1// -*- C++ -*- 2//===--------------------------- __config ---------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_CONFIG 11#define _LIBCPP_CONFIG 12 13#if defined(_MSC_VER) && !defined(__clang__) 14# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 15# define _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER 16# endif 17#endif 18 19#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER 20#pragma GCC system_header 21#endif 22 23#ifdef __cplusplus 24 25#ifdef __GNUC__ 26# define _GNUC_VER (__GNUC__ * 100 + __GNUC_MINOR__) 27// The _GNUC_VER_NEW macro better represents the new GCC versioning scheme 28// introduced in GCC 5.0. 29# define _GNUC_VER_NEW (_GNUC_VER * 10 + __GNUC_PATCHLEVEL__) 30#else 31# define _GNUC_VER 0 32# define _GNUC_VER_NEW 0 33#endif 34 35#define _LIBCPP_VERSION 10000 36 37#ifndef _LIBCPP_ABI_VERSION 38# define _LIBCPP_ABI_VERSION 1 39#endif 40 41#ifndef __STDC_HOSTED__ 42# define _LIBCPP_FREESTANDING 43#endif 44 45#ifndef _LIBCPP_STD_VER 46# if __cplusplus <= 201103L 47# define _LIBCPP_STD_VER 11 48# elif __cplusplus <= 201402L 49# define _LIBCPP_STD_VER 14 50# elif __cplusplus <= 201703L 51# define _LIBCPP_STD_VER 17 52# else 53# define _LIBCPP_STD_VER 18 // current year, or date of c++2a ratification 54# endif 55#endif // _LIBCPP_STD_VER 56 57#if defined(__ELF__) 58# define _LIBCPP_OBJECT_FORMAT_ELF 1 59#elif defined(__MACH__) 60# define _LIBCPP_OBJECT_FORMAT_MACHO 1 61#elif defined(_WIN32) 62# define _LIBCPP_OBJECT_FORMAT_COFF 1 63#elif defined(__wasm__) 64# define _LIBCPP_OBJECT_FORMAT_WASM 1 65#else 66# error Unknown object file format 67#endif 68 69#if defined(_LIBCPP_ABI_UNSTABLE) || _LIBCPP_ABI_VERSION >= 2 70// Change short string representation so that string data starts at offset 0, 71// improving its alignment in some cases. 72# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT 73// Fix deque iterator type in order to support incomplete types. 74# define _LIBCPP_ABI_INCOMPLETE_TYPES_IN_DEQUE 75// Fix undefined behavior in how std::list stores its linked nodes. 76# define _LIBCPP_ABI_LIST_REMOVE_NODE_POINTER_UB 77// Fix undefined behavior in how __tree stores its end and parent nodes. 78# define _LIBCPP_ABI_TREE_REMOVE_NODE_POINTER_UB 79// Fix undefined behavior in how __hash_table stores its pointer types. 80# define _LIBCPP_ABI_FIX_UNORDERED_NODE_POINTER_UB 81# define _LIBCPP_ABI_FORWARD_LIST_REMOVE_NODE_POINTER_UB 82# define _LIBCPP_ABI_FIX_UNORDERED_CONTAINER_SIZE_TYPE 83// Don't use a nullptr_t simulation type in C++03 instead using C++11 nullptr 84// provided under the alternate keyword __nullptr, which changes the mangling 85// of nullptr_t. This option is ABI incompatible with GCC in C++03 mode. 86# define _LIBCPP_ABI_ALWAYS_USE_CXX11_NULLPTR 87// Define the `pointer_safety` enum as a C++11 strongly typed enumeration 88// instead of as a class simulating an enum. If this option is enabled 89// `pointer_safety` and `get_pointer_safety()` will no longer be available 90// in C++03. 91# define _LIBCPP_ABI_POINTER_SAFETY_ENUM_TYPE 92// Define a key function for `bad_function_call` in the library, to centralize 93// its vtable and typeinfo to libc++ rather than having all other libraries 94// using that class define their own copies. 95# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION 96// Enable optimized version of __do_get_(un)signed which avoids redundant copies. 97# define _LIBCPP_ABI_OPTIMIZED_LOCALE_NUM_GET 98// Use the smallest possible integer type to represent the index of the variant. 99// Previously libc++ used "unsigned int" exclusively. 100# define _LIBCPP_ABI_VARIANT_INDEX_TYPE_OPTIMIZATION 101// Unstable attempt to provide a more optimized std::function 102# define _LIBCPP_ABI_OPTIMIZED_FUNCTION 103// All the regex constants must be distinct and nonzero. 104# define _LIBCPP_ABI_REGEX_CONSTANTS_NONZERO 105#elif _LIBCPP_ABI_VERSION == 1 106# if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 107// Enable compiling copies of now inline methods into the dylib to support 108// applications compiled against older libraries. This is unnecessary with 109// COFF dllexport semantics, since dllexport forces a non-inline definition 110// of inline functions to be emitted anyway. Our own non-inline copy would 111// conflict with the dllexport-emitted copy, so we disable it. 112# define _LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS 113# endif 114// Feature macros for disabling pre ABI v1 features. All of these options 115// are deprecated. 116# if defined(__FreeBSD__) 117# define _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR 118# endif 119#endif 120 121#ifdef _LIBCPP_TRIVIAL_PAIR_COPY_CTOR 122#error "_LIBCPP_TRIVIAL_PAIR_COPY_CTOR" is no longer supported. \ 123 use _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR instead 124#endif 125 126#define _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_X##_LIBCPP_Y 127#define _LIBCPP_CONCAT(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y) 128 129#ifndef _LIBCPP_ABI_NAMESPACE 130# define _LIBCPP_ABI_NAMESPACE _LIBCPP_CONCAT(__,_LIBCPP_ABI_VERSION) 131#endif 132 133#if __cplusplus < 201103L 134#define _LIBCPP_CXX03_LANG 135#endif 136 137#ifndef __has_attribute 138#define __has_attribute(__x) 0 139#endif 140 141#ifndef __has_builtin 142#define __has_builtin(__x) 0 143#endif 144 145#ifndef __has_extension 146#define __has_extension(__x) 0 147#endif 148 149#ifndef __has_feature 150#define __has_feature(__x) 0 151#endif 152 153#ifndef __has_cpp_attribute 154#define __has_cpp_attribute(__x) 0 155#endif 156 157// '__is_identifier' returns '0' if '__x' is a reserved identifier provided by 158// the compiler and '1' otherwise. 159#ifndef __is_identifier 160#define __is_identifier(__x) 1 161#endif 162 163#ifndef __has_declspec_attribute 164#define __has_declspec_attribute(__x) 0 165#endif 166 167#define __has_keyword(__x) !(__is_identifier(__x)) 168 169#ifndef __has_include 170#define __has_include(...) 0 171#endif 172 173#if defined(__clang__) 174# define _LIBCPP_COMPILER_CLANG 175# ifndef __apple_build_version__ 176# define _LIBCPP_CLANG_VER (__clang_major__ * 100 + __clang_minor__) 177# endif 178#elif defined(__GNUC__) 179# define _LIBCPP_COMPILER_GCC 180#elif defined(_MSC_VER) 181# define _LIBCPP_COMPILER_MSVC 182#elif defined(__IBMCPP__) 183# define _LIBCPP_COMPILER_IBM 184#endif 185 186#if defined(_LIBCPP_COMPILER_GCC) && __cplusplus < 201103L 187#error "libc++ does not support using GCC with C++03. Please enable C++11" 188#endif 189 190// FIXME: ABI detection should be done via compiler builtin macros. This 191// is just a placeholder until Clang implements such macros. For now assume 192// that Windows compilers pretending to be MSVC++ target the Microsoft ABI, 193// and allow the user to explicitly specify the ABI to handle cases where this 194// heuristic falls short. 