1 // Predefined symbols and macros -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
4 // 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
6 // This file is part of the GNU ISO C++ Library. This library is free
7 // software; you can redistribute it and/or modify it under the
8 // terms of the GNU General Public License as published by the
9 // Free Software Foundation; either version 3, or (at your option)
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // Under Section 7 of GPL version 3, you are granted additional
18 // permissions described in the GCC Runtime Library Exception, version
19 // 3.1, as published by the Free Software Foundation.
21 // You should have received a copy of the GNU General Public License and
22 // a copy of the GCC Runtime Library Exception along with this program;
23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 // <http://www.gnu.org/licenses/>.
26 /** @file bits/c++config.h
27 * This is an internal header file, included by other library headers.
28 * Do not attempt to use it directly. @headername{iosfwd}
31 #ifndef _GLIBCXX_CXX_CONFIG_H
32 #define _GLIBCXX_CXX_CONFIG_H 1
34 // The current version of the C++ library in compressed ISO date format.
37 // Macros for various attributes.
42 // _GLIBCXX_VISIBILITY
44 # define _GLIBCXX_PURE __attribute__ ((__pure__))
47 #ifndef _GLIBCXX_CONST
48 # define _GLIBCXX_CONST __attribute__ ((__const__))
51 #ifndef _GLIBCXX_NORETURN
52 # define _GLIBCXX_NORETURN __attribute__ ((__noreturn__))
55 #ifndef _GLIBCXX_NOTHROW
57 # define _GLIBCXX_NOTHROW throw()
59 # define _GLIBCXX_NOTHROW __attribute__((__nothrow__))
63 // Macros for visibility attributes.
64 // _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
65 // _GLIBCXX_VISIBILITY
66 #define _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
68 #if _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
69 # define _GLIBCXX_VISIBILITY(V) __attribute__ ((__visibility__ (#V)))
71 // If this is not supplied by the OS-specific or CPU-specific
72 // headers included below, it will be defined to an empty default.
73 # define _GLIBCXX_VISIBILITY(V) _GLIBCXX_PSEUDO_VISIBILITY(V)
76 // Macros for deprecated attributes.
77 // _GLIBCXX_USE_DEPRECATED
78 // _GLIBCXX_DEPRECATED
79 #ifndef _GLIBCXX_USE_DEPRECATED
80 # define _GLIBCXX_USE_DEPRECATED 1
83 #if defined(__DEPRECATED) && defined(__GXX_EXPERIMENTAL_CXX0X__)
84 # define _GLIBCXX_DEPRECATED __attribute__ ((__deprecated__))
86 # define _GLIBCXX_DEPRECATED
91 // Macro for constexpr, to support in mixed 03/0x mode.
92 #ifndef _GLIBCXX_CONSTEXPR
93 # ifdef __GXX_EXPERIMENTAL_CXX0X__
94 # define _GLIBCXX_CONSTEXPR constexpr
95 # define _GLIBCXX_USE_CONSTEXPR constexpr
97 # define _GLIBCXX_CONSTEXPR
98 # define _GLIBCXX_USE_CONSTEXPR const
102 // Macro for noexcept, to support in mixed 03/0x mode.
103 #ifndef _GLIBCXX_NOEXCEPT
104 # ifdef __GXX_EXPERIMENTAL_CXX0X__
105 # define _GLIBCXX_NOEXCEPT noexcept
106 # define _GLIBCXX_USE_NOEXCEPT noexcept
108 # define _GLIBCXX_NOEXCEPT
109 # define _GLIBCXX_USE_NOEXCEPT throw()
113 // Macro for extern template, ie controling template linkage via use
114 // of extern keyword on template declaration. As documented in the g++
115 // manual, it inhibits all implicit instantiations and is used
116 // throughout the library to avoid multiple weak definitions for
117 // required types that are already explicitly instantiated in the
118 // library binary. This substantially reduces the binary size of
119 // resulting executables.
120 // Special case: _GLIBCXX_EXTERN_TEMPLATE == -1 disallows extern
121 // templates only in basic_string, thus activating its debug-mode
122 // checks even at -O0.
123 #define _GLIBCXX_EXTERN_TEMPLATE
126 Outline of libstdc++ namespaces.
130 namespace __debug { }
131 namespace __parallel { }
132 namespace __profile { }
133 namespace __cxx1998 { }
135 namespace __detail { }
137 namespace rel_ops { }
141 namespace placeholders { }
142 namespace regex_constants { }
143 namespace __detail { }
146 namespace decimal { }
149 namespace placeholders { }
150 namespace regex_constants { }
151 namespace this_thread { }
158 namespace __detail { }
161 For full details see:
162 http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespaces.html
166 typedef __SIZE_TYPE__ size_t;
167 typedef __PTRDIFF_TYPE__ ptrdiff_t;
169 #ifdef __GXX_EXPERIMENTAL_CXX0X__
170 typedef decltype(nullptr) nullptr_t;
175 // Defined if inline namespaces are used for versioning.
