1 // Predefined symbols and macros -*- C++ -*-
3 // Copyright (C) 1997-2015 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
25 /** @file bits/c++config.h
26 * This is an internal header file, included by other library headers.
27 * Do not attempt to use it directly. @headername{iosfwd}
30 #ifndef _GLIBCXX_CXX_CONFIG_H
31 #define _GLIBCXX_CXX_CONFIG_H 1
33 // The current version of the C++ library in compressed ISO date format.
36 // Macros for various attributes.
41 // _GLIBCXX_VISIBILITY
43 # define _GLIBCXX_PURE __attribute__ ((__pure__))
46 #ifndef _GLIBCXX_CONST
47 # define _GLIBCXX_CONST __attribute__ ((__const__))
50 #ifndef _GLIBCXX_NORETURN
51 # define _GLIBCXX_NORETURN __attribute__ ((__noreturn__))
55 #ifndef _GLIBCXX_NOTHROW
57 # define _GLIBCXX_NOTHROW __attribute__((__nothrow__))
61 // Macros for visibility attributes.
62 // _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
63 // _GLIBCXX_VISIBILITY
64 #define _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
66 #if _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
67 # define _GLIBCXX_VISIBILITY(V) __attribute__ ((__visibility__ (#V)))
69 // If this is not supplied by the OS-specific or CPU-specific
70 // headers included below, it will be defined to an empty default.
71 # define _GLIBCXX_VISIBILITY(V) _GLIBCXX_PSEUDO_VISIBILITY(V)
74 // Macros for deprecated attributes.
75 // _GLIBCXX_USE_DEPRECATED
76 // _GLIBCXX_DEPRECATED
77 #ifndef _GLIBCXX_USE_DEPRECATED
78 # define _GLIBCXX_USE_DEPRECATED 1
81 #if defined(__DEPRECATED) && (__cplusplus >= 201103L)
82 # define _GLIBCXX_DEPRECATED __attribute__ ((__deprecated__))
84 # define _GLIBCXX_DEPRECATED
87 // Macros for ABI tag attributes.
88 #ifndef _GLIBCXX_ABI_TAG_CXX11
89 # define _GLIBCXX_ABI_TAG_CXX11 __attribute ((__abi_tag__ ("cxx11")))
95 // Macro for constexpr, to support in mixed 03/0x mode.
96 #ifndef _GLIBCXX_CONSTEXPR
97 # if __cplusplus >= 201103L
98 # define _GLIBCXX_CONSTEXPR constexpr
99 # define _GLIBCXX_USE_CONSTEXPR constexpr
101 # define _GLIBCXX_CONSTEXPR
102 # define _GLIBCXX_USE_CONSTEXPR const
106 #ifndef _GLIBCXX14_CONSTEXPR
107 # if __cplusplus >= 201402L
108 # define _GLIBCXX14_CONSTEXPR constexpr
110 # define _GLIBCXX14_CONSTEXPR
114 // Macro for noexcept, to support in mixed 03/0x mode.
115 #ifndef _GLIBCXX_NOEXCEPT
116 # if __cplusplus >= 201103L
117 # define _GLIBCXX_NOEXCEPT noexcept
118 # define _GLIBCXX_USE_NOEXCEPT noexcept
119 # define _GLIBCXX_THROW(_EXC)
121 # define _GLIBCXX_NOEXCEPT
122 # define _GLIBCXX_USE_NOEXCEPT throw()
123 # define _GLIBCXX_THROW(_EXC) throw(_EXC)
127 #ifndef _GLIBCXX_NOTHROW
128 # define _GLIBCXX_NOTHROW _GLIBCXX_USE_NOEXCEPT
131 #ifndef _GLIBCXX_THROW_OR_ABORT
132 # if __cpp_exceptions
133 # define _GLIBCXX_THROW_OR_ABORT(_EXC) (throw (_EXC))
135 # define _GLIBCXX_THROW_OR_ABORT(_EXC) (__builtin_abort())
139 // Macro for extern template, ie controling template linkage via use
140 // of extern keyword on template declaration. As documented in the g++
141 // manual, it inhibits all implicit instantiations and is used
142 // throughout the library to avoid multiple weak definitions for
143 // required types that are already explicitly instantiated in the
144 // library binary. This substantially reduces the binary size of
145 // resulting executables.
