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 // ABSL_INTERNAL_CPLUSPLUS_LANG 60 // 61 // MSVC does not set the value of __cplusplus correctly, but instead uses 62 // _MSVC_LANG as a stand-in. 63 // https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros 64 // 65 // However, there are reports that MSVC even sets _MSVC_LANG incorrectly at 66 // times, for example: 67 // https://github.com/microsoft/vscode-cpptools/issues/1770 68 // https://reviews.llvm.org/D70996 69 // 70 // For this reason, this symbol is considered INTERNAL and code outside of 71 // Abseil must not use it. 72 #if defined(_MSVC_LANG) 73 #define ABSL_INTERNAL_CPLUSPLUS_LANG _MSVC_LANG 74 #elif defined(__cplusplus) 75 #define ABSL_INTERNAL_CPLUSPLUS_LANG __cplusplus 76 #endif 77 78 #if defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \ 79 ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L 80 // Include library feature test macros. 81 #include <version> 82 #endif 83 84 #if defined(__APPLE__) 85 // Included for TARGET_OS_IPHONE, __IPHONE_OS_VERSION_MIN_REQUIRED, 86 // __IPHONE_8_0. 87 #include <Availability.h> 88 #include <TargetConditionals.h> 89 #endif 90 91 #include "absl/base/options.h" 92 #include "absl/base/policy_checks.h" 93 94 // Abseil long-term support (LTS) releases will define 95 // `ABSL_LTS_RELEASE_VERSION` to the integer representing the date string of the 96 // LTS release version, and will define `ABSL_LTS_RELEASE_PATCH_LEVEL` to the 97 // integer representing the patch-level for that release. 98 // 99 // For example, for LTS release version "20300401.2", this would give us 100 // ABSL_LTS_RELEASE_VERSION == 20300401 && ABSL_LTS_RELEASE_PATCH_LEVEL == 2 101 // 102 // These symbols will not be defined in non-LTS code. 103 // 104 // Abseil recommends that clients live-at-head. Therefore, if you are using 105 // these symbols to assert a minimum version requirement, we recommend you do it 106 // as 107 // 108 // #if defined(ABSL_LTS_RELEASE_VERSION) && ABSL_LTS_RELEASE_VERSION < 20300401 109 // #error Project foo requires Abseil LTS version >= 20300401 110 // #endif 111 // 112 // The `defined(ABSL_LTS_RELEASE_VERSION)` part of the check excludes 113 // live-at-head clients from the minimum version assertion. 114 // 115 // See https://abseil.io/about/releases for more information on Abseil release 116 // management. 117 // 118 // LTS releases can be obtained from 119 // https://github.com/abseil/abseil-cpp/releases. 120 #undef ABSL_LTS_RELEASE_VERSION 121 #undef ABSL_LTS_RELEASE_PATCH_LEVEL 122 123 // Helper macro to convert a CPP variable to a string literal. 124 #define ABSL_INTERNAL_DO_TOKEN_STR(x) #x 125 #define ABSL_INTERNAL_TOKEN_STR(x) ABSL_INTERNAL_DO_TOKEN_STR(x) 126 127 // ----------------------------------------------------------------------------- 128 // Abseil namespace annotations 129 // ----------------------------------------------------------------------------- 130 131 // ABSL_NAMESPACE_BEGIN/ABSL_NAMESPACE_END 132 // 133 // An annotation placed at the beginning/end of each `namespace absl` scope. 134 // This is used to inject an inline namespace. 135 // 136 // The proper way to write Abseil code in the `absl` namespace is: 137 // 138 // namespace absl { 139 // ABSL_NAMESPACE_BEGIN 140 // 141 // void Foo(); // absl::Foo(). 142 // 143 // ABSL_NAMESPACE_END 144 // } // namespace absl 145 // 146 // Users of Abseil should not use these macros, because users of Abseil should 147 // not write `namespace absl {` in their own code for any reason. (Abseil does 148 // not support forward declarations of its own types, nor does it support 149 // user-provided specialization of Abseil templates. Code that violates these 150 // rules may be broken without warning.) 151 #if !defined(ABSL_OPTION_USE_INLINE_NAMESPACE) || \ 152 !defined(ABSL_OPTION_INLINE_NAMESPACE_NAME) 153 #error options.h is misconfigured. 154 #endif 155 156 // Check that ABSL_OPTION_INLINE_NAMESPACE_NAME is neither "head" nor "" 157 #if defined(__cplusplus) && ABSL_OPTION_USE_INLINE_NAMESPACE == 1 158 159 #define ABSL_INTERNAL_INLINE_NAMESPACE_STR \ 160 ABSL_INTERNAL_TOKEN_STR(ABSL_OPTION_INLINE_NAMESPACE_NAME) 161 162 static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != '\0', 163 "options.h misconfigured: ABSL_OPTION_INLINE_NAMESPACE_NAME must " 164 "not be empty."); 165 static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' || 166 ABSL_INTERNAL_INLINE_NAMESPACE_STR[1] != 'e' || 167 ABSL_INTERNAL_INLINE_NAMESPACE_STR[2] != 'a' || 168 ABSL_INTERNAL_INLINE_NAMESPACE_STR[3] != 'd' || 169 ABSL_INTERNAL_INLINE_NAMESPACE_STR[4] != '\0', 170 "options.h misconfigured: ABSL_OPTION_INLINE_NAMESPACE_NAME must " 171 "be changed to a new, unique identifier name."); 172 173 #endif 174 175 #if ABSL_OPTION_USE_INLINE_NAMESPACE == 0 176 #define ABSL_NAMESPACE_BEGIN 177 #define ABSL_NAMESPACE_END 178 #define ABSL_INTERNAL_C_SYMBOL(x) x 179 #elif ABSL_OPTION_USE_INLINE_NAMESPACE == 1 180 #define ABSL_NAMESPACE_BEGIN \ 181 inline namespace ABSL_OPTION_INLINE_NAMESPACE_NAME { 182 #define ABSL_NAMESPACE_END } 183 #define ABSL_INTERNAL_C_SYMBOL_HELPER_2(x, v) x##_##v 184 #define ABSL_INTERNAL_C_SYMBOL_HELPER_1(x, v) \ 185 ABSL_INTERNAL_C_SYMBOL_HELPER_2(x, v) 186 #define ABSL_INTERNAL_C_SYMBOL(x) \ 187 ABSL_INTERNAL_C_SYMBOL_HELPER_1(x, ABSL_OPTION_INLINE_NAMESPACE_NAME) 188 #else 189 #error options.h is misconfigured. 