1 // 2 // Copyright 2017 The Abseil Authors. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // https://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 // ----------------------------------------------------------------------------- 17 // File: config.h 18 // ----------------------------------------------------------------------------- 19 // 20 // This header file defines a set of macros for checking the presence of 21 // important compiler and platform features. Such macros can be used to 22 // produce portable code by parameterizing compilation based on the presence or 23 // lack of a given feature. 24 // 25 // We define a "feature" as some interface we wish to program to: for example, 26 // a library function or system call. A value of `1` indicates support for 27 // that feature; any other value indicates the feature support is undefined. 28 // 29 // Example: 30 // 31 // Suppose a programmer wants to write a program that uses the 'mmap()' system 32 // call. The Abseil macro for that feature (`ABSL_HAVE_MMAP`) allows you to 33 // selectively include the `mmap.h` header and bracket code using that feature 34 // in the macro: 35 // 36 // #include "absl/base/config.h" 37 // 38 // #ifdef ABSL_HAVE_MMAP 39 // #include "sys/mman.h" 40 // #endif //ABSL_HAVE_MMAP 41 // 42 // ... 43 // #ifdef ABSL_HAVE_MMAP 44 // void *ptr = mmap(...); 45 // ... 46 // #endif // ABSL_HAVE_MMAP 47 48 #ifndef ABSL_BASE_CONFIG_H_ 49 #define ABSL_BASE_CONFIG_H_ 50 51 // Included for the __GLIBC__ macro (or similar macros on other systems). 52 #include <limits.h> 53 54 #ifdef __cplusplus 55 // Included for __GLIBCXX__, _LIBCPP_VERSION 56 #include <cstddef> 57 #endif // __cplusplus 58 59 #if defined(__APPLE__) 60 // Included for TARGET_OS_IPHONE, __IPHONE_OS_VERSION_MIN_REQUIRED, 61 // __IPHONE_8_0. 62 #include <Availability.h> 63 #include <TargetConditionals.h> 64 #endif 65 66 #include "absl/base/options.h" 67 #include "absl/base/policy_checks.h" 68 69 // Helper macro to convert a CPP variable to a string literal. 70 #define ABSL_INTERNAL_DO_TOKEN_STR(x) #x 71 #define ABSL_INTERNAL_TOKEN_STR(x) ABSL_INTERNAL_DO_TOKEN_STR(x) 72 73 // ----------------------------------------------------------------------------- 74 // Abseil namespace annotations 75 // ----------------------------------------------------------------------------- 76 77 // ABSL_NAMESPACE_BEGIN/ABSL_NAMESPACE_END 78 // 79 // An annotation placed at the beginning/end of each `namespace absl` scope. 80 // This is used to inject an inline namespace. 81 // 82 // The proper way to write Abseil code in the `absl` namespace is: 83 // 84 // namespace absl { 85 // ABSL_NAMESPACE_BEGIN 86 // 87 // void Foo(); // absl::Foo(). 88 // 89 // ABSL_NAMESPACE_END 90 // } // namespace absl 91 // 92 // Users of Abseil should not use these macros, because users of Abseil should 93 // not write `namespace absl {` in their own code for any reason. (Abseil does 94 // not support forward declarations of its own types, nor does it support 95 // user-provided specialization of Abseil templates. Code that violates these 96 // rules may be broken without warning.) 97 #if !defined(ABSL_OPTION_USE_INLINE_NAMESPACE) || \ 98 !defined(ABSL_OPTION_INLINE_NAMESPACE_NAME) 99 #error options.h is misconfigured. 100 #endif 101 102 // Check that ABSL_OPTION_INLINE_NAMESPACE_NAME is neither "head" nor "" 103 #if defined(__cplusplus) && ABSL_OPTION_USE_INLINE_NAMESPACE == 1 104 105 #define ABSL_INTERNAL_INLINE_NAMESPACE_STR \ 106 ABSL_INTERNAL_TOKEN_STR(ABSL_OPTION_INLINE_NAMESPACE_NAME) 107 108 static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != '\0', 109 "options.h misconfigured: ABSL_OPTION_INLINE_NAMESPACE_NAME must " 110 "not be empty."); 111 static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' || 112 ABSL_INTERNAL_INLINE_NAMESPACE_STR[1] != 'e' || 113 ABSL_INTERNAL_INLINE_NAMESPACE_STR[2] != 'a' || 114 ABSL_INTERNAL_INLINE_NAMESPACE_STR[3] != 'd' || 115 ABSL_INTERNAL_INLINE_NAMESPACE_STR[4] != '\0', 116 "options.h misconfigured: ABSL_OPTION_INLINE_NAMESPACE_NAME must " 117 "be changed to a new, unique identifier name."); 118 119 #endif 120 121 #if ABSL_OPTION_USE_INLINE_NAMESPACE == 0 122 #define ABSL_NAMESPACE_BEGIN 123 #define ABSL_NAMESPACE_END 124 #elif ABSL_OPTION_USE_INLINE_NAMESPACE == 1 125 #define ABSL_NAMESPACE_BEGIN \ 126 inline namespace ABSL_OPTION_INLINE_NAMESPACE_NAME { 127 #define ABSL_NAMESPACE_END } 128 #else 129 #error options.h is misconfigured. 130 #endif 131 132 // ----------------------------------------------------------------------------- 133 // Compiler Feature Checks 134 // ----------------------------------------------------------------------------- 135 136 // ABSL_HAVE_BUILTIN() 137 // 138 // Checks whether the compiler supports a Clang Feature Checking Macro, and if 139 // so, checks whether it supports the provided builtin function "x" where x 140 // is one of the functions noted in 141 // https://clang.llvm.org/docs/LanguageExtensions.html 142 // 143 // Note: Use this macro to avoid an extra level of #ifdef __has_builtin check. 144 // http://releases.llvm.org/3.3/tools/clang/docs/LanguageExtensions.html 145 #ifdef __has_builtin 146 #define ABSL_HAVE_BUILTIN(x) __has_builtin(x) 147 #else 148 #define ABSL_HAVE_BUILTIN(x) 0 149 #endif 150 151 #if defined(__is_identifier) 152 #define ABSL_INTERNAL_HAS_KEYWORD(x) !(__is_identifier(x)) 153 #else 154 #define ABSL_INTERNAL_HAS_KEYWORD(x) 0 155 #endif 156 157 #ifdef __has_feature 158 #define ABSL_HAVE_FEATURE(f) __has_feature(f) 159 #else 160 #define ABSL_HAVE_FEATURE(f) 0 161 #endif 162 163 // ABSL_HAVE_TLS is defined to 1 when __thread should be supported. 164 // We assume __thread is supported on Linux when compiled with Clang or compiled 165 // against libstdc++ with _GLIBCXX_HAVE_TLS defined. 166 #ifdef ABSL_HAVE_TLS 167 #error ABSL_HAVE_TLS cannot be directly set 168 #elif defined(__linux__) && (defined(__clang__) || defined(_GLIBCXX_HAVE_TLS)) 169 #define ABSL_HAVE_TLS 1 170 #endif 171 172 // ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 173 // 174 // Checks whether `std::is_trivially_destructible<T>` is supported. 175 // 176 // Notes: All supported compilers using libc++ support this feature, as does 177 // gcc >= 4.8.1 using libstdc++, and Visual Studio. 178 #ifdef ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 179 #error ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE cannot be directly set 180 #elif defined(_LIBCPP_VERSION) || \ 181 (!defined(__clang__) && defined(__GNUC__) && defined(__GLIBCXX__) && \ 182 (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))) || \ 183 defined(_MSC_VER) 184 #define ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 1 185 #endif 186 187 // ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE 188 // 189 // Checks whether `std::is_trivially_default_constructible<T>` and 190 // `std::is_trivially_copy_constructible<T>` are supported. 191 192 // ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 193 // 194 // Checks whether `std::is_trivially_copy_assignable<T>` is supported. 