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 // © 2016 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
 /*
 ******************************************************************************
 *
 *   Copyright (C) 1997-2016, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 ******************************************************************************
 *
 *  FILE NAME : platform.h
 *
 *   Date        Name        Description
 *   05/13/98    nos         Creation (content moved here from ptypes.h).
 *   03/02/99    stephen     Added AS400 support.
 *   03/30/99    stephen     Added Linux support.
 *   04/13/99    stephen     Reworked for autoconf.
 ******************************************************************************
 */
 
 #ifndef _PLATFORM_H
 #define _PLATFORM_H
 
 #include "unicode/uconfig.h"
 #include "unicode/uvernum.h"
 
 /**
  * \file
  * \brief Basic types for the platform.
  *
  * This file used to be generated by autoconf/configure.
  * Starting with ICU 49, platform.h is a normal source file,
  * to simplify cross-compiling and working with non-autoconf/make build systems.
  *
  * When a value in this file does not work on a platform, then please
  * try to derive it from the U_PLATFORM value
  * (for which we might need a new value constant in rare cases)
  * and/or from other macros that are predefined by the compiler
  * or defined in standard (POSIX or platform or compiler) headers.
  *
  * As a temporary workaround, you can add an explicit \#define for some macros
  * before it is first tested, or add an equivalent -D macro definition
  * to the compiler's command line.
  *
  * Note: Some compilers provide ways to show the predefined macros.
  * For example, with gcc you can compile an empty .c file and have the compiler
  * print the predefined macros with
  * \code
  * gcc -E -dM -x c /dev/null | sort
  * \endcode
  * (You can provide an actual empty .c file rather than /dev/null.
  * <code>-x c++</code> is for C++.)
  */
 
 /**
  * Define some things so that they can be documented.
  * @internal
  */
 #ifdef U_IN_DOXYGEN
 /*
  * Problem: "platform.h:335: warning: documentation for unknown define U_HAVE_STD_STRING found." means that U_HAVE_STD_STRING is not documented.
  * Solution: #define any defines for non @internal API here, so that they are visible in the docs.  If you just set PREDEFINED in Doxyfile.in,  they won't be documented.
  */
 
 /* None for now. */
 #endif
 
 /**
  * \def U_PLATFORM
  * The U_PLATFORM macro defines the platform we're on.
  *
  * We used to define one different, value-less macro per platform.
  * That made it hard to know the set of relevant platforms and macros,
  * and hard to deal with variants of platforms.
  *
  * Starting with ICU 49, we define platforms as numeric macros,
  * with ranges of values for related platforms and their variants.
  * The U_PLATFORM macro is set to one of these values.
  *
  * Historical note from the Solaris Wikipedia article:
  * AT&T and Sun collaborated on a project to merge the most popular Unix variants
  * on the market at that time: BSD, System V, and Xenix.
  * This became Unix System V Release 4 (SVR4).
  *
  * @internal
  */
 
 /** Unknown platform. @internal */
 #define U_PF_UNKNOWN 0
 /** Windows @internal */
 #define U_PF_WINDOWS 1000
 /** MinGW. Windows, calls to Win32 API, but using GNU gcc and binutils. @internal */
 #define U_PF_MINGW 1800
 /**
  * Cygwin. Windows, calls to cygwin1.dll for Posix functions,
  * using MSVC or GNU gcc and binutils.
  * @internal
  */
 #define U_PF_CYGWIN 1900
 /* Reserve 2000 for U_PF_UNIX? */
 /** HP-UX is based on UNIX System V. @internal */
 #define U_PF_HPUX 2100
 /** Solaris is a Unix operating system based on SVR4. @internal */
 #define U_PF_SOLARIS 2600
 /** BSD is a UNIX operating system derivative. @internal */
 #define U_PF_BSD 3000
 /** AIX is based on UNIX System V Releases and 4.3 BSD. @internal */
 #define U_PF_AIX 3100
 /** IRIX is based on UNIX System V with BSD extensions. @internal */
 #define U_PF_IRIX 3200
 /**
  * Darwin is a POSIX-compliant operating system, composed of code developed by Apple,
  * as well as code derived from NeXTSTEP, BSD, and other projects,
  * built around the Mach kernel.
  * Darwin forms the core set of components upon which Mac OS X, Apple TV, and iOS are based.
  * (Original description modified from WikiPedia.)
  * @internal
  */
 #define U_PF_DARWIN 3500
 /** iPhone OS (iOS) is a derivative of Mac OS X. @internal */
 #define U_PF_IPHONE 3550
 /** QNX is a commercial Unix-like real-time operating system related to BSD. @internal */
 #define U_PF_QNX 3700
 /** Linux is a Unix-like operating system. @internal */
 #define U_PF_LINUX 4000
 /**
  * Native Client is pretty close to Linux.
  * See https://developer.chrome.com/native-client and
  *  http://www.chromium.org/nativeclient
  *  @internal
  */
 #define U_PF_BROWSER_NATIVE_CLIENT 4020
 /** Android is based on Linux. @internal */
 #define U_PF_ANDROID 4050
 /** Haiku is a POSIX-ish platform. @internal */
 #define U_PF_HAIKU 4080
 /** Fuchsia is a POSIX-ish platform. @internal */
 #define U_PF_FUCHSIA 4100
 /* Maximum value for Linux-based platform is 4499 */
 /**
  * Emscripten is a C++ transpiler for the Web that can target asm.js or
  * WebAssembly. It provides some POSIX-compatible wrappers and stubs and
  * some Linux-like functionality, but is not fully compatible with
  * either.
  * @internal
  */
 #define U_PF_EMSCRIPTEN 5010
 /** z/OS is the successor to OS/390 which was the successor to MVS. @internal */
 #define U_PF_OS390 9000
 /** "IBM i" is the current name of what used to be i5/OS and earlier OS/400. @internal */
 #define U_PF_OS400 9400
 
