gdb: add target_ops::supports_displaced_step

[deliverable/binutils-gdb.git] / gold / gold-threads.h

diff --git a/gold/gold-threads.h b/gold/gold-threads.h
index 78a87b24d645221839425b3ff3060067e9b4aba9..48388aef6425d9afc836d40c2cf704c04367df35 100644 (file)
--- a/gold/gold-threads.h
+++ b/gold/gold-threads.h
@@ -1,6 +1,6 @@
 // gold-threads.h -- thread support for gold  -*- C++ -*-
 
-// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of gold.
@@ -200,6 +200,10 @@ class Once
  public:
   Once();
 
+  virtual
+  ~Once()
+  { }
+
   // Call this function to do whatever it is.  We pass an argument
   // even though you have to use a child class because in some uses
   // setting the argument would itself require a Once class.
@@ -219,8 +223,10 @@ class Once
  private:
   // True if we have already run the function.
   bool was_run_;
+#if defined(ENABLE_THREADS) && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
   // Internal compare-and-swap lock on was_run_;
   uint32_t was_run_lock_;
+#endif
   // The lock to run the function only once.
   Once_initialize* once_;
 };