195#if defined(_LIBCPP_ABI_FORCE_ITANIUM) && defined(_LIBCPP_ABI_FORCE_MICROSOFT) 196# error "Only one of _LIBCPP_ABI_FORCE_ITANIUM and _LIBCPP_ABI_FORCE_MICROSOFT can be defined" 197#elif defined(_LIBCPP_ABI_FORCE_ITANIUM) 198# define _LIBCPP_ABI_ITANIUM 199#elif defined(_LIBCPP_ABI_FORCE_MICROSOFT) 200# define _LIBCPP_ABI_MICROSOFT 201#else 202# if defined(_WIN32) && defined(_MSC_VER) 203# define _LIBCPP_ABI_MICROSOFT 204# else 205# define _LIBCPP_ABI_ITANIUM 206# endif 207#endif 208 209#if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME) 210# define _LIBCPP_ABI_VCRUNTIME 211#endif 212 213// Need to detect which libc we're using if we're on Linux. 214#if defined(__linux__) 215# include <features.h> 216# if defined(__GLIBC_PREREQ) 217# define _LIBCPP_GLIBC_PREREQ(a, b) __GLIBC_PREREQ(a, b) 218# else 219# define _LIBCPP_GLIBC_PREREQ(a, b) 0 220# endif // defined(__GLIBC_PREREQ) 221#endif // defined(__linux__) 222 223#ifdef __LITTLE_ENDIAN__ 224# if __LITTLE_ENDIAN__ 225# define _LIBCPP_LITTLE_ENDIAN 226# endif // __LITTLE_ENDIAN__ 227#endif // __LITTLE_ENDIAN__ 228 229#ifdef __BIG_ENDIAN__ 230# if __BIG_ENDIAN__ 231# define _LIBCPP_BIG_ENDIAN 232# endif // __BIG_ENDIAN__ 233#endif // __BIG_ENDIAN__ 234 235#ifdef __BYTE_ORDER__ 236# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 237# define _LIBCPP_LITTLE_ENDIAN 238# elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 239# define _LIBCPP_BIG_ENDIAN 240# endif // __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 241#endif // __BYTE_ORDER__ 242 243#ifdef __FreeBSD__ 244# include <sys/endian.h> 245# if _BYTE_ORDER == _LITTLE_ENDIAN 246# define _LIBCPP_LITTLE_ENDIAN 247# else // _BYTE_ORDER == _LITTLE_ENDIAN 248# define _LIBCPP_BIG_ENDIAN 249# endif // _BYTE_ORDER == _LITTLE_ENDIAN 250# ifndef __LONG_LONG_SUPPORTED 251# define _LIBCPP_HAS_NO_LONG_LONG 252# endif // __LONG_LONG_SUPPORTED 253#endif // __FreeBSD__ 254 255#ifdef __NetBSD__ 256# include <sys/endian.h> 257# if _BYTE_ORDER == _LITTLE_ENDIAN 258# define _LIBCPP_LITTLE_ENDIAN 259# else // _BYTE_ORDER == _LITTLE_ENDIAN 260# define _LIBCPP_BIG_ENDIAN 261# endif // _BYTE_ORDER == _LITTLE_ENDIAN 262# define _LIBCPP_HAS_QUICK_EXIT 263#endif // __NetBSD__ 264 265#if defined(_WIN32) 266# define _LIBCPP_WIN32API 267# define _LIBCPP_LITTLE_ENDIAN 268# define _LIBCPP_SHORT_WCHAR 1 269// Both MinGW and native MSVC provide a "MSVC"-like environment 270# define _LIBCPP_MSVCRT_LIKE 271// If mingw not explicitly detected, assume using MS C runtime only if 272// a MS compatibility version is specified. 273# if defined(_MSC_VER) && !defined(__MINGW32__) 274# define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library 275# endif 276# if (defined(_M_AMD64) || defined(__x86_64__)) || (defined(_M_ARM) || defined(__arm__)) 277# define _LIBCPP_HAS_BITSCAN64 278# endif 279# define _LIBCPP_HAS_OPEN_WITH_WCHAR 280# if defined(_LIBCPP_MSVCRT) 281# define _LIBCPP_HAS_QUICK_EXIT 282# endif 283 284// Some CRT APIs are unavailable to store apps 285# if defined(WINAPI_FAMILY) 286# include <winapifamily.h> 287# if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) && \ 288 (!defined(WINAPI_PARTITION_SYSTEM) || \ 289 !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_SYSTEM)) 290# define _LIBCPP_WINDOWS_STORE_APP 291# endif 292# endif 293#endif // defined(_WIN32) 294 295#ifdef __sun__ 296# include <sys/isa_defs.h> 297# ifdef _LITTLE_ENDIAN 298# define _LIBCPP_LITTLE_ENDIAN 299# else 300# define _LIBCPP_BIG_ENDIAN 301# endif 302#endif // __sun__ 303 304#if defined(__CloudABI__) 305 // Certain architectures provide arc4random(). Prefer using 306 // arc4random() over /dev/{u,}random to make it possible to obtain 307 // random data even when using sandboxing mechanisms such as chroots, 308 // Capsicum, etc. 309# define _LIBCPP_USING_ARC4_RANDOM 310#elif defined(__Fuchsia__) || defined(__wasi__) 311# define _LIBCPP_USING_GETENTROPY 312#elif defined(__native_client__) 313 // NaCl's sandbox (which PNaCl also runs in) doesn't allow filesystem access, 314 // including accesses to the special files under /dev. C++11's 315 // std::random_device is instead exposed through a NaCl syscall. 316# define _LIBCPP_USING_NACL_RANDOM 317#elif defined(_LIBCPP_WIN32API) 318# define _LIBCPP_USING_WIN32_RANDOM 319#else 320# define _LIBCPP_USING_DEV_RANDOM 321#endif 322 323#if !defined(_LIBCPP_LITTLE_ENDIAN) && !defined(_LIBCPP_BIG_ENDIAN) 324# include <endian.h> 325# if __BYTE_ORDER == __LITTLE_ENDIAN 326# define _LIBCPP_LITTLE_ENDIAN 327# elif __BYTE_ORDER == __BIG_ENDIAN 328# define _LIBCPP_BIG_ENDIAN 329# else // __BYTE_ORDER == __BIG_ENDIAN 330# error unable to determine endian 331# endif 332#endif // !defined(_LIBCPP_LITTLE_ENDIAN) && !defined(_LIBCPP_BIG_ENDIAN) 333 334#if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC) 335# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi"))) 336#else 337# define _LIBCPP_NO_CFI 338#endif 339 340#if __ISO_C_VISIBLE >= 2011 || __cplusplus >= 201103L 341# if defined(__FreeBSD__) 342# define _LIBCPP_HAS_QUICK_EXIT 343# define _LIBCPP_HAS_C11_FEATURES 344# elif defined(__Fuchsia__) || defined(__wasi__) 345# define _LIBCPP_HAS_QUICK_EXIT 346# define _LIBCPP_HAS_TIMESPEC_GET 347# define _LIBCPP_HAS_C11_FEATURES 348# elif defined(__linux__) 349# if !defined(_LIBCPP_HAS_MUSL_LIBC) 350# if _LIBCPP_GLIBC_PREREQ(2, 15) || defined(__BIONIC__) 351# define _LIBCPP_HAS_QUICK_EXIT 352# endif 353# if _LIBCPP_GLIBC_PREREQ(2, 17) 354# define _LIBCPP_HAS_C11_FEATURES 355# define _LIBCPP_HAS_TIMESPEC_GET 356# endif 357# else // defined(_LIBCPP_HAS_MUSL_LIBC) 358# define _LIBCPP_HAS_QUICK_EXIT 359# define _LIBCPP_HAS_TIMESPEC_GET 360# define _LIBCPP_HAS_C11_FEATURES 361# endif 362# endif // __linux__ 363#endif 364 365#ifndef _LIBCPP_CXX03_LANG 366# define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp) 367#elif defined(_LIBCPP_COMPILER_CLANG) 368# define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp) 369#else 370// This definition is potentially buggy, but it's only taken with GCC in C++03, 371// which we barely support anyway. See llvm.org/PR39713 372# define _LIBCPP_ALIGNOF(_Tp) __alignof(_Tp) 373#endif 374 375#define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp) 376 377#if defined(_LIBCPP_COMPILER_CLANG) 378 379// _LIBCPP_ALTERNATE_STRING_LAYOUT is an old name for 380// _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT left here for backward compatibility. 