 #ifdef U_PLATFORM
     /* Use the predefined value. */
 #elif defined(__MINGW32__)
 #   define U_PLATFORM U_PF_MINGW
 #elif defined(__CYGWIN__)
 #   define U_PLATFORM U_PF_CYGWIN
     /* Cygwin uchar.h doesn't exist until Cygwin 3.5. */
 #   include <cygwin/version.h>
 #elif defined(WIN32) || defined(_WIN32) || defined(WIN64) || defined(_WIN64)
 #   define U_PLATFORM U_PF_WINDOWS
 #elif defined(__ANDROID__)
 #   define U_PLATFORM U_PF_ANDROID
     /* Android wchar_t support depends on the API level. */
 #   include <android/api-level.h>
 #elif defined(__pnacl__) || defined(__native_client__)
 #   define U_PLATFORM U_PF_BROWSER_NATIVE_CLIENT
 #elif defined(__Fuchsia__)
 #   define U_PLATFORM U_PF_FUCHSIA
 #elif defined(linux) || defined(__linux__) || defined(__linux)
 #   define U_PLATFORM U_PF_LINUX
 #elif defined(__APPLE__) && defined(__MACH__)
 #   include <TargetConditionals.h>
 #   if (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && (defined(TARGET_OS_MACCATALYST) && !TARGET_OS_MACCATALYST)   /* variant of TARGET_OS_MAC */
 #       define U_PLATFORM U_PF_IPHONE
 #   else
 #       define U_PLATFORM U_PF_DARWIN
 #   endif
 #elif defined(BSD) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__MirBSD__)
 #   if defined(__FreeBSD__)
 #       include <sys/endian.h>
 #   endif
 #   define U_PLATFORM U_PF_BSD
 #elif defined(sun) || defined(__sun)
     /* Check defined(__SVR4) || defined(__svr4__) to distinguish Solaris from SunOS? */
 #   define U_PLATFORM U_PF_SOLARIS
 #   if defined(__GNUC__)
         /* Solaris/GCC needs this header file to get the proper endianness. Normally, this
          * header file is included with stddef.h but on Solairs/GCC, the GCC version of stddef.h
          *  is included which does not include this header file.
          */
 #       include <sys/isa_defs.h>
 #   endif
 #elif defined(_AIX) || defined(__TOS_AIX__)
 #   define U_PLATFORM U_PF_AIX
 #elif defined(_hpux) || defined(hpux) || defined(__hpux)
 #   define U_PLATFORM U_PF_HPUX
 #elif defined(sgi) || defined(__sgi)
 #   define U_PLATFORM U_PF_IRIX
 #elif defined(__QNX__) || defined(__QNXNTO__)
 #   define U_PLATFORM U_PF_QNX
 #elif defined(__TOS_MVS__)
 #   define U_PLATFORM U_PF_OS390
 #elif defined(__OS400__) || defined(__TOS_OS400__)
 #   define U_PLATFORM U_PF_OS400
 #elif defined(__HAIKU__)
 #   define U_PLATFORM U_PF_HAIKU
 #elif defined(__EMSCRIPTEN__)
 #   define U_PLATFORM U_PF_EMSCRIPTEN
 #else
 #   define U_PLATFORM U_PF_UNKNOWN
 #endif
 