146 // Special case: _GLIBCXX_EXTERN_TEMPLATE == -1 disallows extern
147 // templates only in basic_string, thus activating its debug-mode
148 // checks even at -O0.
149 #define _GLIBCXX_EXTERN_TEMPLATE
152 Outline of libstdc++ namespaces.
156 namespace __debug { }
157 namespace __parallel { }
158 namespace __profile { }
159 namespace __cxx1998 { }
161 namespace __detail { }
163 namespace rel_ops { }
167 namespace placeholders { }
168 namespace regex_constants { }
169 namespace __detail { }
174 namespace decimal { }
177 namespace placeholders { }
178 namespace regex_constants { }
179 namespace this_thread { }
181 namespace experimental { }
188 namespace __detail { }
191 For full details see:
192 http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespaces.html
196 typedef __SIZE_TYPE__ size_t;
197 typedef __PTRDIFF_TYPE__ ptrdiff_t;
199 #if __cplusplus >= 201103L
200 typedef decltype(nullptr) nullptr_t;
204 #define _GLIBCXX_USE_DUAL_ABI
206 #if ! _GLIBCXX_USE_DUAL_ABI
207 // Ignore any pre-defined value of _GLIBCXX_USE_CXX11_ABI
208 # undef _GLIBCXX_USE_CXX11_ABI
211 #ifndef _GLIBCXX_USE_CXX11_ABI
212 #define _GLIBCXX_USE_CXX11_ABI
215 #if _GLIBCXX_USE_CXX11_ABI
218 inline namespace __cxx11 __attribute__((__abi_tag__)) { }
220 # define _GLIBCXX_NAMESPACE_CXX11 __cxx11::
221 # define _GLIBCXX_BEGIN_NAMESPACE_CXX11 namespace __cxx11 {
222 # define _GLIBCXX_END_NAMESPACE_CXX11 }
223 # define _GLIBCXX_DEFAULT_ABI_TAG _GLIBCXX_ABI_TAG_CXX11
225 # define _GLIBCXX_NAMESPACE_CXX11
226 # define _GLIBCXX_BEGIN_NAMESPACE_CXX11
227 # define _GLIBCXX_END_NAMESPACE_CXX11
228 # define _GLIBCXX_DEFAULT_ABI_TAG
232 // Defined if inline namespaces are used for versioning.
233 #define _GLIBCXX_INLINE_VERSION
235 // Inline namespace for symbol versioning.
236 #if _GLIBCXX_INLINE_VERSION
240 inline namespace __7 { }
242 namespace rel_ops { inline namespace __7 { } }
246 inline namespace __7 { }
247 namespace placeholders { inline namespace __7 { } }
248 namespace regex_constants { inline namespace __7 { } }
249 namespace __detail { inline namespace __7 { } }
253 { inline namespace __7 { } }
255 namespace decimal { inline namespace __7 { } }
257 namespace chrono { inline namespace __7 { } }
258 namespace placeholders { inline namespace __7 { } }
259 namespace regex_constants { inline namespace __7 { } }
260 namespace this_thread { inline namespace __7 { } }
262 namespace experimental { inline namespace __7 { } }
264 namespace __detail { inline namespace __7 { } }
269 inline namespace __7 { }
270 namespace __detail { inline namespace __7 { } }
272 # define _GLIBCXX_BEGIN_NAMESPACE_VERSION namespace __7 {
273 # define _GLIBCXX_END_NAMESPACE_VERSION }
275 # define _GLIBCXX_BEGIN_NAMESPACE_VERSION
276 # define _GLIBCXX_END_NAMESPACE_VERSION
280 // Inline namespaces for special modes: debug, parallel, profile.
281 #if defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_PARALLEL) \
282 || defined(_GLIBCXX_PROFILE)
285 // Non-inline namespace for components replaced by alternates in active mode.