195 196 // Notes: Clang with libc++ supports these features, as does gcc >= 5.1 with 197 // either libc++ or libstdc++, and Visual Studio (but not NVCC). 198 #if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) 199 #error ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE cannot be directly set 200 #elif defined(ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE) 201 #error ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE cannot directly set 202 #elif (defined(__clang__) && defined(_LIBCPP_VERSION)) || \ 203 (!defined(__clang__) && defined(__GNUC__) && \ 204 (__GNUC__ > 7 || (__GNUC__ == 7 && __GNUC_MINOR__ >= 4)) && \ 205 (defined(_LIBCPP_VERSION) || defined(__GLIBCXX__))) || \ 206 (defined(_MSC_VER) && !defined(__NVCC__)) 207 #define ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE 1 208 #define ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 1 209 #endif 210 211 // ABSL_HAVE_SOURCE_LOCATION_CURRENT 212 // 213 // Indicates whether `absl::SourceLocation::current()` will return useful 214 // information in some contexts. 215 #ifndef ABSL_HAVE_SOURCE_LOCATION_CURRENT 216 #if ABSL_INTERNAL_HAS_KEYWORD(__builtin_LINE) && \ 217 ABSL_INTERNAL_HAS_KEYWORD(__builtin_FILE) 218 #define ABSL_HAVE_SOURCE_LOCATION_CURRENT 1 219 #endif 220 #endif 221 222 // ABSL_HAVE_THREAD_LOCAL 223 // 224 // Checks whether C++11's `thread_local` storage duration specifier is 225 // supported. 226 #ifdef ABSL_HAVE_THREAD_LOCAL 227 #error ABSL_HAVE_THREAD_LOCAL cannot be directly set 228 #elif defined(__APPLE__) 229 // Notes: 230 // * Xcode's clang did not support `thread_local` until version 8, and 231 // even then not for all iOS < 9.0. 232 // * Xcode 9.3 started disallowing `thread_local` for 32-bit iOS simulator 233 // targeting iOS 9.x. 234 // * Xcode 10 moves the deployment target check for iOS < 9.0 to link time 235 // making ABSL_HAVE_FEATURE unreliable there. 236 // 237 #if ABSL_HAVE_FEATURE(cxx_thread_local) && \ 238 !(TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0) 239 #define ABSL_HAVE_THREAD_LOCAL 1 240 #endif 241 #else // !defined(__APPLE__) 242 #define ABSL_HAVE_THREAD_LOCAL 1 243 #endif 244 245 // There are platforms for which TLS should not be used even though the compiler 246 // makes it seem like it's supported (Android NDK < r12b for example). 247 // This is primarily because of linker problems and toolchain misconfiguration: 248 // Abseil does not intend to support this indefinitely. Currently, the newest 249 // toolchain that we intend to support that requires this behavior is the 250 // r11 NDK - allowing for a 5 year support window on that means this option 251 // is likely to be removed around June of 2021. 252 // TLS isn't supported until NDK r12b per 253 // https://developer.android.com/ndk/downloads/revision_history.html 254 // Since NDK r16, `__NDK_MAJOR__` and `__NDK_MINOR__` are defined in 255 // <android/ndk-version.h>. For NDK < r16, users should define these macros, 256 // e.g. `-D__NDK_MAJOR__=11 -D__NKD_MINOR__=0` for NDK r11. 257 #if defined(__ANDROID__) && defined(__clang__) 258 #if __has_include(<android/ndk-version.h>) 259 #include <android/ndk-version.h> 260 #endif // __has_include(<android/ndk-version.h>) 261 #if defined(__ANDROID__) && defined(__clang__) && defined(__NDK_MAJOR__) && \ 262 defined(__NDK_MINOR__) && \ 263 ((__NDK_MAJOR__ < 12) || ((__NDK_MAJOR__ == 12) && (__NDK_MINOR__ < 1))) 264 #undef ABSL_HAVE_TLS 265 #undef ABSL_HAVE_THREAD_LOCAL 266 #endif 267 #endif // defined(__ANDROID__) && defined(__clang__) 268 269 // ABSL_HAVE_INTRINSIC_INT128 270 // 271 // Checks whether the __int128 compiler extension for a 128-bit integral type is 272 // supported. 