 /**
  * \def U_REAL_MSVC
  * Defined if the compiler is the real MSVC compiler (and not something like
  * Clang setting _MSC_VER in order to compile Windows code that requires it).
  * Otherwise undefined.
  * @internal
  */
 #if (defined(_MSC_VER) && !(defined(__clang__) && __clang__)) || defined(U_IN_DOXYGEN)
 #   define U_REAL_MSVC
 #endif
 
 /**
  * \def CYGWINMSVC
  * Defined if this is Windows with Cygwin, but using MSVC rather than gcc.
  * Otherwise undefined.
  * @internal
  */
 /* Commented out because this is already set in mh-cygwin-msvc
 #if U_PLATFORM == U_PF_CYGWIN && defined(_MSC_VER)
 #   define CYGWINMSVC
 #endif
 */
 #ifdef U_IN_DOXYGEN
 #   define CYGWINMSVC
 #endif
 
 /**
  * \def U_PLATFORM_USES_ONLY_WIN32_API
  * Defines whether the platform uses only the Win32 API.
  * Set to 1 for Windows/MSVC, ClangCL and MinGW but not Cygwin.
  * @internal
  */
 #ifdef U_PLATFORM_USES_ONLY_WIN32_API
     /* Use the predefined value. */
 #elif (U_PF_WINDOWS <= U_PLATFORM && U_PLATFORM <= U_PF_MINGW) || defined(CYGWINMSVC)
 #   define U_PLATFORM_USES_ONLY_WIN32_API 1
 #else
     /* Cygwin implements POSIX. */
 #   define U_PLATFORM_USES_ONLY_WIN32_API 0
 #endif
 
 /**
  * \def U_PLATFORM_HAS_WIN32_API
  * Defines whether the Win32 API is available on the platform.
  * Set to 1 for Windows/MSVC, ClangCL, MinGW and Cygwin.
  * @internal
  */
 #ifdef U_PLATFORM_HAS_WIN32_API
     /* Use the predefined value. */
 #elif U_PF_WINDOWS <= U_PLATFORM && U_PLATFORM <= U_PF_CYGWIN
 #   define U_PLATFORM_HAS_WIN32_API 1
 #else
 #   define U_PLATFORM_HAS_WIN32_API 0
 #endif
 
 /**
  * \def U_PLATFORM_HAS_WINUWP_API
  * Defines whether target is intended for Universal Windows Platform API
  * Set to 1 for Windows10 Release Solution Configuration
  * @internal
  */
 #ifdef U_PLATFORM_HAS_WINUWP_API
     /* Use the predefined value. */
 #else
 #   define U_PLATFORM_HAS_WINUWP_API 0
 #endif
 
 /**
  * \def U_PLATFORM_IMPLEMENTS_POSIX
  * Defines whether the platform implements (most of) the POSIX API.
  * Set to 1 for Cygwin and most other platforms.
  * @internal
  */
 #ifdef U_PLATFORM_IMPLEMENTS_POSIX
     /* Use the predefined value. */
 #elif U_PLATFORM_USES_ONLY_WIN32_API
 #   define U_PLATFORM_IMPLEMENTS_POSIX 0
 #else
 #   define U_PLATFORM_IMPLEMENTS_POSIX 1
 #endif
 
 /**
  * \def U_PLATFORM_IS_LINUX_BASED
  * Defines whether the platform is Linux or one of its derivatives.
  * @internal
  */
 #ifdef U_PLATFORM_IS_LINUX_BASED
     /* Use the predefined value. */
 #elif U_PF_LINUX <= U_PLATFORM && U_PLATFORM <= 4499
 #   define U_PLATFORM_IS_LINUX_BASED 1
 #else
 #   define U_PLATFORM_IS_LINUX_BASED 0
 #endif
 
 /**
  * \def U_PLATFORM_IS_DARWIN_BASED
  * Defines whether the platform is Darwin or one of its derivatives.
  * @internal
  */
 #ifdef U_PLATFORM_IS_DARWIN_BASED
     /* Use the predefined value. */
 #elif U_PF_DARWIN <= U_PLATFORM && U_PLATFORM <= U_PF_IPHONE
 #   define U_PLATFORM_IS_DARWIN_BASED 1
 #else
 #   define U_PLATFORM_IS_DARWIN_BASED 0
 #endif
 