190 #endif 191 192 // ----------------------------------------------------------------------------- 193 // Compiler Feature Checks 194 // ----------------------------------------------------------------------------- 195 196 // ABSL_HAVE_BUILTIN() 197 // 198 // Checks whether the compiler supports a Clang Feature Checking Macro, and if 199 // so, checks whether it supports the provided builtin function "x" where x 200 // is one of the functions noted in 201 // https://clang.llvm.org/docs/LanguageExtensions.html 202 // 203 // Note: Use this macro to avoid an extra level of #ifdef __has_builtin check. 204 // http://releases.llvm.org/3.3/tools/clang/docs/LanguageExtensions.html 205 #ifdef __has_builtin 206 #define ABSL_HAVE_BUILTIN(x) __has_builtin(x) 207 #else 208 #define ABSL_HAVE_BUILTIN(x) 0 209 #endif 210 211 #ifdef __has_feature 212 #define ABSL_HAVE_FEATURE(f) __has_feature(f) 213 #else 214 #define ABSL_HAVE_FEATURE(f) 0 215 #endif 216 217 // Portable check for GCC minimum version: 218 // https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html 219 #if defined(__GNUC__) && defined(__GNUC_MINOR__) 220 #define ABSL_INTERNAL_HAVE_MIN_GNUC_VERSION(x, y) \ 221 (__GNUC__ > (x) || __GNUC__ == (x) && __GNUC_MINOR__ >= (y)) 222 #else 223 #define ABSL_INTERNAL_HAVE_MIN_GNUC_VERSION(x, y) 0 224 #endif 225 226 #if defined(__clang__) && defined(__clang_major__) && defined(__clang_minor__) 227 #define ABSL_INTERNAL_HAVE_MIN_CLANG_VERSION(x, y) \ 228 (__clang_major__ > (x) || __clang_major__ == (x) && __clang_minor__ >= (y)) 229 #else 230 #define ABSL_INTERNAL_HAVE_MIN_CLANG_VERSION(x, y) 0 231 #endif 232 233 // ABSL_HAVE_TLS is defined to 1 when __thread should be supported. 234 // We assume __thread is supported on Linux or Asylo when compiled with Clang or 235 // compiled against libstdc++ with _GLIBCXX_HAVE_TLS defined. 236 #ifdef ABSL_HAVE_TLS 237 #error ABSL_HAVE_TLS cannot be directly set 238 #elif (defined(__linux__) || defined(__ASYLO__)) && \ 239 (defined(__clang__) || defined(_GLIBCXX_HAVE_TLS)) 240 #define ABSL_HAVE_TLS 1 241 #endif 242 243 // ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 244 // 245 // Checks whether `std::is_trivially_destructible<T>` is supported. 246 #ifdef ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 247 #error ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE cannot be directly set 248 #define ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 1 249 #endif 250 251 // ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE 252 // 253 // Checks whether `std::is_trivially_default_constructible<T>` and 254 // `std::is_trivially_copy_constructible<T>` are supported. 255 #ifdef ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE 256 #error ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE cannot be directly set 257 #else 258 #define ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE 1 259 #endif 260 261 // ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 262 // 263 // Checks whether `std::is_trivially_copy_assignable<T>` is supported. 264 #ifdef ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 265 #error ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE cannot be directly set 266 #else 267 #define ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 1 268 #endif 269 270 // ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE 271 // 272 // Checks whether `std::is_trivially_copyable<T>` is supported. 273 #ifdef ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE 274 #error ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE cannot be directly set 275 #define ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE 1 276 #endif 277 278 // ABSL_HAVE_THREAD_LOCAL 279 // 280 // Checks whether C++11's `thread_local` storage duration specifier is 281 // supported. 282 #ifdef ABSL_HAVE_THREAD_LOCAL 283 #error ABSL_HAVE_THREAD_LOCAL cannot be directly set 284 #elif defined(__APPLE__) 285 // Notes: 286 // * Xcode's clang did not support `thread_local` until version 8, and 287 // even then not for all iOS < 9.0. 288 // * Xcode 9.3 started disallowing `thread_local` for 32-bit iOS simulator 289 // targeting iOS 9.x. 290 // * Xcode 10 moves the deployment target check for iOS < 9.0 to link time 291 // making ABSL_HAVE_FEATURE unreliable there. 292 // 293 #if ABSL_HAVE_FEATURE(cxx_thread_local) && \ 294 !(TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0) 295 #define ABSL_HAVE_THREAD_LOCAL 1 296 #endif 297 #else // !defined(__APPLE__) 298 #define ABSL_HAVE_THREAD_LOCAL 1 299 #endif 300 301 // There are platforms for which TLS should not be used even though the compiler 302 // makes it seem like it's supported (Android NDK < r12b for example). 