273 // 274 // Note: __SIZEOF_INT128__ is defined by Clang and GCC when __int128 is 275 // supported, but we avoid using it in certain cases: 276 // * On Clang: 277 // * Building using Clang for Windows, where the Clang runtime library has 278 // 128-bit support only on LP64 architectures, but Windows is LLP64. 279 // * On Nvidia's nvcc: 280 // * nvcc also defines __GNUC__ and __SIZEOF_INT128__, but not all versions 281 // actually support __int128. 282 #ifdef ABSL_HAVE_INTRINSIC_INT128 283 #error ABSL_HAVE_INTRINSIC_INT128 cannot be directly set 284 #elif defined(__SIZEOF_INT128__) 285 #if (defined(__clang__) && !defined(_WIN32)) || \ 286 (defined(__CUDACC__) && __CUDACC_VER_MAJOR__ >= 9) || \ 287 (defined(__GNUC__) && !defined(__clang__) && !defined(__CUDACC__)) 288 #define ABSL_HAVE_INTRINSIC_INT128 1 289 #elif defined(__CUDACC__) 290 // __CUDACC_VER__ is a full version number before CUDA 9, and is defined to a 291 // string explaining that it has been removed starting with CUDA 9. We use 292 // nested #ifs because there is no short-circuiting in the preprocessor. 293 // NOTE: `__CUDACC__` could be undefined while `__CUDACC_VER__` is defined. 294 #if __CUDACC_VER__ >= 70000 295 #define ABSL_HAVE_INTRINSIC_INT128 1 296 #endif // __CUDACC_VER__ >= 70000 297 #endif // defined(__CUDACC__) 298 #endif // ABSL_HAVE_INTRINSIC_INT128 299 300 // ABSL_HAVE_EXCEPTIONS 301 // 302 // Checks whether the compiler both supports and enables exceptions. Many 303 // compilers support a "no exceptions" mode that disables exceptions. 304 // 305 // Generally, when ABSL_HAVE_EXCEPTIONS is not defined: 306 // 307 // * Code using `throw` and `try` may not compile. 308 // * The `noexcept` specifier will still compile and behave as normal. 309 // * The `noexcept` operator may still return `false`. 310 // 311 // For further details, consult the compiler's documentation. 312 #ifdef ABSL_HAVE_EXCEPTIONS 313 #error ABSL_HAVE_EXCEPTIONS cannot be directly set. 314 315 #elif defined(__clang__) 316 317 #if __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 6) 318 // Clang >= 3.6 319 #if ABSL_HAVE_FEATURE(cxx_exceptions) 320 #define ABSL_HAVE_EXCEPTIONS 1 321 #endif // ABSL_HAVE_FEATURE(cxx_exceptions) 322 #else 323 // Clang < 3.6 324 // http://releases.llvm.org/3.6.0/tools/clang/docs/ReleaseNotes.html#the-exceptions-macro 325 #if defined(__EXCEPTIONS) && ABSL_HAVE_FEATURE(cxx_exceptions) 326 #define ABSL_HAVE_EXCEPTIONS 1 327 #endif // defined(__EXCEPTIONS) && ABSL_HAVE_FEATURE(cxx_exceptions) 328 #endif // __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 6) 329 330 // Handle remaining special cases and default to exceptions being supported. 331 #elif !(defined(__GNUC__) && (__GNUC__ < 5) && !defined(__EXCEPTIONS)) && \ 332 !(defined(__GNUC__) && (__GNUC__ >= 5) && !defined(__cpp_exceptions)) && \ 333 !(defined(_MSC_VER) && !defined(_CPPUNWIND)) 334 #define ABSL_HAVE_EXCEPTIONS 1 335 #endif 336 337 // ----------------------------------------------------------------------------- 338 // Platform Feature Checks 339 // ----------------------------------------------------------------------------- 340 341 // Currently supported operating systems and associated preprocessor 342 // symbols: 343 // 344 // Linux and Linux-derived __linux__ 345 // Android __ANDROID__ (implies __linux__) 346 // Linux (non-Android) __linux__ && !