1 // Predefined symbols and macros -*- C++ -*-
3 // Copyright (C) 1997-2016 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 #ifndef _GLIBCXX17_CONSTEXPR
115 # if __cplusplus > 201402L
116 # define _GLIBCXX17_CONSTEXPR constexpr
118 # define _GLIBCXX17_CONSTEXPR
122 // Macro for noexcept, to support in mixed 03/0x mode.
123 #ifndef _GLIBCXX_NOEXCEPT
124 # if __cplusplus >= 201103L
125 # define _GLIBCXX_NOEXCEPT noexcept
126 # define _GLIBCXX_NOEXCEPT_IF(_COND) noexcept(_COND)
127 # define _GLIBCXX_USE_NOEXCEPT noexcept
128 # define _GLIBCXX_THROW(_EXC)
130 # define _GLIBCXX_NOEXCEPT
131 # define _GLIBCXX_NOEXCEPT_IF(_COND)
132 # define _GLIBCXX_USE_NOEXCEPT throw()
133 # define _GLIBCXX_THROW(_EXC) throw(_EXC)
137 #ifndef _GLIBCXX_NOTHROW
138 # define _GLIBCXX_NOTHROW _GLIBCXX_USE_NOEXCEPT
141 #ifndef _GLIBCXX_THROW_OR_ABORT
142 # if __cpp_exceptions
143 # define _GLIBCXX_THROW_OR_ABORT(_EXC) (throw (_EXC))
145 # define _GLIBCXX_THROW_OR_ABORT(_EXC) (__builtin_abort())
149 #if __cpp_noexcept_function_type
150 #define _GLIBCXX_NOEXCEPT_PARM , bool _N
151 #define _GLIBCXX_NOEXCEPT_QUAL noexcept (_N)
153 #define _GLIBCXX_NOEXCEPT_PARM
154 #define _GLIBCXX_NOEXCEPT_QUAL
157 // Macro for extern template, ie controlling template linkage via use
158 // of extern keyword on template declaration. As documented in the g++
159 // manual, it inhibits all implicit instantiations and is used
160 // throughout the library to avoid multiple weak definitions for
161 // required types that are already explicitly instantiated in the
162 // library binary. This substantially reduces the binary size of
163 // resulting executables.
164 // Special case: _GLIBCXX_EXTERN_TEMPLATE == -1 disallows extern
165 // templates only in basic_string, thus activating its debug-mode
166 // checks even at -O0.
167 #define _GLIBCXX_EXTERN_TEMPLATE
170 Outline of libstdc++ namespaces.
174 namespace __debug { }
175 namespace __parallel { }
176 namespace __profile { }
177 namespace __cxx1998 { }
179 namespace __detail { }
181 namespace rel_ops { }
185 namespace placeholders { }
186 namespace regex_constants { }
187 namespace __detail { }
192 namespace decimal { }
195 namespace placeholders { }
196 namespace regex_constants { }
197 namespace this_thread { }
198 inline namespace literals {
199 inline namespace chrono_literals { }
200 inline namespace complex_literals { }
201 inline namespace string_literals { }
209 namespace __detail { }
212 For full details see:
213 http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespaces.html
217 typedef __SIZE_TYPE__ size_t;
218 typedef __PTRDIFF_TYPE__ ptrdiff_t;
220 #if __cplusplus >= 201103L
221 typedef decltype(nullptr) nullptr_t;
225 #define _GLIBCXX_USE_DUAL_ABI
227 #if ! _GLIBCXX_USE_DUAL_ABI
228 // Ignore any pre-defined value of _GLIBCXX_USE_CXX11_ABI
229 # undef _GLIBCXX_USE_CXX11_ABI
232 #ifndef _GLIBCXX_USE_CXX11_ABI
233 #define _GLIBCXX_USE_CXX11_ABI
236 #if _GLIBCXX_USE_CXX11_ABI
239 inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
243 inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
245 # define _GLIBCXX_NAMESPACE_CXX11 __cxx11::
246 # define _GLIBCXX_BEGIN_NAMESPACE_CXX11 namespace __cxx11 {
247 # define _GLIBCXX_END_NAMESPACE_CXX11 }
248 # define _GLIBCXX_DEFAULT_ABI_TAG _GLIBCXX_ABI_TAG_CXX11
250 # define _GLIBCXX_NAMESPACE_CXX11
251 # define _GLIBCXX_BEGIN_NAMESPACE_CXX11
252 # define _GLIBCXX_END_NAMESPACE_CXX11
253 # define _GLIBCXX_DEFAULT_ABI_TAG
257 // Defined if inline namespaces are used for versioning.
