpdir/secondary.o tmpdir/libfoo.so" ""
+     {secondary-main.c} "secondary4" "library1.out"}
+    {"Run secondary-main with secondary.o library2.o"
+     "tmpdir/secondary.o tmpdir/library2.o tmpdir/libfoo.so" ""
+     {secondary-main.c} "secondary5" "library2.out"}
+    {"Run secondary-main with library2.o secondary.o"
+     "tmpdir/library2.o tmpdir/secondary.o tmpdir/libfoo.so" ""
+     {secondary-main.c} "secondary6" "library2.out"}
+    {"Run secondary-main with secondary.o library1.so"
+     "tmpdir/secondary.o tmpdir/library1.so tmpdir/libfoo.so" ""
+     {secondary-main.c} "secondary7" "library3.out"}
+    {"Run secondary-main with library1.so secondary.o"
+     "tmpdir/library1.so tmpdir/secondary.o tmpdir/libfoo.so" ""
+     {secondary-main.c} "secondary8" "library3.out"}
+    {"Run secondary-main with secondary.o library2.so"
+     "tmpdir/secondary.o tmpdir/library2.so tmpdir/libfoo.so" ""
+     {secondary-main.c} "secondary9" "library4.out"}
+    {"Run secondary-main with library2.so secondary.o"
+     "tmpdir/library2.so tmpdir/secondary.o tmpdir/libfoo.so" ""
+     {secondary-main.c} "secondary10" "library4.out"}
+    {"Run secondary5 with library5a.a library5b.a"
+     "tmpdir/secondary5.o tmpdir/library5a.a tmpdir/library5b.a" ""
+     {dummy.c} "secondary5a" "secondary5.out"}
+    {"Run secondary5 with -( library5a.a library5b.a -)"
+     "tmpdir/secondary5.o -\\( tmpdir/library5a.a tmpdir/library5b.a -\\)" ""
+     {dummy.c} "secondary5b" "secondary5.out"}
+    {"Run secondary5 with -( library5a.a library5b.a -) -( library5a.a library5b.a -)"
+     "tmpdir/secondary5.o -\\( tmpdir/library5a.a tmpdir/library5b.a -\\) -\\( tmpdir/library5a.a tmpdir/library5b.a -\\)" ""
+     {dummy.c} "secondary5c" "secondary5.out"}
+    {"Run secondary6 with -( library6a.a library6b.a library6c.a -)"
+     "tmpdir/secondary6.o -\\( tmpdir/library6a.a tmpdir/library6b.a tmpdir/library6c.a -\\)" ""
+     {dummy.c} "secondary6" "secondary6.out"}
+    {"Run secondary7 with -( library7a.a library7b.a library7c.a -)"
+     "tmpdir/secondary7.o -\\( tmpdir/library7a.a tmpdir/library7b.a tmpdir/library7c.a -\\)" ""
+     {dummy.c} "secondary7" "secondary7.out"}
+}
+
+run_ld_link_exec_tests [] $run_tests
diff --git a/ld/testsuite/ld-elf/secondary.rd b/ld/testsuite/ld-elf/secondary.rd
new file mode 100644
index 00000000000..9931c045b09
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary.rd
@@ -0,0 +1,5 @@
+Symbol table '\.symtab' contains [0-9]+ entries:
+ +Num: +Value +Size Type +Bind +Vis +Ndx Name
+#...
+ +[0-9]+: +[0-9a-f]+ +[0-9a-f]+ +FUNC +SECOND +DEFAULT +[0-9]+ +_?bar
+#...
diff --git a/ld/testsuite/ld-elf/secondary1.out b/ld/testsuite/ld-elf/secondary1.out
new file mode 100644
index 00000000000..8d9378f95b4
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary1.out
@@ -0,0 +1 @@
+secondary bar
diff --git a/ld/testsuite/ld-elf/secondary1.rd b/ld/testsuite/ld-elf/secondary1.rd
new file mode 100644
index 00000000000..89d6d76d43e
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary1.rd
@@ -0,0 +1,5 @@
+Symbol table '\.dynsym' contains [0-9]+ entries:
+ +Num: +Value +Size Type +Bind +Vis +Ndx Name
+#...
