20 files changed, 421 insertions, 64 deletions
diff --git a/boost/config/compiler/borland.hpp b/boost/config/compiler/borland.hpp
index 6190e390e6..cb164f8f2a 100644
--- a/boost/config/compiler/borland.hpp
+++ b/boost/config/compiler/borland.hpp
@@ -239,6 +239,9 @@
 #if !defined(__cpp_fold_expressions) || (__cpp_fold_expressions < 201603)
 #  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
 
 #if __BORLANDC__ >= 0x590
 #  define BOOST_HAS_TR1_HASH
diff --git a/boost/config/compiler/clang.hpp b/boost/config/compiler/clang.hpp
index da736bc4b4..3d893c689a 100644
--- a/boost/config/compiler/clang.hpp
+++ b/boost/config/compiler/clang.hpp
@@ -294,6 +294,10 @@
 #  define BOOST_NO_CXX17_STRUCTURED_BINDINGS
 #endif
 
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
+
 // Clang 3.9+ in c++1z
 #if !__has_cpp_attribute(fallthrough) || __cplusplus < 201406L
 #  define BOOST_NO_CXX17_INLINE_VARIABLES
diff --git a/boost/config/compiler/codegear.hpp b/boost/config/compiler/codegear.hpp
index 44ca8428e4..c2cfe15c64 100644
--- a/boost/config/compiler/codegear.hpp
+++ b/boost/config/compiler/codegear.hpp
@@ -167,6 +167,10 @@
 #  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif
 
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
+
 //
 // TR1 macros:
 //
diff --git a/boost/config/compiler/common_edg.hpp b/boost/config/compiler/common_edg.hpp
index d49ceb68e2..88aba9ac8f 100644
--- a/boost/config/compiler/common_edg.hpp
+++ b/boost/config/compiler/common_edg.hpp
@@ -149,6 +149,10 @@
 #  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif
 
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
+
 #ifdef c_plusplus
 // EDG has "long long" in non-strict mode
 // However, some libraries have insufficient "long long" support
diff --git a/boost/config/compiler/cray.hpp b/boost/config/compiler/cray.hpp
index 5f81078170..412ef9efa5 100644
--- a/boost/config/compiler/cray.hpp
+++ b/boost/config/compiler/cray.hpp
@@ -1,68 +1,227 @@
-//  (C) Copyright John Maddock 2011.
-//  (C) Copyright Cray, Inc. 2013
+//  Copyright 2011 John Maddock
+//  Copyright 2013, 2017-2018 Cray, Inc.
 //  Use, modification and distribution are subject to 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)
 
 //  See http://www.boost.org for most recent version.
 
-//  Greenhills C compiler setup:
+// Cray C++ compiler setup.
+//
+// There are a few parameters that affect the macros defined in this file:
+//
+// - What version of CCE (Cray Compiling Environment) are we running? This
+//   comes from the '_RELEASE_MAJOR', '_RELEASE_MINOR', and
+//   '_RELEASE_PATCHLEVEL' macros.
+// - What C++ standards conformance level are we using (e.g. '-h
+//   std=c++14')? This comes from the '__cplusplus' macro.
+// - Are we using GCC extensions ('-h gnu' or '-h nognu')? If we have '-h
+//   gnu' then CCE emulates GCC, and the macros '__GNUC__',
+//   '__GNUC_MINOR__', and '__GNUC_PATCHLEVEL__' are defined.
+//
+// This file is organized as follows:
+//
+// - Verify that the combination of parameters listed above is supported.
+//   If we have an unsupported combination, we abort with '#error'.
+// - Establish baseline values for all Boost macros.
+// - Apply changes to the baseline macros based on compiler version. These
+//   changes are cummulative so each version section only describes the
+//   changes since the previous version.
+//   - Within each version section, we may also apply changes based on
+//     other parameters (i.e. C++ standards conformance level and GCC
+//     extensions).
+//
+// To test changes to this file:
+//
+// ```
+// module load cce/8.6.5 # Pick the version you want to test.
+// cd boost/libs/config/test/all
+// b2 -j 8 toolset=cray cxxstd=03 cxxstd=11 cxxstd=14 cxxstd-dialect=gnu linkflags=-lrt
+// ```
+// Note: Using 'cxxstd-dialect=iso' is not supported at this time (the
+// tests run, but many tests fail).
+//
+// Note: 'linkflags=-lrt' is needed in Cray Linux Environment. Otherwise
+// you get an 'undefined reference to clock_gettime' error.
+//
+// Note: If a test '*_fail.cpp' file compiles, but fails to run, then it is
+// reported as a defect. However, this is not actually a defect. This is an
+// area where the test system is somewhat broken. Tests that are failing
+// because of this problem are noted in the comments.
+//
+// Pay attention to the macro definitions for the macros you wish to
+// modify. For example, only macros categorized as compiler macros should
+// appear in this file; platform macros should not appear in this file.
+// Also, some macros have to be defined to specific values; it is not
+// always enough to define or undefine a macro.
+//
+// Macro definitions are available in the source code at:
+//
+// `boost/libs/config/doc/html/boost_config/boost_macro_reference.html`
+//
+// Macro definitions are also available online at:
+//
+// http://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html
+//
+// Typically, if you enable a feature, and the tests pass, then you have
+// nothing to worry about. However, it's sometimes hard to figure out if a
+// disabled feature needs to stay disabled. To get a list of disabled
+// features, run 'b2' in 'boost/libs/config/checks'. These are the macros
+// you should pay attention to (in addition to macros that cause test
+// failures).
 
