text: // Copyright (c) 2012 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_AIX / OS_ANDROID / OS_ASMJS / OS_FREEBSD / OS_FUCHSIA / OS_IOS /
  //    OS_LINUX / OS_MAC / OS_NACL (SFI or NONSFI) / OS_NETBSD / OS_OPENBSD /
  //    OS_QNX / OS_SOLARIS / OS_WIN
  //  Operating System family:
  //    OS_APPLE: IOS or MAC
  //    OS_BSD: FREEBSD or NETBSD or OPENBSD
  //    OS_POSIX: AIX or ANDROID or ASMJS or CHROMEOS or FREEBSD or IOS or LINUX
  //              or MAC or NACL or NETBSD or OPENBSD or QNX or SOLARIS
  //
  //  /!\ Note: OS_CHROMEOS is set by the build system, not this file
  //
  //  Compiler:
  //    COMPILER_MSVC / COMPILER_GCC
  //
  //  Processor:
  //    ARCH_CPU_ARM64 / ARCH_CPU_ARMEL / ARCH_CPU_MIPS / ARCH_CPU_MIPS64 /
  //    ARCH_CPU_MIPS64EL / ARCH_CPU_MIPSEL / ARCH_CPU_PPC64 / ARCH_CPU_S390 /
  //    ARCH_CPU_S390X / ARCH_CPU_X86 / ARCH_CPU_X86_64
  //  Processor family:
  //    ARCH_CPU_ARM_FAMILY: ARMEL or ARM64
  //    ARCH_CPU_MIPS_FAMILY: MIPS64EL or MIPSEL or MIPS64 or MIPS
  //    ARCH_CPU_PPC64_FAMILY: PPC64
  //    ARCH_CPU_S390_FAMILY: S390 or S390X
  //    ARCH_CPU_X86_FAMILY: X86 or X86_64
  //  Processor features:
  //    ARCH_CPU_31_BITS / ARCH_CPU_32_BITS / ARCH_CPU_64_BITS
  //    ARCH_CPU_BIG_ENDIAN / ARCH_CPU_LITTLE_ENDIAN
  
  #ifndef BUILD_BUILD_CONFIG_H_
  #define BUILD_BUILD_CONFIG_H_
  
  // A set of macros to use for platform detection.
  #if defined(__native_client__)
  // __native_client__ must be first, so that other OS_ defines are not set.
  #define OS_NACL 1
  // OS_NACL comes in two sandboxing technology flavors, SFI or Non-SFI.
  // PNaCl toolchain defines __native_client_nonsfi__ macro in Non-SFI build
  // mode, while it does not in SFI build mode.
  #if defined(__native_client_nonsfi__)
  #define OS_NACL_NONSFI
  #else
  #define OS_NACL_SFI
  #endif
  #elif defined(ANDROID)
  #define OS_ANDROID 1
  #elif defined(__APPLE__)
  // Only include TargetConditionals after testing ANDROID as some Android builds
  // on the Mac have this header available and it's not needed unless the target
  // is really an Apple platform.
  #include <TargetConditionals.h>
  #if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
  #define OS_IOS 1
  #else
  #define OS_MAC 1
  #endif  // defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
  #elif defined(__linux__)
  #define OS_LINUX 1
  // Include a system header to pull in features.h for glibc/uclibc macros.
  #include <unistd.h>
  #if defined(__GLIBC__) && !defined(__UCLIBC__)
  // We really are using glibc, not uClibc pretending to be glibc.
  #define LIBC_GLIBC 1
  #endif
  #elif defined(_WIN32)
  #define OS_WIN 1
  #elif defined(__Fuchsia__)
  #define OS_FUCHSIA 1
  #elif defined(__FreeBSD__)
  #define OS_FREEBSD 1
  #elif defined(__NetBSD__)
  #define OS_NETBSD 1
  #elif defined(__OpenBSD__)
  #define OS_OPENBSD 1
  #elif defined(__sun)
  #define OS_SOLARIS 1
  #elif defined(__QNXNTO__)
  #define OS_QNX 1
  #elif defined(_AIX)
  #define OS_AIX 1
  #elif defined(__asmjs__) || defined(__wasm__)
  #define OS_ASMJS 1
  #else
  #error Please add support for your platform in build/build_config.h
  #endif
  // NOTE: Adding a new port? Please follow
  // https://chromium.googlesource.com/chromium/src/+/master/docs/new_port_policy.md
  