288 # if _GLIBCXX_INLINE_VERSION
289 inline namespace __7 { }
292 # if _GLIBCXX_USE_CXX11_ABI
293 inline namespace __cxx11 __attribute__((__abi_tag__)) { }
297 // Inline namespace for debug mode.
298 # ifdef _GLIBCXX_DEBUG
299 inline namespace __debug { }
302 // Inline namespaces for parallel mode.
303 # ifdef _GLIBCXX_PARALLEL
304 inline namespace __parallel { }
307 // Inline namespaces for profile mode
308 # ifdef _GLIBCXX_PROFILE
309 inline namespace __profile { }
313 // Check for invalid usage and unsupported mixed-mode use.
314 # if defined(_GLIBCXX_DEBUG) && defined(_GLIBCXX_PARALLEL)
315 # error illegal use of multiple inlined namespaces
317 # if defined(_GLIBCXX_PROFILE) && defined(_GLIBCXX_DEBUG)
318 # error illegal use of multiple inlined namespaces
320 # if defined(_GLIBCXX_PROFILE) && defined(_GLIBCXX_PARALLEL)
321 # error illegal use of multiple inlined namespaces
324 // Check for invalid use due to lack for weak symbols.
325 # if __NO_INLINE__ && !__GXX_WEAK__
326 # warning currently using inlined namespace mode which may fail \
327 without inlining due to lack of weak symbols
331 // Macros for namespace scope. Either namespace std:: or the name
332 // of some nested namespace within it corresponding to the active mode.
336 // Macros for opening/closing conditional namespaces.
337 // _GLIBCXX_BEGIN_NAMESPACE_ALGO
338 // _GLIBCXX_END_NAMESPACE_ALGO
339 // _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
340 // _GLIBCXX_END_NAMESPACE_CONTAINER
341 #if defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_PROFILE)
342 # define _GLIBCXX_STD_C __cxx1998
343 # define _GLIBCXX_BEGIN_NAMESPACE_CONTAINER \
344 namespace _GLIBCXX_STD_C { _GLIBCXX_BEGIN_NAMESPACE_VERSION
345 # define _GLIBCXX_END_NAMESPACE_CONTAINER \
346 _GLIBCXX_END_NAMESPACE_VERSION }
347 # undef _GLIBCXX_EXTERN_TEMPLATE
348 # define _GLIBCXX_EXTERN_TEMPLATE -1
351 #ifdef _GLIBCXX_PARALLEL
352 # define _GLIBCXX_STD_A __cxx1998
353 # define _GLIBCXX_BEGIN_NAMESPACE_ALGO \
354 namespace _GLIBCXX_STD_A { _GLIBCXX_BEGIN_NAMESPACE_VERSION
355 # define _GLIBCXX_END_NAMESPACE_ALGO \
356 _GLIBCXX_END_NAMESPACE_VERSION }
359 #ifndef _GLIBCXX_STD_A
360 # define _GLIBCXX_STD_A std
363 #ifndef _GLIBCXX_STD_C
364 # define _GLIBCXX_STD_C std
367 #ifndef _GLIBCXX_BEGIN_NAMESPACE_ALGO
368 # define _GLIBCXX_BEGIN_NAMESPACE_ALGO
371 #ifndef _GLIBCXX_END_NAMESPACE_ALGO
372 # define _GLIBCXX_END_NAMESPACE_ALGO
375 #ifndef _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
376 # define _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
379 #ifndef _GLIBCXX_END_NAMESPACE_CONTAINER
380 # define _GLIBCXX_END_NAMESPACE_CONTAINER
383 // GLIBCXX_ABI Deprecated
384 // Define if compatibility should be provided for -mlong-double-64.
385 #undef _GLIBCXX_LONG_DOUBLE_COMPAT
387 // Inline namespace for long double 128 mode.