303 // This is primarily because of linker problems and toolchain misconfiguration: 304 // Abseil does not intend to support this indefinitely. Currently, the newest 305 // toolchain that we intend to support that requires this behavior is the 306 // r11 NDK - allowing for a 5 year support window on that means this option 307 // is likely to be removed around June of 2021. 308 // TLS isn't supported until NDK r12b per 309 // https://developer.android.com/ndk/downloads/revision_history.html 310 // Since NDK r16, `__NDK_MAJOR__` and `__NDK_MINOR__` are defined in 311 // <android/ndk-version.h>. For NDK < r16, users should define these macros, 312 // e.g. `-D__NDK_MAJOR__=11 -D__NKD_MINOR__=0` for NDK r11. 313 #if defined(__ANDROID__) && defined(__clang__) 314 #if __has_include(<android/ndk-version.h>) 315 #include <android/ndk-version.h> 316 #endif // __has_include(<android/ndk-version.h>) 317 #if defined(__ANDROID__) && defined(__clang__) && defined(__NDK_MAJOR__) && \ 318 defined(__NDK_MINOR__) && \ 319 ((__NDK_MAJOR__ < 12) || ((__NDK_MAJOR__ == 12) && (__NDK_MINOR__ < 1))) 320 #undef ABSL_HAVE_TLS 321 #undef ABSL_HAVE_THREAD_LOCAL 322 #endif 323 #endif // defined(__ANDROID__) && defined(__clang__) 324 325 // ABSL_HAVE_INTRINSIC_INT128 326 // 327 // Checks whether the __int128 compiler extension for a 128-bit integral type is 328 // supported. 329 // 330 // Note: __SIZEOF_INT128__ is defined by Clang and GCC when __int128 is 331 // supported, but we avoid using it in certain cases: 332 // * On Clang: 333 // * Building using Clang for Windows, where the Clang runtime library has 334 // 128-bit support only on LP64 architectures, but Windows is LLP64. 335 // * On Nvidia's nvcc: 336 // * nvcc also defines __GNUC__ and __SIZEOF_INT128__, but not all versions 337 // actually support __int128. 338 #ifdef ABSL_HAVE_INTRINSIC_INT128 339 #error ABSL_HAVE_INTRINSIC_INT128 cannot be directly set 340 #elif defined(__SIZEOF_INT128__) 341 #if (defined(__clang__) && !defined(_WIN32)) || \ 342 (defined(__CUDACC__) && __CUDACC_VER_MAJOR__ >= 9) || \ 343 (defined(__GNUC__) && !defined(__clang__) && !defined(__CUDACC__)) 344 #define ABSL_HAVE_INTRINSIC_INT128 1 345 #elif defined(__CUDACC__) 346 // __CUDACC_VER__ is a full version number before CUDA 9, and is defined to a 347 // string explaining that it has been removed starting with CUDA 9. We use 348 // nested #ifs because there is no short-circuiting in the preprocessor. 349 // NOTE: `__CUDACC__` could be undefined while `__CUDACC_VER__` is defined. 350 #if __CUDACC_VER__ >= 70000 351 #define ABSL_HAVE_INTRINSIC_INT128 1 352 #endif // __CUDACC_VER__ >= 70000 353 #endif // defined(__CUDACC__) 354 #endif // ABSL_HAVE_INTRINSIC_INT128 355 356 // ABSL_HAVE_EXCEPTIONS 357 // 358 // Checks whether the compiler both supports and enables exceptions. Many 359 // compilers support a "no exceptions" mode that disables exceptions. 360 // 361 // Generally, when ABSL_HAVE_EXCEPTIONS is not defined: 362 // 363 // * Code using `throw` and `try` may not compile. 364 // * The `noexcept` specifier will still compile and behave as normal. 365 // * The `noexcept` operator may still return `false`. 366 // 367 // For further details, consult the compiler's documentation. 368 #ifdef ABSL_HAVE_EXCEPTIONS 369 #error ABSL_HAVE_EXCEPTIONS cannot be directly set. 370 #elif ABSL_INTERNAL_HAVE_MIN_CLANG_VERSION(3, 6) 371 // Clang >= 3.6 372 #if ABSL_HAVE_FEATURE(cxx_exceptions) 373 #define ABSL_HAVE_EXCEPTIONS 1 374 #endif // ABSL_HAVE_FEATURE(cxx_exceptions) 375 #elif defined(__clang__) 376 // Clang < 3.6 377 // http://releases.llvm.org/3.6.0/tools/clang/docs/ReleaseNotes.html#the-exceptions-macro 378 #if defined(__EXCEPTIONS) && ABSL_HAVE_FEATURE(cxx_exceptions) 379 #define ABSL_HAVE_EXCEPTIONS 1 380 #endif // defined(__EXCEPTIONS) && ABSL_HAVE_FEATURE(cxx_exceptions) 381 // Handle remaining special cases and default to exceptions being supported. 382 #elif !(defined(__GNUC__) && !defined(__cpp_exceptions)) && \ 383 !(defined(_MSC_VER) && !defined(_CPPUNWIND)) 384 #define ABSL_HAVE_EXCEPTIONS 1 385 #endif 386 387 // ----------------------------------------------------------------------------- 388 // Platform Feature Checks 389 // ----------------------------------------------------------------------------- 390 391 // Currently supported operating systems and associated preprocessor 392 // symbols: 393 // 394 // Linux and Linux-derived __linux__ 395 // Android __ANDROID__ (implies __linux__) 396 // Linux (non-Android) __linux__ && !__ANDROID__ 397 // Darwin (macOS and iOS) __APPLE__ 398 // Akaros (http://akaros.org) __ros__ 399 // Windows _WIN32 400 // NaCL __native_client__ 401 // AsmJS __asmjs__ 402 // WebAssembly (Emscripten) __EMSCRIPTEN__ 403 // Fuchsia __Fuchsia__ 404 // 405 // Note that since Android defines both __ANDROID__ and __linux__, one 406 // may probe for either Linux or Android by simply testing for __linux__. 