381#if (defined(__APPLE__) && !defined(__i386__) && !defined(__x86_64__) && \ 382 (!defined(__arm__) || __ARM_ARCH_7K__ >= 2)) || \ 383 defined(_LIBCPP_ALTERNATE_STRING_LAYOUT) 384#define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT 385#endif 386 387#if __has_feature(cxx_alignas) 388# define _ALIGNAS_TYPE(x) alignas(x) 389# define _ALIGNAS(x) alignas(x) 390#else 391# define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x)))) 392# define _ALIGNAS(x) __attribute__((__aligned__(x))) 393#endif 394 395#if __cplusplus < 201103L 396typedef __char16_t char16_t; 397typedef __char32_t char32_t; 398#endif 399 400#if !(__has_feature(cxx_exceptions)) && !defined(_LIBCPP_NO_EXCEPTIONS) 401#define _LIBCPP_NO_EXCEPTIONS 402#endif 403 404#if !(__has_feature(cxx_rtti)) && !defined(_LIBCPP_NO_RTTI) 405#define _LIBCPP_NO_RTTI 406#endif 407 408#if !(__has_feature(cxx_strong_enums)) 409#define _LIBCPP_HAS_NO_STRONG_ENUMS 410#endif 411 412#if __has_feature(cxx_attributes) 413# define _LIBCPP_NORETURN [[noreturn]] 414#else 415# define _LIBCPP_NORETURN __attribute__ ((noreturn)) 416#endif 417 418#if !(__has_feature(cxx_lambdas)) 419#define _LIBCPP_HAS_NO_LAMBDAS 420#endif 421 422#if !(__has_feature(cxx_nullptr)) 423# if (__has_extension(cxx_nullptr) || __has_keyword(__nullptr)) && defined(_LIBCPP_ABI_ALWAYS_USE_CXX11_NULLPTR) 424# define nullptr __nullptr 425# else 426# define _LIBCPP_HAS_NO_NULLPTR 427# endif 428#endif 429 430#if !(__has_feature(cxx_rvalue_references)) 431#define _LIBCPP_HAS_NO_RVALUE_REFERENCES 432#endif 433 434#if !(__has_feature(cxx_auto_type)) 435#define _LIBCPP_HAS_NO_AUTO_TYPE 436#endif 437 438#if !(__has_feature(cxx_variadic_templates)) 439#define _LIBCPP_HAS_NO_VARIADICS 440#endif 441 442// Objective-C++ features (opt-in) 443#if __has_feature(objc_arc) 444#define _LIBCPP_HAS_OBJC_ARC 445#endif 446 447#if __has_feature(objc_arc_weak) 448#define _LIBCPP_HAS_OBJC_ARC_WEAK 449#endif 450 451#if !(__has_feature(cxx_relaxed_constexpr)) 452#define _LIBCPP_HAS_NO_CXX14_CONSTEXPR 453#endif 454 455#if !(__has_feature(cxx_variable_templates)) 456#define _LIBCPP_HAS_NO_VARIABLE_TEMPLATES 457#endif 458 459#if !(__has_feature(cxx_noexcept)) 460#define _LIBCPP_HAS_NO_NOEXCEPT 461#endif 462 463#if !defined(_LIBCPP_HAS_NO_ASAN) && !__has_feature(address_sanitizer) 464#define _LIBCPP_HAS_NO_ASAN 465#endif 466 467// Allow for build-time disabling of unsigned integer sanitization 468#if !defined(_LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK) && __has_attribute(no_sanitize) 469#define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow"))) 470#endif 471 472#if __has_builtin(__builtin_launder) 473#define _LIBCPP_COMPILER_HAS_BUILTIN_LAUNDER 474#endif 475 476#if !__is_identifier(__has_unique_object_representations) 477#define _LIBCPP_HAS_UNIQUE_OBJECT_REPRESENTATIONS 478#endif 479 480#define _LIBCPP_ALWAYS_INLINE __attribute__ ((__always_inline__)) 481 482// Literal operators ""d and ""y are supported starting with LLVM Clang 8 and AppleClang 10.0.1 483#if (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 800) || \ 484 (defined(__apple_build_version__) && __apple_build_version__ < 10010000) 485#define _LIBCPP_HAS_NO_CXX20_CHRONO_LITERALS 486#endif 487 488#define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__ 489 490#elif defined(_LIBCPP_COMPILER_GCC) 491 492#define _ALIGNAS(x) __attribute__((__aligned__(x))) 493#define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x)))) 494 495#define _LIBCPP_NORETURN __attribute__((noreturn)) 496 497#if !__EXCEPTIONS && !defined(_LIBCPP_NO_EXCEPTIONS) 498#define _LIBCPP_NO_EXCEPTIONS 499#endif 500 501// Determine if GCC supports relaxed constexpr 502#if !defined(__cpp_constexpr) || __cpp_constexpr < 201304L 503#define _LIBCPP_HAS_NO_CXX14_CONSTEXPR 504#endif 505 506// GCC 5 supports variable templates 507#if !defined(__cpp_variable_templates) || __cpp_variable_templates < 201304L 508#define _LIBCPP_HAS_NO_VARIABLE_TEMPLATES 509#endif 510 511#if !defined(_LIBCPP_HAS_NO_ASAN) && !defined(__SANITIZE_ADDRESS__) 512#define _LIBCPP_HAS_NO_ASAN 513#endif 514 515#if _GNUC_VER >= 700 516#define _LIBCPP_COMPILER_HAS_BUILTIN_LAUNDER 517#endif 518 519#if _GNUC_VER >= 700 520#define _LIBCPP_HAS_UNIQUE_OBJECT_REPRESENTATIONS 521#endif 522 523#define _LIBCPP_ALWAYS_INLINE __attribute__ ((__always_inline__)) 524 525#define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__ 526 527#elif defined(_LIBCPP_COMPILER_MSVC) 528 529#define _LIBCPP_TOSTRING2(x) #x 530#define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x) 531#define _LIBCPP_WARNING(x) __pragma(message(__FILE__ "(" _LIBCPP_TOSTRING(__LINE__) ") : warning note: " x)) 532 533#if _MSC_VER < 1900 534#error "MSVC versions prior to Visual Studio 2015 are not supported" 535#endif 536 537#define _LIBCPP_HAS_NO_CXX14_CONSTEXPR 538#define _LIBCPP_HAS_NO_VARIABLE_TEMPLATES 539#define __alignof__ __alignof 540#define _LIBCPP_NORETURN __declspec(noreturn) 541#define _ALIGNAS(x) __declspec(align(x)) 542#define _ALIGNAS_TYPE(x) alignas(x) 543 544#define _LIBCPP_WEAK 545 546#define _LIBCPP_HAS_NO_ASAN 547 548#define _LIBCPP_ALWAYS_INLINE __forceinline 549 550#define _LIBCPP_HAS_NO_VECTOR_EXTENSION 551 552#define _LIBCPP_DISABLE_EXTENSION_WARNING 553 554#elif defined(_LIBCPP_COMPILER_IBM) 555 556#define _ALIGNAS(x) __attribute__((__aligned__(x))) 557#define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x)))) 558#define _ATTRIBUTE(x) __attribute__((x)) 559#define _LIBCPP_NORETURN __attribute__((noreturn)) 560 561#define _LIBCPP_HAS_NO_UNICODE_CHARS 562#define _LIBCPP_HAS_NO_VARIABLE_TEMPLATES 563 564#if defined(_AIX) 565#define __MULTILOCALE_API 566#endif 567 568#define _LIBCPP_HAS_NO_ASAN 569 570#define _LIBCPP_ALWAYS_INLINE __attribute__ ((__always_inline__)) 571 572#define _LIBCPP_HAS_NO_VECTOR_EXTENSION 573 574#define _LIBCPP_DISABLE_EXTENSION_WARNING 575 576#endif // _LIBCPP_COMPILER_[CLANG|GCC|MSVC|IBM] 577 578#if defined(_LIBCPP_OBJECT_FORMAT_COFF) 579 580#ifdef _DLL 581# define _LIBCPP_CRT_FUNC __declspec(dllimport) 582#else 583# define _LIBCPP_CRT_FUNC 584#endif 585 586#if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 587# define _LIBCPP_DLL_VIS 588# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 589# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 590# define _LIBCPP_OVERRIDABLE_FUNC_VIS 591# define _LIBCPP_EXPORTED_FROM_ABI 592#elif defined(_LIBCPP_BUILDING_LIBRARY) 593# define _LIBCPP_DLL_VIS __declspec(dllexport) 594# if defined(__MINGW32__) 595# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS 596# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 597# else 598# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 599# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS 600# endif 601# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_DLL_VIS 602# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllexport) 603#else 604# define _LIBCPP_DLL_VIS __declspec(dllimport) 605# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS 606# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 607# define _LIBCPP_OVERRIDABLE_FUNC_VIS 608# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllimport) 609#endif 610 611#define _LIBCPP_TYPE_VIS _LIBCPP_DLL_VIS 612#define _LIBCPP_FUNC_VIS _LIBCPP_DLL_VIS 613#define _LIBCPP_EXCEPTION_ABI _LIBCPP_DLL_VIS 614#define _LIBCPP_HIDDEN 615#define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 616#define _LIBCPP_TEMPLATE_VIS 617#define _LIBCPP_ENUM_VIS 618 619#endif // defined(_LIBCPP_OBJECT_FORMAT_COFF) 620 621#ifndef _LIBCPP_HIDDEN 622# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 623# define _LIBCPP_HIDDEN __attribute__ ((__visibility__("hidden"))) 624# else 625# define _LIBCPP_HIDDEN 626# endif 627#endif 628 629#ifndef _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 630# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 631// The inline should be removed once PR32114 is resolved 632# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS inline _LIBCPP_HIDDEN 633# else 634# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 635# endif 636#endif 637 638#ifndef _LIBCPP_FUNC_VIS 639# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 640# define _LIBCPP_FUNC_VIS __attribute__ ((__visibility__("default"))) 641# else 642# define _LIBCPP_FUNC_VIS 643# endif 644#endif 645 646#ifndef _LIBCPP_TYPE_VIS 647# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 648# define _LIBCPP_TYPE_VIS __attribute__ ((__visibility__("default"))) 649# else 650# define _LIBCPP_TYPE_VIS 651# endif 652#endif 653 654#ifndef _LIBCPP_TEMPLATE_VIS 655# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 656# if __has_attribute(__type_visibility__) 657# define _LIBCPP_TEMPLATE_VIS __attribute__ ((__type_visibility__("default"))) 658# else 659# define _LIBCPP_TEMPLATE_VIS __attribute__ ((__visibility__("default"))) 660# endif 661# else 662# define _LIBCPP_TEMPLATE_VIS 663# endif 664#endif 665 666#ifndef _LIBCPP_EXPORTED_FROM_ABI 667# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 668# define _LIBCPP_EXPORTED_FROM_ABI __attribute__((__visibility__("default"))) 669# else 670# define _LIBCPP_EXPORTED_FROM_ABI 671# endif 672#endif 673 674#ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS 675#define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_FUNC_VIS 676#endif 677 678#ifndef _LIBCPP_EXCEPTION_ABI 679# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 680# define _LIBCPP_EXCEPTION_ABI __attribute__ ((__visibility__("default"))) 681# else 682# define _LIBCPP_EXCEPTION_ABI 683# endif 684#endif 685 686#ifndef _LIBCPP_ENUM_VIS 687# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__) 688# define _LIBCPP_ENUM_VIS __attribute__ ((__type_visibility__("default"))) 689# else 690# define _LIBCPP_ENUM_VIS 691# endif 692#endif 693 694#ifndef _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 695# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__) 696# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS __attribute__ ((__visibility__("default"))) 697# else 698# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 699# endif 700#endif 701 702#ifndef _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 703#define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 704#endif 705 706#if __has_attribute(internal_linkage) 707# define _LIBCPP_INTERNAL_LINKAGE __attribute__ ((internal_linkage)) 708#else 709# define _LIBCPP_INTERNAL_LINKAGE _LIBCPP_ALWAYS_INLINE 710#endif 711 712#if __has_attribute(exclude_from_explicit_instantiation) 713# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__ ((__exclude_from_explicit_instantiation__)) 714#else 715 // Try to approximate the effect of exclude_from_explicit_instantiation 716 // (which is that entities are not assumed to be provided by explicit 717 // template instantiations in the dylib) by always inlining those entities. 718# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION _LIBCPP_ALWAYS_INLINE 719#endif 720 721#ifndef _LIBCPP_HIDE_FROM_ABI_PER_TU 722# ifndef _LIBCPP_HIDE_FROM_ABI_PER_TU_BY_DEFAULT 723# define _LIBCPP_HIDE_FROM_ABI_PER_TU 0 724# else 725# define _LIBCPP_HIDE_FROM_ABI_PER_TU 1 726# endif 727#endif 728 729#ifndef _LIBCPP_HAS_MERGED_TYPEINFO_NAMES_DEFAULT 730# ifdef _LIBCPP_OBJECT_FORMAT_COFF // Windows binaries can't merge typeinfos. 731# define _LIBCPP_HAS_MERGED_TYPEINFO_NAMES_DEFAULT 0 732#else 733// TODO: This isn't strictly correct on ELF platforms due to llvm.org/PR37398 734// And we should consider defaulting to OFF. 735# define _LIBCPP_HAS_MERGED_TYPEINFO_NAMES_DEFAULT 1 736#endif 737#endif 738 739#ifndef _LIBCPP_HIDE_FROM_ABI 740# if _LIBCPP_HIDE_FROM_ABI_PER_TU 741# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_INTERNAL_LINKAGE 742# else 743# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 744# endif 745#endif 746 747#ifdef _LIBCPP_BUILDING_LIBRARY 748# if _LIBCPP_ABI_VERSION > 1 749# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 750# else 751# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 752# endif 753#else 754# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 755#endif 756 757// Just so we can migrate to the new macros gradually. 758#define _LIBCPP_INLINE_VISIBILITY _LIBCPP_HIDE_FROM_ABI 759 760// Inline namespaces are available in Clang/GCC/MSVC regardless of C++ dialect. 