176 #define _GLIBCXX_INLINE_VERSION
178 // Inline namespace for symbol versioning.
179 #if _GLIBCXX_INLINE_VERSION
182 inline namespace _6 { }
184 namespace rel_ops { inline namespace _6 { } }
188 inline namespace _6 { }
189 namespace placeholders { inline namespace _6 { } }
190 namespace regex_constants { inline namespace _6 { } }
191 namespace __detail { inline namespace _6 { } }
194 namespace decimal { inline namespace _6 { } }
196 namespace chrono { inline namespace _6 { } }
197 namespace placeholders { inline namespace _6 { } }
198 namespace regex_constants { inline namespace _6 { } }
199 namespace this_thread { inline namespace _6 { } }
201 namespace __detail { inline namespace _6 { } }
202 namespace __regex { inline namespace _6 { } }
207 inline namespace _6 { }
208 namespace __detail { inline namespace _6 { } }
210 # define _GLIBCXX_BEGIN_NAMESPACE_VERSION namespace _6 {
211 # define _GLIBCXX_END_NAMESPACE_VERSION }
213 # define _GLIBCXX_BEGIN_NAMESPACE_VERSION
214 # define _GLIBCXX_END_NAMESPACE_VERSION
218 // Inline namespaces for special modes: debug, parallel, profile.
219 #if defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_PARALLEL) \
220 || defined(_GLIBCXX_PROFILE)
223 // Non-inline namespace for components replaced by alternates in active mode.
226 #if _GLIBCXX_INLINE_VERSION
227 inline namespace _6 { }
231 // Inline namespace for debug mode.
232 # ifdef _GLIBCXX_DEBUG
233 inline namespace __debug { }
236 // Inline namespaces for parallel mode.
237 # ifdef _GLIBCXX_PARALLEL
238 inline namespace __parallel { }
241 // Inline namespaces for profile mode
242 # ifdef _GLIBCXX_PROFILE
243 inline namespace __profile { }
247 // Check for invalid usage and unsupported mixed-mode use.
248 # if defined(_GLIBCXX_DEBUG) && defined(_GLIBCXX_PARALLEL)
249 # error illegal use of multiple inlined namespaces
251 # if defined(_GLIBCXX_PROFILE) && defined(_GLIBCXX_DEBUG)
252 # error illegal use of multiple inlined namespaces
254 # if defined(_GLIBCXX_PROFILE) && defined(_GLIBCXX_PARALLEL)
255 # error illegal use of multiple inlined namespaces
258 // Check for invalid use due to lack for weak symbols.
259 # if __NO_INLINE__ && !__GXX_WEAK__
260 # warning currently using inlined namespace mode which may fail \
261 without inlining due to lack of weak symbols
265 // Macros for namespace scope. Either namespace std:: or the name
266 // of some nested namespace within it corresponding to the active mode.
270 // Macros for opening/closing conditional namespaces.
271 // _GLIBCXX_BEGIN_NAMESPACE_ALGO
272 // _GLIBCXX_END_NAMESPACE_ALGO
273 // _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
274 // _GLIBCXX_END_NAMESPACE_CONTAINER
275 #if defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_PROFILE)
276 # define _GLIBCXX_STD_C __cxx1998
277 # define _GLIBCXX_BEGIN_NAMESPACE_CONTAINER \
278 namespace _GLIBCXX_STD_C { _GLIBCXX_BEGIN_NAMESPACE_VERSION
279 # define _GLIBCXX_END_NAMESPACE_CONTAINER \
280 } _GLIBCXX_END_NAMESPACE_VERSION
281 # undef _GLIBCXX_EXTERN_TEMPLATE
282 # define _GLIBCXX_EXTERN_TEMPLATE -1
285 #ifdef _GLIBCXX_PARALLEL
286 # define _GLIBCXX_STD_A __cxx1998
287 # define _GLIBCXX_BEGIN_NAMESPACE_ALGO \
288 namespace _GLIBCXX_STD_A { _GLIBCXX_BEGIN_NAMESPACE_VERSION
289 # define _GLIBCXX_END_NAMESPACE_ALGO \
290 } _GLIBCXX_END_NAMESPACE_VERSION
293 #ifndef _GLIBCXX_STD_A
294 # define _GLIBCXX_STD_A std
297 #ifndef _GLIBCXX_STD_C
298 # define _GLIBCXX_STD_C std
301 #ifndef _GLIBCXX_BEGIN_NAMESPACE_ALGO
302 # define _GLIBCXX_BEGIN_NAMESPACE_ALGO
305 #ifndef _GLIBCXX_END_NAMESPACE_ALGO
306 # define _GLIBCXX_END_NAMESPACE_ALGO
309 #ifndef _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
310 # define _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
313 #ifndef _GLIBCXX_END_NAMESPACE_CONTAINER
314 # define _GLIBCXX_END_NAMESPACE_CONTAINER
317 // GLIBCXX_ABI Deprecated
318 // Define if compatibility should be provided for -mlong-double-64.