407 408 // ABSL_HAVE_MMAP 409 // 410 // Checks whether the platform has an mmap(2) implementation as defined in 411 // POSIX.1-2001. 412 #ifdef ABSL_HAVE_MMAP 413 #error ABSL_HAVE_MMAP cannot be directly set 414 #elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \ 415 defined(_AIX) || defined(__ros__) || defined(__native_client__) || \ 416 defined(__asmjs__) || defined(__EMSCRIPTEN__) || defined(__Fuchsia__) || \ 417 defined(__sun) || defined(__ASYLO__) || defined(__myriad2__) || \ 418 defined(__HAIKU__) || defined(__OpenBSD__) || defined(__NetBSD__) || \ 419 defined(__QNX__) || defined(__VXWORKS__) || defined(__hexagon__) 420 #define ABSL_HAVE_MMAP 1 421 #endif 422 423 // ABSL_HAVE_PTHREAD_GETSCHEDPARAM 424 // 425 // Checks whether the platform implements the pthread_(get|set)schedparam(3) 426 // functions as defined in POSIX.1-2001. 427 #ifdef ABSL_HAVE_PTHREAD_GETSCHEDPARAM 428 #error ABSL_HAVE_PTHREAD_GETSCHEDPARAM cannot be directly set 429 #elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \ 430 defined(_AIX) || defined(__ros__) || defined(__OpenBSD__) || \ 431 defined(__NetBSD__) || defined(__VXWORKS__) 432 #define ABSL_HAVE_PTHREAD_GETSCHEDPARAM 1 433 #endif 434 435 // ABSL_HAVE_SCHED_GETCPU 436 // 437 // Checks whether sched_getcpu is available. 438 #ifdef ABSL_HAVE_SCHED_GETCPU 439 #error ABSL_HAVE_SCHED_GETCPU cannot be directly set 440 #elif defined(__linux__) 441 #define ABSL_HAVE_SCHED_GETCPU 1 442 #endif 443 444 // ABSL_HAVE_SCHED_YIELD 445 // 446 // Checks whether the platform implements sched_yield(2) as defined in 447 // POSIX.1-2001. 448 #ifdef ABSL_HAVE_SCHED_YIELD 449 #error ABSL_HAVE_SCHED_YIELD cannot be directly set 450 #elif defined(__linux__) || defined(__ros__) || defined(__native_client__) || \ 451 defined(__VXWORKS__) 452 #define ABSL_HAVE_SCHED_YIELD 1 453 #endif 454 455 // ABSL_HAVE_SEMAPHORE_H 456 // 457 // Checks whether the platform supports the <semaphore.h> header and sem_init(3) 458 // family of functions as standardized in POSIX.1-2001. 459 // 460 // Note: While Apple provides <semaphore.h> for both iOS and macOS, it is 461 // explicitly deprecated and will cause build failures if enabled for those 462 // platforms. We side-step the issue by not defining it here for Apple 463 // platforms. 464 #ifdef ABSL_HAVE_SEMAPHORE_H 465 #error ABSL_HAVE_SEMAPHORE_H cannot be directly set 466 #elif defined(__linux__) || defined(__ros__) || defined(__VXWORKS__) 467 #define ABSL_HAVE_SEMAPHORE_H 1 468 #endif 469 470 // ABSL_HAVE_ALARM 471 // 472 // Checks whether the platform supports the <signal.h> header and alarm(2) 473 // function as standardized in POSIX.1-2001. 474 #ifdef ABSL_HAVE_ALARM 475 #error ABSL_HAVE_ALARM cannot be directly set 476 #elif defined(__GOOGLE_GRTE_VERSION__) 477 // feature tests for Google's GRTE 478 #define ABSL_HAVE_ALARM 1 479 #elif defined(__GLIBC__) 480 // feature test for glibc 481 #define ABSL_HAVE_ALARM 1 482 #elif defined(_MSC_VER) 483 // feature tests for Microsoft's library 484 #elif defined(__MINGW32__) 485 // mingw32 doesn't provide alarm(2): 486 // https://osdn.net/projects/mingw/scm/git/mingw-org-wsl/blobs/5.2-trunk/mingwrt/include/unistd.h 487 // mingw-w64 provides a no-op implementation: 488 // https://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-crt/misc/alarm.c 489 #elif defined(__EMSCRIPTEN__) 490 // emscripten doesn't support signals 491 #elif defined(__wasi__) 492 // WASI doesn't support signals 493 #elif defined(__Fuchsia__) 494 // Signals don't exist on fuchsia. 495 #elif defined(__native_client__) 496 // Signals don't exist on hexagon/QuRT 497 #elif defined(__hexagon__) 498 #else 499 // other standard libraries 500 #define ABSL_HAVE_ALARM 1 501 #endif 502 503 // ABSL_IS_LITTLE_ENDIAN 504 // ABSL_IS_BIG_ENDIAN 505 // 506 // Checks the endianness of the platform. 507 // 508 // Notes: uses the built in endian macros provided by GCC (since 4.6) and 509 // Clang (since 3.2); see 510 // https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html. 511 // Otherwise, if _WIN32, assume little endian. Otherwise, bail with an error. 512 #if defined(ABSL_IS_BIG_ENDIAN) 513 #error "ABSL_IS_BIG_ENDIAN cannot be directly set." 514 #endif 515 #if defined(ABSL_IS_LITTLE_ENDIAN) 516 #error "ABSL_IS_LITTLE_ENDIAN cannot be directly set." 517 #endif 518 519 #if (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \ 520 __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) 521 #define ABSL_IS_LITTLE_ENDIAN 1 522 #elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \ 523 __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 524 #define ABSL_IS_BIG_ENDIAN 1 525 #elif defined(_WIN32) 526 #define ABSL_IS_LITTLE_ENDIAN 1 527 #else 528 #error "absl endian detection needs to be set up for your compiler" 529 #endif 530 531 // macOS < 10.13 and iOS < 12 don't support <any>, <optional>, or <variant> 532 // because the libc++ shared library shipped on the system