761#define _LIBCPP_BEGIN_NAMESPACE_STD namespace std { inline namespace _LIBCPP_ABI_NAMESPACE { 762#define _LIBCPP_END_NAMESPACE_STD } } 763#define _VSTD std::_LIBCPP_ABI_NAMESPACE 764_LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_END_NAMESPACE_STD 765 766#if _LIBCPP_STD_VER >= 17 767#define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM \ 768 _LIBCPP_BEGIN_NAMESPACE_STD inline namespace __fs { namespace filesystem { 769#else 770#define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM \ 771 _LIBCPP_BEGIN_NAMESPACE_STD namespace __fs { namespace filesystem { 772#endif 773 774#define _LIBCPP_END_NAMESPACE_FILESYSTEM \ 775 _LIBCPP_END_NAMESPACE_STD } } 776 777#define _VSTD_FS _VSTD::__fs::filesystem 778 779#ifndef _LIBCPP_PREFERRED_OVERLOAD 780# if __has_attribute(__enable_if__) 781# define _LIBCPP_PREFERRED_OVERLOAD __attribute__ ((__enable_if__(true, ""))) 782# endif 783#endif 784 785#ifndef _LIBCPP_HAS_NO_NOEXCEPT 786# define _NOEXCEPT noexcept 787# define _NOEXCEPT_(x) noexcept(x) 788#else 789# define _NOEXCEPT throw() 790# define _NOEXCEPT_(x) 791#endif 792 793#ifdef _LIBCPP_HAS_NO_UNICODE_CHARS 794typedef unsigned short char16_t; 795typedef unsigned int char32_t; 796#endif // _LIBCPP_HAS_NO_UNICODE_CHARS 797 798#ifndef __SIZEOF_INT128__ 799#define _LIBCPP_HAS_NO_INT128 800#endif 801 802#ifdef _LIBCPP_CXX03_LANG 803# define static_assert(...) _Static_assert(__VA_ARGS__) 804# define decltype(...) __decltype(__VA_ARGS__) 805#endif // _LIBCPP_CXX03_LANG 806 807#ifdef _LIBCPP_CXX03_LANG 808# define _LIBCPP_CONSTEXPR 809#else 810# define _LIBCPP_CONSTEXPR constexpr 811#endif 812 813#ifdef _LIBCPP_CXX03_LANG 814# define _LIBCPP_DEFAULT {} 815#else 816# define _LIBCPP_DEFAULT = default; 817#endif 818 819#ifdef _LIBCPP_CXX03_LANG 820# define _LIBCPP_EQUAL_DELETE 821#else 822# define _LIBCPP_EQUAL_DELETE = delete 823#endif 824 825#ifdef __GNUC__ 826# define _LIBCPP_NOALIAS __attribute__((__malloc__)) 827#else 828# define _LIBCPP_NOALIAS 829#endif 830 831#if __has_feature(cxx_explicit_conversions) || defined(__IBMCPP__) || \ 832 (!defined(_LIBCPP_CXX03_LANG) && defined(__GNUC__)) // All supported GCC versions 833# define _LIBCPP_EXPLICIT explicit 834#else 835# define _LIBCPP_EXPLICIT 836#endif 837 838#if !__has_builtin(__builtin_operator_new) || !__has_builtin(__builtin_operator_delete) 839#define _LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE 840#endif 841 842#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS 843# define _LIBCPP_DECLARE_STRONG_ENUM(x) struct _LIBCPP_TYPE_VIS x { enum __lx 844# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \ 845 __lx __v_; \ 846 _LIBCPP_INLINE_VISIBILITY x(__lx __v) : __v_(__v) {} \ 847 _LIBCPP_INLINE_VISIBILITY explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \ 848 _LIBCPP_INLINE_VISIBILITY operator int() const {return __v_;} \ 849 }; 850#else // _LIBCPP_HAS_NO_STRONG_ENUMS 851# define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class _LIBCPP_ENUM_VIS x 852# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) 853#endif // _LIBCPP_HAS_NO_STRONG_ENUMS 854 855#ifdef _LIBCPP_DEBUG 856# if _LIBCPP_DEBUG == 0 857# define _LIBCPP_DEBUG_LEVEL 1 858# elif _LIBCPP_DEBUG == 1 859# define _LIBCPP_DEBUG_LEVEL 2 860# else 861# error Supported values for _LIBCPP_DEBUG are 0 and 1 862# endif 863# if !defined(_LIBCPP_BUILDING_LIBRARY) 864# define _LIBCPP_EXTERN_TEMPLATE(...) 865# endif 866#endif 867 868#ifdef _LIBCPP_DISABLE_EXTERN_TEMPLATE 869#define _LIBCPP_EXTERN_TEMPLATE(...) 870#define _LIBCPP_EXTERN_TEMPLATE2(...) 871#endif 872 873#ifndef _LIBCPP_EXTERN_TEMPLATE 874#define _LIBCPP_EXTERN_TEMPLATE(...) extern template __VA_ARGS__; 875#endif 876 877#ifndef _LIBCPP_EXTERN_TEMPLATE2 878#define _LIBCPP_EXTERN_TEMPLATE2(...) extern template __VA_ARGS__; 879#endif 880 881#if defined(__APPLE__) || defined(__FreeBSD__) || defined(_LIBCPP_MSVCRT_LIKE) || \ 882 defined(__sun__) || defined(__NetBSD__) || defined(__CloudABI__) 883#define _LIBCPP_LOCALE__L_EXTENSIONS 1 884#endif 885 886#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)) 887// Most unix variants have catopen. These are the specific ones that don't. 888# if !defined(__BIONIC__) && !defined(_NEWLIB_VERSION) 889# define _LIBCPP_HAS_CATOPEN 1 890# endif 891#endif 892 893#ifdef __FreeBSD__ 894#define _DECLARE_C99_LDBL_MATH 1 895#endif 896 897// If we are getting operator new from the MSVC CRT, then allocation overloads 898// for align_val_t were added in 19.12, aka VS 2017 version 15.3. 899#if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912 900# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 901#elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new) 902 // We're deferring to Microsoft's STL to provide aligned new et al. We don't 903 // have it unless the language feature test macro is defined. 904# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 905#endif 906 907#if defined(__APPLE__) 908# if !defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && \ 909 defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) 910# define __MAC_OS_X_VERSION_MIN_REQUIRED __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ 911# endif 912#endif // defined(__APPLE__) 913 914#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) && \ 915 (defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) || \ 916 (!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606)) 917# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 918#endif 919 920#if defined(__APPLE__) || defined(__FreeBSD__) 921#define _LIBCPP_HAS_DEFAULTRUNELOCALE 922#endif 923 924#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun__) 925#define _LIBCPP_WCTYPE_IS_MASK 926#endif 927 928#if _LIBCPP_STD_VER <= 17 || !defined(__cpp_char8_t) 929#define _LIBCPP_NO_HAS_CHAR8_T 930#endif 931 932// Deprecation macros. 933// 934// Deprecations warnings are always enabled, except when users explicitly opt-out 935// by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS. 936#if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS) 937# if __has_attribute(deprecated) 938# define _LIBCPP_DEPRECATED __attribute__ ((deprecated)) 939# elif _LIBCPP_STD_VER > 11 940# define _LIBCPP_DEPRECATED [[deprecated]] 941# else 942# define _LIBCPP_DEPRECATED 943# endif 944#else 945# define _LIBCPP_DEPRECATED 946#endif 947 948#if !defined(_LIBCPP_CXX03_LANG) 949# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED 950#else 951# define _LIBCPP_DEPRECATED_IN_CXX11 952#endif 953 954#if _LIBCPP_STD_VER >= 14 955# define _LIBCPP_DEPRECATED_IN_CXX14 _LIBCPP_DEPRECATED 956#else 957# define _LIBCPP_DEPRECATED_IN_CXX14 958#endif 959 960#if _LIBCPP_STD_VER >= 17 961# define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED 962#else 963# define _LIBCPP_DEPRECATED_IN_CXX17 964#endif 965 966#if _LIBCPP_STD_VER <= 11 967# define _LIBCPP_EXPLICIT_AFTER_CXX11 968#else 969# define _LIBCPP_EXPLICIT_AFTER_CXX11 explicit 970#endif 971 972#if _LIBCPP_STD_VER > 11 && !defined(_LIBCPP_HAS_NO_CXX14_CONSTEXPR) 973# define _LIBCPP_CONSTEXPR_AFTER_CXX11 constexpr 974#else 975# define _LIBCPP_CONSTEXPR_AFTER_CXX11 976#endif 977 978#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_CXX14_CONSTEXPR) 979# define _LIBCPP_CONSTEXPR_AFTER_CXX14 constexpr 980#else 981# define _LIBCPP_CONSTEXPR_AFTER_CXX14 982#endif 983 984#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CXX14_CONSTEXPR) 985# define _LIBCPP_CONSTEXPR_AFTER_CXX17 constexpr 986#else 987# define _LIBCPP_CONSTEXPR_AFTER_CXX17 988#endif 989 990// The _LIBCPP_NODISCARD_ATTRIBUTE should only be used to define other 991// NODISCARD macros to the correct attribute. 