319 #undef _GLIBCXX_LONG_DOUBLE_COMPAT
321 // Inline namespace for long double 128 mode.
322 #if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined __LONG_DOUBLE_128__
325 inline namespace __gnu_cxx_ldbl128 { }
327 # define _GLIBCXX_NAMESPACE_LDBL __gnu_cxx_ldbl128::
328 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL namespace __gnu_cxx_ldbl128 {
329 # define _GLIBCXX_END_NAMESPACE_LDBL }
331 # define _GLIBCXX_NAMESPACE_LDBL
332 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL
333 # define _GLIBCXX_END_NAMESPACE_LDBL
337 #if !defined(_GLIBCXX_DEBUG) && !defined(_GLIBCXX_PARALLEL)
338 # define __glibcxx_assert(_Condition)
342 // Avoid the use of assert, because we're trying to keep the <cassert>
343 // include out of the mix.
345 __replacement_assert(const char* __file, int __line,
346 const char* __function, const char* __condition)
348 __builtin_printf("%s:%d: %s: Assertion '%s' failed.\n", __file, __line,
349 __function, __condition);
353 #define __glibcxx_assert(_Condition) \
356 if (! (_Condition)) \
357 std::__replacement_assert(__FILE__, __LINE__, __PRETTY_FUNCTION__, \
362 // Macros for race detectors.
363 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A) and
364 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A) should be used to explain
365 // atomic (lock-free) synchronization to race detectors:
366 // the race detector will infer a happens-before arc from the former to the
367 // latter when they share the same argument pointer.
369 // The most frequent use case for these macros (and the only case in the
370 // current implementation of the library) is atomic reference counting:
371 // void _M_remove_reference()
373 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&this->_M_refcount);
374 // if (__gnu_cxx::__exchange_and_add_dispatch(&this->_M_refcount, -1) <= 0)
376 // _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&this->_M_refcount);
380 // The annotations in this example tell the race detector that all memory
381 // accesses occurred when the refcount was positive do not race with
382 // memory accesses which occurred after the refcount became zero.
383 #ifndef _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE
384 # define _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(A)
386 #ifndef _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER
387 # define _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A)
390 // Macros for C linkage: define extern "C" linkage only when using C++.
391 # define _GLIBCXX_BEGIN_EXTERN_C extern "C" {
392 # define _GLIBCXX_END_EXTERN_C }
394 #else // !__cplusplus
395 # define _GLIBCXX_BEGIN_EXTERN_C
396 # define _GLIBCXX_END_EXTERN_C
402 // Pick up any OS-specific definitions.
403 #include <bits/os_defines.h>
405 // Pick up any CPU-specific definitions.
406 #include <bits/cpu_defines.h>
408 // If platform uses neither visibility nor psuedo-visibility,
409 // specify empty default for namespace annotation macros.
410 #ifndef _GLIBCXX_PSEUDO_VISIBILITY
411 # define _GLIBCXX_PSEUDO_VISIBILITY(V)
414 // Certain function definitions that are meant to be overridable from
415 // user code are decorated with this macro. For some targets, this
416 // macro causes these definitions to be weak.
417 #ifndef _GLIBCXX_WEAK_DEFINITION
418 # define _GLIBCXX_WEAK_DEFINITION
422 // The remainder of the prewritten config is automatic; all the
423 // user hooks are listed above.
425 // Create a boolean flag to be used to determine if --fast-math is set.
427 # define _GLIBCXX_FAST_MATH 1
429 # define _GLIBCXX_FAST_MATH 0
432 // This marks string literals in header files to be extracted for eventual
433 // translation. It is primarily used for messages in thrown exceptions; see
434 // src/functexcept.cc. We use __N because the more traditional _N is used
435 // for something else under certain OSes (see BADNAMES).
436 #define __N(msgid) (msgid)
438 // For example, <windows.h> is known to #define min and max as macros...
442 // End of prewritten config; the settings discovered at configure time follow.