doesn't have the 533 // requisite exported symbols. See 534 // https://github.com/abseil/abseil-cpp/issues/207 and 535 // https://developer.apple.com/documentation/xcode_release_notes/xcode_10_release_notes 536 // 537 // libc++ spells out the availability requirements in the file 538 // llvm-project/libcxx/include/__config via the #define 539 // _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS. The set of versions has been 540 // modified a few times, via 541 // https://github.com/llvm/llvm-project/commit/7fb40e1569dd66292b647f4501b85517e9247953 542 // and 543 // https://github.com/llvm/llvm-project/commit/0bc451e7e137c4ccadcd3377250874f641ca514a 544 // The second has the actually correct versions, thus, is what we copy here. 545 #if defined(__APPLE__) && \ 546 ((defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ 547 __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101300) || \ 548 (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && \ 549 __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 120000) || \ 550 (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && \ 551 __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000) || \ 552 (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && \ 553 __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 120000)) 554 #define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 1 555 #else 556 #define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 0 557 #endif 558 559 // ABSL_HAVE_STD_ANY 560 // 561 // Checks whether C++17 std::any is available. 562 #ifdef ABSL_HAVE_STD_ANY 563 #error "ABSL_HAVE_STD_ANY cannot be directly set." 564 #elif defined(__cpp_lib_any) && __cpp_lib_any >= 201606L 565 #define ABSL_HAVE_STD_ANY 1 566 #elif defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \ 567 ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L && \ 568 !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 569 #define ABSL_HAVE_STD_ANY 1 570 #endif 571 572 // ABSL_HAVE_STD_OPTIONAL 573 // 574 // Checks whether C++17 std::optional is available. 575 #ifdef ABSL_HAVE_STD_OPTIONAL 576 #error "ABSL_HAVE_STD_OPTIONAL cannot be directly set." 577 #elif defined(__cpp_lib_optional) && __cpp_lib_optional >= 202106L 578 #define ABSL_HAVE_STD_OPTIONAL 1 579 #elif defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \ 580 ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L && \ 581 !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 582 #define ABSL_HAVE_STD_OPTIONAL 1 583 #endif 584 585 // ABSL_HAVE_STD_VARIANT 586 // 587 // Checks whether C++17 std::variant is available. 588 #ifdef ABSL_HAVE_STD_VARIANT 589 #error "ABSL_HAVE_STD_VARIANT cannot be directly set." 590 #elif defined(__cpp_lib_variant) && __cpp_lib_variant >= 201606L 591 #define ABSL_HAVE_STD_VARIANT 1 592 #elif defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \ 593 ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L && \ 594 !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 595 #define ABSL_HAVE_STD_VARIANT 1 596 #endif 597 598 // ABSL_HAVE_STD_STRING_VIEW 599 // 600 // Checks whether C++17 std::string_view is available. 601 #ifdef ABSL_HAVE_STD_STRING_VIEW 602 #error "ABSL_HAVE_STD_STRING_VIEW cannot be directly set." 603 #elif defined(__cpp_lib_string_view) && __cpp_lib_string_view >= 201606L 604 #define ABSL_HAVE_STD_STRING_VIEW 1 605 #elif defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \ 606 ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L 607 #define ABSL_HAVE_STD_STRING_VIEW 1 608 #endif 609 610 // ABSL_HAVE_STD_ORDERING 611 // 612 // Checks whether C++20 std::{partial,weak,strong}_ordering are available. 613 // 614 // __cpp_lib_three_way_comparison is missing on libc++ 615 // (https://github.com/llvm/llvm-project/issues/73953) so treat it as defined 616 // when building in C++20 mode. 617 #ifdef ABSL_HAVE_STD_ORDERING 618 #error "ABSL_HAVE_STD_ORDERING cannot be directly set." 619 #elif (defined(__cpp_lib_three_way_comparison) && \ 620 __cpp_lib_three_way_comparison >= 201907L) || \ 621 (defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \ 622 ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L) 623 #define ABSL_HAVE_STD_ORDERING 1 624 #endif 625 626 // ABSL_USES_STD_ANY 627 // 628 // Indicates whether absl::any is an alias for std::any. 629 #if !defined(ABSL_OPTION_USE_STD_ANY) 630 #error options.h is misconfigured. 631 #elif ABSL_OPTION_USE_STD_ANY == 0 || \ 632 (ABSL_OPTION_USE_STD_ANY == 2 && !defined(ABSL_HAVE_STD_ANY)) 633 #undef ABSL_USES_STD_ANY 634 #elif ABSL_OPTION_USE_STD_ANY == 1 || \ 635 (ABSL_OPTION_USE_STD_ANY == 2 && defined(ABSL_HAVE_STD_ANY)) 636 #define ABSL_USES_STD_ANY 1 637 #else 638 #error options.h is misconfigured. 639 #endif 640 641 // ABSL_USES_STD_OPTIONAL 642 // 643 // Indicates whether absl::optional is an alias for std::optional. 644 #if !defined(ABSL_OPTION_USE_STD_OPTIONAL) 645 #error options.h is misconfigured. 