__ANDROID__ 347 // Darwin (macOS and iOS) __APPLE__ 348 // Akaros (http://akaros.org) __ros__ 349 // Windows _WIN32 350 // NaCL __native_client__ 351 // AsmJS __asmjs__ 352 // WebAssembly __wasm__ 353 // Fuchsia __Fuchsia__ 354 // 355 // Note that since Android defines both __ANDROID__ and __linux__, one 356 // may probe for either Linux or Android by simply testing for __linux__. 357 358 // ABSL_HAVE_MMAP 359 // 360 // Checks whether the platform has an mmap(2) implementation as defined in 361 // POSIX.1-2001. 362 #ifdef ABSL_HAVE_MMAP 363 #error ABSL_HAVE_MMAP cannot be directly set 364 #elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \ 365 defined(__ros__) || defined(__native_client__) || defined(__asmjs__) || \ 366 defined(__wasm__) || defined(__Fuchsia__) || defined(__sun) || \ 367 defined(__ASYLO__) || defined(__myriad2__) 368 #define ABSL_HAVE_MMAP 1 369 #endif 370 371 // ABSL_HAVE_PTHREAD_GETSCHEDPARAM 372 // 373 // Checks whether the platform implements the pthread_(get|set)schedparam(3) 374 // functions as defined in POSIX.1-2001. 375 #ifdef ABSL_HAVE_PTHREAD_GETSCHEDPARAM 376 #error ABSL_HAVE_PTHREAD_GETSCHEDPARAM cannot be directly set 377 #elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \ 378 defined(__ros__) 379 #define ABSL_HAVE_PTHREAD_GETSCHEDPARAM 1 380 #endif 381 382 // ABSL_HAVE_SCHED_YIELD 383 // 384 // Checks whether the platform implements sched_yield(2) as defined in 385 // POSIX.1-2001. 386 #ifdef ABSL_HAVE_SCHED_YIELD 387 #error ABSL_HAVE_SCHED_YIELD cannot be directly set 388 #elif defined(__linux__) || defined(__ros__) || defined(__native_client__) 389 #define ABSL_HAVE_SCHED_YIELD 1 390 #endif 391 392 // ABSL_HAVE_SEMAPHORE_H 393 // 394 // Checks whether the platform supports the <semaphore.h> header and sem_init(3) 395 // family of functions as standardized in POSIX.1-2001. 396 // 397 // Note: While Apple provides <semaphore.h> for both iOS and macOS, it is 398 // explicitly deprecated and will cause build failures if enabled for those 399 // platforms. We side-step the issue by not defining it here for Apple 400 // platforms. 401 #ifdef ABSL_HAVE_SEMAPHORE_H 402 #error ABSL_HAVE_SEMAPHORE_H cannot be directly set 403 #elif defined(__linux__) || defined(__ros__) 404 #define ABSL_HAVE_SEMAPHORE_H 1 405 #endif 406 407 // ABSL_HAVE_ALARM 408 // 409 // Checks whether the platform supports the <signal.h> header and alarm(2) 410 // function as standardized in POSIX.1-2001. 411 #ifdef ABSL_HAVE_ALARM 412 #error ABSL_HAVE_ALARM cannot be directly set 413 #elif defined(__GOOGLE_GRTE_VERSION__) 414 // feature tests for Google's GRTE 415 #define ABSL_HAVE_ALARM 1 416 #elif defined(__GLIBC__) 417 // feature test for glibc 418 #define ABSL_HAVE_ALARM 1 419 #elif defined(_MSC_VER) 420 // feature tests for Microsoft's library 421 #elif defined(__MINGW32__) 422 // mingw32 doesn't provide alarm(2): 423 // https://osdn.net/projects/mingw/scm/git/mingw-org-wsl/blobs/5.2-trunk/mingwrt/include/unistd.h 424 // mingw-w64 provides a no-op implementation: 425 // https://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-crt/misc/alarm.c 426 #elif defined(__EMSCRIPTEN__) 427 // emscripten doesn't support signals 428 #elif defined(__Fuchsia__) 429 // Signals don't exist on fuchsia. 430 #elif defined(__native_client__) 431 #else 432 // other standard libraries 433 #define ABSL_HAVE_ALARM 1 434 #endif 435 436 // ABSL_IS_LITTLE_ENDIAN 437 // ABSL_IS_BIG_ENDIAN 438 // 439 // Checks the endianness of the platform. 440 // 441 // Notes: uses the built in endian macros provided by GCC (since 4.6) and 442 // Clang (since 3.2); see 443 // https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html. 444 // Otherwise, if _WIN32, assume little endian. Otherwise, bail with an error. 