1 files changed, 39 insertions, 0 deletions
diff --git a/include/tools/long.hxx b/include/tools/long.hxx
new file mode 100644
index 0000000000..2388565df0
--- /dev/null
+++ b/include/tools/long.hxx
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+#pragma once
+
+#include <sal/types.h>
+
+/**
+ * We have an unfortunate problem in that, on Windows (both 32 and 64-bit), long is always 32-bit.
+ * But on Linux (64-bit) long is 64-bit. Which leads to nasty situations where things that work
+ * on Linux, failed on Windows.
+ * So.....,
+ * (1) introduce a typedef that replaces (almost) all previous usage
+ * (2) on 64-bit Windows, this typedef is forced to 64-bit (32-bit platforms, including 32-bit Windows, are left alone)
+ * (3) fix fallout from (2)
+ *
+ * As a consequence of the above, it would be best, over the long term, to regard usage
+ * of tools::Long in the codebase as meaning "we're not sure what the ideal size of the datatype is",
+ * and where possible, replace it with a better datatype like sal_Int32/sal_Int64/etc.
+ *
+ * NOTE: If you change this, make sure HAVE_FEATURE_JUMBO_SHEETS matches this, as it requires at least 64bit tools::Long.
+ */
+namespace tools
+{
+#if defined _WIN64
+typedef sal_Int64 Long;
+typedef sal_uInt64 ULong;
+#else
+typedef long Long;
+typedef unsigned long ULong;
+#endif
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */