libstdc++-v3/include/bits/c++config

   1 // Predefined symbols and macros -*- C++ -*-
   2
   3 // Copyright (C) 1997-2016 Free Software Foundation, Inc.
   4 //
   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)
   9 // any later version.
  10
  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.
  15
  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.
  19
  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/>.
  24
  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}
  28  */
  29
  30 #ifndef _GLIBCXX_CXX_CONFIG_H
  31 #define _GLIBCXX_CXX_CONFIG_H 1
  32
  33 // The current version of the C++ library in compressed ISO date format.
  34 #define __GLIBCXX__
  35
  36 // Macros for various attributes.
  37 //   _GLIBCXX_PURE
  38 //   _GLIBCXX_CONST
  39 //   _GLIBCXX_NORETURN
  40 //   _GLIBCXX_NOTHROW
  41 //   _GLIBCXX_VISIBILITY
  42 #ifndef _GLIBCXX_PURE
  43 # define _GLIBCXX_PURE __attribute__ ((__pure__))
  44 #endif
  45
  46 #ifndef _GLIBCXX_CONST
  47 # define _GLIBCXX_CONST __attribute__ ((__const__))
  48 #endif
  49
  50 #ifndef _GLIBCXX_NORETURN
  51 # define _GLIBCXX_NORETURN __attribute__ ((__noreturn__))
  52 #endif
  53
  54 // See below for C++
  55 #ifndef _GLIBCXX_NOTHROW
  56 # ifndef __cplusplus
  57 #  define _GLIBCXX_NOTHROW __attribute__((__nothrow__))
  58 # endif
  59 #endif
  60
  61 // Macros for visibility attributes.
  62 //   _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
  63 //   _GLIBCXX_VISIBILITY
  64 #define _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
  65
  66 #if _GLIBCXX_HAVE_ATTRIBUTE_VISIBILITY
  67 # define _GLIBCXX_VISIBILITY(V) __attribute__ ((__visibility__ (#V)))
  68 #else
  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)
  72 #endif
  73
  74 // Macros for deprecated attributes.
  75 //   _GLIBCXX_USE_DEPRECATED
  76 //   _GLIBCXX_DEPRECATED
  77 #ifndef _GLIBCXX_USE_DEPRECATED
  78 # define _GLIBCXX_USE_DEPRECATED 1
  79 #endif
  80
  81 #if defined(__DEPRECATED) && (__cplusplus >= 201103L)
  82 # define _GLIBCXX_DEPRECATED __attribute__ ((__deprecated__))
  83 #else
  84 # define _GLIBCXX_DEPRECATED
  85 #endif
  86
  87 // Macros for ABI tag attributes.
  88 #ifndef _GLIBCXX_ABI_TAG_CXX11
  89 # define _GLIBCXX_ABI_TAG_CXX11 __attribute ((__abi_tag__ ("cxx11")))
  90 #endif
  91
  92
  93 #if __cplusplus
  94
  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
 100 # else
 101 #  define _GLIBCXX_CONSTEXPR
 102 #  define _GLIBCXX_USE_CONSTEXPR const
 103 # endif
 104 #endif
 105
 106 #ifndef _GLIBCXX14_CONSTEXPR
 107 # if __cplusplus >= 201402L
 108 #  define _GLIBCXX14_CONSTEXPR constexpr
 109 # else
 110 #  define _GLIBCXX14_CONSTEXPR
 111 # endif
 112 #endif
 113
 114 #ifndef _GLIBCXX17_CONSTEXPR
 115 # if __cplusplus > 201402L
 116 #  define _GLIBCXX17_CONSTEXPR constexpr
 117 # else
 118 #  define _GLIBCXX17_CONSTEXPR
 119 # endif
 120 #endif
 121
 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)
 129 # else
 130 #  define _GLIBCXX_NOEXCEPT
 131 #  define _GLIBCXX_NOEXCEPT_IF(_COND)
 132 #  define _GLIBCXX_USE_NOEXCEPT throw()
 133 #  define _GLIBCXX_THROW(_EXC) throw(_EXC)
 134 # endif
 135 #endif
 136
 137 #ifndef _GLIBCXX_NOTHROW
 138 # define _GLIBCXX_NOTHROW _GLIBCXX_USE_NOEXCEPT
 139 #endif
 140
 141 #ifndef _GLIBCXX_THROW_OR_ABORT
 142 # if __cpp_exceptions
 143 #  define _GLIBCXX_THROW_OR_ABORT(_EXC) (throw (_EXC))
 144 # else
 145 #  define _GLIBCXX_THROW_OR_ABORT(_EXC) (__builtin_abort())
 146 # endif
 147 #endif
 148
 149 #if __cpp_noexcept_function_type
 150 #define _GLIBCXX_NOEXCEPT_PARM , bool _N
 151 #define _GLIBCXX_NOEXCEPT_QUAL noexcept (_N)