388 #if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined __LONG_DOUBLE_128__
391 inline namespace __gnu_cxx_ldbl128 { }
393 # define _GLIBCXX_NAMESPACE_LDBL __gnu_cxx_ldbl128::
394 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL namespace __gnu_cxx_ldbl128 {
395 # define _GLIBCXX_END_NAMESPACE_LDBL }
397 # define _GLIBCXX_NAMESPACE_LDBL
398 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL
399 # define _GLIBCXX_END_NAMESPACE_LDBL
401 #if _GLIBCXX_USE_CXX11_ABI
402 # define _GLIBCXX_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_NAMESPACE_CXX11
403 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_BEGIN_NAMESPACE_CXX11
404 # define _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_END_NAMESPACE_CXX11
406 # define _GLIBCXX_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_NAMESPACE_LDBL
407 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_BEGIN_NAMESPACE_LDBL
408 # define _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_END_NAMESPACE_LDBL
412 #if !defined(_GLIBCXX_DEBUG) && !defined(_GLIBCXX_PARALLEL)
413 # define __glibcxx_assert(_Condition)
417 // Avoid the use of assert, because we're trying to keep the <cassert>
418 // include out of the mix.
420 __replacement_assert(const char* __file, int __line,
421 const char* __function, const char* __condition)
423 __builtin_printf("%s:%d: %s: Assertion '%s' failed.\n", __file, __line,
424 __function, __condition);
428 #define __glibcxx_assert(_Condition) \
431 if (! (_Condition)) \
432 std::__replacement_assert(__FILE__, __LINE__, __PRETTY_FUNCTION__, \
437 // Macros for race detectors.
438 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A) and
439 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A) should be used to explain
440 // atomic (lock-free) synchronization to race detectors:
441 // the race detector will infer a happens-before arc from the former to the
442 // latter when they share the same argument pointer.
444 // The most frequent use case for these macros (and the only case in the
445 // current implementation of the library) is atomic reference counting:
446 // void _M_remove_reference()
448 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&this->_M_refcount);
449 // if (__gnu_cxx::__exchange_and_add_dispatch(&this->_M_refcount, -1) <= 0)
451 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&this->_M_refcount);
455 // The annotations in this example tell the race detector that all memory
456 // accesses occurred when the refcount was positive do not race with
457 // memory accesses which occurred after the refcount became zero.
458 #ifndef _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE
459 # define _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A)
461 #ifndef _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER
462 # define _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A)
465 // Macros for C linkage: define extern "C" linkage only when using C++.
466 # define _GLIBCXX_BEGIN_EXTERN_C extern "C" {
467 # define _GLIBCXX_END_EXTERN_C }
469 #else // !__cplusplus
470 # define _GLIBCXX_BEGIN_EXTERN_C
471 # define _GLIBCXX_END_EXTERN_C
477 // Pick up any OS-specific definitions.
478 #include <bits/os_defines.h>
480 // Pick up any CPU-specific definitions.
481 #include <bits/cpu_defines.h>
483 // If platform uses neither visibility nor psuedo-visibility,
484 // specify empty default for namespace annotation macros.
485 #ifndef _GLIBCXX_PSEUDO_VISIBILITY
486 # define _GLIBCXX_PSEUDO_VISIBILITY(V)
489 // Certain function definitions that are meant to be overridable from
490 // user code are decorated with this macro. For some targets, this
491 // macro causes these definitions to be weak.
492 #ifndef _GLIBCXX_WEAK_DEFINITION
493 # define _GLIBCXX_WEAK_DEFINITION
497 // The remainder of the prewritten config is automatic; all the
498 // user hooks are listed above.
500 // Create a boolean flag to be used to determine if --fast-math is set.
502 # define _GLIBCXX_FAST_MATH 1
504 # define _GLIBCXX_FAST_MATH 0
507 // This marks string literals in header files to be extracted for eventual
508 // translation. It is primarily used for messages in thrown exceptions; see
509 // src/functexcept.cc. We use __N because the more traditional _N is used
510 // for something else under certain OSes (see BADNAMES).
511 #define __N(msgid) (msgid)
513 // For example, <windows.h> is known to #define min and max as macros...
517 // End of prewritten config; the settings discovered at configure time follow.