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#define ABSL_LTS_RELEASE_VERSION 20250127
121#define ABSL_LTS_RELEASE_PATCH_LEVEL 1
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
162static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != '\0',
163 "options.h misconfigured: ABSL_OPTION_INLINE_NAMESPACE_NAME must "
164 "not be empty.");
165static_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 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(__clang__) || defined(_GLIBCXX_HAVE_TLS))
239#define ABSL_HAVE_TLS 1
240#endif
241
242// ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
243//
244// Checks whether `std::is_trivially_destructible<T>` is supported.
245#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
246#error ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE cannot be directly set
247#define ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 1
248#endif
249
250// ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
251//
252// Checks whether `std::is_trivially_default_constructible<T>` and
253// `std::is_trivially_copy_constructible<T>` are supported.
254#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
255#error ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE cannot be directly set
256#else
257#define ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE 1
258#endif
259
260// ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
261//
262// Checks whether `std::is_trivially_copy_assignable<T>` is supported.
263#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
264#error ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE cannot be directly set
265#else
266#define ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 1
267#endif
268
269// ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE
270//
271// Checks whether `std::is_trivially_copyable<T>` is supported.
272#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE
273#error ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE cannot be directly set
274#define ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE 1
275#endif
276
277
278// ABSL_HAVE_THREAD_LOCAL
279//
280// DEPRECATED - `thread_local` is available on all supported platforms.
281// Checks whether C++11's `thread_local` storage duration specifier is
282// supported.
283#ifdef ABSL_HAVE_THREAD_LOCAL
284#error ABSL_HAVE_THREAD_LOCAL cannot be directly set
285#else
286#define ABSL_HAVE_THREAD_LOCAL 1
287#endif
288
289// ABSL_HAVE_INTRINSIC_INT128
290//
291// Checks whether the __int128 compiler extension for a 128-bit integral type is
292// supported.
293//
294// Note: __SIZEOF_INT128__ is defined by Clang and GCC when __int128 is
295// supported, but we avoid using it in certain cases:
296// * On Clang:
297// * Building using Clang for Windows, where the Clang runtime library has
298// 128-bit support only on LP64 architectures, but Windows is LLP64.
299// * On Nvidia's nvcc:
300// * nvcc also defines __GNUC__ and __SIZEOF_INT128__, but not all versions
301// actually support __int128.
302#ifdef ABSL_HAVE_INTRINSIC_INT128
303#error ABSL_HAVE_INTRINSIC_INT128 cannot be directly set
304#elif defined(__SIZEOF_INT128__)
305#if (defined(__clang__) && !defined(_WIN32)) || \
306 (defined(__CUDACC__) && __CUDACC_VER_MAJOR__ >= 9) || \
307 (defined(__GNUC__) && !defined(__clang__) && !defined(__CUDACC__))
308#define ABSL_HAVE_INTRINSIC_INT128 1
309#elif defined(__CUDACC__)
310// __CUDACC_VER__ is a full version number before CUDA 9, and is defined to a
311// string explaining that it has been removed starting with CUDA 9. We use
312// nested #ifs because there is no short-circuiting in the preprocessor.
313// NOTE: `__CUDACC__` could be undefined while `__CUDACC_VER__` is defined.
314#if __CUDACC_VER__ >= 70000
315#define ABSL_HAVE_INTRINSIC_INT128 1
316#endif // __CUDACC_VER__ >= 70000
317#endif // defined(__CUDACC__)
318#endif // ABSL_HAVE_INTRINSIC_INT128
319
320// ABSL_HAVE_EXCEPTIONS
321//
322// Checks whether the compiler both supports and enables exceptions. Many
323// compilers support a "no exceptions" mode that disables exceptions.
324//
325// Generally, when ABSL_HAVE_EXCEPTIONS is not defined:
326//
327// * Code using `throw` and `try` may not compile.
328// * The `noexcept` specifier will still compile and behave as normal.
329// * The `noexcept` operator may still return `false`.
330//
331// For further details, consult the compiler's documentation.
332#ifdef ABSL_HAVE_EXCEPTIONS
333#error ABSL_HAVE_EXCEPTIONS cannot be directly set.