 /*===========================================================================*/
 /** @{ Compiler and environment features                                     */
 /*===========================================================================*/
 
 /**
  * \def U_GCC_MAJOR_MINOR
  * Indicates whether the compiler is gcc (test for != 0),
  * and if so, contains its major (times 100) and minor version numbers.
  * If the compiler is not gcc, then U_GCC_MAJOR_MINOR == 0.
  *
  * For example, for testing for whether we have gcc, and whether it's 4.6 or higher,
  * use "#if U_GCC_MAJOR_MINOR >= 406".
  * @internal
  */
 #ifdef __GNUC__
 #   define U_GCC_MAJOR_MINOR (__GNUC__ * 100 + __GNUC_MINOR__)
 #else
 #   define U_GCC_MAJOR_MINOR 0
 #endif
 
 /**
  * \def U_IS_BIG_ENDIAN
  * Determines the endianness of the platform.
  * @internal
  */
 #ifdef U_IS_BIG_ENDIAN
     /* Use the predefined value. */
 #elif defined(BYTE_ORDER) && defined(BIG_ENDIAN)
 #   define U_IS_BIG_ENDIAN (BYTE_ORDER == BIG_ENDIAN)
 #elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__)
     /* gcc */
 #   define U_IS_BIG_ENDIAN (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
 #elif defined(__BIG_ENDIAN__) || defined(_BIG_ENDIAN)
 #   define U_IS_BIG_ENDIAN 1
 #elif defined(__LITTLE_ENDIAN__) || defined(_LITTLE_ENDIAN)
 #   define U_IS_BIG_ENDIAN 0
 #elif U_PLATFORM == U_PF_OS390 || U_PLATFORM == U_PF_OS400 || defined(__s390__) || defined(__s390x__)
     /* These platforms do not appear to predefine any endianness macros. */
 #   define U_IS_BIG_ENDIAN 1
 #elif defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0)
     /* HPPA do not appear to predefine any endianness macros. */
 #   define U_IS_BIG_ENDIAN 1
 #elif defined(sparc) || defined(__sparc) || defined(__sparc__)
     /* Some sparc based systems (e.g. Linux) do not predefine any endianness macros. */
 #   define U_IS_BIG_ENDIAN 1
 #else
 #   define U_IS_BIG_ENDIAN 0
 #endif
 
 /**
  * \def U_HAVE_PLACEMENT_NEW
  * Determines whether to override placement new and delete for STL.
  * @stable ICU 2.6
  */
 #ifdef U_HAVE_PLACEMENT_NEW
     /* Use the predefined value. */
 #elif defined(__BORLANDC__)
 #   define U_HAVE_PLACEMENT_NEW 0
 #else
 #   define U_HAVE_PLACEMENT_NEW 1
 #endif
 
 /**
  * \def U_HAVE_DEBUG_LOCATION_NEW 
  * Define this to define the MFC debug version of the operator new.
  *
  * @stable ICU 3.4
  */
 #ifdef U_HAVE_DEBUG_LOCATION_NEW
     /* Use the predefined value. */
 #elif defined(_MSC_VER)
 #   define U_HAVE_DEBUG_LOCATION_NEW 1
 #else
 #   define U_HAVE_DEBUG_LOCATION_NEW 0
 #endif
 
 /* Compatibility with compilers other than clang: http://clang.llvm.org/docs/LanguageExtensions.html */
 #ifdef __has_attribute
 #   define UPRV_HAS_ATTRIBUTE(x) __has_attribute(x)
 #else
 #   define UPRV_HAS_ATTRIBUTE(x) 0
 #endif
 #ifdef __has_cpp_attribute
 #   define UPRV_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
 #else
 #   define UPRV_HAS_CPP_ATTRIBUTE(x) 0
 #endif
 #ifdef __has_declspec_attribute
 #   define UPRV_HAS_DECLSPEC_ATTRIBUTE(x) __has_declspec_attribute(x)
 #else
 #   define UPRV_HAS_DECLSPEC_ATTRIBUTE(x) 0
 #endif
 #ifdef __has_builtin
 #   define UPRV_HAS_BUILTIN(x) __has_builtin(x)
 #else
 #   define UPRV_HAS_BUILTIN(x) 0
 #endif
 #ifdef __has_feature
 #   define UPRV_HAS_FEATURE(x) __has_feature(x)
 #else
 #   define UPRV_HAS_FEATURE(x) 0
 #endif
 #ifdef __has_extension
 #   define UPRV_HAS_EXTENSION(x) __has_extension(x)
 #else
 #   define UPRV_HAS_EXTENSION(x) 0
 #endif
 #ifdef __has_warning
 #   define UPRV_HAS_WARNING(x) __has_warning(x)
 #else
 #   define UPRV_HAS_WARNING(x) 0
 #endif
 
