1 // Predefined symbols and macros -*- C++ -*-
3 // Copyright (C) 1997-2018 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 major release number for the GCC release the C++ library belongs to.
34 #define _GLIBCXX_RELEASE
36 // The datestamp of the C++ library in compressed ISO date format.
39 // Macros for various attributes.
44 // _GLIBCXX_VISIBILITY
46 # define _GLIBCXX_PURE __attribute__ ((__pure__))
49 #ifndef _GLIBCXX_CONST
50 # define _GLIBCXX_CONST __attribute__ ((__const__))
53 #ifndef _GLIBCXX_NORETURN
54 # define _GLIBCXX_NORETURN __attribute__ ((__noreturn__))
58 #ifndef _GLIBCXX_NOTHROW
60 # define _GLIBCXX_NOTHROW __attribute__((__nothrow__))
64 // Macros for visibility attributes.
65 // _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
66 // _GLIBCXX_VISIBILITY
67 #define _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
69 #if _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
70 # define _GLIBCXX_VISIBILITY(V) __attribute__ ((__visibility__ (#V)))
72 // If this is not supplied by the OS-specific or CPU-specific
73 // headers included below, it will be defined to an empty default.
74 # define _GLIBCXX_VISIBILITY(V) _GLIBCXX_PSEUDO_VISIBILITY(V)
77 // Macros for deprecated attributes.
78 // _GLIBCXX_USE_DEPRECATED
79 // _GLIBCXX_DEPRECATED
80 // _GLIBCXX17_DEPRECATED
81 #ifndef _GLIBCXX_USE_DEPRECATED
82 # define _GLIBCXX_USE_DEPRECATED 1
85 #if defined(__DEPRECATED) && (__cplusplus >= 201103L)
86 # define _GLIBCXX_DEPRECATED __attribute__ ((__deprecated__))
88 # define _GLIBCXX_DEPRECATED
91 #if defined(__DEPRECATED) && (__cplusplus >= 201703L)
92 # define _GLIBCXX17_DEPRECATED [[__deprecated__]]
94 # define _GLIBCXX17_DEPRECATED
97 // Macros for ABI tag attributes.
98 #ifndef _GLIBCXX_ABI_TAG_CXX11
99 # define _GLIBCXX_ABI_TAG_CXX11 __attribute ((__abi_tag__ ("cxx11")))
105 // Macro for constexpr, to support in mixed 03/0x mode.
106 #ifndef _GLIBCXX_CONSTEXPR
107 # if __cplusplus >= 201103L
108 # define _GLIBCXX_CONSTEXPR constexpr
109 # define _GLIBCXX_USE_CONSTEXPR constexpr
111 # define _GLIBCXX_CONSTEXPR
112 # define _GLIBCXX_USE_CONSTEXPR const
116 #ifndef _GLIBCXX14_CONSTEXPR
117 # if __cplusplus >= 201402L
118 # define _GLIBCXX14_CONSTEXPR constexpr
120 # define _GLIBCXX14_CONSTEXPR
124 #ifndef _GLIBCXX17_CONSTEXPR
125 # if __cplusplus >= 201703L
126 # define _GLIBCXX17_CONSTEXPR constexpr
128 # define _GLIBCXX17_CONSTEXPR
132 #ifndef _GLIBCXX20_CONSTEXPR
133 # if __cplusplus > 201703L
134 # define _GLIBCXX20_CONSTEXPR constexpr
136 # define _GLIBCXX20_CONSTEXPR
140 #ifndef _GLIBCXX17_INLINE
141 # if __cplusplus >= 201703L
142 # define _GLIBCXX17_INLINE inline
144 # define _GLIBCXX17_INLINE
148 // Macro for noexcept, to support in mixed 03/0x mode.