334#elif ABSL_INTERNAL_HAVE_MIN_CLANG_VERSION(3, 6)
335// Clang >= 3.6
336#if ABSL_HAVE_FEATURE(cxx_exceptions)
337#define ABSL_HAVE_EXCEPTIONS 1
338#endif // ABSL_HAVE_FEATURE(cxx_exceptions)
339#elif defined(__clang__)
340// Clang < 3.6
341// http://releases.llvm.org/3.6.0/tools/clang/docs/ReleaseNotes.html#the-exceptions-macro
342#if defined(__EXCEPTIONS) && ABSL_HAVE_FEATURE(cxx_exceptions)
343#define ABSL_HAVE_EXCEPTIONS 1
344#endif // defined(__EXCEPTIONS) && ABSL_HAVE_FEATURE(cxx_exceptions)
345// Handle remaining special cases and default to exceptions being supported.
346#elif !(defined(__GNUC__) && !defined(__cpp_exceptions)) && \
347 !(defined(_MSC_VER) && !defined(_CPPUNWIND))
348#define ABSL_HAVE_EXCEPTIONS 1
349#endif
350
351// -----------------------------------------------------------------------------
352// Platform Feature Checks
353// -----------------------------------------------------------------------------
354
355// Currently supported operating systems and associated preprocessor
356// symbols:
357//
358// Linux and Linux-derived __linux__
359// Android __ANDROID__ (implies __linux__)
360// Linux (non-Android) __linux__ && !__ANDROID__
361// Darwin (macOS and iOS) __APPLE__
362// Akaros (http://akaros.org) __ros__
363// Windows _WIN32
364// NaCL __native_client__
365// AsmJS __asmjs__
366// WebAssembly (Emscripten) __EMSCRIPTEN__
367// Fuchsia __Fuchsia__
368//
369// Note that since Android defines both __ANDROID__ and __linux__, one
370// may probe for either Linux or Android by simply testing for __linux__.
371
372// ABSL_HAVE_MMAP
373//
374// Checks whether the platform has an mmap(2) implementation as defined in
375// POSIX.1-2001.
376#ifdef ABSL_HAVE_MMAP
377#error ABSL_HAVE_MMAP cannot be directly set
378#elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
379 defined(_AIX) || defined(__ros__) || defined(__native_client__) || \
380 defined(__asmjs__) || defined(__EMSCRIPTEN__) || defined(__Fuchsia__) || \
381 defined(__sun) || defined(__myriad2__) || defined(__HAIKU__) || \
382 defined(__OpenBSD__) || defined(__NetBSD__) || defined(__QNX__) || \
383 defined(__VXWORKS__) || defined(__hexagon__) || defined(__XTENSA__)
384#define ABSL_HAVE_MMAP 1
385#endif
386
387// ABSL_HAVE_PTHREAD_GETSCHEDPARAM
388//
389// Checks whether the platform implements the pthread_(get|set)schedparam(3)
390// functions as defined in POSIX.1-2001.
391#ifdef ABSL_HAVE_PTHREAD_GETSCHEDPARAM
392#error ABSL_HAVE_PTHREAD_GETSCHEDPARAM cannot be directly set
393#elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
394 defined(_AIX) || defined(__ros__) || defined(__OpenBSD__) || \
395 defined(__NetBSD__) || defined(__VXWORKS__)
396#define ABSL_HAVE_PTHREAD_GETSCHEDPARAM 1
397#endif
398
399// ABSL_HAVE_SCHED_GETCPU
400//
401// Checks whether sched_getcpu is available.
402#ifdef ABSL_HAVE_SCHED_GETCPU
403#error ABSL_HAVE_SCHED_GETCPU cannot be directly set
404#elif defined(__linux__)
405#define ABSL_HAVE_SCHED_GETCPU 1
406#endif
407
408// ABSL_HAVE_SCHED_YIELD
409//
410// Checks whether the platform implements sched_yield(2) as defined in
411// POSIX.1-2001.