 
 #if defined(__clang__)
 #define UPRV_NO_SANITIZE_UNDEFINED __attribute__((no_sanitize("undefined")))
 #else
 #define UPRV_NO_SANITIZE_UNDEFINED
 #endif
 
 /**
  * \def U_MALLOC_ATTR
  * Attribute to mark functions as malloc-like
  * @internal
  */
 #if defined(__GNUC__) && __GNUC__>=3
 #    define U_MALLOC_ATTR __attribute__ ((__malloc__))
 #else
 #    define U_MALLOC_ATTR
 #endif
 
 /**
  * \def U_ALLOC_SIZE_ATTR
  * Attribute to specify the size of the allocated buffer for malloc-like functions
  * @internal
  */
 #if (defined(__GNUC__) &&                                            \
         (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))) || \
         UPRV_HAS_ATTRIBUTE(alloc_size)
 #   define U_ALLOC_SIZE_ATTR(X) __attribute__ ((alloc_size(X)))
 #   define U_ALLOC_SIZE_ATTR2(X,Y) __attribute__ ((alloc_size(X,Y)))
 #else
 #   define U_ALLOC_SIZE_ATTR(X)
 #   define U_ALLOC_SIZE_ATTR2(X,Y)
 #endif
 
 /**
  * \def U_CPLUSPLUS_VERSION
  * 0 if no C++; 1, 11, 14, ... if C++.
  * Support for specific features cannot always be determined by the C++ version alone.
  * @internal
  */
 #ifdef U_CPLUSPLUS_VERSION
 #   if U_CPLUSPLUS_VERSION != 0 && !defined(__cplusplus)
 #       undef U_CPLUSPLUS_VERSION
 #       define U_CPLUSPLUS_VERSION 0
 #   endif
     /* Otherwise use the predefined value. */
 #elif !defined(__cplusplus)
 #   define U_CPLUSPLUS_VERSION 0
 #elif __cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
 #   define U_CPLUSPLUS_VERSION 17
 #elif __cplusplus >= 201402L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201402L)
 #   define U_CPLUSPLUS_VERSION 14
 #elif __cplusplus >= 201103L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201103L)
 #   define U_CPLUSPLUS_VERSION 11
 #else
     // C++98 or C++03
 #   define U_CPLUSPLUS_VERSION 1
 #endif
 
 /**
  * \def U_FALLTHROUGH
  * Annotate intentional fall-through between switch labels.
  * http://clang.llvm.org/docs/AttributeReference.html#fallthrough-clang-fallthrough
  * @internal
  */
 #ifndef __cplusplus
     // Not for C.
 #elif defined(U_FALLTHROUGH)
     // Use the predefined value.
 #elif defined(__clang__)
     // Test for compiler vs. feature separately.
     // Other compilers might choke on the feature test.
 #    if UPRV_HAS_CPP_ATTRIBUTE(clang::fallthrough) || \
              (UPRV_HAS_FEATURE(cxx_attributes) &&     \
              UPRV_HAS_WARNING("-Wimplicit-fallthrough"))
 #       define U_FALLTHROUGH [[clang::fallthrough]]
 #   endif
 #elif defined(__GNUC__) && (__GNUC__ >= 7)
 #   define U_FALLTHROUGH __attribute__((fallthrough))
 #endif
 
 #ifndef U_FALLTHROUGH
 #   define U_FALLTHROUGH
 #endif
 
 /** @} */
 
 /*===========================================================================*/
 /** @{ Character data types                                                  */
 /*===========================================================================*/
 
 /**
  * U_CHARSET_FAMILY is equal to this value when the platform is an ASCII based platform.
  * @stable ICU 2.0
  */
 #define U_ASCII_FAMILY 0
 
 /**
  * U_CHARSET_FAMILY is equal to this value when the platform is an EBCDIC based platform.
  * @stable ICU 2.0
  */
 #define U_EBCDIC_FAMILY 1
 
