[ceph.git] / ceph / src / boost / libs / config / include / boost / config / compiler / clang.hpp

// (C) Copyright Douglas Gregor 2010
//
//  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.

// Clang compiler setup.

#define BOOST_HAS_PRAGMA_ONCE

// Detecting `-fms-extension` compiler flag assuming that _MSC_VER defined when that flag is used.
#if defined (_MSC_VER) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 4))
#   define BOOST_HAS_PRAGMA_DETECT_MISMATCH
#endif

// When compiling with clang before __has_extension was defined,
// even if one writes 'defined(__has_extension) && __has_extension(xxx)',
// clang reports a compiler error. So the only workaround found is:

#ifndef __has_extension
#define __has_extension __has_feature
#endif

#ifndef __has_attribute
#define __has_attribute(x) 0
#endif

#if !__has_feature(cxx_exceptions) && !defined(BOOST_NO_EXCEPTIONS)
#  define BOOST_NO_EXCEPTIONS
#endif

#if !__has_feature(cxx_rtti) && !defined(BOOST_NO_RTTI)
#  define BOOST_NO_RTTI
#endif

#if !__has_feature(cxx_rtti) && !defined(BOOST_NO_TYPEID)
#  define BOOST_NO_TYPEID
#endif

#if !__has_feature(cxx_thread_local)
#  define BOOST_NO_CXX11_THREAD_LOCAL
#endif

#ifdef __is_identifier
#if !__is_identifier(__int64) && !defined(__GNUC__)
#  define BOOST_HAS_MS_INT64
#endif
#endif

#if __has_include(<stdint.h>)
#  define BOOST_HAS_STDINT_H
#endif


#define BOOST_HAS_NRVO

// Branch prediction hints
#if defined(__has_builtin)
#if __has_builtin(__builtin_expect)
#define BOOST_LIKELY(x) __builtin_expect(x, 1)
#define BOOST_UNLIKELY(x) __builtin_expect(x, 0)
#endif
#endif

// Clang supports "long long" in all compilation modes.
#define BOOST_HAS_LONG_LONG

//
// We disable this if the compiler is really nvcc with C++03 as it
// doesn't actually support __int128 as of CUDA_VERSION=7500
// even though it defines __SIZEOF_INT128__.
// See https://svn.boost.org/trac/boost/ticket/10418
//     https://svn.boost.org/trac/boost/ticket/11852
// Only re-enable this for nvcc if you're absolutely sure
// of the circumstances under which it's supported.
// Similarly __SIZEOF_INT128__ is defined when targetting msvc
// compatibility even though the required support functions are absent.
//
#if defined(__CUDACC__)
#  if defined(BOOST_GCC_CXX11)
#    define BOOST_NVCC_CXX11
#  else
#    define BOOST_NVCC_CXX03
#  endif
#endif

#if defined(__SIZEOF_INT128__) && !defined(BOOST_NVCC_CXX03) && !defined(_MSC_VER)
#  define BOOST_HAS_INT128
#endif


//
// Dynamic shared object (DSO) and dynamic-link library (DLL) support
//
#if !defined(_WIN32) && !defined(__WIN32__) && !defined(WIN32)
#  define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))
#  define BOOST_SYMBOL_IMPORT
#  define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
#endif

//
// The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through
// between switch labels.
//
#if __cplusplus >= 201103L && defined(__has_warning)
#  if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
#    define BOOST_FALLTHROUGH [[clang::fallthrough]]
#  endif
#endif

#if !__has_feature(cxx_auto_type)
#  define BOOST_NO_CXX11_AUTO_DECLARATIONS
#  define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
#endif

//
// Currently clang on Windows using VC++ RTL does not support C++11's char16_t or char32_t
//
#if (defined(_MSC_VER) && (_MSC_VER < 1900)) || !(defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L)
#  define BOOST_NO_CXX11_CHAR16_T
#  define BOOST_NO_CXX11_CHAR32_T
#endif

#if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(__GNUC__)
#define BOOST_HAS_EXPM1
#define BOOST_HAS_LOG1P
#endif

#if !__has_feature(cxx_constexpr)
#  define BOOST_NO_CXX11_CONSTEXPR
#endif

#if !__has_feature(cxx_decltype)
#  define BOOST_NO_CXX11_DECLTYPE
#endif

#if !__has_feature(cxx_decltype_incomplete_return_types)
#  define BOOST_NO_CXX11_DECLTYPE_N3276
#endif