149 #ifndef _GLIBCXX_NOEXCEPT
150 # if __cplusplus >= 201103L
151 # define _GLIBCXX_NOEXCEPT noexcept
152 # define _GLIBCXX_NOEXCEPT_IF(_COND) noexcept(_COND)
153 # define _GLIBCXX_USE_NOEXCEPT noexcept
154 # define _GLIBCXX_THROW(_EXC)
156 # define _GLIBCXX_NOEXCEPT
157 # define _GLIBCXX_NOEXCEPT_IF(_COND)
158 # define _GLIBCXX_USE_NOEXCEPT throw()
159 # define _GLIBCXX_THROW(_EXC) throw(_EXC)
163 #ifndef _GLIBCXX_NOTHROW
164 # define _GLIBCXX_NOTHROW _GLIBCXX_USE_NOEXCEPT
167 #ifndef _GLIBCXX_THROW_OR_ABORT
168 # if __cpp_exceptions
169 # define _GLIBCXX_THROW_OR_ABORT(_EXC) (throw (_EXC))
171 # define _GLIBCXX_THROW_OR_ABORT(_EXC) (__builtin_abort())
175 #if __cpp_noexcept_function_type
176 #define _GLIBCXX_NOEXCEPT_PARM , bool _NE
177 #define _GLIBCXX_NOEXCEPT_QUAL noexcept (_NE)
179 #define _GLIBCXX_NOEXCEPT_PARM
180 #define _GLIBCXX_NOEXCEPT_QUAL
183 // Macro for extern template, ie controlling template linkage via use
184 // of extern keyword on template declaration. As documented in the g++
185 // manual, it inhibits all implicit instantiations and is used
186 // throughout the library to avoid multiple weak definitions for
187 // required types that are already explicitly instantiated in the
188 // library binary. This substantially reduces the binary size of
189 // resulting executables.
190 // Special case: _GLIBCXX_EXTERN_TEMPLATE == -1 disallows extern
191 // templates only in basic_string, thus activating its debug-mode
192 // checks even at -O0.
193 #define _GLIBCXX_EXTERN_TEMPLATE
196 Outline of libstdc++ namespaces.
200 namespace __debug { }
201 namespace __parallel { }
202 namespace __profile { }
203 namespace __cxx1998 { }
206 namespace __variant { } // C++17
209 namespace rel_ops { }
213 namespace placeholders { }
214 namespace regex_constants { }
215 namespace __detail { }
220 namespace decimal { }
222 namespace chrono { } // C++11
223 namespace placeholders { } // C++11
224 namespace regex_constants { } // C++11
225 namespace this_thread { } // C++11
226 inline namespace literals { // C++14
227 inline namespace chrono_literals { } // C++14
228 inline namespace complex_literals { } // C++14
229 inline namespace string_literals { } // C++14
230 inline namespace string_view_literals { } // C++17
238 namespace __detail { }
241 For full details see:
242 http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespaces.html
246 typedef __SIZE_TYPE__ size_t;
247 typedef __PTRDIFF_TYPE__ ptrdiff_t;
249 #if __cplusplus >= 201103L
250 typedef decltype(nullptr) nullptr_t;
254 #define _GLIBCXX_USE_DUAL_ABI
256 #if ! _GLIBCXX_USE_DUAL_ABI
257 // Ignore any pre-defined value of _GLIBCXX_USE_CXX11_ABI
258 # undef _GLIBCXX_USE_CXX11_ABI
261 #ifndef _GLIBCXX_USE_CXX11_ABI
262 #define _GLIBCXX_USE_CXX11_ABI
265 #if _GLIBCXX_USE_CXX11_ABI
268 inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
272 inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
274 # define _GLIBCXX_NAMESPACE_CXX11 __cxx11::
275 # define _GLIBCXX_BEGIN_NAMESPACE_CXX11 namespace __cxx11 {
276 # define _GLIBCXX_END_NAMESPACE_CXX11 }
277 # define _GLIBCXX_DEFAULT_ABI_TAG _GLIBCXX_ABI_TAG_CXX11
279 # define _GLIBCXX_NAMESPACE_CXX11
280 # define _GLIBCXX_BEGIN_NAMESPACE_CXX11
281 # define _GLIBCXX_END_NAMESPACE_CXX11
282 # define _GLIBCXX_DEFAULT_ABI_TAG
285 // Defined if inline namespaces are used for versioning.
286 #define _GLIBCXX_INLINE_VERSION
288 // Inline namespace for symbol versioning.