646 #elif ABSL_OPTION_USE_STD_OPTIONAL == 0 || \ 647 (ABSL_OPTION_USE_STD_OPTIONAL == 2 && !defined(ABSL_HAVE_STD_OPTIONAL)) 648 #undef ABSL_USES_STD_OPTIONAL 649 #elif ABSL_OPTION_USE_STD_OPTIONAL == 1 || \ 650 (ABSL_OPTION_USE_STD_OPTIONAL == 2 && defined(ABSL_HAVE_STD_OPTIONAL)) 651 #define ABSL_USES_STD_OPTIONAL 1 652 #else 653 #error options.h is misconfigured. 654 #endif 655 656 // ABSL_USES_STD_VARIANT 657 // 658 // Indicates whether absl::variant is an alias for std::variant. 659 #if !defined(ABSL_OPTION_USE_STD_VARIANT) 660 #error options.h is misconfigured. 661 #elif ABSL_OPTION_USE_STD_VARIANT == 0 || \ 662 (ABSL_OPTION_USE_STD_VARIANT == 2 && !defined(ABSL_HAVE_STD_VARIANT)) 663 #undef ABSL_USES_STD_VARIANT 664 #elif ABSL_OPTION_USE_STD_VARIANT == 1 || \ 665 (ABSL_OPTION_USE_STD_VARIANT == 2 && defined(ABSL_HAVE_STD_VARIANT)) 666 #define ABSL_USES_STD_VARIANT 1 667 #else 668 #error options.h is misconfigured. 669 #endif 670 671 // ABSL_USES_STD_STRING_VIEW 672 // 673 // Indicates whether absl::string_view is an alias for std::string_view. 674 #if !defined(ABSL_OPTION_USE_STD_STRING_VIEW) 675 #error options.h is misconfigured. 676 #elif ABSL_OPTION_USE_STD_STRING_VIEW == 0 || \ 677 (ABSL_OPTION_USE_STD_STRING_VIEW == 2 && \ 678 !defined(ABSL_HAVE_STD_STRING_VIEW)) 679 #undef ABSL_USES_STD_STRING_VIEW 680 #elif ABSL_OPTION_USE_STD_STRING_VIEW == 1 || \ 681 (ABSL_OPTION_USE_STD_STRING_VIEW == 2 && \ 682 defined(ABSL_HAVE_STD_STRING_VIEW)) 683 #define ABSL_USES_STD_STRING_VIEW 1 684 #else 685 #error options.h is misconfigured. 686 #endif 687 688 // ABSL_USES_STD_ORDERING 689 // 690 // Indicates whether absl::{partial,weak,strong}_ordering are aliases for the 691 // std:: ordering types. 692 #if !defined(ABSL_OPTION_USE_STD_ORDERING) 693 #error options.h is misconfigured. 694 #elif ABSL_OPTION_USE_STD_ORDERING == 0 || \ 695 (ABSL_OPTION_USE_STD_ORDERING == 2 && !defined(ABSL_HAVE_STD_ORDERING)) 696 #undef ABSL_USES_STD_ORDERING 697 #elif ABSL_OPTION_USE_STD_ORDERING == 1 || \ 698 (ABSL_OPTION_USE_STD_ORDERING == 2 && defined(ABSL_HAVE_STD_ORDERING)) 699 #define ABSL_USES_STD_ORDERING 1 700 #else 701 #error options.h is misconfigured. 702 #endif 703 704 // In debug mode, MSVC 2017's std::variant throws a EXCEPTION_ACCESS_VIOLATION 705 // SEH exception from emplace for variant<SomeStruct> when constructing the 706 // struct can throw. This defeats some of variant_test and 707 // variant_exception_safety_test. 708 #if defined(_MSC_VER) && _MSC_VER >= 1700 && defined(_DEBUG) 709 #define ABSL_INTERNAL_MSVC_2017_DBG_MODE 710 #endif 711 712 // ABSL_INTERNAL_MANGLED_NS 713 // ABSL_INTERNAL_MANGLED_BACKREFERENCE 714 // 715 // Internal macros for building up mangled names in our internal fork of CCTZ. 716 // This implementation detail is only needed and provided for the MSVC build. 717 // 718 // These macros both expand to string literals. ABSL_INTERNAL_MANGLED_NS is 719 // the mangled spelling of the `absl` namespace, and 720 // ABSL_INTERNAL_MANGLED_BACKREFERENCE is a back-reference integer representing 721 // the proper count to skip past the CCTZ fork namespace names. (This number 722 // is one larger when there is an inline namespace name to skip.) 723 #if defined(_MSC_VER) 724 #if ABSL_OPTION_USE_INLINE_NAMESPACE == 0 725 #define ABSL_INTERNAL_MANGLED_NS "absl" 726 #define ABSL_INTERNAL_MANGLED_BACKREFERENCE "5" 727 #else 728 #define ABSL_INTERNAL_MANGLED_NS \ 729 ABSL_INTERNAL_TOKEN_STR(ABSL_OPTION_INLINE_NAMESPACE_NAME) "@absl" 730 #define ABSL_INTERNAL_MANGLED_BACKREFERENCE "6" 731 #endif 732 #endif 733 734 // ABSL_DLL 735 // 736 // When building Abseil as a DLL, this macro expands to `__declspec(dllexport)` 737 // so we can annotate symbols appropriately as being exported. When used in 738 // headers consuming a DLL, this macro expands to `__declspec(dllimport)` so 739 // that consumers know the symbol is defined inside the DLL. In all other cases, 740 // the macro expands to nothing. 741 #if defined(_MSC_VER) 742 #if defined(ABSL_BUILD_DLL) 743 #define ABSL_DLL __declspec(dllexport) 744 #elif defined(ABSL_CONSUME_DLL) 745 #define ABSL_DLL __declspec(dllimport) 746 #else 747 #define ABSL_DLL 748 #endif 749 #else 750 #define ABSL_DLL 751 #endif // defined(_MSC_VER) 752 753 #if defined(_MSC_VER) 754 #if defined(ABSL_BUILD_TEST_DLL) 755 #define ABSL_TEST_DLL __declspec(dllexport) 756 #elif defined(ABSL_CONSUME_TEST_DLL) 757 #define ABSL_TEST_DLL __declspec(dllimport) 758 #else 759 #define ABSL_TEST_DLL 760 #endif 761 #else 762 #define ABSL_TEST_DLL 763 #endif // defined(_MSC_VER) 764 765 // ABSL_HAVE_MEMORY_SANITIZER 766 // 767 // MemorySanitizer (MSan) is a detector of uninitialized reads. It consists of 768 // a compiler instrumentation module and a run-time library. 769 #ifdef ABSL_HAVE_MEMORY_SANITIZER 770 #error "ABSL_HAVE_MEMORY_SANITIZER cannot be directly set." 771 #elif !defined(__native_client__) && ABSL_HAVE_FEATURE(memory_sanitizer) 772 #define ABSL_HAVE_MEMORY_SANITIZER 1 773 #endif 774 775 // ABSL_HAVE_THREAD_SANITIZER 776 // 777 // ThreadSanitizer (TSan) is a fast data race detector. 