 152 #else
 153 #define _GLIBCXX_NOEXCEPT_PARM
 154 #define _GLIBCXX_NOEXCEPT_QUAL
 155 #endif
 156
 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
 168
 169 /*
 170   Outline of libstdc++ namespaces.
 171
 172   namespace std
 173   {
 174     namespace __debug { }
 175     namespace __parallel { }
 176     namespace __profile { }
 177     namespace __cxx1998 { }
 178
 179     namespace __detail { }
 180
 181     namespace rel_ops { }
 182
 183     namespace tr1
 184     {
 185       namespace placeholders { }
 186       namespace regex_constants { }
 187       namespace __detail { }
 188     }
 189
 190     namespace tr2 { }
 191
 192     namespace decimal { }
 193
 194     namespace chrono { }
 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 { }
 202     }
 203   }
 204
 205   namespace abi { }
 206
 207   namespace __gnu_cxx
 208   {
 209     namespace __detail { }
 210   }
 211
 212   For full details see:
 213   http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespaces.html
 214 */
 215 namespace std
 216 {
 217   typedef __SIZE_TYPE__         size_t;
 218   typedef __PTRDIFF_TYPE__      ptrdiff_t;
 219
 220 #if __cplusplus >= 201103L
 221   typedef decltype(nullptr)     nullptr_t;
 222 #endif
 223 }
 224
 225 #define _GLIBCXX_USE_DUAL_ABI
 226
 227 #if ! _GLIBCXX_USE_DUAL_ABI
 228 // Ignore any pre-defined value of _GLIBCXX_USE_CXX11_ABI
 229 # undef _GLIBCXX_USE_CXX11_ABI
 230 #endif
 231
 232 #ifndef _GLIBCXX_USE_CXX11_ABI
 233 #define _GLIBCXX_USE_CXX11_ABI
 234 #endif
 235
 236 #if _GLIBCXX_USE_CXX11_ABI
 237 namespace std
 238 {
 239   inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
 240 }
 241 namespace __gnu_cxx
 242 {
 243   inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
 244 }
 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
 249 #else
 250 # define _GLIBCXX_NAMESPACE_CXX11
 251 # define _GLIBCXX_BEGIN_NAMESPACE_CXX11
 252 # define _GLIBCXX_END_NAMESPACE_CXX11
 253 # define _GLIBCXX_DEFAULT_ABI_TAG
 254 #endif
 255
 256
 257 // Defined if inline namespaces are used for versioning.
 258 #define _GLIBCXX_INLINE_VERSION
 259
 260 // Inline namespace for symbol versioning.
 261 #if _GLIBCXX_INLINE_VERSION
 262
 263 namespace std
 264 {
 265   inline namespace __7 { }
 266
 267   namespace rel_ops { inline namespace __7 { } }
 268
 269   namespace tr1
 270   {
 271     inline namespace __7 { }
 272     namespace placeholders { inline namespace __7 { } }
 273     namespace regex_constants { inline namespace __7 { } }
 274     namespace __detail { inline namespace __7 { } }
 275   }
 276
 277   namespace tr2
 278   { inline namespace __7 { } }
 279
 280   namespace decimal { inline namespace __7 { } }
 281
 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 { } }
 286
 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 { } }
 291   }
 292
 293   namespace __detail {
 294     inline namespace __7 { }
 295     namespace __variant { inline namespace __7 { } }
 296   }
 297 }
 298
 299 namespace __gnu_cxx
 300 {
 301   inline namespace __7 { }
 302   namespace __detail { inline namespace __7 { } }
 303 }
 304 # define _GLIBCXX_BEGIN_NAMESPACE_VERSION namespace __7 {
 305 # define _GLIBCXX_END_NAMESPACE_VERSION }
 306 #else
 307 # define _GLIBCXX_BEGIN_NAMESPACE_VERSION
 308 # define _GLIBCXX_END_NAMESPACE_VERSION
 309 #endif
 310
 311
 312 // Inline namespaces for special modes: debug, parallel, profile.