  #if defined(OS_MAC) || defined(OS_IOS)
  #define OS_APPLE 1
  #endif
  
  // For access to standard BSD features, use OS_BSD instead of a
  // more specific macro.
  #if defined(OS_FREEBSD) || defined(OS_NETBSD) || defined(OS_OPENBSD)
  #define OS_BSD 1
  #endif
  
  // For access to standard POSIXish features, use OS_POSIX instead of a
  // more specific macro.
  #if defined(OS_AIX) || defined(OS_ANDROID) || defined(OS_ASMJS) || \
      defined(OS_CHROMEOS) || defined(OS_FREEBSD) || defined(OS_IOS) || \
      defined(OS_LINUX) || defined(OS_MAC) || defined(OS_NACL) || \
      defined(OS_NETBSD) || defined(OS_OPENBSD) || defined(OS_QNX) || \
      defined(OS_SOLARIS)
  #define OS_POSIX 1
  #endif
  
  // Compiler detection. Note: clang masquerades as GCC on POSIX and as MSVC on
  // Windows.
  #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(__s390x__)
  #define ARCH_CPU_S390_FAMILY 1
  #define ARCH_CPU_S390X 1
  #define ARCH_CPU_64_BITS 1
  #define ARCH_CPU_BIG_ENDIAN 1
  #elif defined(__s390__)
  #define ARCH_CPU_S390_FAMILY 1
  #define ARCH_CPU_S390 1
  #define ARCH_CPU_31_BITS 1
  #define ARCH_CPU_BIG_ENDIAN 1
  #elif (defined(__PPC64__) || defined(__PPC__)) && defined(__BIG_ENDIAN__)
  #define ARCH_CPU_PPC64_FAMILY 1
  #define ARCH_CPU_PPC64 1
  #define ARCH_CPU_64_BITS 1
  #define ARCH_CPU_BIG_ENDIAN 1
  #elif defined(__PPC64__)
  #define ARCH_CPU_PPC64_FAMILY 1
  #define ARCH_CPU_PPC64 1
  #define ARCH_CPU_64_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
  #elif defined(__aarch64__) || defined(_M_ARM64)
  #define ARCH_CPU_ARM_FAMILY 1
  #define ARCH_CPU_ARM64 1
  #define ARCH_CPU_64_BITS 1
  #define ARCH_CPU_LITTLE_ENDIAN 1
  #elif defined(__pnacl__) || defined(__asmjs__) || defined(__wasm__)
  #define ARCH_CPU_32_BITS 1
  #define ARCH_CPU_LITTLE_ENDIAN 1
  #elif defined(__MIPSEL__)
  #if defined(__LP64__)
  #define ARCH_CPU_MIPS_FAMILY 1
  #define ARCH_CPU_MIPS64EL 1
  #define ARCH_CPU_64_BITS 1
  #define ARCH_CPU_LITTLE_ENDIAN 1
  #else
  #define ARCH_CPU_MIPS_FAMILY 1
  #define ARCH_CPU_MIPSEL 1
  #define ARCH_CPU_32_BITS 1
  #define ARCH_CPU_LITTLE_ENDIAN 1
  #endif
  #elif defined(__MIPSEB__)
  #if defined(__LP64__)
  #define ARCH_CPU_MIPS_FAMILY 1
  #define ARCH_CPU_MIPS64 1
  #define ARCH_CPU_64_BITS 1
  #define ARCH_CPU_BIG_ENDIAN 1
  #else
  #define ARCH_CPU_MIPS_FAMILY 1
  #define ARCH_CPU_MIPS 1
  #define ARCH_CPU_32_BITS 1
  #define ARCH_CPU_BIG_ENDIAN 1
  #endif
  #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_FUCHSIA)
  #define WCHAR_T_IS_UTF32
  #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_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_
  