-#define BOOST_COMPILER "Cray C version " BOOST_STRINGIZE(_RELEASE)
+////
+//// Front matter
+////
 
-#if _RELEASE_MAJOR < 8
-#  error "Boost is not configured for Cray compilers prior to version 8, please try the configure script."
+// In a developer build of the Cray compiler (i.e. a compiler built by a
+// Cray employee), the release patch level is reported as "x". This gives
+// versions that look like e.g. "8.6.x".
+//
+// To accomplish this, the the Cray compiler preprocessor inserts:
+//
+// #define _RELEASE_PATCHLEVEL x
+//
+// If we are using a developer build of the compiler, we want to use the
+// configuration macros for the most recent patch level of the release. To
+// accomplish this, we'll pretend that _RELEASE_PATCHLEVEL is 99.
+//
+// However, it's difficult to detect if _RELEASE_PATCHLEVEL is x. We must
+// consider that the x will be expanded if x is defined as a macro
+// elsewhere. For example, imagine if someone put "-D x=3" on the command
+// line, and _RELEASE_PATCHLEVEL is x. Then _RELEASE_PATCHLEVEL would
+// expand to 3, and we could not distinguish it from an actual
+// _RELEASE_PATCHLEVEL of 3. This problem only affects developer builds; in
+// production builds, _RELEASE_PATCHLEVEL is always an integer.
+//
+// IMPORTANT: In developer builds, if x is defined as a macro, you will get
+// an incorrect configuration. The behavior in this case is undefined.
+//
+// Even if x is not defined, we have to use some trickery to detect if
+// _RELEASE_PATCHLEVEL is x. First we define BOOST_CRAY_x to some arbitrary
+// magic value, 9867657. Then we use BOOST_CRAY_APPEND to append the
+// expanded value of _RELEASE_PATCHLEVEL to the string "BOOST_CRAY_".
+//
+// - If _RELEASE_PATCHLEVEL is undefined, we get "BOOST_CRAY_".
+// - If _RELEASE_PATCHLEVEL is 5, we get "BOOST_CRAY_5".
+// - If _RELEASE_PATCHLEVEL is x (and x is not defined) we get
+//   "BOOST_CRAY_x":
+//
+// Then we check if BOOST_CRAY_x is equal to the output of
+// BOOST_CRAY_APPEND. In other words, the output of BOOST_CRAY_APPEND is
+// treated as a macro name, and expanded again. If we can safely assume
+// that BOOST_CRAY_ is not a macro defined as our magic number, and
+// BOOST_CRAY_5 is not a macro defined as our magic number, then the only
+// way the equality test can pass is if _RELEASE_PATCHLEVEL expands to x.
+//
+// So, that is how we detect if we are using a developer build of the Cray
+// compiler.
+
+#define BOOST_CRAY_x 9867657 // Arbitrary number
+#define BOOST_CRAY_APPEND(MACRO) BOOST_CRAY_APPEND_INTERNAL(MACRO)
+#define BOOST_CRAY_APPEND_INTERNAL(MACRO) BOOST_CRAY_##MACRO
+
+#if BOOST_CRAY_x == BOOST_CRAY_APPEND(_RELEASE_PATCHLEVEL)
+
+    // This is a developer build.
+    //
+    // - _RELEASE_PATCHLEVEL is defined as x, and x is not defined as a macro.
+
+    // Pretend _RELEASE_PATCHLEVEL is 99, so we get the configuration for the
+    // most recent patch level in this release.
+
+    #define BOOST_CRAY_VERSION (_RELEASE_MAJOR * 10000 + _RELEASE_MINOR * 100 + 99)
+
+#else
+
+    // This is a production build.
+    //
+    // _RELEASE_PATCHLEVEL is not defined as x, or x is defined as a macro.
+
+    #define BOOST_CRAY_VERSION (_RELEASE_MAJOR * 10000 + _RELEASE_MINOR * 100 + _RELEASE_PATCHLEVEL)
+
+#endif // BOOST_CRAY_x == BOOST_CRAY_APPEND(_RELEASE_PATCHLEVEL)
+
+#undef BOOST_CRAY_APPEND_INTERNAL
+#undef BOOST_CRAY_APPEND
+#undef BOOST_CRAY_x
+
+
+#ifdef __GNUC__
+#   define BOOST_GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
 #endif
 
