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 | #ifndef __has_cpp_attribute |
31 | #define __has_cpp_attribute(x) 0 |
32 | #endif |
33 | |
34 | #if !__has_feature(cxx_exceptions) && !defined(BOOST_NO_EXCEPTIONS) |
35 | # define BOOST_NO_EXCEPTIONS |
36 | #endif |
37 | |
38 | #if !__has_feature(cxx_rtti) && !defined(BOOST_NO_RTTI) |
39 | # define BOOST_NO_RTTI |
40 | #endif |
41 | |
42 | #if !__has_feature(cxx_rtti) && !defined(BOOST_NO_TYPEID) |
43 | # define BOOST_NO_TYPEID |
44 | #endif |
45 | |
46 | #if !__has_feature(cxx_thread_local) |
47 | # define BOOST_NO_CXX11_THREAD_LOCAL |
48 | #endif |
49 | |
50 | #ifdef __is_identifier |
51 | #if !__is_identifier(__int64) && !defined(__GNUC__) |
52 | # define BOOST_HAS_MS_INT64 |
53 | #endif |
54 | #endif |
55 | |
56 | #if __has_include(<stdint.h>) |
57 | # define BOOST_HAS_STDINT_H |
58 | #endif |
59 | |
60 | #if (defined(linux) || defined(__linux) || defined(__linux__) || defined(__GNU__) || defined(__GLIBC__)) && !defined(_CRAYC) |
61 | #if (__clang_major__ >= 4) && defined(__has_include) |
62 | #if __has_include(<quadmath.h>) |
63 | # define BOOST_HAS_FLOAT128 |
64 | #endif |
65 | #endif |
66 | #endif |
67 | |
68 | |
69 | #define BOOST_HAS_NRVO |
70 | |
71 | // Branch prediction hints |
72 | #if !defined (__c2__) && defined(__has_builtin) |
73 | #if __has_builtin(__builtin_expect) |
74 | #define BOOST_LIKELY(x) __builtin_expect(x, 1) |
75 | #define BOOST_UNLIKELY(x) __builtin_expect(x, 0) |
76 | #endif |
77 | #endif |
78 | |
79 | // Clang supports "long long" in all compilation modes. |
80 | #define BOOST_HAS_LONG_LONG |
81 | |
82 | // |
83 | // We disable this if the compiler is really nvcc with C++03 as it |
84 | // doesn't actually support __int128 as of CUDA_VERSION=7500 |
85 | // even though it defines __SIZEOF_INT128__. |
86 | // See https://svn.boost.org/trac/boost/ticket/10418 |
87 | // https://svn.boost.org/trac/boost/ticket/11852 |
88 | // Only re-enable this for nvcc if you're absolutely sure |
89 | // of the circumstances under which it's supported. |
90 | // Similarly __SIZEOF_INT128__ is defined when targetting msvc |
91 | // compatibility even though the required support functions are absent. |
92 | // |
93 | #if defined(__CUDACC__) |
94 | # if defined(BOOST_GCC_CXX11) |
95 | # define BOOST_NVCC_CXX11 |
96 | # else |
97 | # define BOOST_NVCC_CXX03 |
98 | # endif |
99 | #endif |
100 | |
101 | #if defined(__SIZEOF_INT128__) && !defined(BOOST_NVCC_CXX03) && !defined(_MSC_VER) |
102 | # define BOOST_HAS_INT128 |
103 | #endif |
104 | |
105 | |
106 | // |
107 | // Dynamic shared object (DSO) and dynamic-link library (DLL) support |
108 | // |
109 | #if defined(_WIN32) || defined(__WIN32__) || defined(WIN32) || defined(__CYGWIN__) |
110 | # define BOOST_HAS_DECLSPEC |
111 | # define BOOST_SYMBOL_EXPORT __attribute__((__dllexport__)) |
112 | # define BOOST_SYMBOL_IMPORT __attribute__((__dllimport__)) |
113 | #else |
114 | # define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default"))) |
115 | # define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default"))) |
116 | # define BOOST_SYMBOL_IMPORT |
117 | #endif |
118 | |
119 | // |
120 | // The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through |
121 | // between switch labels. |
122 | // |
123 | #if __cplusplus >= 201103L && defined(__has_warning) |
124 | # if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough") |
125 | # define BOOST_FALLTHROUGH [[clang::fallthrough]] |
126 | # endif |
127 | #endif |
128 | |
129 | #if !__has_feature(cxx_auto_type) |
130 | # define BOOST_NO_CXX11_AUTO_DECLARATIONS |
131 | # define BOOST_NO_CXX11_AUTO_MULTIDECLARATIONS |
132 | #endif |
133 | |
134 | // |
135 | // Currently clang on Windows using VC++ RTL does not support C++11's char16_t or char32_t |