258 #define _GLIBCXX_INLINE_VERSION
260 // Inline namespace for symbol versioning.
261 #if _GLIBCXX_INLINE_VERSION
265 inline namespace __7 { }
267 namespace rel_ops { inline namespace __7 { } }
271 inline namespace __7 { }
272 namespace placeholders { inline namespace __7 { } }
273 namespace regex_constants { inline namespace __7 { } }
274 namespace __detail { inline namespace __7 { } }
278 { inline namespace __7 { } }
280 namespace decimal { inline namespace __7 { } }
282 namespace chrono { inline namespace __7 { } }
283 namespace placeholders { inline namespace __7 { } }
284 namespace regex_constants { inline namespace __7 { } }
285 namespace this_thread { inline namespace __7 { } }
287 inline namespace literals {
288 inline namespace chrono_literals { inline namespace __7 { } }
289 inline namespace complex_literals { inline namespace __7 { } }
290 inline namespace string_literals { inline namespace __7 { } }
294 inline namespace __7 { }
295 namespace __variant { inline namespace __7 { } }
301 inline namespace __7 { }
302 namespace __detail { inline namespace __7 { } }
304 # define _GLIBCXX_BEGIN_NAMESPACE_VERSION namespace __7 {
305 # define _GLIBCXX_END_NAMESPACE_VERSION }
307 # define _GLIBCXX_BEGIN_NAMESPACE_VERSION
308 # define _GLIBCXX_END_NAMESPACE_VERSION
312 // Inline namespaces for special modes: debug, parallel, profile.
313 #if defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_PARALLEL) \
314 || defined(_GLIBCXX_PROFILE)
317 // Non-inline namespace for components replaced by alternates in active mode.
320 # if _GLIBCXX_INLINE_VERSION
321 inline namespace __7 { }
324 # if _GLIBCXX_USE_CXX11_ABI
325 inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
329 // Inline namespace for debug mode.
330 # ifdef _GLIBCXX_DEBUG
331 inline namespace __debug { }
334 // Inline namespaces for parallel mode.
335 # ifdef _GLIBCXX_PARALLEL
336 inline namespace __parallel { }
339 // Inline namespaces for profile mode
340 # ifdef _GLIBCXX_PROFILE
341 inline namespace __profile { }
345 // Check for invalid usage and unsupported mixed-mode use.
346 # if defined(_GLIBCXX_DEBUG) && defined(_GLIBCXX_PARALLEL)
347 # error illegal use of multiple inlined namespaces
349 # if defined(_GLIBCXX_PROFILE) && defined(_GLIBCXX_DEBUG)
350 # error illegal use of multiple inlined namespaces
352 # if defined(_GLIBCXX_PROFILE) && defined(_GLIBCXX_PARALLEL)
353 # error illegal use of multiple inlined namespaces
356 // Check for invalid use due to lack for weak symbols.
357 # if __NO_INLINE__ && !__GXX_WEAK__
358 # warning currently using inlined namespace mode which may fail \
359 without inlining due to lack of weak symbols
363 // Macros for namespace scope. Either namespace std:: or the name
364 // of some nested namespace within it corresponding to the active mode.
368 // Macros for opening/closing conditional namespaces.
369 // _GLIBCXX_BEGIN_NAMESPACE_ALGO
370 // _GLIBCXX_END_NAMESPACE_ALGO
371 // _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
372 // _GLIBCXX_END_NAMESPACE_CONTAINER
373 #if defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_PROFILE)
374 # define _GLIBCXX_STD_C __cxx1998
375 # define _GLIBCXX_BEGIN_NAMESPACE_CONTAINER \
376 namespace _GLIBCXX_STD_C { _GLIBCXX_BEGIN_NAMESPACE_VERSION
377 # define _GLIBCXX_END_NAMESPACE_CONTAINER \
378 _GLIBCXX_END_NAMESPACE_VERSION }
380 # define _GLIBCXX_STD_C std
381 # define _GLIBCXX_BEGIN_NAMESPACE_CONTAINER _GLIBCXX_BEGIN_NAMESPACE_VERSION
382 # define _GLIBCXX_END_NAMESPACE_CONTAINER _GLIBCXX_END_NAMESPACE_VERSION
385 #ifdef _GLIBCXX_PARALLEL
386 # define _GLIBCXX_STD_A __cxx1998
387 # define _GLIBCXX_BEGIN_NAMESPACE_ALGO \
388 namespace _GLIBCXX_STD_A { _GLIBCXX_BEGIN_NAMESPACE_VERSION
389 # define _GLIBCXX_END_NAMESPACE_ALGO \
390 _GLIBCXX_END_NAMESPACE_VERSION }
392 # define _GLIBCXX_STD_A std
393 # define _GLIBCXX_BEGIN_NAMESPACE_ALGO _GLIBCXX_BEGIN_NAMESPACE_VERSION
394 # define _GLIBCXX_END_NAMESPACE_ALGO _GLIBCXX_END_NAMESPACE_VERSION
397 // GLIBCXX_ABI Deprecated
398 // Define if compatibility should be provided for -mlong-double-64.