+#ifndef BOOST_COMPILER
+#   define BOOST_COMPILER "Cray C++ version " BOOST_STRINGIZE(_RELEASE_MAJOR) "." BOOST_STRINGIZE(_RELEASE_MINOR) "." BOOST_STRINGIZE(_RELEASE_PATCHLEVEL)
+#endif
+
+// Since the Cray compiler defines '__GNUC__', we have to emulate some
+// additional GCC macros in order to make everything work.
 //
-// Check this is a recent EDG based compiler, otherwise we don't support it here:
-//
-#ifndef __EDG_VERSION__
+// FIXME: Perhaps Cray should fix the compiler to define these additional
+// macros for GCC emulation?
+
+#if __cplusplus >= 201103L && defined(__GNUC__) && !defined(__GXX_EXPERIMENTAL_CXX0X__)
+#   define __GXX_EXPERIMENTAL_CXX0X__ 1
+#endif
+
+////
+//// Parameter validation
+////
+
+// FIXME: Do we really need to support compilers before 8.5? Do they pass
+// the Boost.Config tests?
+
+#if BOOST_CRAY_VERSION < 80000
+#  error "Boost is not configured for Cray compilers prior to version 8, please try the configure script."
+#endif
+
+// We only support recent EDG based compilers.
+
+#ifndef __EDG__
 #  error "Unsupported Cray compiler, please try running the configure script."
 #endif
 
-#if _RELEASE_MINOR < 5 || __cplusplus < 201100
+////
+//// Baseline values
+////
+
 #include <boost/config/compiler/common_edg.hpp>
 
-//
-//
-#define BOOST_NO_CXX11_STATIC_ASSERT
+#define BOOST_HAS_NRVO
+#define BOOST_NO_COMPLETE_VALUE_INITIALIZATION
 #define BOOST_NO_CXX11_AUTO_DECLARATIONS
 #define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
-#define BOOST_HAS_NRVO
-#define BOOST_NO_CXX11_VARIADIC_MACROS
-#define BOOST_NO_CXX11_VARIADIC_TEMPLATES
-#define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
-#define BOOST_NO_CXX11_UNICODE_LITERALS
-#define BOOST_NO_TWO_PHASE_NAME_LOOKUP
-#define BOOST_HAS_NRVO
-#define BOOST_NO_CXX11_TEMPLATE_ALIASES
-#define BOOST_NO_CXX11_STATIC_ASSERT
-#define BOOST_NO_SFINAE_EXPR
-#define BOOST_NO_CXX11_SFINAE_EXPR
-#define BOOST_NO_CXX11_SCOPED_ENUMS
-#define BOOST_NO_CXX11_RVALUE_REFERENCES
-#define BOOST_NO_CXX11_RANGE_BASED_FOR
-#define BOOST_NO_CXX11_RAW_LITERALS
-#define BOOST_NO_CXX11_NULLPTR
-#define BOOST_NO_CXX11_NOEXCEPT
+#define BOOST_NO_CXX11_CHAR16_T
+#define BOOST_NO_CXX11_CHAR32_T
+#define BOOST_NO_CXX11_CONSTEXPR
+#define BOOST_NO_CXX11_DECLTYPE
+#define BOOST_NO_CXX11_DECLTYPE_N3276
+#define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
+#define BOOST_NO_CXX11_DELETED_FUNCTIONS
+#define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
+#define BOOST_NO_CXX11_FINAL
+#define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
 #define BOOST_NO_CXX11_LAMBDAS
 #define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
-#define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
-#define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
-#define BOOST_NO_CXX11_DELETED_FUNCTIONS
-#define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
-#define BOOST_NO_CXX11_DECLTYPE_N3276
-#define BOOST_NO_CXX11_DECLTYPE
-#define BOOST_NO_CXX11_CONSTEXPR
-#define BOOST_NO_CXX11_USER_DEFINED_LITERALS
-#define BOOST_NO_COMPLETE_VALUE_INITIALIZATION
-#define BOOST_NO_CXX11_CHAR32_T
-#define BOOST_NO_CXX11_CHAR16_T
+#define BOOST_NO_CXX11_NOEXCEPT
+#define BOOST_NO_CXX11_NULLPTR
+#define BOOST_NO_CXX11_RANGE_BASED_FOR
+#define BOOST_NO_CXX11_RAW_LITERALS
 #define BOOST_NO_CXX11_REF_QUALIFIERS
-#define BOOST_NO_CXX11_FINAL
+#define BOOST_NO_CXX11_RVALUE_REFERENCES
+#define BOOST_NO_CXX11_SCOPED_ENUMS
+#define BOOST_NO_CXX11_SFINAE_EXPR
+#define BOOST_NO_CXX11_STATIC_ASSERT
+#define BOOST_NO_CXX11_TEMPLATE_ALIASES
 #define BOOST_NO_CXX11_THREAD_LOCAL
-
+#define BOOST_NO_CXX11_UNICODE_LITERALS
+#define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
+#define BOOST_NO_CXX11_USER_DEFINED_LITERALS
+#define BOOST_NO_CXX11_VARIADIC_MACROS
+#define BOOST_NO_CXX11_VARIADIC_TEMPLATES
+#define BOOST_NO_SFINAE_EXPR
+#define BOOST_NO_TWO_PHASE_NAME_LOOKUP
 