136 | // |
137 | #if (defined(_MSC_VER) && (_MSC_VER < 1900)) || !(defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L) |
138 | # define BOOST_NO_CXX11_CHAR16_T |
139 | # define BOOST_NO_CXX11_CHAR32_T |
140 | #endif |
141 | |
142 | #if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(__GNUC__) |
143 | #define BOOST_HAS_EXPM1 |
144 | #define BOOST_HAS_LOG1P |
145 | #endif |
146 | |
147 | #if !__has_feature(cxx_constexpr) |
148 | # define BOOST_NO_CXX11_CONSTEXPR |
149 | #endif |
150 | |
151 | #if !__has_feature(cxx_decltype) |
152 | # define BOOST_NO_CXX11_DECLTYPE |
153 | #endif |
154 | |
155 | #if !__has_feature(cxx_decltype_incomplete_return_types) |
156 | # define BOOST_NO_CXX11_DECLTYPE_N3276 |
157 | #endif |
158 | |
159 | #if !__has_feature(cxx_defaulted_functions) |
160 | # define BOOST_NO_CXX11_DEFAULTED_FUNCTIONS |
161 | #endif |
162 | |
163 | #if !__has_feature(cxx_deleted_functions) |
164 | # define BOOST_NO_CXX11_DELETED_FUNCTIONS |
165 | #endif |
166 | |
167 | #if !__has_feature(cxx_explicit_conversions) |
168 | # define BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS |
169 | #endif |
170 | |
171 | #if !__has_feature(cxx_default_function_template_args) |
172 | # define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS |
173 | #endif |
174 | |
175 | #if !__has_feature(cxx_generalized_initializers) |
176 | # define BOOST_NO_CXX11_HDR_INITIALIZER_LIST |
177 | #endif |
178 | |
179 | #if !__has_feature(cxx_lambdas) |
180 | # define BOOST_NO_CXX11_LAMBDAS |
181 | #endif |
182 | |
183 | #if !__has_feature(cxx_local_type_template_args) |
184 | # define BOOST_NO_CXX11_LOCAL_CLASS_TEMPLATE_PARAMETERS |
185 | #endif |
186 | |
187 | #if !__has_feature(cxx_noexcept) |
188 | # define BOOST_NO_CXX11_NOEXCEPT |
189 | #endif |
190 | |
191 | #if !__has_feature(cxx_nullptr) |
192 | # define BOOST_NO_CXX11_NULLPTR |
193 | #endif |
194 | |
195 | #if !__has_feature(cxx_range_for) |
196 | # define BOOST_NO_CXX11_RANGE_BASED_FOR |
197 | #endif |
198 | |
199 | #if !__has_feature(cxx_raw_string_literals) |
200 | # define BOOST_NO_CXX11_RAW_LITERALS |
201 | #endif |
202 | |
203 | #if !__has_feature(cxx_reference_qualified_functions) |
204 | # define BOOST_NO_CXX11_REF_QUALIFIERS |
205 | #endif |
206 | |
207 | #if !__has_feature(cxx_generalized_initializers) |
208 | # define BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX |
209 | #endif |
210 | |
211 | #if !__has_feature(cxx_rvalue_references) |
212 | # define BOOST_NO_CXX11_RVALUE_REFERENCES |
213 | #endif |
214 | |
215 | #if !__has_feature(cxx_strong_enums) |
216 | # define BOOST_NO_CXX11_SCOPED_ENUMS |
217 | #endif |
218 | |
219 | #if !__has_feature(cxx_static_assert) |
220 | # define BOOST_NO_CXX11_STATIC_ASSERT |
221 | #endif |
222 | |
223 | #if !__has_feature(cxx_alias_templates) |
224 | # define BOOST_NO_CXX11_TEMPLATE_ALIASES |
225 | #endif |
226 | |
227 | #if !__has_feature(cxx_unicode_literals) |
228 | # define BOOST_NO_CXX11_UNICODE_LITERALS |
229 | #endif |
230 | |
231 | #if !__has_feature(cxx_variadic_templates) |
232 | # define BOOST_NO_CXX11_VARIADIC_TEMPLATES |
233 | #endif |
234 | |
235 | #if !__has_feature(cxx_user_literals) |
236 | # define BOOST_NO_CXX11_USER_DEFINED_LITERALS |
237 | #endif |
238 | |
239 | #if !__has_feature(cxx_alignas) |
240 | # define BOOST_NO_CXX11_ALIGNAS |
241 | #endif |
242 | |
243 | #if !__has_feature(cxx_trailing_return) |
244 | # define BOOST_NO_CXX11_TRAILING_RESULT_TYPES |
245 | #endif |
246 | |
247 | #if !__has_feature(cxx_inline_namespaces) |
248 | # define BOOST_NO_CXX11_INLINE_NAMESPACES |
249 | #endif |
250 | |
251 | #if !__has_feature(cxx_override_control) |
252 | # define BOOST_NO_CXX11_FINAL |
253 | # define BOOST_NO_CXX11_OVERRIDE |
254 | #endif |
