Index: gimple-streamer-out.c
===================================================================
--- gimple-streamer-out.c	(revision 181588)
+++ gimple-streamer-out.c	(working copy)
@@ -151,6 +151,11 @@ output_gimple_stmt (struct output_block
     case GIMPLE_PREDICT:
       break;
 
+    case GIMPLE_TRANSACTION:
+      gcc_assert (gimple_transaction_body (stmt) == NULL);
+      stream_write_tree (ob, gimple_transaction_label (stmt), true);
+      break;
+
     default:
       gcc_unreachable ();
     }
Index: testsuite/gcc.dg/lto/trans-mem-2_0.c
===================================================================
--- testsuite/gcc.dg/lto/trans-mem-2_0.c	(revision 0)
+++ testsuite/gcc.dg/lto/trans-mem-2_0.c	(revision 0)
@@ -0,0 +1,19 @@
+/* { dg-lto-options {{-flto -fgnu-tm}} } */
+
+extern void foobar() __attribute__((transaction_callable));
+
+#define dummy(func) \
+  __attribute__((noinline,noclone,used)) void func() { asm (""); }
+
+dummy(_ITM_beginTransaction)
+dummy(_ITM_commitTransaction)
+dummy(_ITM_WU4)
+dummy(_ITM_WU8)
+
+main()
+{
+  __transaction_relaxed
+    {
+      foobar();
+    }
+}
Index: testsuite/gcc.dg/lto/trans-mem-2_1.c
===================================================================
--- testsuite/gcc.dg/lto/trans-mem-2_1.c	(revision 0)
+++ testsuite/gcc.dg/lto/trans-mem-2_1.c	(revision 0)
@@ -0,0 +1,4 @@
+__attribute__((transaction_callable,noinline))
+void foobar() 
+{
+}
Index: testsuite/gcc.dg/lto/trans-mem-1_0.c
===================================================================
--- testsuite/gcc.dg/lto/trans-mem-1_0.c	(revision 0)
+++ testsuite/gcc.dg/lto/trans-mem-1_0.c	(revision 0)
@@ -0,0 +1,11 @@
+/* { dg-lto-options {{-flto -fgnu-tm}} } */
+
+int i;
+
+main()
+{
+  __transaction_atomic
+    {
+      i = 0;
+    }
+}
Index: testsuite/gcc.dg/lto/trans-mem-1_1.c
===================================================================
--- testsuite/gcc.dg/lto/trans-mem-1_1.c	(revision 0)
+++ testsuite/gcc.dg/lto/trans-mem-1_1.c	(revision 0)
@@ -0,0 +1,7 @@
+#define dummy(func) \
+  __attribute__((noinline,noclone,used)) void func() { asm (""); }
+
+dummy(_ITM_beginTransaction)
+dummy(_ITM_commitTransaction)
+dummy(_ITM_WU4)
+dummy(_ITM_WU8)
Index: lto-cgraph.c
===================================================================
--- lto-cgraph.c	(revision 181588)
+++ lto-cgraph.c	(working copy)
@@ -522,6 +522,7 @@ lto_output_node (struct lto_simple_outpu
   bp_pack_value (&bp, node->frequency, 2);
   bp_pack_value (&bp, node->only_called_at_startup, 1);
   bp_pack_value (&bp, node->only_called_at_exit, 1);
+  bp_pack_value (&bp, node->tm_clone, 1);
   bp_pack_value (&bp, node->thunk.thunk_p && !boundary_p, 1);
   bp_pack_enum (&bp, ld_plugin_symbol_resolution,
 	        LDPR_NUM_KNOWN, node->resolution);
@@ -928,6 +929,7 @@ input_overwrite_node (struct lto_file_de
   node->frequency = (enum node_frequency)bp_unpack_value (bp, 2);
   node->only_called_at_startup = bp_unpack_value (bp, 1);
   node->only_called_at_exit = bp_unpack_value (bp, 1);
+  node->tm_clone = bp_unpack_value (bp, 1);
   node->thunk.thunk_p = bp_unpack_value (bp, 1);
   node->resolution = bp_unpack_enum (bp, ld_plugin_symbol_resolution,
 				     LDPR_NUM_KNOWN);
Index: opts.c
===================================================================
--- opts.c	(revision 181588)
+++ opts.c	(working copy)
@@ -784,8 +784,6 @@ finish_options (struct gcc_options *opts
 #endif
       if (!opts->x_flag_fat_lto_objects && !HAVE_LTO_PLUGIN)
         error_at (loc, "-fno-fat-lto-objects are supported only with linker plugin.");
-      if (opts->x_flag_tm)
-	error_at (loc, "LTO is currently not supported with transactional memory");
 }
   if ((opts->x_flag_lto_partition_balanced != 0) + (opts->x_flag_lto_partition_1to1 != 0)
        + (opts->x_flag_lto_partition_none != 0) >= 1)
Index: lto/lto-lang.c
===================================================================
--- lto/lto-lang.c	(revision 181588)
+++ lto/lto-lang.c	(working copy)
@@ -46,6 +46,7 @@ static tree handle_nonnull_attribute (tr
 static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *);
 static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *);
 static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *);
+static tree handle_transaction_pure_attribute (tree *, tree, tree, int, bool *);
 static tree handle_format_attribute (tree *, tree, tree, int, bool *);
 static tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 
@@ -75,6 +76,8 @@ const struct attribute_spec lto_attribut
 			      handle_sentinel_attribute, false },
   { "type generic",           0, 0, false, true, true,
 			      handle_type_generic_attribute, false },
+  { "transaction_pure",	      0, 0, false, true, true,
+			      handle_transaction_pure_attribute, false },
   { NULL,                     0, 0, false, false, false, NULL, false }
 };
 
@@ -401,6 +404,20 @@ handle_type_generic_attribute (tree *nod
 
   return NULL_TREE;
 }
+
+/* Handle a "transaction_pure" attribute.  */
+
+static tree
+handle_transaction_pure_attribute (tree *node, tree ARG_UNUSED (name),
+				   tree ARG_UNUSED (args),
+				   int ARG_UNUSED (flags),
+				   bool * ARG_UNUSED (no_add_attrs))
+{
+  /* Ensure we have a function type.  */
+  gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE);
+
+  return NULL_TREE;
+}
 
 /* Handle a "format" attribute; arguments as in
    struct attribute_spec.handler.  */
Index: gimple-streamer-in.c
===================================================================
--- gimple-streamer-in.c	(revision 181588)
+++ gimple-streamer-in.c	(working copy)
@@ -238,6 +238,10 @@ input_gimple_stmt (struct lto_input_bloc
     case GIMPLE_PREDICT:
       break;
 
+    case GIMPLE_TRANSACTION:
+      gimple_transaction_set_label (stmt, stream_read_tree (ib, data_in));
+      break;
+
     default:
       internal_error ("bytecode stream: unknown GIMPLE statement tag %s",
 		      lto_tag_name (tag));