 //#define BOOST_BCB_PARTIAL_SPECIALIZATION_BUG
 #define BOOST_MATH_DISABLE_STD_FPCLASSIFY
@@ -71,15 +230,15 @@
 #define BOOST_SP_USE_PTHREADS 
 #define BOOST_AC_USE_PTHREADS 
 
-/* everything that follows is working around what are thought to be
- * compiler shortcomings.  Revist all of these regularly.
- */
+//
+// Everything that follows is working around what are thought to be
+// compiler shortcomings. Revist all of these regularly.
+//
 
 //#define BOOST_USE_ENUM_STATIC_ASSERT
 //#define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS //(this may be implied by the previous #define
 
-// These constants should be provided by the 
-// compiler, at least when -hgnu is asserted on the command line.
+// These constants should be provided by the compiler.
 
 #ifndef __ATOMIC_RELAXED
 #define __ATOMIC_RELAXED 0
@@ -90,7 +249,55 @@
 #define __ATOMIC_SEQ_CST 5
 #endif
 
-#else  /* _RELEASE_MINOR */
+////
+//// Version changes
+////
+
+//
+// 8.5.0
+//
+
+#if BOOST_CRAY_VERSION >= 80500
+
+#if __cplusplus >= 201103L
+
+#undef BOOST_HAS_NRVO
+#undef BOOST_NO_COMPLETE_VALUE_INITIALIZATION
+#undef BOOST_NO_CXX11_AUTO_DECLARATIONS
+#undef BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
+#undef BOOST_NO_CXX11_CHAR16_T
+#undef BOOST_NO_CXX11_CHAR32_T
+#undef BOOST_NO_CXX11_CONSTEXPR
+#undef BOOST_NO_CXX11_DECLTYPE
+#undef BOOST_NO_CXX11_DECLTYPE_N3276
+#undef BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
+#undef BOOST_NO_CXX11_DELETED_FUNCTIONS
+#undef BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
+#undef BOOST_NO_CXX11_FINAL
+#undef BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
+#undef BOOST_NO_CXX11_LAMBDAS
+#undef BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
+#undef BOOST_NO_CXX11_NOEXCEPT
+#undef BOOST_NO_CXX11_NULLPTR
+#undef BOOST_NO_CXX11_RANGE_BASED_FOR
+#undef BOOST_NO_CXX11_RAW_LITERALS
+#undef BOOST_NO_CXX11_REF_QUALIFIERS
+#undef BOOST_NO_CXX11_RVALUE_REFERENCES
+#undef BOOST_NO_CXX11_SCOPED_ENUMS
+#undef BOOST_NO_CXX11_SFINAE_EXPR
+#undef BOOST_NO_CXX11_STATIC_ASSERT
+#undef BOOST_NO_CXX11_TEMPLATE_ALIASES
+#undef BOOST_NO_CXX11_THREAD_LOCAL
+#undef BOOST_NO_CXX11_UNICODE_LITERALS
+#undef BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
+#undef BOOST_NO_CXX11_USER_DEFINED_LITERALS
+#undef BOOST_NO_CXX11_VARIADIC_MACROS
+#undef BOOST_NO_CXX11_VARIADIC_TEMPLATES
+#undef BOOST_NO_SFINAE_EXPR
+#undef BOOST_NO_TWO_PHASE_NAME_LOOKUP
+#undef BOOST_MATH_DISABLE_STD_FPCLASSIFY
+#undef BOOST_SP_USE_PTHREADS 
+#undef BOOST_AC_USE_PTHREADS 
 