445 #if defined(ABSL_IS_BIG_ENDIAN) 446 #error "ABSL_IS_BIG_ENDIAN cannot be directly set." 447 #endif 448 #if defined(ABSL_IS_LITTLE_ENDIAN) 449 #error "ABSL_IS_LITTLE_ENDIAN cannot be directly set." 450 #endif 451 452 #if (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \ 453 __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) 454 #define ABSL_IS_LITTLE_ENDIAN 1 455 #elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \ 456 __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 457 #define ABSL_IS_BIG_ENDIAN 1 458 #elif defined(_WIN32) 459 #define ABSL_IS_LITTLE_ENDIAN 1 460 #else 461 #error "absl endian detection needs to be set up for your compiler" 462 #endif 463 464 // macOS 10.13 and iOS 10.11 don't let you use <any>, <optional>, or <variant> 465 // even though the headers exist and are publicly noted to work. See 466 // https://github.com/abseil/abseil-cpp/issues/207 and 467 // https://developer.apple.com/documentation/xcode_release_notes/xcode_10_release_notes 468 // libc++ spells out the availability requirements in the file 469 // llvm-project/libcxx/include/__config via the #define 470 // _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS. 471 #if defined(__APPLE__) && defined(_LIBCPP_VERSION) && \ 472 ((defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ 473 __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101400) || \ 474 (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && \ 475 __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 120000) || \ 476 (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && \ 477 __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000) || \ 478 (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && \ 479 __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 120000)) 480 #define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 1 481 #else 482 #define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 0 483 #endif 484 485 // ABSL_HAVE_STD_ANY 486 // 487 // Checks whether C++17 std::any is available by checking whether <any> exists. 488 #ifdef ABSL_HAVE_STD_ANY 489 #error "ABSL_HAVE_STD_ANY cannot be directly set." 490 #endif 491 492 #ifdef __has_include 493 #if __has_include(<any>) && __cplusplus >= 201703L && \ 494 !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 495 #define ABSL_HAVE_STD_ANY 1 496 #endif 497 #endif 498 499 // ABSL_HAVE_STD_OPTIONAL 500 // 501 // Checks whether C++17 std::optional is available. 502 #ifdef ABSL_HAVE_STD_OPTIONAL 503 #error "ABSL_HAVE_STD_OPTIONAL cannot be directly set." 504 #endif 505 506 #ifdef __has_include 507 #if __has_include(<optional>) && __cplusplus >= 201703L && \ 508 !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 509 #define ABSL_HAVE_STD_OPTIONAL 1 510 #endif 511 #endif 512 513 // ABSL_HAVE_STD_VARIANT 514 // 515 // Checks whether C++17 std::variant is available. 516 #ifdef ABSL_HAVE_STD_VARIANT 517 #error "ABSL_HAVE_STD_VARIANT cannot be directly set." 518 #endif 519 520 #ifdef __has_include 521 #if __has_include(<variant>) && __cplusplus >= 201703L && \ 522 !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 523 #define ABSL_HAVE_STD_VARIANT 1 524 #endif 525 #endif 526 527 // ABSL_HAVE_STD_STRING_VIEW 528 // 529 // Checks whether C++17 std::string_view is available. 