778 #ifdef ABSL_HAVE_THREAD_SANITIZER 779 #error "ABSL_HAVE_THREAD_SANITIZER cannot be directly set." 780 #elif defined(__SANITIZE_THREAD__) 781 #define ABSL_HAVE_THREAD_SANITIZER 1 782 #elif ABSL_HAVE_FEATURE(thread_sanitizer) 783 #define ABSL_HAVE_THREAD_SANITIZER 1 784 #endif 785 786 // ABSL_HAVE_ADDRESS_SANITIZER 787 // 788 // AddressSanitizer (ASan) is a fast memory error detector. 789 #ifdef ABSL_HAVE_ADDRESS_SANITIZER 790 #error "ABSL_HAVE_ADDRESS_SANITIZER cannot be directly set." 791 #elif defined(__SANITIZE_ADDRESS__) 792 #define ABSL_HAVE_ADDRESS_SANITIZER 1 793 #elif ABSL_HAVE_FEATURE(address_sanitizer) 794 #define ABSL_HAVE_ADDRESS_SANITIZER 1 795 #endif 796 797 // ABSL_HAVE_HWADDRESS_SANITIZER 798 // 799 // Hardware-Assisted AddressSanitizer (or HWASAN) is even faster than asan 800 // memory error detector which can use CPU features like ARM TBI, Intel LAM or 801 // AMD UAI. 802 #ifdef ABSL_HAVE_HWADDRESS_SANITIZER 803 #error "ABSL_HAVE_HWADDRESS_SANITIZER cannot be directly set." 804 #elif defined(__SANITIZE_HWADDRESS__) 805 #define ABSL_HAVE_HWADDRESS_SANITIZER 1 806 #elif ABSL_HAVE_FEATURE(hwaddress_sanitizer) 807 #define ABSL_HAVE_HWADDRESS_SANITIZER 1 808 #endif 809 810 // ABSL_HAVE_DATAFLOW_SANITIZER 811 // 812 // Dataflow Sanitizer (or DFSAN) is a generalised dynamic data flow analysis. 813 #ifdef ABSL_HAVE_DATAFLOW_SANITIZER 814 #error "ABSL_HAVE_DATAFLOW_SANITIZER cannot be directly set." 815 #elif defined(DATAFLOW_SANITIZER) 816 // GCC provides no method for detecting the presence of the standalone 817 // DataFlowSanitizer (-fsanitize=dataflow), so GCC users of -fsanitize=dataflow 818 // should also use -DDATAFLOW_SANITIZER. 819 #define ABSL_HAVE_DATAFLOW_SANITIZER 1 820 #elif ABSL_HAVE_FEATURE(dataflow_sanitizer) 821 #define ABSL_HAVE_DATAFLOW_SANITIZER 1 822 #endif 823 824 // ABSL_HAVE_LEAK_SANITIZER 825 // 826 // LeakSanitizer (or lsan) is a detector of memory leaks. 827 // https://clang.llvm.org/docs/LeakSanitizer.html 828 // https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer 829 // 830 // The macro ABSL_HAVE_LEAK_SANITIZER can be used to detect at compile-time 831 // whether the LeakSanitizer is potentially available. However, just because the 832 // LeakSanitizer is available does not mean it is active. Use the 833 // always-available run-time interface in //absl/debugging/leak_check.h for 834 // interacting with LeakSanitizer. 835 #ifdef ABSL_HAVE_LEAK_SANITIZER 836 #error "ABSL_HAVE_LEAK_SANITIZER cannot be directly set." 837 #elif defined(LEAK_SANITIZER) 838 // GCC provides no method for detecting the presence of the standalone 839 // LeakSanitizer (-fsanitize=leak), so GCC users of -fsanitize=leak should also 840 // use -DLEAK_SANITIZER. 841 #define ABSL_HAVE_LEAK_SANITIZER 1 842 // Clang standalone LeakSanitizer (-fsanitize=leak) 843 #elif ABSL_HAVE_FEATURE(leak_sanitizer) 844 #define ABSL_HAVE_LEAK_SANITIZER 1 845 #elif defined(ABSL_HAVE_ADDRESS_SANITIZER) 846 // GCC or Clang using the LeakSanitizer integrated into AddressSanitizer. 847 #define ABSL_HAVE_LEAK_SANITIZER 1 848 #endif 849 850 // ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION 851 // 852 // Class template argument deduction is a language feature added in C++17. 853 #ifdef ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION 854 #error "ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION cannot be directly set." 855 #elif defined(__cpp_deduction_guides) 856 #define ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION 1 857 #endif 858 859 // ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL 860 // 861 // Prior to C++17, static constexpr variables defined in classes required a 862 // separate definition outside of the class body, for example: 863 // 864 // class Foo { 865 // static constexpr int kBar = 0; 866 // }; 867 // constexpr int Foo::kBar; 868 // 869 // In C++17, these variables defined in classes are considered inline variables, 870 // and the extra declaration is redundant. Since some compilers warn on the 871 // extra declarations, ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL can be used 872 // conditionally ignore them: 873 // 874 // #ifdef ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL 875 // constexpr int Foo::kBar; 876 // #endif 877 #if defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \ 878 ABSL_INTERNAL_CPLUSPLUS_LANG < 201703L 879 #define ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL 1 880 #endif 881 882 // `ABSL_INTERNAL_HAS_RTTI` determines whether abseil is being compiled with 883 // RTTI support. 884 #ifdef ABSL_INTERNAL_HAS_RTTI 885 #error ABSL_INTERNAL_HAS_RTTI cannot be directly set 886 #elif ABSL_HAVE_FEATURE(cxx_rtti) 887 #define ABSL_INTERNAL_HAS_RTTI 1 888 #elif defined(__GNUC__) && defined(__GXX_RTTI) 889 #define ABSL_INTERNAL_HAS_RTTI 1 890 #elif defined(_MSC_VER) && defined(_CPPRTTI) 891 #define ABSL_INTERNAL_HAS_RTTI 1 892 #elif !defined(__GNUC__) && !defined(_MSC_VER) 893 // Unknown compiler, default to RTTI 894 #define ABSL_INTERNAL_HAS_RTTI 1 895 #endif 896 897 // `ABSL_INTERNAL_HAS_CXA_DEMANGLE` determines whether `abi::__cxa_demangle` is 898 // available. 