 #define BOOST_HAS_VARIADIC_TMPL
 #define BOOST_HAS_UNISTD_H
@@ -114,11 +321,120 @@
 #define BOOST_HAS_LONG_LONG
 #define BOOST_HAS_FLOAT128
 
-#if __cplusplus < 201400
+#if __cplusplus < 201402L
 #define BOOST_NO_CXX11_DECLTYPE_N3276
-#endif /* __cpluspus */
+#endif // __cplusplus < 201402L
+
+#endif // __cplusplus >= 201103L
+
+#endif // BOOST_CRAY_VERSION >= 80500
+
+//
+// 8.6.4
+// (versions prior to 8.6.5 do not define _RELEASE_PATCHLEVEL)
+//
+
+#if BOOST_CRAY_VERSION >= 80600
+
+#if __cplusplus >= 199711L
+#define BOOST_HAS_FLOAT128
+#define BOOST_HAS_PTHREAD_YIELD // This is a platform macro, but it improves test results.
+#define BOOST_NO_COMPLETE_VALUE_INITIALIZATION // This is correct. Test compiles, but fails to run.
+#undef  BOOST_NO_CXX11_CHAR16_T
+#undef  BOOST_NO_CXX11_CHAR32_T
+#undef  BOOST_NO_CXX11_INLINE_NAMESPACES
+#undef  BOOST_NO_CXX11_FINAL
+#undef  BOOST_NO_CXX11_FIXED_LENGTH_VARIADIC_TEMPLATE_EXPANSION_PACKS
+#undef  BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
+#define BOOST_NO_CXX11_SFINAE_EXPR // This is correct, even though '*_fail.cpp' test fails.
+#undef  BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
+#undef  BOOST_NO_CXX11_VARIADIC_MACROS
+#undef  BOOST_NO_CXX11_VARIADIC_TEMPLATES
+// 'BOOST_NO_DEDUCED_TYPENAME' test is broken. The test files are enabled /
+// disabled with an '#ifdef BOOST_DEDUCED_TYPENAME'. However,
+// 'boost/libs/config/include/boost/config/detail/suffix.hpp' ensures that
+// 'BOOST_DEDUCED_TYPENAME' is always defined (the value it is defined as
+// depends on 'BOOST_NO_DEDUCED_TYPENAME'). So, modifying
+// 'BOOST_NO_DEDUCED_TYPENAME' has no effect on which tests are run.
+//
+// The 'no_ded_typename_pass.cpp' test should always compile and run
+// successfully, because 'BOOST_DEDUCED_TYPENAME' must always have an
+// appropriate value (it's not just something that you turn on or off).
+// Therefore, if you wish to test changes to 'BOOST_NO_DEDUCED_TYPENAME',
+// you have to modify 'no_ded_typename_pass.cpp' to unconditionally include
+// 'boost_no_ded_typename.ipp'.
+#undef  BOOST_NO_DEDUCED_TYPENAME // This is correct. Test is broken.
+#undef  BOOST_NO_SFINAE_EXPR
+#undef  BOOST_NO_TWO_PHASE_NAME_LOOKUP
+#endif // __cplusplus >= 199711L
+
+#if __cplusplus >= 201103L
+#undef  BOOST_NO_CXX11_ALIGNAS
+#undef  BOOST_NO_CXX11_DECLTYPE_N3276
+#define BOOST_NO_CXX11_HDR_ATOMIC
+#undef  BOOST_NO_CXX11_HDR_FUNCTIONAL
+#define BOOST_NO_CXX11_HDR_REGEX // This is correct. Test compiles, but fails to run.
+#undef  BOOST_NO_CXX11_SFINAE_EXPR
+#undef  BOOST_NO_CXX11_SMART_PTR
+#undef  BOOST_NO_CXX11_TRAILING_RESULT_TYPES
+#endif // __cplusplus >= 201103L
+
+#if __cplusplus >= 201402L
+#undef  BOOST_NO_CXX14_CONSTEXPR
+#define BOOST_NO_CXX14_DIGIT_SEPARATORS
+#endif // __cplusplus == 201402L
+
+#endif // BOOST_CRAY_VERSION >= 80600
+
+//
+// 8.6.5
+// (no change from 8.6.4)
+//
+
+//
+// 8.7.0
+//
+
+#if BOOST_CRAY_VERSION >= 80700
+
+#if __cplusplus >= 199711L
+#endif // __cplusplus >= 199711L
+
+#if __cplusplus >= 201103L
+#undef  BOOST_NO_CXX11_HDR_ATOMIC
+#undef  BOOST_NO_CXX11_HDR_REGEX
+#endif // __cplusplus >= 201103L
+
+#if __cplusplus >= 201402L
+#endif // __cplusplus == 201402L
+
+#endif // BOOST_CRAY_VERSION >= 80700
+
+//
+// Next release
+//
+
+#if BOOST_CRAY_VERSION > 80799
+
+#if __cplusplus >= 199711L
+#endif // __cplusplus >= 199711L
+
+#if __cplusplus >= 201103L
+#endif // __cplusplus >= 201103L
+
+#if __cplusplus >= 201402L
+#endif // __cplusplus == 201402L
 