992#if __has_cpp_attribute(nodiscard) || defined(_LIBCPP_COMPILER_MSVC) 993# define _LIBCPP_NODISCARD_ATTRIBUTE [[nodiscard]] 994#elif defined(_LIBCPP_COMPILER_CLANG) && !defined(_LIBCPP_CXX03_LANG) 995# define _LIBCPP_NODISCARD_ATTRIBUTE [[clang::warn_unused_result]] 996#else 997// We can't use GCC's [[gnu::warn_unused_result]] and 998// __attribute__((warn_unused_result)), because GCC does not silence them via 999// (void) cast. 1000# define _LIBCPP_NODISCARD_ATTRIBUTE 1001#endif 1002 1003// _LIBCPP_NODISCARD_EXT may be used to apply [[nodiscard]] to entities not 1004// specified as such as an extension. 1005#if defined(_LIBCPP_ENABLE_NODISCARD) && !defined(_LIBCPP_DISABLE_NODISCARD_EXT) 1006# define _LIBCPP_NODISCARD_EXT _LIBCPP_NODISCARD_ATTRIBUTE 1007#else 1008# define _LIBCPP_NODISCARD_EXT 1009#endif 1010 1011#if !defined(_LIBCPP_DISABLE_NODISCARD_AFTER_CXX17) && \ 1012 (_LIBCPP_STD_VER > 17 || defined(_LIBCPP_ENABLE_NODISCARD)) 1013# define _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_NODISCARD_ATTRIBUTE 1014#else 1015# define _LIBCPP_NODISCARD_AFTER_CXX17 1016#endif 1017 1018#if _LIBCPP_STD_VER > 14 && defined(__cpp_inline_variables) && (__cpp_inline_variables >= 201606L) 1019# define _LIBCPP_INLINE_VAR inline 1020#else 1021# define _LIBCPP_INLINE_VAR 1022#endif 1023 1024#ifdef _LIBCPP_HAS_NO_RVALUE_REFERENCES 1025# define _LIBCPP_EXPLICIT_MOVE(x) _VSTD::move(x) 1026#else 1027# define _LIBCPP_EXPLICIT_MOVE(x) (x) 1028#endif 1029 1030#ifndef _LIBCPP_CONSTEXPR_IF_NODEBUG 1031#if defined(_LIBCPP_DEBUG) || defined(_LIBCPP_HAS_NO_CXX14_CONSTEXPR) 1032#define _LIBCPP_CONSTEXPR_IF_NODEBUG 1033#else 1034#define _LIBCPP_CONSTEXPR_IF_NODEBUG constexpr 1035#endif 1036#endif 1037 1038#if __has_attribute(no_destroy) 1039# define _LIBCPP_NO_DESTROY __attribute__((__no_destroy__)) 1040#else 1041# define _LIBCPP_NO_DESTROY 1042#endif 1043 1044#ifndef _LIBCPP_HAS_NO_ASAN 1045_LIBCPP_FUNC_VIS extern "C" void __sanitizer_annotate_contiguous_container( 1046 const void *, const void *, const void *, const void *); 1047#endif 1048 1049// Try to find out if RTTI is disabled. 1050// g++ and cl.exe have RTTI on by default and define a macro when it is. 1051// g++ only defines the macro in 4.3.2 and onwards. 1052#if !defined(_LIBCPP_NO_RTTI) 1053# if defined(__GNUC__) && \ 1054 ((__GNUC__ >= 5) || \ 1055 (__GNUC__ == 4 && (__GNUC_MINOR__ >= 3 || __GNUC_PATCHLEVEL__ >= 2))) && \ 1056 !defined(__GXX_RTTI) 1057# define _LIBCPP_NO_RTTI 1058# elif defined(_LIBCPP_COMPILER_MSVC) && !defined(_CPPRTTI) 1059# define _LIBCPP_NO_RTTI 1060# endif 1061#endif 1062 1063#ifndef _LIBCPP_WEAK 1064#define _LIBCPP_WEAK __attribute__((__weak__)) 1065#endif 1066 1067// Thread API 1068#if !defined(_LIBCPP_HAS_NO_THREADS) && \ 1069 !defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && \ 1070 !defined(_LIBCPP_HAS_THREAD_API_WIN32) && \ 1071 !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 1072# if defined(__FreeBSD__) || \ 1073 defined(__Fuchsia__) || \ 1074 defined(__wasi__) || \ 1075 defined(__NetBSD__) || \ 1076 defined(__linux__) || \ 1077 defined(__GNU__) || \ 1078 defined(__APPLE__) || \ 1079 defined(__CloudABI__) || \ 1080 defined(__sun__) || \ 1081 (defined(__MINGW32__) && __has_include(<pthread.h>)) 1082# define _LIBCPP_HAS_THREAD_API_PTHREAD 1083# elif defined(_LIBCPP_WIN32API) 1084# define _LIBCPP_HAS_THREAD_API_WIN32 1085# else 1086# error "No thread API" 1087# endif // _LIBCPP_HAS_THREAD_API 1088#endif // _LIBCPP_HAS_NO_THREADS 1089 1090#if defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 1091#if defined(__ANDROID__) && __ANDROID_API__ >= 30 1092#define _LIBCPP_HAS_COND_CLOCKWAIT 1093#elif defined(_LIBCPP_GLIBC_PREREQ) 1094#if _LIBCPP_GLIBC_PREREQ(2, 30) 1095#define _LIBCPP_HAS_COND_CLOCKWAIT 1096#endif 1097#endif 1098#endif 1099 1100#if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 1101#error _LIBCPP_HAS_THREAD_API_PTHREAD may only be defined when \ 1102 _LIBCPP_HAS_NO_THREADS is not defined. 1103#endif 1104 1105#if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 1106#error _LIBCPP_HAS_THREAD_API_EXTERNAL may not be defined when \ 1107 _LIBCPP_HAS_NO_THREADS is defined. 1108#endif 1109 1110#if defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK) && !defined(_LIBCPP_HAS_NO_THREADS) 1111#error _LIBCPP_HAS_NO_MONOTONIC_CLOCK may only be defined when \ 1112 _LIBCPP_HAS_NO_THREADS is defined. 1113#endif 1114 1115#if defined(__STDCPP_THREADS__) && defined(_LIBCPP_HAS_NO_THREADS) 1116#error _LIBCPP_HAS_NO_THREADS cannot be set when __STDCPP_THREADS__ is set. 1117#endif 1118 1119#if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(__STDCPP_THREADS__) 1120#define __STDCPP_THREADS__ 1 1121#endif 1122 1123// The glibc and Bionic implementation of pthreads implements 1124// pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32 1125// mutexes have no destroy mechanism. 1126// 1127// This optimization can't be performed on Apple platforms, where 1128// pthread_mutex_destroy can allow the kernel to release resources. 1129// See https://llvm.org/D64298 for details. 1130// 1131// TODO(EricWF): Enable this optimization on Bionic after speaking to their 1132// respective stakeholders. 1133#if (defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && defined(__GLIBC__)) \ 1134 || defined(_LIBCPP_HAS_THREAD_API_WIN32) 1135# define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 1136#endif 1137 1138// Destroying a condvar is a nop on Windows. 1139// 1140// This optimization can't be performed on Apple platforms, where 1141// pthread_cond_destroy can allow the kernel to release resources. 1142// See https://llvm.org/D64298 for details. 1143// 1144// TODO(EricWF): This is potentially true for some pthread implementations 1145// as well. 1146#if defined(_LIBCPP_HAS_THREAD_API_WIN32) 1147# define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 1148#endif 1149 1150// Systems that use capability-based security (FreeBSD with Capsicum, 1151// Nuxi CloudABI) may only provide local filesystem access (using *at()). 1152// Functions like open(), rename(), unlink() and stat() should not be 1153// used, as they attempt to access the global filesystem namespace. 1154#ifdef __CloudABI__ 1155#define _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE 1156#endif 1157 1158// CloudABI is intended for running networked services. Processes do not 1159// have standard input and output channels. 1160#ifdef __CloudABI__ 1161#define _LIBCPP_HAS_NO_STDIN 1162#define _LIBCPP_HAS_NO_STDOUT 1163#endif 1164 1165// Some systems do not provide gets() in their C library, for security reasons. 