+ +[0-9]+: +[0-9a-f]+ +[0-9a-f]+ +FUNC +WEAK +DEFAULT +[0-9]+ +_?bar
+#...
diff --git a/ld/testsuite/ld-elf/secondary2.rd b/ld/testsuite/ld-elf/secondary2.rd
new file mode 100644
index 00000000000..ff618a035ca
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary2.rd
@@ -0,0 +1,5 @@
+Symbol table '\.dynsym' contains [0-9]+ entries:
+ +Num: +Value +Size Type +Bind +Vis +Ndx Name
+#...
+ +[0-9]+: +[0-9a-f]+ +[0-9a-f]+ +FUNC +SECOND +DEFAULT +[0-9]+ +_?bar
+#...
diff --git a/ld/testsuite/ld-elf/secondary3.rd b/ld/testsuite/ld-elf/secondary3.rd
new file mode 100644
index 00000000000..562244a0294
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary3.rd
@@ -0,0 +1,6 @@
+Symbol table '\.symtab' contains [0-9]+ entries:
+ +Num: +Value +Size Type +Bind +Vis +Ndx Name
+#failif
+#...
+ +[0-9]+: +0+ +0+ +[A-Z]+ +WEAK +DEFAULT +UND +_?foo
+#...
diff --git a/ld/testsuite/ld-elf/secondary3a.s b/ld/testsuite/ld-elf/secondary3a.s
new file mode 100644
index 00000000000..16a130043ef
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary3a.s
@@ -0,0 +1,4 @@
+	.section .text,"axG",%progbits,foo_group,comdat
+	.global bar
+bar:
+	.byte 0
diff --git a/ld/testsuite/ld-elf/secondary3b.s b/ld/testsuite/ld-elf/secondary3b.s
new file mode 100644
index 00000000000..cc6f37bd7e2
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary3b.s
@@ -0,0 +1,20 @@
+	.section .text,"axG",%progbits,foo_group,comdat
+	.secondary foo
+	.global bar
+foo:
+	.byte 0
+bar:
+	.byte 0
+	.data
+	.dc.a foo
+
+	.text
+	.global start	/* Used by SH targets.  */
+start:
+	.global _start
+_start:
+	.global __start
+__start:
+	.global main	/* Used by HPPA targets.  */
+main:
+	.dc.a bar
diff --git a/ld/testsuite/ld-elf/secondary4.rd b/ld/testsuite/ld-elf/secondary4.rd
new file mode 100644
index 00000000000..e84b1a6cb86
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary4.rd
@@ -0,0 +1,5 @@
+Symbol table '\.dynsym' contains [0-9]+ entries:
+ +Num: +Value +Size Type +Bind +Vis +Ndx Name
+#...
+ +[0-9]+: +0+ +0+ +[A-Z]+ +WEAK +DEFAULT +UND +_?foo
+#...