289 #if _GLIBCXX_INLINE_VERSION
290 # define _GLIBCXX_BEGIN_NAMESPACE_VERSION namespace __8 {
291 # define _GLIBCXX_END_NAMESPACE_VERSION }
295 inline _GLIBCXX_BEGIN_NAMESPACE_VERSION
296 #if __cplusplus >= 201402L
297 inline namespace literals {
298 inline namespace chrono_literals { }
299 inline namespace complex_literals { }
300 inline namespace string_literals { }
301 #if __cplusplus > 201402L
302 inline namespace string_view_literals { }
306 _GLIBCXX_END_NAMESPACE_VERSION
311 inline _GLIBCXX_BEGIN_NAMESPACE_VERSION
312 _GLIBCXX_END_NAMESPACE_VERSION
316 # define _GLIBCXX_BEGIN_NAMESPACE_VERSION
317 # define _GLIBCXX_END_NAMESPACE_VERSION
320 // Inline namespaces for special modes: debug, parallel, profile.
321 #if defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_PARALLEL) \
322 || defined(_GLIBCXX_PROFILE)
325 _GLIBCXX_BEGIN_NAMESPACE_VERSION
327 // Non-inline namespace for components replaced by alternates in active mode.
330 # if _GLIBCXX_USE_CXX11_ABI
331 inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
335 _GLIBCXX_END_NAMESPACE_VERSION
337 // Inline namespace for debug mode.
338 # ifdef _GLIBCXX_DEBUG
339 inline namespace __debug { }
342 // Inline namespaces for parallel mode.
343 # ifdef _GLIBCXX_PARALLEL
344 inline namespace __parallel { }
347 // Inline namespaces for profile mode
348 # ifdef _GLIBCXX_PROFILE
349 inline namespace __profile { }
353 // Check for invalid usage and unsupported mixed-mode use.
354 # if defined(_GLIBCXX_DEBUG) && defined(_GLIBCXX_PARALLEL)
355 # error illegal use of multiple inlined namespaces
357 # if defined(_GLIBCXX_PROFILE) && defined(_GLIBCXX_DEBUG)
358 # error illegal use of multiple inlined namespaces
360 # if defined(_GLIBCXX_PROFILE) && defined(_GLIBCXX_PARALLEL)
361 # error illegal use of multiple inlined namespaces
364 // Check for invalid use due to lack for weak symbols.
365 # if __NO_INLINE__ && !__GXX_WEAK__
366 # warning currently using inlined namespace mode which may fail \
367 without inlining due to lack of weak symbols
371 // Macros for namespace scope. Either namespace std:: or the name
372 // of some nested namespace within it corresponding to the active mode.
376 // Macros for opening/closing conditional namespaces.
377 // _GLIBCXX_BEGIN_NAMESPACE_ALGO
378 // _GLIBCXX_END_NAMESPACE_ALGO
379 // _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
380 // _GLIBCXX_END_NAMESPACE_CONTAINER
381 #if defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_PROFILE)
382 # define _GLIBCXX_STD_C __cxx1998
383 # define _GLIBCXX_BEGIN_NAMESPACE_CONTAINER \
384 namespace _GLIBCXX_STD_C {
385 # define _GLIBCXX_END_NAMESPACE_CONTAINER }
387 # define _GLIBCXX_STD_C std
388 # define _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
389 # define _GLIBCXX_END_NAMESPACE_CONTAINER
392 #ifdef _GLIBCXX_PARALLEL
393 # define _GLIBCXX_STD_A __cxx1998
394 # define _GLIBCXX_BEGIN_NAMESPACE_ALGO \
395 namespace _GLIBCXX_STD_A {
396 # define _GLIBCXX_END_NAMESPACE_ALGO }
398 # define _GLIBCXX_STD_A std
399 # define _GLIBCXX_BEGIN_NAMESPACE_ALGO
400 # define _GLIBCXX_END_NAMESPACE_ALGO
403 // GLIBCXX_ABI Deprecated
404 // Define if compatibility should be provided for -mlong-double-64.
405 #undef _GLIBCXX_LONG_DOUBLE_COMPAT
407 // Inline namespace for long double 128 mode.
