From f793ad55e97004a422ab411e7717e1d57b7b99e9 Mon Sep 17 00:00:00 2001
From: Andy Heninger <andy.heninger@gmail.com>
Date: Tue, 23 Jul 2019 14:54:57 -0700
Subject: [PATCH] ICU-20729 Remove obsolete U_HAVE_STD_ATOMICS and similar
 @internal macros.

---
 icu4c/source/common/putilimp.h | 70 ----------------------------------
 1 file changed, 70 deletions(-)

diff --git a/icu4c/source/common/putilimp.h b/icu4c/source/common/putilimp.h
index 73defd9d072..d9c90cf4e75 100644
--- a/icu4c/source/common/putilimp.h
+++ b/icu4c/source/common/putilimp.h
@@ -178,76 +178,6 @@ typedef size_t uintptr_t;
 
 /** @} */
 
-/*===========================================================================*/
-/** @{ 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                                             */
 /*===========================================================================*/