1166#ifndef _LIBCPP_C_HAS_NO_GETS 1167# if defined(_LIBCPP_MSVCRT) || (defined(__FreeBSD__) && __FreeBSD__ >= 13) 1168# define _LIBCPP_C_HAS_NO_GETS 1169# endif 1170#endif 1171 1172#if defined(__BIONIC__) || defined(__CloudABI__) || \ 1173 defined(__Fuchsia__) || defined(__wasi__) || defined(_LIBCPP_HAS_MUSL_LIBC) 1174#define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE 1175#endif 1176 1177// Thread-unsafe functions such as strtok() and localtime() 1178// are not available. 1179#ifdef __CloudABI__ 1180#define _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS 1181#endif 1182 1183#if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic) 1184# define _LIBCPP_HAS_C_ATOMIC_IMP 1185#elif defined(_LIBCPP_COMPILER_GCC) 1186# define _LIBCPP_HAS_GCC_ATOMIC_IMP 1187#endif 1188 1189#if (!defined(_LIBCPP_HAS_C_ATOMIC_IMP) && \ 1190 !defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) && \ 1191 !defined(_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP)) \ 1192 || defined(_LIBCPP_HAS_NO_THREADS) 1193# define _LIBCPP_HAS_NO_ATOMIC_HEADER 1194#else 1195# ifndef _LIBCPP_ATOMIC_FLAG_TYPE 1196# define _LIBCPP_ATOMIC_FLAG_TYPE bool 1197# endif 1198# ifdef _LIBCPP_FREESTANDING 1199# define _LIBCPP_ATOMIC_ONLY_USE_BUILTINS 1200# endif 1201#endif 1202 1203#ifndef _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 1204#define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 1205#endif 1206 1207#if defined(_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS) 1208# if defined(__clang__) && __has_attribute(acquire_capability) 1209// Work around the attribute handling in clang. When both __declspec and 1210// __attribute__ are present, the processing goes awry preventing the definition 1211// of the types. 1212# if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 1213# define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 1214# endif 1215# endif 1216#endif 1217 1218#if __has_attribute(require_constant_initialization) 1219# define _LIBCPP_SAFE_STATIC __attribute__((__require_constant_initialization__)) 1220#else 1221# define _LIBCPP_SAFE_STATIC 1222#endif 1223 1224#if !__has_builtin(__builtin_addressof) && _GNUC_VER < 700 1225#define _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF 1226#endif 1227 1228#if !__has_builtin(__builtin_is_constant_evaluated) && _GNUC_VER < 900 1229#define _LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED 1230#endif 1231 1232#if !defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS) 1233# if defined(_LIBCPP_MSVCRT) || defined(_NEWLIB_VERSION) 1234# define _LIBCPP_HAS_NO_OFF_T_FUNCTIONS 1235# endif 1236#endif 1237 1238#if __has_attribute(diagnose_if) && !defined(_LIBCPP_DISABLE_ADDITIONAL_DIAGNOSTICS) 1239# define _LIBCPP_DIAGNOSE_WARNING(...) \ 1240 __attribute__((diagnose_if(__VA_ARGS__, "warning"))) 1241# define _LIBCPP_DIAGNOSE_ERROR(...) \ 1242 __attribute__((diagnose_if(__VA_ARGS__, "error"))) 1243#else 1244# define _LIBCPP_DIAGNOSE_WARNING(...) 1245# define _LIBCPP_DIAGNOSE_ERROR(...) 1246#endif 1247 1248// Use a function like macro to imply that it must be followed by a semicolon 1249#if __cplusplus > 201402L && __has_cpp_attribute(fallthrough) 1250# define _LIBCPP_FALLTHROUGH() [[fallthrough]] 1251#elif __has_cpp_attribute(clang::fallthrough) 1252# define _LIBCPP_FALLTHROUGH() [[clang::fallthrough]] 1253#elif __has_attribute(fallthough) || _GNUC_VER >= 700 1254# define _LIBCPP_FALLTHROUGH() __attribute__((__fallthrough__)) 1255#else 1256# define _LIBCPP_FALLTHROUGH() ((void)0) 1257#endif 1258 1259#if __has_attribute(__nodebug__) 1260#define _LIBCPP_NODEBUG __attribute__((__nodebug__)) 1261#else 1262#define _LIBCPP_NODEBUG 1263#endif 1264 1265#ifndef _LIBCPP_NODEBUG_TYPE 1266#if __has_attribute(__nodebug__) && \ 1267 (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 900) 1268#define _LIBCPP_NODEBUG_TYPE __attribute__((nodebug)) 1269#else 1270#define _LIBCPP_NODEBUG_TYPE 1271#endif 1272#endif // !defined(_LIBCPP_NODEBUG_TYPE) 1273 1274#if defined(_LIBCPP_ABI_MICROSOFT) && \ 1275 (defined(_LIBCPP_COMPILER_MSVC) || __has_declspec_attribute(empty_bases)) 1276# define _LIBCPP_DECLSPEC_EMPTY_BASES __declspec(empty_bases) 1277#else 1278# define _LIBCPP_DECLSPEC_EMPTY_BASES 1279#endif 1280 1281#if defined(_LIBCPP_ENABLE_CXX17_REMOVED_FEATURES) 1282#define _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR 1283#define _LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS 1284#define _LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE 1285#define _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS 1286#endif // _LIBCPP_ENABLE_CXX17_REMOVED_FEATURES 1287 1288#if !defined(__cpp_deduction_guides) || __cpp_deduction_guides < 201611 1289#define _LIBCPP_HAS_NO_DEDUCTION_GUIDES 1290#endif 1291 1292#if !__has_keyword(__is_aggregate) && (_GNUC_VER_NEW < 7001) 1293#define _LIBCPP_HAS_NO_IS_AGGREGATE 1294#endif 1295 1296#if !defined(__cpp_coroutines) || __cpp_coroutines < 201703L 1297#define _LIBCPP_HAS_NO_COROUTINES 1298#endif 1299 1300// FIXME: Correct this macro when either (A) a feature test macro for the 1301// spaceship operator is provided, or (B) a compiler provides a complete 1302// implementation. 1303#define _LIBCPP_HAS_NO_SPACESHIP_OPERATOR 1304 1305// Decide whether to use availability macros. 1306#if !defined(_LIBCPP_BUILDING_LIBRARY) && \ 1307 !defined(_LIBCPP_DISABLE_AVAILABILITY) && \ 1308 __has_feature(attribute_availability_with_strict) && \ 1309 __has_feature(attribute_availability_in_templates) && \ 1310 __has_extension(pragma_clang_attribute_external_declaration) 1311# ifdef __APPLE__ 1312# define _LIBCPP_USE_AVAILABILITY_APPLE 1313# endif 1314#endif 1315 1316// Define availability macros. 