 /**
  * \def U_CHARSET_FAMILY
  *
  * <p>These definitions allow to specify the encoding of text
  * in the char data type as defined by the platform and the compiler.
  * It is enough to determine the code point values of "invariant characters",
  * which are the ones shared by all encodings that are in use
  * on a given platform.</p>
  *
  * <p>Those "invariant characters" should be all the uppercase and lowercase
  * latin letters, the digits, the space, and "basic punctuation".
  * Also, '\\n', '\\r', '\\t' should be available.</p>
  *
  * <p>The list of "invariant characters" is:<br>
  * \code
  *    A-Z  a-z  0-9  SPACE  "  %  &amp;  '  (  )  *  +  ,  -  .  /  :  ;  <  =  >  ?  _
  * \endcode
  * <br>
  * (52 letters + 10 numbers + 20 punc/sym/space = 82 total)</p>
  *
  * <p>This matches the IBM Syntactic Character Set (CS 640).</p>
  *
  * <p>In other words, all the graphic characters in 7-bit ASCII should
  * be safely accessible except the following:</p>
  *
  * \code
  *    '\' <backslash>
  *    '[' <left bracket>
  *    ']' <right bracket>
  *    '{' <left brace>
  *    '}' <right brace>
  *    '^' <circumflex>
  *    '~' <tilde>
  *    '!' <exclamation mark>
  *    '#' <number sign>
  *    '|' <vertical line>
  *    '$' <dollar sign>
  *    '@' <commercial at>
  *    '`' <grave accent>
  * \endcode
  * @stable ICU 2.0
  */
 #ifdef U_CHARSET_FAMILY
     /* Use the predefined value. */
 #elif U_PLATFORM == U_PF_OS390 && (!defined(__CHARSET_LIB) || !__CHARSET_LIB)
 #   define U_CHARSET_FAMILY U_EBCDIC_FAMILY
 #elif U_PLATFORM == U_PF_OS400 && !defined(__UTF32__)
 #   define U_CHARSET_FAMILY U_EBCDIC_FAMILY
 #else
 #   define U_CHARSET_FAMILY U_ASCII_FAMILY
 #endif
 
 /**
  * \def U_CHARSET_IS_UTF8
  *
  * Hardcode the default charset to UTF-8.
  *
  * If this is set to 1, then
  * - ICU will assume that all non-invariant char*, StringPiece, std::string etc.
  *   contain UTF-8 text, regardless of what the system API uses
  * - some ICU code will use fast functions like u_strFromUTF8()
  *   rather than the more general and more heavy-weight conversion API (ucnv.h)
  * - ucnv_getDefaultName() always returns "UTF-8"
  * - ucnv_setDefaultName() is disabled and will not change the default charset
  * - static builds of ICU are smaller
  * - more functionality is available with the UCONFIG_NO_CONVERSION build-time
  *   configuration option (see unicode/uconfig.h)
  * - the UCONFIG_NO_CONVERSION build option in uconfig.h is more usable
  *
  * @stable ICU 4.2
  * @see UCONFIG_NO_CONVERSION
  */
 #ifdef U_CHARSET_IS_UTF8
     /* Use the predefined value. */
 #elif U_PLATFORM_IS_LINUX_BASED || U_PLATFORM_IS_DARWIN_BASED || \
         U_PLATFORM == U_PF_EMSCRIPTEN
 #   define U_CHARSET_IS_UTF8 1
 #else
 #   define U_CHARSET_IS_UTF8 0
 #endif
 
 /** @} */
 
 /*===========================================================================*/
 /** @{ Information about wchar support                                       */
 /*===========================================================================*/
 
 /**
  * \def U_HAVE_WCHAR_H
  * Indicates whether <wchar.h> is available (1) or not (0). Set to 1 by default.
  *
  * @stable ICU 2.0
  */
 #ifdef U_HAVE_WCHAR_H
     /* Use the predefined value. */
 #elif U_PLATFORM == U_PF_ANDROID && __ANDROID_API__ < 9
     /*
      * Android before Gingerbread (Android 2.3, API level 9) did not support wchar_t.
      * The type and header existed, but the library functions did not work as expected.
      * The size of wchar_t was 1 but L"xyz" string literals had 32-bit units anyway.
      */
 #   define U_HAVE_WCHAR_H 0
 #else
 #   define U_HAVE_WCHAR_H 1
 #endif
 