530 #ifdef ABSL_HAVE_STD_STRING_VIEW 531 #error "ABSL_HAVE_STD_STRING_VIEW cannot be directly set." 532 #endif 533 534 #ifdef __has_include 535 #if __has_include(<string_view>) && __cplusplus >= 201703L 536 #define ABSL_HAVE_STD_STRING_VIEW 1 537 #endif 538 #endif 539 540 // For MSVC, `__has_include` is supported in VS 2017 15.3, which is later than 541 // the support for <optional>, <any>, <string_view>, <variant>. So we use 542 // _MSC_VER to check whether we have VS 2017 RTM (when <optional>, <any>, 543 // <string_view>, <variant> is implemented) or higher. Also, `__cplusplus` is 544 // not correctly set by MSVC, so we use `_MSVC_LANG` to check the language 545 // version. 546 // TODO(zhangxy): fix tests before enabling aliasing for `std::any`. 547 #if defined(_MSC_VER) && _MSC_VER >= 1910 && \ 548 ((defined(_MSVC_LANG) && _MSVC_LANG > 201402) || __cplusplus > 201402) 549 // #define ABSL_HAVE_STD_ANY 1 550 #define ABSL_HAVE_STD_OPTIONAL 1 551 #define ABSL_HAVE_STD_VARIANT 1 552 #define ABSL_HAVE_STD_STRING_VIEW 1 553 #endif 554 555 // ABSL_USES_STD_ANY 556 // 557 // Indicates whether absl::any is an alias for std::any. 558 #if !defined(ABSL_OPTION_USE_STD_ANY) 559 #error options.h is misconfigured. 560 #elif ABSL_OPTION_USE_STD_ANY == 0 || \ 561 (ABSL_OPTION_USE_STD_ANY == 2 && !defined(ABSL_HAVE_STD_ANY)) 562 #undef ABSL_USES_STD_ANY 563 #elif ABSL_OPTION_USE_STD_ANY == 1 || \ 564 (ABSL_OPTION_USE_STD_ANY == 2 && defined(ABSL_HAVE_STD_ANY)) 565 #define ABSL_USES_STD_ANY 1 566 #else 567 #error options.h is misconfigured. 568 #endif 569 570 // ABSL_USES_STD_OPTIONAL 571 // 572 // Indicates whether absl::optional is an alias for std::optional. 573 #if !defined(ABSL_OPTION_USE_STD_OPTIONAL) 574 #error options.h is misconfigured. 575 #elif ABSL_OPTION_USE_STD_OPTIONAL == 0 || \ 576 (ABSL_OPTION_USE_STD_OPTIONAL == 2 && !defined(ABSL_HAVE_STD_OPTIONAL)) 577 #undef ABSL_USES_STD_OPTIONAL 578 #elif ABSL_OPTION_USE_STD_OPTIONAL == 1 || \ 579 (ABSL_OPTION_USE_STD_OPTIONAL == 2 && defined(ABSL_HAVE_STD_OPTIONAL)) 580 #define ABSL_USES_STD_OPTIONAL 1 581 #else 582 #error options.h is misconfigured. 583 #endif 584 585 // ABSL_USES_STD_VARIANT 586 // 587 // Indicates whether absl::variant is an alias for std::variant. 588 #if !defined(ABSL_OPTION_USE_STD_VARIANT) 589 #error options.h is misconfigured. 590 #elif ABSL_OPTION_USE_STD_VARIANT == 0 || \ 591 (ABSL_OPTION_USE_STD_VARIANT == 2 && !defined(ABSL_HAVE_STD_VARIANT)) 592 #undef ABSL_USES_STD_VARIANT 593 #elif ABSL_OPTION_USE_STD_VARIANT == 1 || \ 594 (ABSL_OPTION_USE_STD_VARIANT == 2 && defined(ABSL_HAVE_STD_VARIANT)) 595 #define ABSL_USES_STD_VARIANT 1 596 #else 597 #error options.h is misconfigured. 598 #endif 599 600 // ABSL_USES_STD_STRING_VIEW 601 // 602 // Indicates whether absl::string_view is an alias for std::string_view. 603 #if !defined(ABSL_OPTION_USE_STD_STRING_VIEW) 604 #error options.h is misconfigured. 605 #elif ABSL_OPTION_USE_STD_STRING_VIEW == 0 || \ 606 (ABSL_OPTION_USE_STD_STRING_VIEW == 2 && \ 607 !defined(ABSL_HAVE_STD_STRING_VIEW)) 608 #undef ABSL_USES_STD_STRING_VIEW 609 #elif ABSL_OPTION_USE_STD_STRING_VIEW == 1 || \ 610 (ABSL_OPTION_USE_STD_STRING_VIEW == 2 && \ 611 defined(ABSL_HAVE_STD_STRING_VIEW)) 612 #define ABSL_USES_STD_STRING_VIEW 1 613 #else 614 #error options.h is misconfigured. 615 #endif 616 617 // In debug mode, MSVC 2017's std::variant throws a EXCEPTION_ACCESS_VIOLATION 618 // SEH exception from emplace for variant<SomeStruct> when constructing the 619 // struct can throw. This defeats some of variant_test and 620 // variant_exception_safety_test. 621 #if defined(_MSC_VER) && _MSC_VER >= 1700 && defined(_DEBUG) 622 #define ABSL_INTERNAL_MSVC_2017_DBG_MODE 623 #endif 624 625 // ABSL_INTERNAL_MANGLED_NS 626 // ABSL_INTERNAL_MANGLED_BACKREFERENCE 627 // 628 // Internal macros for building up mangled names in our internal fork of CCTZ. 629 // This implementation detail is only needed and provided for the MSVC build. 