 313 #if defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_PARALLEL) \
 314     || defined(_GLIBCXX_PROFILE)
 315 namespace std
 316 {
 317   // Non-inline namespace for components replaced by alternates in active mode.
 318   namespace __cxx1998
 319   {
 320 # if _GLIBCXX_INLINE_VERSION
 321   inline namespace __7 { }
 322 # endif
 323
 324 # if _GLIBCXX_USE_CXX11_ABI
 325   inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
 326 # endif
 327   }
 328
 329   // Inline namespace for debug mode.
 330 # ifdef _GLIBCXX_DEBUG
 331   inline namespace __debug { }
 332 # endif
 333
 334   // Inline namespaces for parallel mode.
 335 # ifdef _GLIBCXX_PARALLEL
 336   inline namespace __parallel { }
 337 # endif
 338
 339   // Inline namespaces for profile mode
 340 # ifdef _GLIBCXX_PROFILE
 341   inline namespace __profile { }
 342 # endif
 343 }
 344
 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
 348 # endif
 349 # if defined(_GLIBCXX_PROFILE) && defined(_GLIBCXX_DEBUG)
 350 #  error illegal use of multiple inlined namespaces
 351 # endif
 352 # if defined(_GLIBCXX_PROFILE) && defined(_GLIBCXX_PARALLEL)
 353 #  error illegal use of multiple inlined namespaces
 354 # endif
 355
 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
 360 # endif
 361 #endif
 362
 363 // Macros for namespace scope. Either namespace std:: or the name
 364 // of some nested namespace within it corresponding to the active mode.
 365 // _GLIBCXX_STD_A
 366 // _GLIBCXX_STD_C
 367 //
 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 }
 379 #else
 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
 383 #endif
 384
 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 }
 391 #else
 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
 395 #endif
 396
 397 // GLIBCXX_ABI Deprecated
 398 // Define if compatibility should be provided for -mlong-double-64.
 399 #undef _GLIBCXX_LONG_DOUBLE_COMPAT
 400
 401 // Inline namespace for long double 128 mode.
 402 #if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined __LONG_DOUBLE_128__
 403 namespace std
 404 {
 405   inline namespace __gnu_cxx_ldbl128 { }
 406 }
 407 # define _GLIBCXX_NAMESPACE_LDBL __gnu_cxx_ldbl128::
 408 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL namespace __gnu_cxx_ldbl128 {
 409 # define _GLIBCXX_END_NAMESPACE_LDBL }
 410 #else
 411 # define _GLIBCXX_NAMESPACE_LDBL
 412 # define _GLIBCXX_BEGIN_NAMESPACE_LDBL
 413 # define _GLIBCXX_END_NAMESPACE_LDBL
 414 #endif
 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
 419 #else
 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
 423 #endif
 424
 425 // Debug Mode implies checking assertions.
 426 #ifdef _GLIBCXX_DEBUG
 427 # define _GLIBCXX_ASSERTIONS 1
 428 #endif
 429
 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
 434 #endif
 435
 436 // Assert.
 437 #if !defined(_GLIBCXX_ASSERTIONS) && !defined(_GLIBCXX_PARALLEL)
 438 # define __glibcxx_assert(_Condition)
 439 #else
 440 namespace std
 441 {
 442   // Avoid the use of assert, because we're trying to keep the <cassert>
 443   // include out of the mix.