408 #if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined __LONG_DOUBLE_128__
411 inline namespace __gnu_cxx_ldbl128 { }
413 # define _GLIBCXX_NAMESPACE_LDBL __gnu_cxx_ldbl128::
414 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL namespace __gnu_cxx_ldbl128 {
415 # define _GLIBCXX_END_NAMESPACE_LDBL }
417 # define _GLIBCXX_NAMESPACE_LDBL
418 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL
419 # define _GLIBCXX_END_NAMESPACE_LDBL
421 #if _GLIBCXX_USE_CXX11_ABI
422 # define _GLIBCXX_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_NAMESPACE_CXX11
423 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_BEGIN_NAMESPACE_CXX11
424 # define _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_END_NAMESPACE_CXX11
426 # define _GLIBCXX_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_NAMESPACE_LDBL
427 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_BEGIN_NAMESPACE_LDBL
428 # define _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_END_NAMESPACE_LDBL
431 // Debug Mode implies checking assertions.
432 #if defined(_GLIBCXX_DEBUG) && !defined(_GLIBCXX_ASSERTIONS)
433 # define _GLIBCXX_ASSERTIONS 1
436 // Disable std::string explicit instantiation declarations in order to assert.
437 #ifdef _GLIBCXX_ASSERTIONS
438 # undef _GLIBCXX_EXTERN_TEMPLATE
439 # define _GLIBCXX_EXTERN_TEMPLATE -1
443 #if defined(_GLIBCXX_ASSERTIONS) \
444 || defined(_GLIBCXX_PARALLEL) || defined(_GLIBCXX_PARALLEL_ASSERTIONS)
447 // Avoid the use of assert, because we're trying to keep the <cassert>
448 // include out of the mix.
449 extern "C++" inline void
450 __replacement_assert(const char* __file, int __line,
451 const char* __function, const char* __condition)
453 __builtin_printf("%s:%d: %s: Assertion '%s' failed.\n", __file, __line,
454 __function, __condition);
458 #define __glibcxx_assert_impl(_Condition) \
461 if (! (_Condition)) \
462 std::__replacement_assert(__FILE__, __LINE__, __PRETTY_FUNCTION__, \
467 #if defined(_GLIBCXX_ASSERTIONS)
468 # define __glibcxx_assert(_Condition) __glibcxx_assert_impl(_Condition)
470 # define __glibcxx_assert(_Condition)
473 // Macros for race detectors.
474 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A) and
475 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A) should be used to explain
476 // atomic (lock-free) synchronization to race detectors:
477 // the race detector will infer a happens-before arc from the former to the
478 // latter when they share the same argument pointer.
480 // The most frequent use case for these macros (and the only case in the
481 // current implementation of the library) is atomic reference counting:
482 // void _M_remove_reference()
484 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&this->_M_refcount);
485 // if (__gnu_cxx::__exchange_and_add_dispatch(&this->_M_refcount, -1) <= 0)
487 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&this->_M_refcount);
491 // The annotations in this example tell the race detector that all memory
492 // accesses occurred when the refcount was positive do not race with
493 // memory accesses which occurred after the refcount became zero.
494 #ifndef _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE
495 # define _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A)
497 #ifndef _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER
498 # define _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A)
501 // Macros for C linkage: define extern "C" linkage only when using C++.
502 # define _GLIBCXX_BEGIN_EXTERN_C extern "C" {
503 # define _GLIBCXX_END_EXTERN_C }
505 #define _GLIBCXX_USE_ALLOCATOR_NEW
507 #else // !__cplusplus
508 # define _GLIBCXX_BEGIN_EXTERN_C
509 # define _GLIBCXX_END_EXTERN_C
515 // Pick up any OS-specific definitions.
516 #include <bits/os_defines.h>
518 // Pick up any CPU-specific definitions.
519 #include <bits/cpu_defines.h>
521 // If platform uses neither visibility nor psuedo-visibility,
522 // specify empty default for namespace annotation macros.
523 #ifndef _GLIBCXX_PSEUDO_VISIBILITY
524 # define _GLIBCXX_PSEUDO_VISIBILITY(V)
527 // Certain function definitions that are meant to be overridable from
528 // user code are decorated with this macro. For some targets, this
529 // macro causes these definitions to be weak.
530 #ifndef _GLIBCXX_WEAK_DEFINITION
531 # define _GLIBCXX_WEAK_DEFINITION
534 // By default, we assume that __GXX_WEAK__ also means that there is support
535 // for declaring functions as weak while not defining such functions. This
536 // allows for referring to functions provided by other libraries (e.g.,
537 // libitm) without depending on them if the respective features are not used.
