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+// Copyright (c) 2011 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.
+
+// This file adds defines about the platform we're currently building on.
+// Operating System:
+// OS_WIN / OS_MACOSX / OS_LINUX / OS_POSIX (MACOSX or LINUX)
+// Compiler:
+// COMPILER_MSVC / COMPILER_GCC
+// Processor:
+// ARCH_CPU_X86 / ARCH_CPU_X86_64 / ARCH_CPU_X86_FAMILY (X86 or X86_64)
+// ARCH_CPU_32_BITS / ARCH_CPU_64_BITS
+
+#ifndef BUILD_BUILD_CONFIG_H_
+#define BUILD_BUILD_CONFIG_H_
+
+// A set of macros to use for platform detection.
+#if defined(__APPLE__)
+#define OS_MACOSX 1
+#elif defined(ANDROID)
+#define OS_ANDROID 1
+#elif defined(__native_client__)
+#define OS_NACL 1
+#elif defined(__linux__)
+#define OS_LINUX 1
+// Use TOOLKIT_GTK on linux if TOOLKIT_VIEWS isn't defined.
+#if !defined(TOOLKIT_VIEWS)
+#define TOOLKIT_GTK
+#endif
+#elif defined(_WIN32)
+#define OS_WIN 1
+#define TOOLKIT_VIEWS 1
+#elif defined(__FreeBSD__)
+#define OS_FREEBSD 1
+#define TOOLKIT_GTK
+#elif defined(__OpenBSD__)
+#define OS_OPENBSD 1
+#define TOOLKIT_GTK
+#elif defined(__sun)
+#define OS_SOLARIS 1
+#define TOOLKIT_GTK
+#else
+#error Please add support for your platform in build/build_config.h
+#endif
+
+// A flag derived from the above flags, used to cover GTK code in
+// both TOOLKIT_GTK and TOOLKIT_VIEWS.
+#if defined(TOOLKIT_GTK) || (defined(TOOLKIT_VIEWS) && !defined(OS_WIN))
+#define TOOLKIT_USES_GTK 1
+#endif
+
+#if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_OPENBSD) || \
+ defined(OS_SOLARIS) || defined(OS_ANDROID)
+#if !defined(USE_OPENSSL)
+#define USE_NSS 1 // Default to use NSS for crypto, unless OpenSSL is chosen.
+#endif
+#ifndef OS_ANDROID
+#define USE_X11 1 // Use X for graphics.
+#endif
+#endif
+
+#if defined(USE_OPENSSL) && defined(USE_NSS)
+#error Cannot use both OpenSSL and NSS
+#endif
+
+// For access to standard POSIXish features, use OS_POSIX instead of a
+// more specific macro.
+#if defined(OS_MACOSX) || defined(OS_LINUX) || defined(OS_FREEBSD) || \
+ defined(OS_OPENBSD) || defined(OS_SOLARIS) || defined(OS_ANDROID) || \
+ defined(OS_NACL)
+#define OS_POSIX 1
+#endif
+
+// Use tcmalloc
+#if (defined(OS_WIN) || defined(OS_LINUX)) && !defined(NO_TCMALLOC)
+#define USE_TCMALLOC 1
+#endif
+
+// Use heapchecker.
+#if defined(OS_LINUX) && !defined(NO_HEAPCHECKER)
+#define USE_HEAPCHECKER 1
+#endif
+
+// Compiler detection.
+#if defined(__GNUC__)
+#define COMPILER_GCC 1
+#elif defined(_MSC_VER)
+#define COMPILER_MSVC 1
+#else
+#error Please add support for your compiler in build/build_config.h
+#endif
+
+// Processor architecture detection. For more info on what's defined, see:
+// http://msdn.microsoft.com/en-us/library/b0084kay.aspx
+// http://www.agner.org/optimize/calling_conventions.pdf
+// or with gcc, run: "echo | gcc -E -dM -"
+#if defined(_M_X64) || defined(__x86_64__)
+#define ARCH_CPU_X86_FAMILY 1
+#define ARCH_CPU_X86_64 1
+#define ARCH_CPU_64_BITS 1
+#define ARCH_CPU_LITTLE_ENDIAN 1
+#elif defined(_M_IX86) || defined(__i386__)
+#define ARCH_CPU_X86_FAMILY 1
+#define ARCH_CPU_X86 1
+#define ARCH_CPU_32_BITS 1
+#define ARCH_CPU_LITTLE_ENDIAN 1
+#elif defined(__ARMEL__)
+#define ARCH_CPU_ARM_FAMILY 1
+#define ARCH_CPU_ARMEL 1
+#define ARCH_CPU_32_BITS 1
+#define ARCH_CPU_LITTLE_ENDIAN 1
+#define WCHAR_T_IS_UNSIGNED 1
+#else
+#error Please add support for your architecture in build/build_config.h
+#endif
+
+// Type detection for wchar_t.
+#if defined(OS_WIN)
+#define WCHAR_T_IS_UTF16
+#elif defined(OS_POSIX) && defined(COMPILER_GCC) && \
+ defined(__WCHAR_MAX__) && \
+ (__WCHAR_MAX__ == 0x7fffffff || __WCHAR_MAX__ == 0xffffffff)
+#define WCHAR_T_IS_UTF32
+#elif defined(OS_POSIX) && defined(COMPILER_GCC) && \
+ defined(__WCHAR_MAX__) && \
+ (__WCHAR_MAX__ == 0x7fff || __WCHAR_MAX__ == 0xffff)
+// On Posix, we'll detect short wchar_t, but projects aren't guaranteed to
+// compile in this mode (in particular, Chrome doesn't). This is intended for
+// other projects using base who manage their own dependencies and make sure
+// short wchar works for them.
+#define WCHAR_T_IS_UTF16
+#else
+#error Please add support for your compiler in build/build_config.h
+#endif
+
+#if defined(OS_CHROMEOS)
+// Single define to trigger whether CrOS fonts have BCI on.
+// In that case font sizes/deltas should be adjusted.
+//define CROS_FONTS_USING_BCI
+#endif
+
+#if defined(OS_ANDROID)
+// The compiler thinks std::string::const_iterator and "const char*" are
+// equivalent types.
+#define STD_STRING_ITERATOR_IS_CHAR_POINTER
+// The compiler thinks base::string16::const_iterator and "char16*" are
+// equivalent types.
+#define BASE_STRING16_ITERATOR_IS_CHAR16_POINTER
+#endif
+
+#endif // BUILD_BUILD_CONFIG_H_