255 | |
256 | #if !__has_feature(cxx_unrestricted_unions) |
257 | # define BOOST_NO_CXX11_UNRESTRICTED_UNION |
258 | #endif |
259 | |
260 | #if !(__has_feature(__cxx_binary_literals__) || __has_extension(__cxx_binary_literals__)) |
261 | # define BOOST_NO_CXX14_BINARY_LITERALS |
262 | #endif |
263 | |
264 | #if !__has_feature(__cxx_decltype_auto__) |
265 | # define BOOST_NO_CXX14_DECLTYPE_AUTO |
266 | #endif |
267 | |
268 | #if !__has_feature(__cxx_aggregate_nsdmi__) |
269 | # define BOOST_NO_CXX14_AGGREGATE_NSDMI |
270 | #endif |
271 | |
272 | #if !__has_feature(__cxx_init_captures__) |
273 | # define BOOST_NO_CXX14_INITIALIZED_LAMBDA_CAPTURES |
274 | #endif |
275 | |
276 | #if !__has_feature(__cxx_generic_lambdas__) |
277 | # define BOOST_NO_CXX14_GENERIC_LAMBDAS |
278 | #endif |
279 | |
280 | // clang < 3.5 has a defect with dependent type, like following. |
281 | // |
282 | // template <class T> |
283 | // constexpr typename enable_if<pred<T> >::type foo(T &) |
284 | // { } // error: no return statement in constexpr function |
285 | // |
286 | // This issue also affects C++11 mode, but C++11 constexpr requires return stmt. |
287 | // Therefore we don't care such case. |
288 | // |
289 | // Note that we can't check Clang version directly as the numbering system changes depending who's |
290 | // creating the Clang release (see https://github.com/boostorg/config/pull/39#issuecomment-59927873) |
291 | // so instead verify that we have a feature that was introduced at the same time as working C++14 |
292 | // constexpr (generic lambda's in this case): |
293 | // |
294 | #if !__has_feature(__cxx_generic_lambdas__) || !__has_feature(__cxx_relaxed_constexpr__) |
295 | # define BOOST_NO_CXX14_CONSTEXPR |
296 | #endif |
297 | |
298 | #if !__has_feature(__cxx_return_type_deduction__) |
299 | # define BOOST_NO_CXX14_RETURN_TYPE_DEDUCTION |
300 | #endif |
301 | |
302 | #if !__has_feature(__cxx_variable_templates__) |
303 | # define BOOST_NO_CXX14_VARIABLE_TEMPLATES |
304 | #endif |
305 | |
306 | #if !defined(__cpp_structured_bindings) || (__cpp_structured_bindings < 201606) |
307 | # define BOOST_NO_CXX17_STRUCTURED_BINDINGS |
308 | #endif |
309 | |
310 | #if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606) |
311 | # define BOOST_NO_CXX17_IF_CONSTEXPR |
312 | #endif |
313 | |
314 | // Clang 3.9+ in c++1z |
315 | #if !__has_cpp_attribute(fallthrough) || __cplusplus < 201406L |
316 | # define BOOST_NO_CXX17_INLINE_VARIABLES |
317 | # define BOOST_NO_CXX17_FOLD_EXPRESSIONS |
318 | #endif |
319 | |
320 | #if __cplusplus < 201103L |
321 | #define BOOST_NO_CXX11_SFINAE_EXPR |
322 | #endif |
323 | |
324 | #if __cplusplus < 201400 |
325 | // All versions with __cplusplus above this value seem to support this: |
326 | # define BOOST_NO_CXX14_DIGIT_SEPARATORS |
327 | #endif |
328 | // |
329 | // __builtin_unreachable: |
330 | #if defined(__has_builtin) && __has_builtin(__builtin_unreachable) |
331 | #define BOOST_UNREACHABLE_RETURN(x) __builtin_unreachable(); |
332 | #endif |
333 | |
334 | #if (__clang_major__ == 3) && (__clang_minor__ == 0) |
335 | // Apparently a clang bug: |
336 | # define BOOST_NO_CXX11_FIXED_LENGTH_VARIADIC_TEMPLATE_EXPANSION_PACKS |
337 | #endif |
338 | |
339 | // Clang has supported the 'unused' attribute since the first release. |
340 | #define BOOST_ATTRIBUTE_UNUSED __attribute__((__unused__)) |
341 | |
342 | // Type aliasing hint. |
343 | #if __has_attribute(__may_alias__) |
344 | # define BOOST_MAY_ALIAS __attribute__((__may_alias__)) |
345 | #endif |
346 | |
347 | #ifndef BOOST_COMPILER |
348 | # define BOOST_COMPILER "Clang version " __clang_version__ |
349 | #endif |
350 | |
351 | // Macro used to identify the Clang compiler. |
352 | #define BOOST_CLANG 1 |
353 | |
354 | |