630 // 631 // These macros both expand to string literals. ABSL_INTERNAL_MANGLED_NS is 632 // the mangled spelling of the `absl` namespace, and 633 // ABSL_INTERNAL_MANGLED_BACKREFERENCE is a back-reference integer representing 634 // the proper count to skip past the CCTZ fork namespace names. (This number 635 // is one larger when there is an inline namespace name to skip.) 636 #if defined(_MSC_VER) 637 #if ABSL_OPTION_USE_INLINE_NAMESPACE == 0 638 #define ABSL_INTERNAL_MANGLED_NS "absl" 639 #define ABSL_INTERNAL_MANGLED_BACKREFERENCE "5" 640 #else 641 #define ABSL_INTERNAL_MANGLED_NS \ 642 ABSL_INTERNAL_TOKEN_STR(ABSL_OPTION_INLINE_NAMESPACE_NAME) "@absl" 643 #define ABSL_INTERNAL_MANGLED_BACKREFERENCE "6" 644 #endif 645 #endif 646 647 #undef ABSL_INTERNAL_HAS_KEYWORD 648 649 // ABSL_DLL 650 // 651 // When building Abseil as a DLL, this macro expands to `__declspec(dllexport)` 652 // so we can annotate symbols appropriately as being exported. When used in 653 // headers consuming a DLL, this macro expands to `__declspec(dllimport)` so 654 // that consumers know the symbol is defined inside the DLL. In all other cases, 655 // the macro expands to nothing. 656 #if defined(_MSC_VER) 657 #if defined(ABSL_BUILD_DLL) 658 #define ABSL_DLL __declspec(dllexport) 659 #elif defined(ABSL_CONSUME_DLL) 660 #define ABSL_DLL __declspec(dllimport) 661 #else 662 #define ABSL_DLL 663 #endif 664 #else 665 #define ABSL_DLL 666 #endif // defined(_MSC_VER) 667 668 // ABSL_HAVE_MEMORY_SANITIZER 669 // 670 // MemorySanitizer (MSan) is a detector of uninitialized reads. It consists of 671 // a compiler instrumentation module and a run-time library. 672 #ifdef ABSL_HAVE_MEMORY_SANITIZER 673 #error "ABSL_HAVE_MEMORY_SANITIZER cannot be directly set." 674 #elif defined(MEMORY_SANITIZER) 675 // The MEMORY_SANITIZER macro is deprecated but we will continue to honor it 676 // for now. 677 #define ABSL_HAVE_MEMORY_SANITIZER 1 678 #elif defined(__SANITIZE_MEMORY__) 679 #define ABSL_HAVE_MEMORY_SANITIZER 1 680 #elif !defined(__native_client__) && ABSL_HAVE_FEATURE(memory_sanitizer) 681 #define ABSL_HAVE_MEMORY_SANITIZER 1 682 #endif 683 684 // ABSL_HAVE_THREAD_SANITIZER 685 // 686 // ThreadSanitizer (TSan) is a fast data race detector. 687 #ifdef ABSL_HAVE_THREAD_SANITIZER 688 #error "ABSL_HAVE_THREAD_SANITIZER cannot be directly set." 689 #elif defined(THREAD_SANITIZER) 690 // The THREAD_SANITIZER macro is deprecated but we will continue to honor it 691 // for now. 692 #define ABSL_HAVE_THREAD_SANITIZER 1 693 #elif defined(__SANITIZE_THREAD__) 694 #define ABSL_HAVE_THREAD_SANITIZER 1 695 #elif ABSL_HAVE_FEATURE(thread_sanitizer) 696 #define ABSL_HAVE_THREAD_SANITIZER 1 697 #endif 698 699 // ABSL_HAVE_ADDRESS_SANITIZER 700 // 701 // AddressSanitizer (ASan) is a fast memory error detector. 702 #ifdef ABSL_HAVE_ADDRESS_SANITIZER 703 #error "ABSL_HAVE_ADDRESS_SANITIZER cannot be directly set." 704 #elif defined(ADDRESS_SANITIZER) 705 // The ADDRESS_SANITIZER macro is deprecated but we will continue to honor it 706 // for now. 707 #define ABSL_HAVE_ADDRESS_SANITIZER 1 708 #elif defined(__SANITIZE_ADDRESS__) 709 #define ABSL_HAVE_ADDRESS_SANITIZER 1 710 #elif ABSL_HAVE_FEATURE(address_sanitizer) 711 #define ABSL_HAVE_ADDRESS_SANITIZER 1 712 #endif 713 714 #endif // ABSL_BASE_CONFIG_H_ 715