Squashed 'third_party/boostorg/atomic/' content from commit 19eecf8
Change-Id: I4723a39ab79969b4c0d7b7e67a4143c4e02992ed
git-subtree-dir: third_party/boostorg/atomic
git-subtree-split: 19eecf893c665410de63ab6ebb8549f405703e80
diff --git a/include/boost/atomic/detail/config.hpp b/include/boost/atomic/detail/config.hpp
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+/*
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * Copyright (c) 2012 Hartmut Kaiser
+ * Copyright (c) 2014 Andrey Semashev
+ */
+/*!
+ * \file atomic/detail/config.hpp
+ *
+ * This header defines configuraion macros for Boost.Atomic
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_CONFIG_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_CONFIG_HPP_INCLUDED_
+
+#include <boost/config.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+#if defined(__CUDACC__)
+// nvcc does not support alternatives ("q,m") in asm statement constraints
+#define BOOST_ATOMIC_DETAIL_NO_ASM_CONSTRAINT_ALTERNATIVES
+// nvcc does not support condition code register ("cc") clobber in asm statements
+#define BOOST_ATOMIC_DETAIL_NO_ASM_CLOBBER_CC
+#endif
+
+#if !defined(BOOST_ATOMIC_DETAIL_NO_ASM_CLOBBER_CC)
+#define BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC "cc"
+#define BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA "cc",
+#else
+#define BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC
+#define BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA
+#endif
+
+#if (defined(__i386__) || defined(__x86_64__)) && (defined(__clang__) || (defined(BOOST_GCC) && (BOOST_GCC+0) < 40500) || defined(__SUNPRO_CC))
+// This macro indicates that the compiler does not support allocating eax:edx or rax:rdx register pairs ("A") in asm blocks
+#define BOOST_ATOMIC_DETAIL_X86_NO_ASM_AX_DX_PAIRS
+#endif
+
+#if defined(__i386__) && (defined(__PIC__) || defined(__PIE__)) && !(defined(__clang__) || (defined(BOOST_GCC) && (BOOST_GCC+0) >= 50100))
+// This macro indicates that asm blocks should preserve ebx value unchanged. Some compilers are able to maintain ebx themselves
+// around the asm blocks. For those compilers we don't need to save/restore ebx in asm blocks.
+#define BOOST_ATOMIC_DETAIL_X86_ASM_PRESERVE_EBX
+#endif
+
+#if defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
+#if !(defined(BOOST_LIBSTDCXX11) && (BOOST_LIBSTDCXX_VERSION+0) >= 40700) /* libstdc++ from gcc >= 4.7 in C++11 mode */
+// This macro indicates that there is not even a basic <type_traits> standard header that is sufficient for most Boost.Atomic needs.
+#define BOOST_ATOMIC_DETAIL_NO_CXX11_BASIC_HDR_TYPE_TRAITS
+#endif
+#endif // defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
+
+// Enable pointer/reference casts between storage and value when possible.
+// Note: Despite that MSVC does not employ strict aliasing rules for optimizations
+// and does not require an explicit markup for types that may alias, we still don't
+// enable the optimization for this compiler because at least MSVC-8 and 9 are known
+// to generate broken code sometimes when casts are used.
+#define BOOST_ATOMIC_DETAIL_MAY_ALIAS BOOST_MAY_ALIAS
+#if !defined(BOOST_NO_MAY_ALIAS)
+#define BOOST_ATOMIC_DETAIL_STORAGE_TYPE_MAY_ALIAS
+#endif
+
+#if defined(__GCC_ASM_FLAG_OUTPUTS__)
+// The compiler supports output values in flag registers.
+// See: https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html, Section 6.44.3.