399 #undef _GLIBCXX_LONG_DOUBLE_COMPAT
401 // Inline namespace for long double 128 mode.
402 #if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined __LONG_DOUBLE_128__
405 inline namespace __gnu_cxx_ldbl128 { }
407 # define _GLIBCXX_NAMESPACE_LDBL __gnu_cxx_ldbl128::
408 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL namespace __gnu_cxx_ldbl128 {
409 # define _GLIBCXX_END_NAMESPACE_LDBL }
411 # define _GLIBCXX_NAMESPACE_LDBL
412 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL
413 # define _GLIBCXX_END_NAMESPACE_LDBL
415 #if _GLIBCXX_USE_CXX11_ABI
416 # define _GLIBCXX_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_NAMESPACE_CXX11
417 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_BEGIN_NAMESPACE_CXX11
418 # define _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_END_NAMESPACE_CXX11
420 # define _GLIBCXX_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_NAMESPACE_LDBL
421 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_BEGIN_NAMESPACE_LDBL
422 # define _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11 _GLIBCXX_END_NAMESPACE_LDBL
425 // Debug Mode implies checking assertions.
426 #ifdef _GLIBCXX_DEBUG
427 # define _GLIBCXX_ASSERTIONS 1
430 // Disable std::string explicit instantiation declarations in order to assert.
431 #ifdef _GLIBCXX_ASSERTIONS
432 # undef _GLIBCXX_EXTERN_TEMPLATE
433 # define _GLIBCXX_EXTERN_TEMPLATE -1
437 #if !defined(_GLIBCXX_ASSERTIONS) && !defined(_GLIBCXX_PARALLEL)
438 # define __glibcxx_assert(_Condition)
442 // Avoid the use of assert, because we're trying to keep the <cassert>
443 // include out of the mix.
445 __replacement_assert(const char* __file, int __line,
446 const char* __function, const char* __condition)
448 __builtin_printf("%s:%d: %s: Assertion '%s' failed.\n", __file, __line,
449 __function, __condition);
453 #define __glibcxx_assert(_Condition) \
456 if (! (_Condition)) \
457 std::__replacement_assert(__FILE__, __LINE__, __PRETTY_FUNCTION__, \
462 // Macros for race detectors.
463 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A) and
464 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A) should be used to explain
465 // atomic (lock-free) synchronization to race detectors:
466 // the race detector will infer a happens-before arc from the former to the
467 // latter when they share the same argument pointer.
469 // The most frequent use case for these macros (and the only case in the
470 // current implementation of the library) is atomic reference counting:
471 // void _M_remove_reference()
473 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&this->_M_refcount);
474 // if (__gnu_cxx::__exchange_and_add_dispatch(&this->_M_refcount, -1) <= 0)
476 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&this->_M_refcount);
480 // The annotations in this example tell the race detector that all memory
481 // accesses occurred when the refcount was positive do not race with
482 // memory accesses which occurred after the refcount became zero.
483 #ifndef _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE
484 # define _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A)
486 #ifndef _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER
487 # define _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A)
490 // Macros for C linkage: define extern "C" linkage only when using C++.
491 # define _GLIBCXX_BEGIN_EXTERN_C extern "C" {
492 # define _GLIBCXX_END_EXTERN_C }
494 #define _GLIBCXX_USE_ALLOCATOR_NEW
496 #else // !__cplusplus
497 # define _GLIBCXX_BEGIN_EXTERN_C
498 # define _GLIBCXX_END_EXTERN_C
504 // Pick up any OS-specific definitions.
505 #include <bits/os_defines.h>
507 // Pick up any CPU-specific definitions.
508 #include <bits/cpu_defines.h>
510 // If platform uses neither visibility nor psuedo-visibility,
511 // specify empty default for namespace annotation macros.
512 #ifndef _GLIBCXX_PSEUDO_VISIBILITY
513 # define _GLIBCXX_PSEUDO_VISIBILITY(V)
516 // Certain function definitions that are meant to be overridable from
517 // user code are decorated with this macro. For some targets, this
518 // macro causes these definitions to be weak.