#if !__has_feature(cxx_defaulted_functions)
#  define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
#endif

#if !__has_feature(cxx_deleted_functions)
#  define BOOST_NO_CXX11_DELETED_FUNCTIONS
#endif

#if !__has_feature(cxx_explicit_conversions)
#  define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
#endif

#if !__has_feature(cxx_default_function_template_args)
#  define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
#endif

#if !__has_feature(cxx_generalized_initializers)
#  define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
#endif

#if !__has_feature(cxx_lambdas)
#  define BOOST_NO_CXX11_LAMBDAS
#endif

#if !__has_feature(cxx_local_type_template_args)
#  define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
#endif

#if !__has_feature(cxx_noexcept)
#  define BOOST_NO_CXX11_NOEXCEPT
#endif

#if !__has_feature(cxx_nullptr)
#  define BOOST_NO_CXX11_NULLPTR
#endif

#if !__has_feature(cxx_range_for)
#  define BOOST_NO_CXX11_RANGE_BASED_FOR
#endif

#if !__has_feature(cxx_raw_string_literals)
#  define BOOST_NO_CXX11_RAW_LITERALS
#endif

#if !__has_feature(cxx_reference_qualified_functions)
#  define BOOST_NO_CXX11_REF_QUALIFIERS
#endif

#if !__has_feature(cxx_generalized_initializers)
#  define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
#endif

#if !__has_feature(cxx_rvalue_references)
#  define BOOST_NO_CXX11_RVALUE_REFERENCES
#endif

#if !__has_feature(cxx_strong_enums)
#  define BOOST_NO_CXX11_SCOPED_ENUMS
#endif

#if !__has_feature(cxx_static_assert)
#  define BOOST_NO_CXX11_STATIC_ASSERT
#endif

#if !__has_feature(cxx_alias_templates)
#  define BOOST_NO_CXX11_TEMPLATE_ALIASES
#endif

#if !__has_feature(cxx_unicode_literals)
#  define BOOST_NO_CXX11_UNICODE_LITERALS
#endif

#if !__has_feature(cxx_variadic_templates)
#  define BOOST_NO_CXX11_VARIADIC_TEMPLATES
#endif

#if !__has_feature(cxx_user_literals)
#  define BOOST_NO_CXX11_USER_DEFINED_LITERALS
#endif

#if !__has_feature(cxx_alignas)
#  define BOOST_NO_CXX11_ALIGNAS
#endif

#if !__has_feature(cxx_trailing_return)
#  define BOOST_NO_CXX11_TRAILING_RESULT_TYPES
#endif

#if !__has_feature(cxx_inline_namespaces)
#  define BOOST_NO_CXX11_INLINE_NAMESPACES
#endif

#if !__has_feature(cxx_override_control)
#  define BOOST_NO_CXX11_FINAL
#endif

#if !(__has_feature(__cxx_binary_literals__) || __has_extension(__cxx_binary_literals__))
#  define BOOST_NO_CXX14_BINARY_LITERALS
#endif

#if !__has_feature(__cxx_decltype_auto__)
#  define BOOST_NO_CXX14_DECLTYPE_AUTO
#endif

#if !__has_feature(__cxx_aggregate_nsdmi__)
#  define BOOST_NO_CXX14_AGGREGATE_NSDMI
#endif

#if !__has_feature(__cxx_init_captures__)
#  define BOOST_NO_CXX14_INITIALIZED_LAMBDA_CAPTURES
#endif

#if !__has_feature(__cxx_generic_lambdas__)
#  define BOOST_NO_CXX14_GENERIC_LAMBDAS
#endif

// clang < 3.5 has a defect with dependent type, like following.
//
//  template <class T>
//  constexpr typename enable_if<pred<T> >::type foo(T &)
//  { } // error: no return statement in constexpr function
//
// This issue also affects C++11 mode, but C++11 constexpr requires return stmt.
// Therefore we don't care such case.
//
// Note that we can't check Clang version directly as the numbering system changes depending who's
// creating the Clang release (see https://github.com/boostorg/config/pull/39#issuecomment-59927873)
// so instead verify that we have a feature that was introduced at the same time as working C++14
// constexpr (generic lambda's in this case):
//
#if !__has_feature(__cxx_generic_lambdas__) || !__has_feature(__cxx_relaxed_constexpr__)
#  define BOOST_NO_CXX14_CONSTEXPR
#endif

