PR ld/12549

bfd/
	* elflink.c (elf_link_add_object_symbols): Exclude weak refs when
	considering whether an --as-needed library is needed.
ld/
	* ld.texinfo (--as-needed): Update.
ld/testsuite/
	* ld-elf/pr14862.out: Expect no output.

bfd/ChangeLog

@@ -1,3 +1,9 @@
+2013-03-18  Alan Modra  <amodra@gmail.com>
+
+	PR ld/12549
+	* elflink.c (elf_link_add_object_symbols): Exclude weak refs when
+	considering whether an --as-needed library is needed.
+
 2013-03-14  Tom Tromey  <tromey@redhat.com>
 
 	* opncls.c (bfd_get_debug_link_info): Rename from

bfd/elflink.c

@@ -4482,10 +4482,10 @@ error_free_dyn:
 	  if (!add_needed
 	      && definition
 	      && ((dynsym
-		   && h->ref_regular
+		   && h->ref_regular_nonweak
 		   && (undef_bfd == NULL
 		       || (undef_bfd->flags & BFD_PLUGIN) == 0))
-		  || (h->ref_dynamic
+		  || (h->ref_dynamic_nonweak
 		      && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
 		      && !on_needed_list (elf_dt_name (abfd), htab->needed))))
 	    {

ld/ChangeLog

@@ -1,3 +1,7 @@
+2013-03-18  Alan Modra  <amodra@gmail.com>
+
+	* ld.texinfo (--as-needed): Update.
+
 2013-03-14  Jakub Jelinek  <jakub@redhat.com>
 
 	* emulparams/aarch64linux.sh (LIBPATH_SUFFIX): Set to 64 for

ld/ld.texinfo

@@ -1143,11 +1143,14 @@ on the command line after the @option{--as-needed} option.  Normally
 the linker will add a DT_NEEDED tag for each dynamic library mentioned
 on the command line, regardless of whether the library is actually
 needed or not.  @option{--as-needed} causes a DT_NEEDED tag to only be
-emitted for a library that satisfies an undefined symbol reference
-from a regular object file or, if the library is not found in the
-DT_NEEDED lists of other libraries linked up to that point, an
-undefined symbol reference from another dynamic library.
-@option{--no-as-needed} restores the default behaviour.
+emitted for a library that @emph{at that point in the link} satisfies a
+non-weak undefined symbol reference from a regular object file or, if
+the library is not found in the DT_NEEDED lists of other libraries, a
+non-weak undefined symbol reference from another dynamic library.
+Object files or libraries appearing on the command line @emph{after}
+the library in question do not affect whether the library is seen as
+needed.  This is similar to the rules for extraction of object files
+from archives.  @option{--no-as-needed} restores the default behaviour.
 
 @kindex --add-needed
 @kindex --no-add-needed

ld/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2013-03-18  Alan Modra  <amodra@gmail.com>
+
+	* ld-elf/pr14862.out: Expect no output.
+
 2013-03-15  Will Newton  <will.newton@linaro.org>
 
 	* ld-arm/arm-elf.exp: Expand *-*eabi test to cover *-*eabi*.

ld/testsuite/ld-elf/pr14862.out

@@ -1 +0,0 @@
-OK