+#define BOOST_ATOMIC_DETAIL_ASM_HAS_FLAG_OUTPUTS
+#endif
+
+#if defined(__has_builtin)
+#if __has_builtin(__builtin_constant_p)
+#define BOOST_ATOMIC_DETAIL_IS_CONSTANT(x) __builtin_constant_p(x)
+#endif
+#elif defined(__GNUC__)
+#define BOOST_ATOMIC_DETAIL_IS_CONSTANT(x) __builtin_constant_p(x)
+#endif
+
+#if !defined(BOOST_ATOMIC_DETAIL_IS_CONSTANT)
+#define BOOST_ATOMIC_DETAIL_IS_CONSTANT(x) false
+#endif
+
+#if (defined(__BYTE_ORDER__) && defined(__FLOAT_WORD_ORDER__) && (__BYTE_ORDER__+0) == (__FLOAT_WORD_ORDER__+0)) ||\
+ defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64)
+// This macro indicates that integer and floating point endianness is the same
+#define BOOST_ATOMIC_DETAIL_INT_FP_ENDIAN_MATCH
+#endif
+
+// Deprecated symbols markup
+#if !defined(BOOST_ATOMIC_DETAIL_DEPRECATED) && defined(_MSC_VER)
+#if (_MSC_VER) >= 1400
+#define BOOST_ATOMIC_DETAIL_DEPRECATED(msg) __declspec(deprecated(msg))
+#else
+// MSVC 7.1 only supports the attribute without a message
+#define BOOST_ATOMIC_DETAIL_DEPRECATED(msg) __declspec(deprecated)
+#endif
+#endif
+
+#if !defined(BOOST_ATOMIC_DETAIL_DEPRECATED) && defined(__has_extension)
+#if __has_extension(attribute_deprecated_with_message)
+#define BOOST_ATOMIC_DETAIL_DEPRECATED(msg) __attribute__((deprecated(msg)))
+#endif
+#endif
+
+// gcc since 4.5 supports deprecated attribute with a message; older versions support the attribute without a message.
+// Oracle Studio 12.4 supports deprecated attribute with a message; this is the first release that supports the attribute.
+#if !defined(BOOST_ATOMIC_DETAIL_DEPRECATED) && (\
+ (defined(__GNUC__) && ((__GNUC__ + 0) * 100 + (__GNUC_MINOR__ + 0)) >= 405) ||\
+ (defined(__SUNPRO_CC) && (__SUNPRO_CC + 0) >= 0x5130))
+#define BOOST_ATOMIC_DETAIL_DEPRECATED(msg) __attribute__((deprecated(msg)))
+#endif
+
+#if !defined(BOOST_ATOMIC_DETAIL_DEPRECATED) && __cplusplus >= 201402
+#define BOOST_ATOMIC_DETAIL_DEPRECATED(msg) [[deprecated(msg)]]
+#endif
+
+#if !defined(BOOST_ATOMIC_DETAIL_DEPRECATED) && defined(__GNUC__)
+#define BOOST_ATOMIC_DETAIL_DEPRECATED(msg) __attribute__((deprecated))
+#endif
+
+#if !defined(BOOST_ATOMIC_DETAIL_DEPRECATED) && defined(__has_attribute)
+#if __has_attribute(deprecated)
+#define BOOST_ATOMIC_DETAIL_DEPRECATED(msg) __attribute__((deprecated))
+#endif
+#endif
+
+#if !defined(BOOST_ATOMIC_DETAIL_DEPRECATED)
+#define BOOST_ATOMIC_DETAIL_DEPRECATED(msg)
+#endif
+
+// In Boost.Atomic 1.67 we changed (op)_and_test methods to return true when the result is non-zero. This would be more consistent
+// with the other names used in Boost.Atomic and the C++ standard library. Since the methods were announced as experimental and
+// the previous behavior was released only in Boost 1.66, it was decided to change the result without changing the method names.
+// By defining BOOST_ATOMIC_HIGHLIGHT_OP_AND_TEST the user has a way to highlight all uses of the affected functions so
+// that it is easier to find and update the affected code (which is typically adding or removing negation of the result). This
+// highlighting functionality is a temporary measure to help users upgrade from Boost 1.66 to newer Boost versions. It will
+// be removed eventually.
+//
+// More info at:
+// https://github.com/boostorg/atomic/issues/11
+// http://boost.2283326.n4.nabble.com/atomic-op-and-test-naming-tc4701445.html
+#if defined(BOOST_ATOMIC_HIGHLIGHT_OP_AND_TEST)
+#define BOOST_ATOMIC_DETAIL_HIGHLIGHT_OP_AND_TEST BOOST_ATOMIC_DETAIL_DEPRECATED("Boost.Atomic 1.67 has changed (op)_and_test result to the opposite. The functions now return true when the result is non-zero. Please, verify your use of the operation and undefine BOOST_ATOMIC_HIGHLIGHT_OP_AND_TEST.")
+#else
+#define BOOST_ATOMIC_DETAIL_HIGHLIGHT_OP_AND_TEST
+#endif
+
+#endif // BOOST_ATOMIC_DETAIL_CONFIG_HPP_INCLUDED_