+/**
+ * \def U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
+ * Nearly all CPUs and compilers implement a right-shift of a signed integer
+ * as an Arithmetic Shift Right which copies the sign bit (the Most Significant Bit (MSB))
+ * into the vacated bits (sign extension).
+ * For example, (int32_t)0xfff5fff3>>4 becomes 0xffff5fff and -1>>1=-1.
+ *
+ * This can be useful for storing a signed value in the upper bits
+ * and another bit field in the lower bits.
+ * The signed value can be retrieved by simple right-shifting.
+ *
+ * This is consistent with the Java language.
+ *
+ * However, the C standard allows compilers to implement a right-shift of a signed integer
+ * as a Logical Shift Right which copies a 0 into the vacated bits.
+ * For example, (int32_t)0xfff5fff3>>4 becomes 0x0fff5fff and -1>>1=0x7fffffff.
+ *
+ * Code that depends on the natural behavior should be guarded with this macro,
+ * with an alternate path for unusual platforms.
+ * @internal
+ */
+#ifdef U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC
+ /* Use the predefined value. */
+#else
+ /*
+ * Nearly all CPUs & compilers implement a right-shift of a signed integer
+ * as an Arithmetic Shift Right (with sign extension).
+ */
+# define U_SIGNED_RIGHT_SHIFT_IS_ARITHMETIC 1
+#endif
+
+/** Define this to 1 if your platform supports IEEE 754 floating point,
+ to 0 if it does not. */
+#ifndef IEEE_754
+# define IEEE_754 1
+#endif
+
+/**
+ * uintptr_t is an optional part of the standard definitions in stdint.h.
+ * The opengroup.org documentation for stdint.h says
+ * "On XSI-conformant systems, the intptr_t and uintptr_t types are required;
+ * otherwise, they are optional."
+ * We assume that when uintptr_t is defined, UINTPTR_MAX is defined as well.
+ *
+ * Do not use ptrdiff_t since it is signed. size_t is unsigned.
+ */
+/* TODO: This check fails on some z environments. Filed a ticket #9357 for this. */
+#if !defined(__intptr_t_defined) && !defined(UINTPTR_MAX) && (U_PLATFORM != U_PF_OS390)
+typedef size_t uintptr_t;
+#endif
+
+/*===========================================================================*/
+/** @{ Information about POSIX support */
+/*===========================================================================*/
+
+#ifdef U_HAVE_NL_LANGINFO_CODESET
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API || U_PLATFORM == U_PF_ANDROID || U_PLATFORM == U_PF_QNX
+# define U_HAVE_NL_LANGINFO_CODESET 0
+#else
+# define U_HAVE_NL_LANGINFO_CODESET 1
+#endif
+
+#ifdef U_NL_LANGINFO_CODESET
+ /* Use the predefined value. */
+#elif !U_HAVE_NL_LANGINFO_CODESET
+# define U_NL_LANGINFO_CODESET -1
+#elif U_PLATFORM == U_PF_OS400
+ /* not defined */
+#else
+# define U_NL_LANGINFO_CODESET CODESET
+#endif
+
+#if defined(U_TZSET) || defined(U_HAVE_TZSET)
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+ // UWP doesn't support tzset or environment variables for tz
+#if U_PLATFORM_HAS_WINUWP_API == 0
+# define U_TZSET _tzset
+#endif
+#elif U_PLATFORM == U_PF_OS400
+ /* not defined */
+#else
+# define U_TZSET tzset
+#endif
+
+#if defined(U_TIMEZONE) || defined(U_HAVE_TIMEZONE)
+ /* Use the predefined value. */
+#elif U_PLATFORM == U_PF_ANDROID
+# define U_TIMEZONE timezone
+#elif defined(__UCLIBC__)
+ // uClibc does not have __timezone or _timezone.