899 #ifdef ABSL_INTERNAL_HAS_CXA_DEMANGLE 900 #error ABSL_INTERNAL_HAS_CXA_DEMANGLE cannot be directly set 901 #elif defined(OS_ANDROID) && (defined(__i386__) || defined(__x86_64__)) 902 #define ABSL_INTERNAL_HAS_CXA_DEMANGLE 0 903 #elif defined(__GNUC__) && !defined(__mips__) 904 #define ABSL_INTERNAL_HAS_CXA_DEMANGLE 1 905 #elif defined(__clang__) && !defined(_MSC_VER) 906 #define ABSL_INTERNAL_HAS_CXA_DEMANGLE 1 907 #endif 908 909 // ABSL_INTERNAL_HAVE_SSE is used for compile-time detection of SSE support. 910 // See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for an overview of 911 // which architectures support the various x86 instruction sets. 912 #ifdef ABSL_INTERNAL_HAVE_SSE 913 #error ABSL_INTERNAL_HAVE_SSE cannot be directly set 914 #elif defined(__SSE__) 915 #define ABSL_INTERNAL_HAVE_SSE 1 916 #elif (defined(_M_X64) || (defined(_M_IX86_FP) && _M_IX86_FP >= 1)) && \ 917 !defined(_M_ARM64EC) 918 // MSVC only defines _M_IX86_FP for x86 32-bit code, and _M_IX86_FP >= 1 919 // indicates that at least SSE was targeted with the /arch:SSE option. 920 // All x86-64 processors support SSE, so support can be assumed. 921 // https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros 922 #define ABSL_INTERNAL_HAVE_SSE 1 923 #endif 924 925 // ABSL_INTERNAL_HAVE_SSE2 is used for compile-time detection of SSE2 support. 926 // See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for an overview of 927 // which architectures support the various x86 instruction sets. 928 #ifdef ABSL_INTERNAL_HAVE_SSE2 929 #error ABSL_INTERNAL_HAVE_SSE2 cannot be directly set 930 #elif defined(__SSE2__) 931 #define ABSL_INTERNAL_HAVE_SSE2 1 932 #elif (defined(_M_X64) || (defined(_M_IX86_FP) && _M_IX86_FP >= 2)) && \ 933 !defined(_M_ARM64EC) 934 // MSVC only defines _M_IX86_FP for x86 32-bit code, and _M_IX86_FP >= 2 935 // indicates that at least SSE2 was targeted with the /arch:SSE2 option. 936 // All x86-64 processors support SSE2, so support can be assumed. 937 // https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros 938 #define ABSL_INTERNAL_HAVE_SSE2 1 939 #endif 940 941 // ABSL_INTERNAL_HAVE_SSSE3 is used for compile-time detection of SSSE3 support. 942 // See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for an overview of 943 // which architectures support the various x86 instruction sets. 944 // 945 // MSVC does not have a mode that targets SSSE3 at compile-time. To use SSSE3 946 // with MSVC requires either assuming that the code will only every run on CPUs 947 // that support SSSE3, otherwise __cpuid() can be used to detect support at 948 // runtime and fallback to a non-SSSE3 implementation when SSSE3 is unsupported 949 // by the CPU. 950 #ifdef ABSL_INTERNAL_HAVE_SSSE3 951 #error ABSL_INTERNAL_HAVE_SSSE3 cannot be directly set 952 #elif defined(__SSSE3__) 953 #define ABSL_INTERNAL_HAVE_SSSE3 1 954 #endif 955 956 // ABSL_INTERNAL_HAVE_ARM_NEON is used for compile-time detection of NEON (ARM 957 // SIMD). 958 // 959 // If __CUDA_ARCH__ is defined, then we are compiling CUDA code in device mode. 960 // In device mode, NEON intrinsics are not available, regardless of host 961 // platform. 962 // https://llvm.org/docs/CompileCudaWithLLVM.html#detecting-clang-vs-nvcc-from-code 963 #ifdef ABSL_INTERNAL_HAVE_ARM_NEON 964 #error ABSL_INTERNAL_HAVE_ARM_NEON cannot be directly set 965 #elif defined(__ARM_NEON) && !defined(__CUDA_ARCH__) 966 #define ABSL_INTERNAL_HAVE_ARM_NEON 1 967 #endif 968 969 // ABSL_HAVE_CONSTANT_EVALUATED is used for compile-time detection of 970 // constant evaluation support through `absl::is_constant_evaluated`. 971 #ifdef ABSL_HAVE_CONSTANT_EVALUATED 972 #error ABSL_HAVE_CONSTANT_EVALUATED cannot be directly set 973 #endif 974 #ifdef __cpp_lib_is_constant_evaluated 975 #define ABSL_HAVE_CONSTANT_EVALUATED 1 976 #elif ABSL_HAVE_BUILTIN(__builtin_is_constant_evaluated) 977 #define ABSL_HAVE_CONSTANT_EVALUATED 1 978 #endif 979 980 // ABSL_INTERNAL_EMSCRIPTEN_VERSION combines Emscripten's three version macros 981 // into an integer that can be compared against. 982 #ifdef ABSL_INTERNAL_EMSCRIPTEN_VERSION 983 #error ABSL_INTERNAL_EMSCRIPTEN_VERSION cannot be directly set 984 #endif 985 #ifdef __EMSCRIPTEN__ 986 #include <emscripten/version.h> 987 #ifdef __EMSCRIPTEN_major__ 988 #if __EMSCRIPTEN_minor__ >= 1000 989 #error __EMSCRIPTEN_minor__ is too big to fit in ABSL_INTERNAL_EMSCRIPTEN_VERSION 990 #endif 991 #if __EMSCRIPTEN_tiny__ >= 1000 992 #error __EMSCRIPTEN_tiny__ is too big to fit in ABSL_INTERNAL_EMSCRIPTEN_VERSION 993 #endif 994 #define ABSL_INTERNAL_EMSCRIPTEN_VERSION \ 995 ((__EMSCRIPTEN_major__) * 1000000 + (__EMSCRIPTEN_minor__) * 1000 + \ 996 (__EMSCRIPTEN_tiny__)) 997 #endif 998 #endif 999 1000 #endif // ABSL_BASE_CONFIG_H_ 1001