-#endif /* _RELEASE_MINOR */
+#endif // BOOST_CRAY_VERSION > 80799
 
+////
+//// Remove temporary macros
+////
 
+// I've commented out some '#undef' statements to signify that we purposely
+// want to keep certain macros.
 
+//#undef __GXX_EXPERIMENTAL_CXX0X__
+//#undef BOOST_COMPILER
+#undef BOOST_GCC_VERSION
+#undef BOOST_CRAY_VERSION
diff --git a/boost/config/compiler/digitalmars.hpp b/boost/config/compiler/digitalmars.hpp
index e4c5afddd2..3e9a3ab0f5 100644
--- a/boost/config/compiler/digitalmars.hpp
+++ b/boost/config/compiler/digitalmars.hpp
@@ -124,6 +124,9 @@
 #if !defined(__cpp_fold_expressions) || (__cpp_fold_expressions < 201603)
 #  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
 
 #if (__DMC__ <= 0x840)
 #error "Compiler not supported or configured - please reconfigure"
diff --git a/boost/config/compiler/gcc.hpp b/boost/config/compiler/gcc.hpp
index 4fe968a03c..19ccc592fd 100644
--- a/boost/config/compiler/gcc.hpp
+++ b/boost/config/compiler/gcc.hpp
@@ -299,6 +299,9 @@
 #if !defined(__cpp_fold_expressions) || (__cpp_fold_expressions < 201603)
 #  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
 
 #if __GNUC__ >= 7
 #  define BOOST_FALLTHROUGH __attribute__((fallthrough))
diff --git a/boost/config/compiler/gcc_xml.hpp b/boost/config/compiler/gcc_xml.hpp
index 2b47585ab8..bdba4ed092 100644
--- a/boost/config/compiler/gcc_xml.hpp
+++ b/boost/config/compiler/gcc_xml.hpp
@@ -102,6 +102,9 @@
 #if !defined(__cpp_fold_expressions) || (__cpp_fold_expressions < 201603)
 #  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
 
 #define BOOST_COMPILER "GCC-XML C++ version " __GCCXML__
 
diff --git a/boost/config/compiler/metrowerks.hpp b/boost/config/compiler/metrowerks.hpp
index 99ff0f5eea..4bfc01ece1 100644
--- a/boost/config/compiler/metrowerks.hpp
+++ b/boost/config/compiler/metrowerks.hpp
@@ -167,6 +167,9 @@
 #if !defined(__cpp_fold_expressions) || (__cpp_fold_expressions < 201603)
 #  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
 
 #define BOOST_COMPILER "Metrowerks CodeWarrior C++ version " BOOST_STRINGIZE(BOOST_COMPILER_VERSION)
 
diff --git a/boost/config/compiler/mpw.hpp b/boost/config/compiler/mpw.hpp
index d9544345ac..2292ada092 100644
--- a/boost/config/compiler/mpw.hpp
+++ b/boost/config/compiler/mpw.hpp
@@ -116,6 +116,9 @@
 #if !defined(__cpp_fold_expressions) || (__cpp_fold_expressions < 201603)
 #  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
 
