Index: opts.c
===================================================================
--- opts.c	(revision 181028)
+++ opts.c	(working copy)
@@ -784,6 +784,8 @@ 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)