538 #ifndef _GLIBCXX_USE_WEAK_REF
539 # define _GLIBCXX_USE_WEAK_REF __GXX_WEAK__
542 // Conditionally enable annotations for the Transactional Memory TS on C++11.
543 // Most of the following conditions are due to limitations in the current
545 #if __cplusplus >= 201103L && _GLIBCXX_USE_CXX11_ABI \
546 && _GLIBCXX_USE_DUAL_ABI && __cpp_transactional_memory >= 201500L \
547 && !_GLIBCXX_FULLY_DYNAMIC_STRING && _GLIBCXX_USE_WEAK_REF \
548 && _GLIBCXX_USE_ALLOCATOR_NEW
549 #define _GLIBCXX_TXN_SAFE transaction_safe
550 #define _GLIBCXX_TXN_SAFE_DYN transaction_safe_dynamic
552 #define _GLIBCXX_TXN_SAFE
553 #define _GLIBCXX_TXN_SAFE_DYN
556 #if __cplusplus > 201402L
557 // In C++17 mathematical special functions are in namespace std.
558 # define _GLIBCXX_USE_STD_SPEC_FUNCS 1
559 #elif __cplusplus >= 201103L && __STDCPP_WANT_MATH_SPEC_FUNCS__ != 0
560 // For C++11 and C++14 they are in namespace std when requested.
561 # define _GLIBCXX_USE_STD_SPEC_FUNCS 1
564 // The remainder of the prewritten config is automatic; all the
565 // user hooks are listed above.
567 // Create a boolean flag to be used to determine if --fast-math is set.
569 # define _GLIBCXX_FAST_MATH 1
571 # define _GLIBCXX_FAST_MATH 0
574 // This marks string literals in header files to be extracted for eventual
575 // translation. It is primarily used for messages in thrown exceptions; see
576 // src/functexcept.cc. We use __N because the more traditional _N is used
577 // for something else under certain OSes (see BADNAMES).
578 #define __N(msgid) (msgid)
580 // For example, <windows.h> is known to #define min and max as macros...
584 // N.B. these _GLIBCXX_USE_C99_XXX macros are defined unconditionally
585 // so they should be tested with #if not with #ifdef.
586 #if __cplusplus >= 201103L
587 # ifndef _GLIBCXX_USE_C99_MATH
588 # define _GLIBCXX_USE_C99_MATH _GLIBCXX11_USE_C99_MATH
590 # ifndef _GLIBCXX_USE_C99_COMPLEX
591 # define _GLIBCXX_USE_C99_COMPLEX _GLIBCXX11_USE_C99_COMPLEX
593 # ifndef _GLIBCXX_USE_C99_STDIO
594 # define _GLIBCXX_USE_C99_STDIO _GLIBCXX11_USE_C99_STDIO
596 # ifndef _GLIBCXX_USE_C99_STDLIB
597 # define _GLIBCXX_USE_C99_STDLIB _GLIBCXX11_USE_C99_STDLIB
599 # ifndef _GLIBCXX_USE_C99_WCHAR
600 # define _GLIBCXX_USE_C99_WCHAR _GLIBCXX11_USE_C99_WCHAR
603 # ifndef _GLIBCXX_USE_C99_MATH
604 # define _GLIBCXX_USE_C99_MATH _GLIBCXX98_USE_C99_MATH
606 # ifndef _GLIBCXX_USE_C99_COMPLEX
607 # define _GLIBCXX_USE_C99_COMPLEX _GLIBCXX98_USE_C99_COMPLEX
609 # ifndef _GLIBCXX_USE_C99_STDIO
610 # define _GLIBCXX_USE_C99_STDIO _GLIBCXX98_USE_C99_STDIO
612 # ifndef _GLIBCXX_USE_C99_STDLIB
613 # define _GLIBCXX_USE_C99_STDLIB _GLIBCXX98_USE_C99_STDLIB
615 # ifndef _GLIBCXX_USE_C99_WCHAR
616 # define _GLIBCXX_USE_C99_WCHAR _GLIBCXX98_USE_C99_WCHAR
620 /* Define if __float128 is supported on this host. */
621 #if defined(__FLOAT128__) || defined(__SIZEOF_FLOAT128__)
622 #define _GLIBCXX_USE_FLOAT128
625 // End of prewritten config; the settings discovered at configure time follow.