 //
 // versions check:
diff --git a/boost/config/compiler/nvcc.hpp b/boost/config/compiler/nvcc.hpp
index f21b9b54fe..ed035fcf73 100644
--- a/boost/config/compiler/nvcc.hpp
+++ b/boost/config/compiler/nvcc.hpp
@@ -12,7 +12,7 @@
 #endif
 
 #if defined(__CUDACC_VER_MAJOR__) && defined(__CUDACC_VER_MINOR__) && defined(__CUDACC_VER_BUILD__)
-#  define BOOST_CUDA_VERSION __CUDACC_VER_MAJOR__ * 1000000 + __CUDACC_VER_MINOR__ * 10000 + __CUDACC_VER_BUILD__
+#  define BOOST_CUDA_VERSION (__CUDACC_VER_MAJOR__ * 1000000 + __CUDACC_VER_MINOR__ * 10000 + __CUDACC_VER_BUILD__)
 #else
 // We don't really know what the CUDA version is, but it's definitely before 7.5:
 #  define BOOST_CUDA_VERSION 7000000
@@ -33,8 +33,8 @@
 #if (BOOST_CUDA_VERSION > 8000000) && (BOOST_CUDA_VERSION < 8010000)
 #   define BOOST_NO_CXX11_VARIADIC_TEMPLATES
 #endif
-// Most recent CUDA (8.0) has no constexpr support in msvc mode:
-#if defined(_MSC_VER)
+// CUDA (8.0) has no constexpr support in msvc mode:
+#if defined(_MSC_VER) && (BOOST_CUDA_VERSION < 9000000)
 #  define BOOST_NO_CXX11_CONSTEXPR
 #endif
 
diff --git a/boost/config/compiler/pathscale.hpp b/boost/config/compiler/pathscale.hpp
index 94b3f91d07..1318d275ad 100644
--- a/boost/config/compiler/pathscale.hpp
+++ b/boost/config/compiler/pathscale.hpp
@@ -129,4 +129,7 @@
 #if !defined(__cpp_fold_expressions) || (__cpp_fold_expressions < 201603)
 #  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
 #endif
diff --git a/boost/config/compiler/sunpro_cc.hpp b/boost/config/compiler/sunpro_cc.hpp
index 54ad77a3c6..41b7bcade6 100644
--- a/boost/config/compiler/sunpro_cc.hpp
+++ b/boost/config/compiler/sunpro_cc.hpp
@@ -182,6 +182,9 @@
 #if !defined(__cpp_fold_expressions) || (__cpp_fold_expressions < 201603)
 #  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
 
 // Turn on threading support for Solaris 12.
 // Ticket #11972
diff --git a/boost/config/compiler/vacpp.hpp b/boost/config/compiler/vacpp.hpp
index c8400a34d3..cabe844ffd 100644
--- a/boost/config/compiler/vacpp.hpp
+++ b/boost/config/compiler/vacpp.hpp
@@ -178,3 +178,6 @@
 #if !defined(__cpp_fold_expressions) || (__cpp_fold_expressions < 201603)
 #  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
 #endif
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
diff --git a/boost/config/compiler/visualc.hpp b/boost/config/compiler/visualc.hpp
index c533c50dfc..ded7284a62 100644
--- a/boost/config/compiler/visualc.hpp
+++ b/boost/config/compiler/visualc.hpp
@@ -201,6 +201,7 @@
 //
 #if (_MSC_VER < 1911) || (_MSVC_LANG < 201703)
 #  define BOOST_NO_CXX17_STRUCTURED_BINDINGS
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
 #endif
 
 // MSVC including version 14 has not yet completely
diff --git a/boost/config/compiler/xlcpp.hpp b/boost/config/compiler/xlcpp.hpp
index a4c66e402c..ee7aa1253a 100644
--- a/boost/config/compiler/xlcpp.hpp
+++ b/boost/config/compiler/xlcpp.hpp
@@ -246,6 +246,10 @@
 #  define BOOST_NO_CXX17_STRUCTURED_BINDINGS
 #endif
 
