Add hb-warning.cc. Oops!

src/hb-warning.cc

+/*
+ * Copyright © 2012  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-mutex-private.hh"
+#include "hb-object-private.hh"
+
+
+#if !defined(HB_NO_MT) && defined(HB_ATOMIC_INT_NIL)
+#ifdef _MSC_VER
+#pragma message("Could not find any system to define atomic_int macros, library will NOT be thread-safe")
+#else
+#warning "Could not find any system to define atomic_int macros, library will NOT be thread-safe"
+#endif
+#endif
+
+#if !defined(HB_NO_MT) && defined(HB_MUTEX_IMPL_NIL)
+#ifdef _MSC_VER
+#pragma message("Could not find any system to define mutex macros, library will NOT be thread-safe")
+#else
+#warning "Could not find any system to define mutex macros, library will NOT be thread-safe"
+#endif
+#endif
+
+#if !defined(HB_NO_MT) && (defined(HB_ATOMIC_INT_NIL) || defined(HB_MUTEX_IMPL_NIL))
+#ifdef _MSC_VER
+#pragma message("To suppress these warnings, define HB_NO_MT")
+#else
+#warning "To suppress these warnings, define HB_NO_MT"
+#endif
+#endif