1317#if defined(_LIBCPP_USE_AVAILABILITY_APPLE) 1318# define _LIBCPP_AVAILABILITY_SHARED_MUTEX \ 1319 __attribute__((availability(macosx,strict,introduced=10.12))) \ 1320 __attribute__((availability(ios,strict,introduced=10.0))) \ 1321 __attribute__((availability(tvos,strict,introduced=10.0))) \ 1322 __attribute__((availability(watchos,strict,introduced=3.0))) 1323# define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS \ 1324 __attribute__((availability(macosx,strict,introduced=10.14))) \ 1325 __attribute__((availability(ios,strict,introduced=12.0))) \ 1326 __attribute__((availability(tvos,strict,introduced=12.0))) \ 1327 __attribute__((availability(watchos,strict,introduced=5.0))) 1328# define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS \ 1329 _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS 1330# define _LIBCPP_AVAILABILITY_BAD_ANY_CAST \ 1331 _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS 1332# define _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS \ 1333 __attribute__((availability(macosx,strict,introduced=10.12))) \ 1334 __attribute__((availability(ios,strict,introduced=10.0))) \ 1335 __attribute__((availability(tvos,strict,introduced=10.0))) \ 1336 __attribute__((availability(watchos,strict,introduced=3.0))) 1337# define _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE \ 1338 __attribute__((availability(macosx,strict,introduced=10.12))) \ 1339 __attribute__((availability(ios,strict,introduced=10.0))) \ 1340 __attribute__((availability(tvos,strict,introduced=10.0))) \ 1341 __attribute__((availability(watchos,strict,introduced=3.0))) 1342# define _LIBCPP_AVAILABILITY_FUTURE_ERROR \ 1343 __attribute__((availability(ios,strict,introduced=6.0))) 1344# define _LIBCPP_AVAILABILITY_TYPEINFO_VTABLE \ 1345 __attribute__((availability(macosx,strict,introduced=10.9))) \ 1346 __attribute__((availability(ios,strict,introduced=7.0))) 1347# define _LIBCPP_AVAILABILITY_LOCALE_CATEGORY \ 1348 __attribute__((availability(macosx,strict,introduced=10.9))) \ 1349 __attribute__((availability(ios,strict,introduced=7.0))) 1350# define _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR \ 1351 __attribute__((availability(macosx,strict,introduced=10.9))) \ 1352 __attribute__((availability(ios,strict,introduced=7.0))) 1353# define _LIBCPP_AVAILABILITY_FILESYSTEM \ 1354 __attribute__((availability(macosx,strict,introduced=10.15))) \ 1355 __attribute__((availability(ios,strict,introduced=13.0))) \ 1356 __attribute__((availability(tvos,strict,introduced=13.0))) \ 1357 __attribute__((availability(watchos,strict,introduced=6.0))) 1358# define _LIBCPP_AVAILABILITY_FILESYSTEM_PUSH \ 1359 _Pragma("clang attribute push(__attribute__((availability(macosx,strict,introduced=10.15))), apply_to=any(function,record))") \ 1360 _Pragma("clang attribute push(__attribute__((availability(ios,strict,introduced=13.0))), apply_to=any(function,record))") \ 1361 _Pragma("clang attribute push(__attribute__((availability(tvos,strict,introduced=13.0))), apply_to=any(function,record))") \ 1362 _Pragma("clang attribute push(__attribute__((availability(watchos,strict,introduced=6.0))), apply_to=any(function,record))") 1363# define _LIBCPP_AVAILABILITY_FILESYSTEM_POP \ 1364 _Pragma("clang attribute pop") \ 1365 _Pragma("clang attribute pop") \ 1366 _Pragma("clang attribute pop") \ 1367 _Pragma("clang attribute pop") 1368#else 1369# define _LIBCPP_AVAILABILITY_SHARED_MUTEX 1370# define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS 1371# define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS 1372# define _LIBCPP_AVAILABILITY_BAD_ANY_CAST 1373# define _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS 1374# define _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE 1375# define _LIBCPP_AVAILABILITY_FUTURE_ERROR 1376# define _LIBCPP_AVAILABILITY_TYPEINFO_VTABLE 1377# define _LIBCPP_AVAILABILITY_LOCALE_CATEGORY 1378# define _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1379# define _LIBCPP_AVAILABILITY_FILESYSTEM 1380# define _LIBCPP_AVAILABILITY_FILESYSTEM_PUSH 1381# define _LIBCPP_AVAILABILITY_FILESYSTEM_POP 1382#endif 1383 1384// Define availability that depends on _LIBCPP_NO_EXCEPTIONS. 1385#ifdef _LIBCPP_NO_EXCEPTIONS 1386# define _LIBCPP_AVAILABILITY_FUTURE 1387# define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST 1388# define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS 1389# define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 1390#else 1391# define _LIBCPP_AVAILABILITY_FUTURE _LIBCPP_AVAILABILITY_FUTURE_ERROR 1392# define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST _LIBCPP_AVAILABILITY_BAD_ANY_CAST 1393# define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS 1394# define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS 1395#endif 1396 1397// The stream API was dropped and re-added in the dylib shipped on macOS 1398// and iOS. We can only assume the dylib to provide these definitions for 1399// macosx >= 10.9 and ios >= 7.0. Otherwise, the definitions are available 1400// from the headers, but not from the dylib. Explicit instantiation 1401// declarations for streams exist conditionally to this; if we provide 1402// an explicit instantiation declaration and we try to deploy to a dylib 1403// that does not provide those symbols, we'll get a load-time error. 1404#if !defined(_LIBCPP_BUILDING_LIBRARY) && \ 1405 ((defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ 1406 __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1090) || \ 1407 (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && \ 1408 __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 70000)) 1409# define _LIBCPP_DO_NOT_ASSUME_STREAMS_EXPLICIT_INSTANTIATION_IN_DYLIB 1410#endif 1411 1412#if defined(_LIBCPP_COMPILER_IBM) 1413#define _LIBCPP_HAS_NO_PRAGMA_PUSH_POP_MACRO 1414#endif 1415 1416#if defined(_LIBCPP_HAS_NO_PRAGMA_PUSH_POP_MACRO) 1417# define _LIBCPP_PUSH_MACROS 1418# define _LIBCPP_POP_MACROS 1419#else 1420 // Don't warn about macro conflicts when we can restore them at the 1421 // end of the header. 1422# ifndef _LIBCPP_DISABLE_MACRO_CONFLICT_WARNINGS 1423# define _LIBCPP_DISABLE_MACRO_CONFLICT_WARNINGS 1424# endif 1425# if defined(_LIBCPP_COMPILER_MSVC) 1426# define _LIBCPP_PUSH_MACROS \ 1427 __pragma(push_macro("min")) \ 1428 __pragma(push_macro("max")) 1429# define _LIBCPP_POP_MACROS \ 1430 __pragma(pop_macro("min")) \ 1431 __pragma(pop_macro("max")) 1432# else 1433# define _LIBCPP_PUSH_MACROS \ 1434 _Pragma("push_macro(\"min\")") \ 1435 _Pragma("push_macro(\"max\")") 1436# define _LIBCPP_POP_MACROS \ 1437 _Pragma("pop_macro(\"min\")") \ 1438 _Pragma("pop_macro(\"max\")") 1439# endif 1440#endif // defined(_LIBCPP_HAS_NO_PRAGMA_PUSH_POP_MACRO) 1441 1442#ifndef _LIBCPP_NO_AUTO_LINK 1443# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 1444# if defined(_DLL) 1445# pragma comment(lib, "c++.lib") 1446# else 1447# pragma comment(lib, "libc++.lib") 1448# endif 1449# endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 1450#endif // _LIBCPP_NO_AUTO_LINK 1451 1452#define _LIBCPP_UNUSED_VAR(x) ((void)(x)) 1453 1454// Configures the fopen close-on-exec mode character, if any. This string will 1455// be appended to any mode string used by fstream for fopen/fdopen. 1456// 1457// Not all platforms support this, but it helps avoid fd-leaks on platforms that 1458// do. 1459#if defined(__BIONIC__) 1460# define _LIBCPP_FOPEN_CLOEXEC_MODE "e" 1461#else 1462# define _LIBCPP_FOPEN_CLOEXEC_MODE 1463#endif 1464 1465#endif // __cplusplus 1466 1467#endif // _LIBCPP_CONFIG 1468