#if !__has_feature(__cxx_return_type_deduction__)
#  define BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION
#endif

#if !__has_feature(__cxx_variable_templates__)
#  define BOOST_NO_CXX14_VARIABLE_TEMPLATES
#endif

#if __cplusplus < 201400
// All versions with __cplusplus above this value seem to support this:
#  define BOOST_NO_CXX14_DIGIT_SEPARATORS
#endif
//
// __builtin_unreachable:
#if defined(__has_builtin) && __has_builtin(__builtin_unreachable)
#define BOOST_UNREACHABLE_RETURN(x) __builtin_unreachable();
#endif

// Clang has supported the 'unused' attribute since the first release.
#define BOOST_ATTRIBUTE_UNUSED __attribute__((__unused__))

#ifndef BOOST_COMPILER
#  define BOOST_COMPILER "Clang version " __clang_version__
#endif

// Macro used to identify the Clang compiler.
#define BOOST_CLANG 1
Commit	Line	Data
7c673cae FG	1	// (C) Copyright Douglas Gregor 2010
	2	//
	3	// Use, modification and distribution are subject to the
	4	// Boost Software License, Version 1.0. (See accompanying file
	5	// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
	6
	7	// See http://www.boost.org for most recent version.
	8
	9	// Clang compiler setup.
	10
	11	#define BOOST_HAS_PRAGMA_ONCE
	12
	13	// Detecting `-fms-extension` compiler flag assuming that _MSC_VER defined when that flag is used.
	14	#if defined (_MSC_VER) && (__clang_major__ > 3 \|\| (__clang_major__ == 3 && __clang_minor__ >= 4))
	15	# define BOOST_HAS_PRAGMA_DETECT_MISMATCH
	16	#endif
	17
	18	// When compiling with clang before __has_extension was defined,
	19	// even if one writes 'defined(__has_extension) && __has_extension(xxx)',
	20	// clang reports a compiler error. So the only workaround found is:
	21
	22	#ifndef __has_extension
	23	#define __has_extension __has_feature
	24	#endif
	25
	26	#ifndef __has_attribute
	27	#define __has_attribute(x) 0
	28	#endif
	29
	30	#if !__has_feature(cxx_exceptions) && !defined(BOOST_NO_EXCEPTIONS)
	31	# define BOOST_NO_EXCEPTIONS
	32	#endif
	33
	34	#if !__has_feature(cxx_rtti) && !defined(BOOST_NO_RTTI)
	35	# define BOOST_NO_RTTI
	36	#endif
	37
	38	#if !__has_feature(cxx_rtti) && !defined(BOOST_NO_TYPEID)
	39	# define BOOST_NO_TYPEID
	40	#endif
	41
	42	#if !__has_feature(cxx_thread_local)
	43	# define BOOST_NO_CXX11_THREAD_LOCAL
	44	#endif
	45
	46	#ifdef __is_identifier
	47	#if !__is_identifier(__int64) && !defined(__GNUC__)
	48	# define BOOST_HAS_MS_INT64
	49	#endif
	50	#endif
	51
	52	#if __has_include(<stdint.h>)
	53	# define BOOST_HAS_STDINT_H
	54	#endif
	55
	56
	57	#define BOOST_HAS_NRVO
	58
	59	// Branch prediction hints
	60	#if defined(__has_builtin)
	61	#if __has_builtin(__builtin_expect)
	62	#define BOOST_LIKELY(x) __builtin_expect(x, 1)
	63	#define BOOST_UNLIKELY(x) __builtin_expect(x, 0)
	64	#endif
65	#endif
66
67	// Clang supports "long long" in all compilation modes.
68	#define BOOST_HAS_LONG_LONG
69
70	//
71	// We disable this if the compiler is really nvcc with C++03 as it
72	// doesn't actually support __int128 as of CUDA_VERSION=7500
73	// even though it defines __SIZEOF_INT128__.
74	// See https://svn.boost.org/trac/boost/ticket/10418
75	// https://svn.boost.org/trac/boost/ticket/11852
76	// Only re-enable this for nvcc if you're absolutely sure
77	// of the circumstances under which it's supported.
78	// Similarly __SIZEOF_INT128__ is defined when targetting msvc
79	// compatibility even though the required support functions are absent.
80	//