 444   inline void
 445   __replacement_assert(const char* __file, int __line,
 446                        const char* __function, const char* __condition)
 447   {
 448     __builtin_printf("%s:%d: %s: Assertion '%s' failed.\n", __file, __line,
 449                      __function, __condition);
 450     __builtin_abort();
 451   }
 452 }
 453 #define __glibcxx_assert(_Condition)                                     \
 454   do                                                                     \
 455   {                                                                      \
 456     if (! (_Condition))                                                  \
 457       std::__replacement_assert(__FILE__, __LINE__, __PRETTY_FUNCTION__, \
 458                                 #_Condition);                            \
 459   } while (false)
 460 #endif
 461
 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.
 468 //
 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()
 472 //   {
 473 //     _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&this->_M_refcount);
 474 //     if (__gnu_cxx::__exchange_and_add_dispatch(&this->_M_refcount, -1) <= 0)
 475 //       {
 476 //         _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&this->_M_refcount);
 477 //         _M_destroy(__a);
 478 //       }
 479 //   }
 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)
 485 #endif
 486 #ifndef _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER
 487 # define  _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(A)
 488 #endif
 489
 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 }
 493
 494 #define _GLIBCXX_USE_ALLOCATOR_NEW
 495
 496 #else // !__cplusplus
 497 # define _GLIBCXX_BEGIN_EXTERN_C
 498 # define _GLIBCXX_END_EXTERN_C
 499 #endif
 500
 501
 502 // First includes.
 503
 504 // Pick up any OS-specific definitions.
 505 #include <bits/os_defines.h>
 506
 507 // Pick up any CPU-specific definitions.
 508 #include <bits/cpu_defines.h>
 509
 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)
 514 #endif
 515
 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
 521 #endif
 522
 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__
 529 #endif
 530
 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
 533 // implementation.
 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
 540 #else
 541 #define _GLIBCXX_TXN_SAFE
 542 #define _GLIBCXX_TXN_SAFE_DYN
 543 #endif
 544
 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
 551 #endif
 552
 553 // The remainder of the prewritten config is automatic; all the
 554 // user hooks are listed above.
 555
 556 // Create a boolean flag to be used to determine if --fast-math is set.
 557 #ifdef __FAST_MATH__
 558 # define _GLIBCXX_FAST_MATH 1
 559 #else
 560 # define _GLIBCXX_FAST_MATH 0
 561 #endif
 562
 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)
 568
 569 // For example, <windows.h> is known to #define min and max as macros...
 570 #undef min
 571 #undef max
 572
 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
 578 # endif
 579 # ifndef _GLIBCXX_USE_C99_COMPLEX
 580 # define _GLIBCXX_USE_C99_COMPLEX _GLIBCXX11_USE_C99_COMPLEX
 581 # endif
 582 # ifndef _GLIBCXX_USE_C99_STDIO
 583 # define _GLIBCXX_USE_C99_STDIO _GLIBCXX11_USE_C99_STDIO
 584 # endif
 585 # ifndef _GLIBCXX_USE_C99_STDLIB
 586 # define _GLIBCXX_USE_C99_STDLIB _GLIBCXX11_USE_C99_STDLIB
 587 # endif
 588 # ifndef _GLIBCXX_USE_C99_WCHAR
 589 # define _GLIBCXX_USE_C99_WCHAR _GLIBCXX11_USE_C99_WCHAR
 590 # endif
 591 #else
 592 # ifndef _GLIBCXX_USE_C99_MATH
 593 #  define _GLIBCXX_USE_C99_MATH _GLIBCXX98_USE_C99_MATH
 594 # endif
 595 # ifndef _GLIBCXX_USE_C99_COMPLEX
 596 # define _GLIBCXX_USE_C99_COMPLEX _GLIBCXX98_USE_C99_COMPLEX
 597 # endif
 598 # ifndef _GLIBCXX_USE_C99_STDIO
 599 # define _GLIBCXX_USE_C99_STDIO _GLIBCXX98_USE_C99_STDIO
 600 # endif
 601 # ifndef _GLIBCXX_USE_C99_STDLIB
 602 # define _GLIBCXX_USE_C99_STDLIB _GLIBCXX98_USE_C99_STDLIB
 603 # endif
 604 # ifndef _GLIBCXX_USE_C99_WCHAR
 605 # define _GLIBCXX_USE_C99_WCHAR _GLIBCXX98_USE_C99_WCHAR
 606 # endif
 607 #endif
 608
 609 // End of prewritten config; the settings discovered at configure time follow.