diff --git a/ld/testsuite/ld-elf/secondary4.s b/ld/testsuite/ld-elf/secondary4.s
new file mode 100644
index 00000000000..a2acf21c573
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary4.s
@@ -0,0 +1,9 @@
+	.section .text,"axG",%progbits,foo_group,comdat
+	.secondary foo
+	.global bar
+foo:
+	.byte 0
+bar:
+	.byte 0
+	.data
+	.dc.a foo
diff --git a/ld/testsuite/ld-elf/secondary5.c b/ld/testsuite/ld-elf/secondary5.c
new file mode 100644
index 00000000000..a2b2f20695a
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary5.c
@@ -0,0 +1,10 @@
+extern void foo (void);
+extern void xxx (void);
+
+int
+main (void)
+{
+  foo ();
+  xxx ();
+  return 0;
+}
diff --git a/ld/testsuite/ld-elf/secondary5.out b/ld/testsuite/ld-elf/secondary5.out
new file mode 100644
index 00000000000..730c35dceb3
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary5.out
@@ -0,0 +1,3 @@
+foo
+secondary bar
+xxx
diff --git a/ld/testsuite/ld-elf/secondary6.c b/ld/testsuite/ld-elf/secondary6.c
new file mode 100644
index 00000000000..2a7e17b94b0
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary6.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+extern void xxx (void);
+
+int
+main (void)
+{
+  xxx ();
+  printf ("OK\n");
+  return 0;
+}
diff --git a/ld/testsuite/ld-elf/secondary6.out b/ld/testsuite/ld-elf/secondary6.out
new file mode 100644
index 00000000000..d86bac9de59
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary6.out
@@ -0,0 +1 @@
+OK
diff --git a/ld/testsuite/ld-elf/secondary7.c b/ld/testsuite/ld-elf/secondary7.c
new file mode 100644
index 00000000000..9a67352e95c
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary7.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+extern void abort (void);
+extern int xxx (void);
+
+int
+main (void)
+{
+  if (xxx () != 0)
+    abort ();
+  printf ("OK\n");
+  return 0;
+}
diff --git a/ld/testsuite/ld-elf/secondary7.out b/ld/testsuite/ld-elf/secondary7.out
new file mode 100644
index 00000000000..d86bac9de59
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary7.out
@@ -0,0 +1 @@
+OK
diff --git a/ld/testsuite/ld-elf/secondary8a.c b/ld/testsuite/ld-elf/secondary8a.c
new file mode 100644
index 00000000000..22b55aa4256
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary8a.c
@@ -0,0 +1,13 @@
+#if 1
+asm (".secondary __bar");
+asm (".secondary bar");
+#else
+asm (".weak __bar");
+asm (".weak bar");
+#endif
+
+void
+__bar (void)
+{
+}
+asm (".set bar, __bar");
diff --git a/ld/testsuite/ld-elf/secondary8a.map b/ld/testsuite/ld-elf/secondary8a.map
new file mode 100644
index 00000000000..29476406f7c
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary8a.map
@@ -0,0 +1,4 @@
+VERS_1 {
+  global: bar;
+  local: *;
+};
diff --git a/ld/testsuite/ld-elf/secondary8a.rd b/ld/testsuite/ld-elf/secondary8a.rd
new file mode 100644
index 00000000000..f52033c4dad
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary8a.rd
@@ -0,0 +1,5 @@
+Symbol table '\.dynsym' contains [0-9]+ entries:
+ +Num: +Value +Size Type +Bind +Vis +Ndx Name
+#...
+ +[0-9]+: +[0-9a-f]+ +[0-9]+ +FUNC +SECOND +DEFAULT +[0-9]+ +_?bar@@VERS_1
+#...
diff --git a/ld/testsuite/ld-elf/secondary8b.c b/ld/testsuite/ld-elf/secondary8b.c
new file mode 100644
index 00000000000..22b55aa4256
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary8b.c
@@ -0,0 +1,13 @@
+#if 1
+asm (".secondary __bar");
+asm (".secondary bar");
+#else
+asm (".weak __bar");
+asm (".weak bar");
+#endif
+
+void
+__bar (void)
+{
+}
+asm (".set bar, __bar");
diff --git a/ld/testsuite/ld-elf/secondary8b.rd b/ld/testsuite/ld-elf/secondary8b.rd
new file mode 100644
index 00000000000..276c3ce72f5
--- /dev/null
+++ b/ld/testsuite/ld-elf/secondary8b.rd
@@ -0,0 +1,5 @@
+Symbol table '\.dynsym' contains [0-9]+ entries:
+ +Num: +Value +Size Type +Bind +Vis +Ndx Name
+#...
+ +[0-9]+: +0+ +0+ +FUNC +SECOND +DEFAULT +UND +_?bar@VERS_1 +\([0-9]+\)
+#...
-- 
2.26.0