81	#if defined(__CUDACC__)
82	# if defined(BOOST_GCC_CXX11)
83	# define BOOST_NVCC_CXX11
84	# else
85	# define BOOST_NVCC_CXX03
86	# endif
87	#endif
88
89	#if defined(__SIZEOF_INT128__) && !defined(BOOST_NVCC_CXX03) && !defined(_MSC_VER)
90	# define BOOST_HAS_INT128
91	#endif
92
93
94	//
95	// Dynamic shared object (DSO) and dynamic-link library (DLL) support
96	//
97	#if !defined(_WIN32) && !defined(__WIN32__) && !defined(WIN32)
98	# define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))
99	# define BOOST_SYMBOL_IMPORT
100	# define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
101	#endif
102
103	//
104	// The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through
105	// between switch labels.
106	//
107	#if __cplusplus >= 201103L && defined(__has_warning)
108	# if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
109	# define BOOST_FALLTHROUGH [[clang::fallthrough]]
110	# endif
111	#endif
112
113	#if !__has_feature(cxx_auto_type)
114	# define BOOST_NO_CXX11_AUTO_DECLARATIONS
115	# define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS
116	#endif
117
118	//
119	// Currently clang on Windows using VC++ RTL does not support C++11's char16_t or char32_t
120	//
121	#if (defined(_MSC_VER) && (_MSC_VER < 1900)) \|\| !(defined(__GXX_EXPERIMENTAL_CXX0X__) \|\| __cplusplus >= 201103L)
122	# define BOOST_NO_CXX11_CHAR16_T
123	# define BOOST_NO_CXX11_CHAR32_T
124	#endif
125
126	#if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(__GNUC__)
127	#define BOOST_HAS_EXPM1
128	#define BOOST_HAS_LOG1P
129	#endif
130
131	#if !__has_feature(cxx_constexpr)
132	# define BOOST_NO_CXX11_CONSTEXPR
133	#endif
134
135	#if !__has_feature(cxx_decltype)
136	# define BOOST_NO_CXX11_DECLTYPE
137	#endif
138
139	#if !__has_feature(cxx_decltype_incomplete_return_types)
140	# define BOOST_NO_CXX11_DECLTYPE_N3276
141	#endif
142
143	#if !__has_feature(cxx_defaulted_functions)
144	# define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
145	#endif
146
147	#if !__has_feature(cxx_deleted_functions)
148	# define BOOST_NO_CXX11_DELETED_FUNCTIONS
149	#endif
150
151	#if !__has_feature(cxx_explicit_conversions)
152	# define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
153	#endif
154
155	#if !__has_feature(cxx_default_function_template_args)
156	# define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
157	#endif
158
159	#if !__has_feature(cxx_generalized_initializers)
160	# define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
161	#endif
162
163	#if !__has_feature(cxx_lambdas)
164	# define BOOST_NO_CXX11_LAMBDAS
165	#endif
166
167	#if !__has_feature(cxx_local_type_template_args)
168	# define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS
169	#endif
170
171	#if !__has_feature(cxx_noexcept)
172	# define BOOST_NO_CXX11_NOEXCEPT
173	#endif
174
175	#if !__has_feature(cxx_nullptr)
176	# define BOOST_NO_CXX11_NULLPTR
177	#endif
178
179	#if !__has_feature(cxx_range_for)
180	# define BOOST_NO_CXX11_RANGE_BASED_FOR
181	#endif
182
183	#if !__has_feature(cxx_raw_string_literals)
184	# define BOOST_NO_CXX11_RAW_LITERALS
185	#endif
186
187	#if !__has_feature(cxx_reference_qualified_functions)
188	# define BOOST_NO_CXX11_REF_QUALIFIERS
189	#endif
190
191	#if !__has_feature(cxx_generalized_initializers)
192	# define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
193	#endif
194
195	#if !__has_feature(cxx_rvalue_references)
196	# define BOOST_NO_CXX11_RVALUE_REFERENCES
