* ldgram.y (vers_node): Support anonymous version tags.

	* ldlang.c (lang_register_vers_node): Ensure anonymous version
	tag is not defined together with non-anonymous versions.
	* ld.texinfo: Document it.

	* elflink.h (size_dynamic_sections): Skip anonymous version tag.
	(elf_link_assign_sym_version): Don't count anonymous version tag.

4 files changed, 38 insertions, 3 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 7ce98c8..c4f9443 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,10 @@
+2001-12-18  Jakub Jelinek  <jakub@redhat.com>
+
+	* ldgram.y (vers_node): Support anonymous version tags.
+	* ldlang.c (lang_register_vers_node): Ensure anonymous version
+	tag is not defined together with non-anonymous versions.
+	* ld.texinfo: Document it.
+
 2001-12-18  Nick Clifton  <nickc@cambridge.redhat.com>
 
 	* po/tr.po: New file: Turkish translation.
diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index 1967ef5..5594446 100644
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@@ -3685,6 +3685,15 @@ they might suggest to the person reading them.  The @samp{2.0} version
 could just as well have appeared in between @samp{1.1} and @samp{1.2}.
 However, this would be a confusing way to write a version script.
 
+Node name can be omited, provided it is the only version node
+in the version script.  Such version script doesn't assign any versions to
+symbols, only selects which symbols will be globally visible out and which
+won't.
+
+@smallexample
+@{ global: foo; bar; local: *; @}
+#end smallexample
+
 When you link an application against a shared library that has versioned
 symbols, the application itself knows which version of each symbol it
 requires, and it also knows which version nodes it needs from each
diff --git a/ld/ldgram.y b/ld/ldgram.y
index c57ad15..f1924a0 100644
--- a/ld/ldgram.y
+++ b/ld/ldgram.y
@@ -1061,7 +1061,11 @@ vers_nodes:
 	;
 
 vers_node:
-		VERS_TAG '{' vers_tag '}' ';'
+		'{' vers_tag '}' ';'
+		{
+		  lang_register_vers_node (NULL, $2, NULL);
+		}
+	|	VERS_TAG '{' vers_tag '}' ';'
 		{
 		  lang_register_vers_node ($1, $3, NULL);
 		}
diff --git a/ld/ldlang.c b/ld/ldlang.c
index 9994cf8..afce0fa 100644
--- a/ld/ldlang.c
+++ b/ld/ldlang.c
@@ -5031,6 +5031,16 @@ lang_register_vers_node (name, version, deps)
   struct bfd_elf_version_tree *t, **pp;
   struct bfd_elf_version_expr *e1;
 
+  if (name == NULL)
+    name = "";
+
+  if ((name[0] == '\0' && lang_elf_version_info != NULL)
+      || (lang_elf_version_info && lang_elf_version_info->name[0] == '\0'))
+    {
+      einfo (_("%X%P: anonymous version tag cannot be combined with other version tags\n"));
+      return;
+    }
+
   /* Make sure this node has a unique name.  */
   for (t = lang_elf_version_info; t != NULL; t = t->next)
     if (strcmp (t->name, name) == 0)
@@ -5067,8 +5077,13 @@ lang_register_vers_node (name, version, deps)
 
   version->deps = deps;
   version->name = name;
-  ++version_index;
-  version->vernum = version_index;
+  if (name[0] != '\0')
+    {
+      ++version_index;
+      version->vernum = version_index;
+    }
+  else
+    version->vernum = 0;
 
   for (pp = &lang_elf_version_info; *pp != NULL; pp = &(*pp)->next)
     ;