+#elif defined(_NEWLIB_VERSION)
+# define U_TIMEZONE _timezone
+#elif defined(__GLIBC__)
+ // glibc
+# define U_TIMEZONE __timezone
+#elif U_PLATFORM_IS_LINUX_BASED
+ // not defined
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+# define U_TIMEZONE _timezone
+#elif U_PLATFORM == U_PF_BSD && !defined(__NetBSD__)
+ /* not defined */
+#elif U_PLATFORM == U_PF_OS400
+ /* not defined */
+#elif U_PLATFORM == U_PF_IPHONE
+ /* not defined */
+#else
+# define U_TIMEZONE timezone
+#endif
+
+#if defined(U_TZNAME) || defined(U_HAVE_TZNAME)
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+ /* not usable on all windows platforms */
+#if U_PLATFORM_HAS_WINUWP_API == 0
+# define U_TZNAME _tzname
+#endif
+#elif U_PLATFORM == U_PF_OS400
+ /* not defined */
+#else
+# define U_TZNAME tzname
+#endif
+
+#ifdef U_HAVE_MMAP
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+# define U_HAVE_MMAP 0
+#else
+# define U_HAVE_MMAP 1
+#endif
+
+#ifdef U_HAVE_POPEN
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+# define U_HAVE_POPEN 0
+#elif U_PLATFORM == U_PF_OS400
+# define U_HAVE_POPEN 0
+#else
+# define U_HAVE_POPEN 1
+#endif
+
+/**
+ * \def U_HAVE_DIRENT_H
+ * Defines whether dirent.h is available.
+ * @internal
+ */
+#ifdef U_HAVE_DIRENT_H
+ /* Use the predefined value. */
+#elif U_PLATFORM_USES_ONLY_WIN32_API
+# define U_HAVE_DIRENT_H 0
+#else
+# define U_HAVE_DIRENT_H 1
+#endif
+
+/** @} */
+
+/*===========================================================================*/
+/** @{ GCC built in functions for atomic memory operations */
+/*===========================================================================*/
+
+/**
+ * \def U_HAVE_GCC_ATOMICS
+ * @internal
+ */
+#ifdef U_HAVE_GCC_ATOMICS
+ /* Use the predefined value. */
+#elif U_PLATFORM == U_PF_MINGW
+ #define U_HAVE_GCC_ATOMICS 0
+#elif U_GCC_MAJOR_MINOR >= 404 || defined(__clang__)
+ /* TODO: Intel icc and IBM xlc on AIX also support gcc atomics. (Intel originated them.)
+ * Add them for these compilers.
+ * Note: Clang sets __GNUC__ defines for version 4.2, so misses the 4.4 test here.
+ */
+# define U_HAVE_GCC_ATOMICS 1
+#else
+# define U_HAVE_GCC_ATOMICS 0
+#endif
+
+/** @} */
+
+/**
+ * \def U_HAVE_STD_ATOMICS
+ * Defines whether to use the C++11 std::atomic functions.
+ * If false, ICU will fall back to compiler or platform specific alternatives.
+ * Note: support for these fall back options for atomics will be removed in a future version
+ * of ICU, and the use of C++ 11 atomics will be required.
+ * @internal
+ */
+#ifdef U_HAVE_STD_ATOMICS
+ /* Use the predefined value. */
+#else
+# define U_HAVE_STD_ATOMICS 1
+#endif
+
+/**
+ * \def U_HAVE_CLANG_ATOMICS
+ * Defines whether Clang c11 style built-in atomics are available.
+ * These are used in preference to gcc atomics when both are available.
+ */
+#ifdef U_HAVE_CLANG_ATOMICS
+ /* Use the predefined value. */
+#elif __has_builtin(__c11_atomic_load) && \
+ __has_builtin(__c11_atomic_store) && \
+ __has_builtin(__c11_atomic_fetch_add) && \
+ __has_builtin(__c11_atomic_fetch_sub)
+# define U_HAVE_CLANG_ATOMICS 1
+#else
+# define U_HAVE_CLANG_ATOMICS 0
+#endif
+
+
+/**
+ * \def U_HAVE_STD_MUTEX
+ * Defines whether to use the C++11 std::mutex functions.
+ * If false, ICU will fall back to compiler or platform specific alternatives.
+ * std::mutex is preferred, and used by default unless this setting is overridden.
+ * Note: support for other options for mutexes will be removed in a future version
+ * of ICU, and the use of std::mutex will be required.
+ * @internal
+ */
+#ifdef U_HAVE_STD_MUTEX
+ /* Use the predefined value. */
+#else
+# define U_HAVE_STD_MUTEX 1
+#endif
+
+/*===========================================================================*/
+/** @{ Programs used by ICU code */
+/*===========================================================================*/
+
+/**
+ * \def U_MAKE_IS_NMAKE
+ * Defines whether the "make" program is Windows nmake.
+ */
+#ifdef U_MAKE_IS_NMAKE
+ /* Use the predefined value. */
+#elif U_PLATFORM == U_PF_WINDOWS
+# define U_MAKE_IS_NMAKE 1
+#else
+# define U_MAKE_IS_NMAKE 0
+#endif
+
+/** @} */
+
projects / apple / icu.git / blobdiff