197	#endif
198
199	#if !__has_feature(cxx_strong_enums)
200	# define BOOST_NO_CXX11_SCOPED_ENUMS
201	#endif
202
203	#if !__has_feature(cxx_static_assert)
204	# define BOOST_NO_CXX11_STATIC_ASSERT
205	#endif
206
207	#if !__has_feature(cxx_alias_templates)
208	# define BOOST_NO_CXX11_TEMPLATE_ALIASES
209	#endif
210
211	#if !__has_feature(cxx_unicode_literals)
212	# define BOOST_NO_CXX11_UNICODE_LITERALS
213	#endif
214
215	#if !__has_feature(cxx_variadic_templates)
216	# define BOOST_NO_CXX11_VARIADIC_TEMPLATES
217	#endif
218
219	#if !__has_feature(cxx_user_literals)
220	# define BOOST_NO_CXX11_USER_DEFINED_LITERALS
221	#endif
222
223	#if !__has_feature(cxx_alignas)
224	# define BOOST_NO_CXX11_ALIGNAS
225	#endif
226
227	#if !__has_feature(cxx_trailing_return)
228	# define BOOST_NO_CXX11_TRAILING_RESULT_TYPES
229	#endif
230
231	#if !__has_feature(cxx_inline_namespaces)
232	# define BOOST_NO_CXX11_INLINE_NAMESPACES
233	#endif
234
235	#if !__has_feature(cxx_override_control)
236	# define BOOST_NO_CXX11_FINAL
237	#endif
238
239	#if !(__has_feature(__cxx_binary_literals__) \|\| __has_extension(__cxx_binary_literals__))
240	# define BOOST_NO_CXX14_BINARY_LITERALS
241	#endif
242
243	#if !__has_feature(__cxx_decltype_auto__)
244	# define BOOST_NO_CXX14_DECLTYPE_AUTO
245	#endif
246
247	#if !__has_feature(__cxx_aggregate_nsdmi__)
248	# define BOOST_NO_CXX14_AGGREGATE_NSDMI
249	#endif
250
251	#if !__has_feature(__cxx_init_captures__)
252	# define BOOST_NO_CXX14_INITIALIZED_LAMBDA_CAPTURES
253	#endif
254
255	#if !__has_feature(__cxx_generic_lambdas__)
256	# define BOOST_NO_CXX14_GENERIC_LAMBDAS
257	#endif
258
259	// clang < 3.5 has a defect with dependent type, like following.
260	//
261	// template <class T>
262	// constexpr typename enable_if<pred<T> >::type foo(T &)
263	// { } // error: no return statement in constexpr function
264	//
265	// This issue also affects C++11 mode, but C++11 constexpr requires return stmt.
266	// Therefore we don't care such case.
267	//
268	// Note that we can't check Clang version directly as the numbering system changes depending who's
269	// creating the Clang release (see https://github.com/boostorg/config/pull/39#issuecomment-59927873)
270	// so instead verify that we have a feature that was introduced at the same time as working C++14
271	// constexpr (generic lambda's in this case):
272	//
273	#if !__has_feature(__cxx_generic_lambdas__) \|\| !__has_feature(__cxx_relaxed_constexpr__)
274	# define BOOST_NO_CXX14_CONSTEXPR
275	#endif
276
277	#if !__has_feature(__cxx_return_type_deduction__)
278	# define BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION
279	#endif
280
281	#if !__has_feature(__cxx_variable_templates__)
282	# define BOOST_NO_CXX14_VARIABLE_TEMPLATES
283	#endif
284
285	#if __cplusplus < 201400
286	// All versions with __cplusplus above this value seem to support this:
287	# define BOOST_NO_CXX14_DIGIT_SEPARATORS
288	#endif
289	//
290	// __builtin_unreachable:
291	#if defined(__has_builtin) && __has_builtin(__builtin_unreachable)
292	#define BOOST_UNREACHABLE_RETURN(x) __builtin_unreachable();
293	#endif
294
295	// Clang has supported the 'unused' attribute since the first release.
296	#define BOOST_ATTRIBUTE_UNUSED __attribute__((__unused__))
297
298	#ifndef BOOST_COMPILER
299	# define BOOST_COMPILER "Clang version " __clang_version__
300	#endif
301
302	// Macro used to identify the Clang compiler.
303	#define BOOST_CLANG 1
304