From: jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu, 12 Nov 2015 01:16:59 +0000 (+0000)
Subject: 	* decl.c (duplicate_decls): When combining typedefs, remove the
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ccb738ec9d63ce6a189b5795973ae014d82cc3b9;p=thirdparty%2Fgcc.git

	* decl.c (duplicate_decls): When combining typedefs, remove the
	new type from the variants list.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@230202 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 9cbda291ac7a..d1bf1219e00f 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2015-11-11  Jason Merrill  <jason@redhat.com>
+
+	* decl.c (duplicate_decls): When combining typedefs, remove the
+	new type from the variants list.
+
 2015-11-11  Jason Merrill  <jason@redhat.com>
 
 	* pt.c (instantiate_class_template_1): Set function_depth around
diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index 76cc1d176e54..383b47d29edd 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -2014,7 +2014,22 @@ duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
       /* For typedefs use the old type, as the new type's DECL_NAME points
 	 at newdecl, which will be ggc_freed.  */
       if (TREE_CODE (newdecl) == TYPE_DECL)
-	newtype = oldtype;
+	{
+	  newtype = oldtype;
+
+	  /* And remove the new type from the variants list.  */
+	  if (TYPE_NAME (TREE_TYPE (newdecl)) == newdecl)
+	    {
+	      tree remove = TREE_TYPE (newdecl);
+	      for (tree t = TYPE_MAIN_VARIANT (remove); ;
+		   t = TYPE_NEXT_VARIANT (t))
+		if (TYPE_NEXT_VARIANT (t) == remove)
+		  {
+		    TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (remove);
+		    break;
+		  }
+	    }
+	}
       else
 	/* Merge the data types specified in the two decls.  */
 	newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));