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
+
 // Clang 3.9+ in c++1z
 #if !__has_cpp_attribute(fallthrough) || __cplusplus < 201406L
 #  define BOOST_NO_CXX17_INLINE_VARIABLES
diff --git a/boost/config/compiler/xlcpp_zos.hpp b/boost/config/compiler/xlcpp_zos.hpp
index bc785b8ab0..eb1bf2e992 100644
--- a/boost/config/compiler/xlcpp_zos.hpp
+++ b/boost/config/compiler/xlcpp_zos.hpp
@@ -153,6 +153,7 @@
 #define BOOST_NO_CXX17_STRUCTURED_BINDINGS
 #define BOOST_NO_CXX17_INLINE_VARIABLES
 #define BOOST_NO_CXX17_FOLD_EXPRESSIONS
+#define BOOST_NO_CXX17_IF_CONSTEXPR
 
 // -------------------------------------
 
diff --git a/boost/config/stdlib/dinkumware.hpp b/boost/config/stdlib/dinkumware.hpp
index 641c2ae2e8..e829f08e51 100644
--- a/boost/config/stdlib/dinkumware.hpp
+++ b/boost/config/stdlib/dinkumware.hpp
@@ -96,7 +96,7 @@
 #include <exception>
 #endif
 #include <typeinfo>
-#if ( (!_HAS_EXCEPTIONS && !defined(__ghs__)) || (!_HAS_NAMESPACE && defined(__ghs__)) ) && !defined(__TI_COMPILER_VERSION__) && !defined(__VISUALDSPVERSION__) \
+#if ( (!_HAS_EXCEPTIONS && !defined(__ghs__)) || (defined(__ghs__) && !_HAS_NAMESPACE) ) && !defined(__TI_COMPILER_VERSION__) && !defined(__VISUALDSPVERSION__) \
 	&& !defined(__VXWORKS__)
 #  define BOOST_NO_STD_TYPEINFO
 #endif  
@@ -175,7 +175,7 @@
 #  define BOOST_NO_CXX17_STD_APPLY
 #  define BOOST_NO_CXX17_ITERATOR_TRAITS
 #endif
-#if !defined(_CPPLIB_VER) || (_CPPLIB_VER < 650)
+#if !defined(_CPPLIB_VER) || (_CPPLIB_VER < 650) || !defined(_HAS_CXX17) || (_HAS_CXX17 == 0) || !defined(_MSVC_STL_UPDATE) || (_MSVC_STL_UPDATE < 201709)
 #  define BOOST_NO_CXX17_STD_INVOKE
 #endif
 
diff --git a/boost/config/stdlib/libcpp.hpp b/boost/config/stdlib/libcpp.hpp
index 1e77dca336..a051dbb750 100644
--- a/boost/config/stdlib/libcpp.hpp
+++ b/boost/config/stdlib/libcpp.hpp
@@ -87,9 +87,6 @@
 #endif
 
 // C++17 features
-#if (_LIBCPP_VERSION < 3700) || (__cplusplus <= 201402L)
-#  define BOOST_NO_CXX17_STD_INVOKE
-#endif
 #if (_LIBCPP_VERSION < 4000) || (__cplusplus <= 201402L)
 #  define BOOST_NO_CXX17_STD_APPLY
 #endif
@@ -104,6 +101,7 @@
 #endif
 
 #define BOOST_NO_CXX17_ITERATOR_TRAITS
+#define BOOST_NO_CXX17_STD_INVOKE      // Invoke support is incomplete (no invoke_result)
 
 #if (_LIBCPP_VERSION <= 1101) && !defined(BOOST_NO_CXX11_THREAD_LOCAL)
 // This is a bit of a sledgehammer, because really it's just libc++abi that has no
diff --git a/boost/config/stdlib/libstdcpp3.hpp b/boost/config/stdlib/libstdcpp3.hpp
index e99fe316df..f6eab26c65 100644
--- a/boost/config/stdlib/libstdcpp3.hpp
+++ b/boost/config/stdlib/libstdcpp3.hpp
@@ -294,12 +294,10 @@ extern "C" char *gets (char *__s);
 #endif
 
 //
-//  C++17 features in GCC 6.1 and later
+//  C++17 features in GCC 7.1 and later
 //
-#if (BOOST_LIBSTDCXX_VERSION < 60100) || (__cplusplus <= 201402L)
-#  define BOOST_NO_CXX17_STD_INVOKE
-#endif
 #if (BOOST_LIBSTDCXX_VERSION < 70100) || (__cplusplus <= 201402L)
+#  define BOOST_NO_CXX17_STD_INVOKE
 #  define BOOST_NO_CXX17_STD_APPLY
 #endif