 /**
  * \def U_SIZEOF_WCHAR_T
  * U_SIZEOF_WCHAR_T==sizeof(wchar_t)
  *
  * @stable ICU 2.0
  */
 #ifdef U_SIZEOF_WCHAR_T
     /* Use the predefined value. */
 #elif (U_PLATFORM == U_PF_ANDROID && __ANDROID_API__ < 9)
     /*
      * Classic Mac OS and Mac OS X before 10.3 (Panther) did not support wchar_t or wstring.
      * Newer Mac OS X has size 4.
      */
 #   define U_SIZEOF_WCHAR_T 1
 #elif U_PLATFORM_HAS_WIN32_API || U_PLATFORM == U_PF_CYGWIN
 #   define U_SIZEOF_WCHAR_T 2
 #elif U_PLATFORM == U_PF_AIX
     /*
      * AIX 6.1 information, section "Wide character data representation":
      * "... the wchar_t datatype is 32-bit in the 64-bit environment and
      * 16-bit in the 32-bit environment."
      * and
      * "All locales use Unicode for their wide character code values (process code),
      * except the IBM-eucTW codeset."
      */
 #   ifdef __64BIT__
 #       define U_SIZEOF_WCHAR_T 4
 #   else
 #       define U_SIZEOF_WCHAR_T 2
 #   endif
 #elif U_PLATFORM == U_PF_OS390
     /*
      * z/OS V1R11 information center, section "LP64 | ILP32":
      * "In 31-bit mode, the size of long and pointers is 4 bytes and the size of wchar_t is 2 bytes.
      * Under LP64, the size of long and pointer is 8 bytes and the size of wchar_t is 4 bytes."
      */
 #   ifdef _LP64
 #       define U_SIZEOF_WCHAR_T 4
 #   else
 #       define U_SIZEOF_WCHAR_T 2
 #   endif
 #elif U_PLATFORM == U_PF_OS400
 #   if defined(__UTF32__)
         /*
          * LOCALETYPE(*LOCALEUTF) is specified.
          * Wide-character strings are in UTF-32,
          * narrow-character strings are in UTF-8.
          */
 #       define U_SIZEOF_WCHAR_T 4
 #   elif defined(__UCS2__)
         /*
          * LOCALETYPE(*LOCALEUCS2) is specified.
          * Wide-character strings are in UCS-2,
          * narrow-character strings are in EBCDIC.
          */
 #       define U_SIZEOF_WCHAR_T 2
 #   else
         /*
          * LOCALETYPE(*CLD) or LOCALETYPE(*LOCALE) is specified.
          * Wide-character strings are in 16-bit EBCDIC,
          * narrow-character strings are in EBCDIC.
          */
 #       define U_SIZEOF_WCHAR_T 2
 #   endif
 #else
 #   define U_SIZEOF_WCHAR_T 4
 #endif
 
 #ifndef U_HAVE_WCSCPY
 #define U_HAVE_WCSCPY U_HAVE_WCHAR_H
 #endif
 
 /** @} */
 
 /**
  * \def U_HAVE_CHAR16_T
  * Defines whether the char16_t type is available for UTF-16
  * and u"abc" UTF-16 string literals are supported.
  * This is a new standard type and standard string literal syntax in C++11
  * but has been available in some compilers before.
  * @internal
  */
 #ifdef U_HAVE_CHAR16_T
     /* Use the predefined value. */
 #else
     /*
      * Notes:
      * C++11 and C11 require support for UTF-16 literals
      * Doesn't work on Mac C11 (see workaround in ptypes.h)
      * or Cygwin less than 3.5.
      */
 #   if defined(__cplusplus)
 #       define U_HAVE_CHAR16_T 1
 #   elif U_PLATFORM_IS_DARWIN_BASED || (U_PLATFORM == U_PF_CYGWIN && CYGWIN_VERSION_DLL_MAJOR < 3005)
 #       define U_HAVE_CHAR16_T 0
 #   else
         // conformant C11
 #       define U_HAVE_CHAR16_T 1
 #   endif
 #endif
 
