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+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_PORT_H_
+#define BASE_PORT_H_
+#pragma once
+
+#include <stdarg.h>
+#include "build/build_config.h"
+
+#ifdef COMPILER_MSVC
+#define GG_LONGLONG(x) x##I64
+#define GG_ULONGLONG(x) x##UI64
+#else
+#define GG_LONGLONG(x) x##LL
+#define GG_ULONGLONG(x) x##ULL
+#endif
+
+// Per C99 7.8.14, define __STDC_CONSTANT_MACROS before including <stdint.h>
+// to get the INTn_C and UINTn_C macros for integer constants. It's difficult
+// to guarantee any specific ordering of header includes, so it's difficult to
+// guarantee that the INTn_C macros can be defined by including <stdint.h> at
+// any specific point. Provide GG_INTn_C macros instead.
+
+#define GG_INT8_C(x) (x)
+#define GG_INT16_C(x) (x)
+#define GG_INT32_C(x) (x)
+#define GG_INT64_C(x) GG_LONGLONG(x)
+
+#define GG_UINT8_C(x) (x ## U)
+#define GG_UINT16_C(x) (x ## U)
+#define GG_UINT32_C(x) (x ## U)
+#define GG_UINT64_C(x) GG_ULONGLONG(x)
+
+// It's possible for functions that use a va_list, such as StringPrintf, to
+// invalidate the data in it upon use. The fix is to make a copy of the
+// structure before using it and use that copy instead. va_copy is provided
+// for this purpose. MSVC does not provide va_copy, so define an
+// implementation here. It is not guaranteed that assignment is a copy, so the
+// StringUtil.VariableArgsFunc unit test tests this capability.
+#if defined(COMPILER_GCC)
+#define GG_VA_COPY(a, b) (va_copy(a, b))
+#elif defined(COMPILER_MSVC)
+#define GG_VA_COPY(a, b) (a = b)
+#endif
+
+// Define an OS-neutral wrapper for shared library entry points
+#if defined(OS_WIN)
+#define API_CALL __stdcall
+#else
+#define API_CALL
+#endif
+
+#endif // BASE_PORT_H_