519 #ifndef _GLIBCXX_WEAK_DEFINITION
520 # define _GLIBCXX_WEAK_DEFINITION
523 // By default, we assume that __GXX_WEAK__ also means that there is support
524 // for declaring functions as weak while not defining such functions. This
525 // allows for referring to functions provided by other libraries (e.g.,
526 // libitm) without depending on them if the respective features are not used.
527 #ifndef _GLIBCXX_USE_WEAK_REF
528 # define _GLIBCXX_USE_WEAK_REF __GXX_WEAK__
531 // Conditionally enable annotations for the Transactional Memory TS on C++11.
532 // Most of the following conditions are due to limitations in the current
534 #if __cplusplus >= 201103L && _GLIBCXX_USE_CXX11_ABI \
535 && _GLIBCXX_USE_DUAL_ABI && __cpp_transactional_memory >= 201505L \
536 && !_GLIBCXX_FULLY_DYNAMIC_STRING && _GLIBCXX_USE_WEAK_REF \
537 && _GLIBCXX_USE_ALLOCATOR_NEW
538 #define _GLIBCXX_TXN_SAFE transaction_safe
539 #define _GLIBCXX_TXN_SAFE_DYN transaction_safe_dynamic
541 #define _GLIBCXX_TXN_SAFE
542 #define _GLIBCXX_TXN_SAFE_DYN
545 #if __cplusplus > 201402L
546 // In C++17 mathematical special functions are in namespace std.
547 # define _GLIBCXX_USE_STD_SPEC_FUNCS 1
548 #elif __cplusplus >= 201103L && __STDCPP_WANT_MATH_SPEC_FUNCS__ != 0
549 // For C++11 and C++14 they are in namespace std when requested.
550 # define _GLIBCXX_USE_STD_SPEC_FUNCS 1
553 // The remainder of the prewritten config is automatic; all the
554 // user hooks are listed above.
556 // Create a boolean flag to be used to determine if --fast-math is set.
558 # define _GLIBCXX_FAST_MATH 1
560 # define _GLIBCXX_FAST_MATH 0
563 // This marks string literals in header files to be extracted for eventual
564 // translation. It is primarily used for messages in thrown exceptions; see
565 // src/functexcept.cc. We use __N because the more traditional _N is used
566 // for something else under certain OSes (see BADNAMES).
567 #define __N(msgid) (msgid)
569 // For example, <windows.h> is known to #define min and max as macros...
573 // N.B. these _GLIBCXX_USE_C99_XXX macros are defined unconditionally
574 // so they should be tested with #if not with #ifdef.
575 #if __cplusplus >= 201103L
576 # ifndef _GLIBCXX_USE_C99_MATH
577 # define _GLIBCXX_USE_C99_MATH _GLIBCXX11_USE_C99_MATH
579 # ifndef _GLIBCXX_USE_C99_COMPLEX
580 # define _GLIBCXX_USE_C99_COMPLEX _GLIBCXX11_USE_C99_COMPLEX
582 # ifndef _GLIBCXX_USE_C99_STDIO
583 # define _GLIBCXX_USE_C99_STDIO _GLIBCXX11_USE_C99_STDIO
585 # ifndef _GLIBCXX_USE_C99_STDLIB
586 # define _GLIBCXX_USE_C99_STDLIB _GLIBCXX11_USE_C99_STDLIB
588 # ifndef _GLIBCXX_USE_C99_WCHAR
589 # define _GLIBCXX_USE_C99_WCHAR _GLIBCXX11_USE_C99_WCHAR
592 # ifndef _GLIBCXX_USE_C99_MATH
593 # define _GLIBCXX_USE_C99_MATH _GLIBCXX98_USE_C99_MATH
595 # ifndef _GLIBCXX_USE_C99_COMPLEX
596 # define _GLIBCXX_USE_C99_COMPLEX _GLIBCXX98_USE_C99_COMPLEX
598 # ifndef _GLIBCXX_USE_C99_STDIO
599 # define _GLIBCXX_USE_C99_STDIO _GLIBCXX98_USE_C99_STDIO
601 # ifndef _GLIBCXX_USE_C99_STDLIB
602 # define _GLIBCXX_USE_C99_STDLIB _GLIBCXX98_USE_C99_STDLIB
604 # ifndef _GLIBCXX_USE_C99_WCHAR
605 # define _GLIBCXX_USE_C99_WCHAR _GLIBCXX98_USE_C99_WCHAR
609 // End of prewritten config; the settings discovered at configure time follow.