 /**
  * @{
  * \def U_DECLARE_UTF16
  * Do not use this macro because it is not defined on all platforms.
  * In C++, use std::u16string_view literals, see the UNICODE_STRING docs.
  * In C, use u"UTF-16 literals".
  * See also the public U_STRING_DECL macro.
  * @internal
  */
 #ifdef U_DECLARE_UTF16
     /* Use the predefined value. */
 #elif U_HAVE_CHAR16_T \
     || (defined(__xlC__) && defined(__IBM_UTF_LITERAL) && U_SIZEOF_WCHAR_T != 2) \
     || (defined(__HP_aCC) && __HP_aCC >= 035000) \
     || (defined(__HP_cc) && __HP_cc >= 111106) \
     || (defined(U_IN_DOXYGEN))
 #   define U_DECLARE_UTF16(string) u ## string
 #elif U_SIZEOF_WCHAR_T == 2 \
     && (U_CHARSET_FAMILY == 0 || (U_PF_OS390 <= U_PLATFORM && U_PLATFORM <= U_PF_OS400 && defined(__UCS2__)))
 #   define U_DECLARE_UTF16(string) L ## string
 #else
     /* Leave U_DECLARE_UTF16 undefined. See unistr.h. */
 #endif
 
 /** @} */
 
 /*===========================================================================*/
 /** @{ Symbol import-export control                                          */
 /*===========================================================================*/
 
 #ifdef U_EXPORT
     /* Use the predefined value. */
 #elif defined(U_STATIC_IMPLEMENTATION)
 #   define U_EXPORT
 #elif defined(_MSC_VER) || (UPRV_HAS_DECLSPEC_ATTRIBUTE(__dllexport__) && \
                             UPRV_HAS_DECLSPEC_ATTRIBUTE(__dllimport__))
 #   define U_EXPORT __declspec(dllexport)
 #elif defined(__GNUC__) || defined(__open_xl__)
 #   define U_EXPORT __attribute__((visibility("default")))
 #elif (defined(__SUNPRO_CC) && __SUNPRO_CC >= 0x550) \
    || (defined(__SUNPRO_C) && __SUNPRO_C >= 0x550) 
 #   define U_EXPORT __global
 /*#elif defined(__HP_aCC) || defined(__HP_cc)
 #   define U_EXPORT __declspec(dllexport)*/
 #else
 #   define U_EXPORT
 #endif
 
 /* U_CALLCONV is related to U_EXPORT2 */
 #ifdef U_EXPORT2
     /* Use the predefined value. */
 #elif defined(_MSC_VER)
 #   define U_EXPORT2 __cdecl
 #else
 #   define U_EXPORT2
 #endif
 
 #ifdef U_IMPORT
     /* Use the predefined value. */
 #elif defined(_MSC_VER) || (UPRV_HAS_DECLSPEC_ATTRIBUTE(__dllexport__) && \
                             UPRV_HAS_DECLSPEC_ATTRIBUTE(__dllimport__))
     /* Windows needs to export/import data. */
 #   define U_IMPORT __declspec(dllimport)
 #else
 #   define U_IMPORT 
 #endif
 
 /**
  * \def U_HIDDEN
  * This is used to mark internal structs declared within external classes,
  * to prevent the internal structs from having the same visibility as the
  * class within which they are declared. 
  * @internal
  */
 #ifdef U_HIDDEN
     /* Use the predefined value. */
 #elif defined(__GNUC__) || defined(__open_xl__)
 #   define U_HIDDEN __attribute__((visibility("hidden")))
 #else
 #   define U_HIDDEN 
 #endif
 
 /**
  * \def U_CALLCONV
  * Similar to U_CDECL_BEGIN/U_CDECL_END, this qualifier is necessary
  * in callback function typedefs to make sure that the calling convention
  * is compatible.
  *
  * This is only used for non-ICU-API functions.
  * When a function is a public ICU API,
  * you must use the U_CAPI and U_EXPORT2 qualifiers.
  *
  * Please note, you need to use U_CALLCONV after the *.
  *
  * NO : "static const char U_CALLCONV *func( . . . )"
  * YES: "static const char* U_CALLCONV func( . . . )"
  *
  * @stable ICU 2.0
  */
 #if U_PLATFORM == U_PF_OS390 && defined(__cplusplus)
 #    define U_CALLCONV __cdecl
 #else
 #    define U_CALLCONV U_EXPORT2
 #endif
 
 /**
  * \def U_CALLCONV_FPTR
  * Similar to U_CALLCONV, but only used on function pointers.
  * @internal
  */
 #if U_PLATFORM == U_PF_OS390 && defined(__cplusplus)
 #    define U_CALLCONV_FPTR U_CALLCONV
 #else
 #    define U_CALLCONV_FPTR
 #endif
 /** @} */
 
 #endif  // _PLATFORM_H

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