412#ifdef ABSL_HAVE_SCHED_YIELD
413#error ABSL_HAVE_SCHED_YIELD cannot be directly set
414#elif defined(__linux__) || defined(__ros__) || defined(__native_client__) || \
415 defined(__VXWORKS__)
416#define ABSL_HAVE_SCHED_YIELD 1
417#endif
418
419// ABSL_HAVE_SEMAPHORE_H
420//
421// Checks whether the platform supports the <semaphore.h> header and sem_init(3)
422// family of functions as standardized in POSIX.1-2001.
423//
424// Note: While Apple provides <semaphore.h> for both iOS and macOS, it is
425// explicitly deprecated and will cause build failures if enabled for those
426// platforms. We side-step the issue by not defining it here for Apple
427// platforms.
428#ifdef ABSL_HAVE_SEMAPHORE_H
429#error ABSL_HAVE_SEMAPHORE_H cannot be directly set
430#elif defined(__linux__) || defined(__ros__) || defined(__VXWORKS__)
431#define ABSL_HAVE_SEMAPHORE_H 1
432#endif
433
434// ABSL_HAVE_ALARM
435//
436// Checks whether the platform supports the <signal.h> header and alarm(2)
437// function as standardized in POSIX.1-2001.
438#ifdef ABSL_HAVE_ALARM
439#error ABSL_HAVE_ALARM cannot be directly set
440#elif defined(__GOOGLE_GRTE_VERSION__)
441// feature tests for Google's GRTE
442#define ABSL_HAVE_ALARM 1
443#elif defined(__GLIBC__)
444// feature test for glibc
445#define ABSL_HAVE_ALARM 1
446#elif defined(_MSC_VER)
447// feature tests for Microsoft's library
448#elif defined(__MINGW32__)
449// mingw32 doesn't provide alarm(2):
450// https://osdn.net/projects/mingw/scm/git/mingw-org-wsl/blobs/5.2-trunk/mingwrt/include/unistd.h
451// mingw-w64 provides a no-op implementation:
452// https://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-crt/misc/alarm.c
453#elif defined(__EMSCRIPTEN__)
454// emscripten doesn't support signals
455#elif defined(__wasi__)
456// WASI doesn't support signals
457#elif defined(__Fuchsia__)
458// Signals don't exist on fuchsia.
459#elif defined(__native_client__)
460// Signals don't exist on hexagon/QuRT
461#elif defined(__hexagon__)
462#else
463// other standard libraries
464#define ABSL_HAVE_ALARM 1
465#endif
466
467// ABSL_IS_LITTLE_ENDIAN
468// ABSL_IS_BIG_ENDIAN
469//
470// Checks the endianness of the platform.
471//
472// Notes: uses the built in endian macros provided by GCC (since 4.6) and
473// Clang (since 3.2); see
474// https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html.
475// Otherwise, if _WIN32, assume little endian. Otherwise, bail with an error.
476#if defined(ABSL_IS_BIG_ENDIAN)
477#error "ABSL_IS_BIG_ENDIAN cannot be directly set."
478#endif
479#if defined(ABSL_IS_LITTLE_ENDIAN)
480#error "ABSL_IS_LITTLE_ENDIAN cannot be directly set."
481#endif
482
483#if (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \
484 __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
485#define ABSL_IS_LITTLE_ENDIAN 1
486#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
487 __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
488#define ABSL_IS_BIG_ENDIAN 1
489#elif defined(_WIN32)
490#define ABSL_IS_LITTLE_ENDIAN 1
491#else
492#error "absl endian detection needs to be set up for your compiler"
493#endif
494
495// macOS < 10.13 and iOS < 12 don't support <any>, <optional>, or <variant>
496// because the libc++ shared library shipped on the system doesn't have the
497// requisite exported symbols. See
498// https://github.com/abseil/abseil-cpp/issues/207 and
499// https://developer.apple.com/documentation/xcode_release_notes/xcode_10_release_notes
500//
501// libc++ spells out the availability requirements in the file
502// llvm-project/libcxx/include/__config via the #define
503// _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS. The set of versions has been
504// modified a few times, via
505// https://github.com/llvm/llvm-project/commit/7fb40e1569dd66292b647f4501b85517e9247953
506// and
507// https://github.com/llvm/llvm-project/commit/0bc451e7e137c4ccadcd3377250874f641ca514a
508// The second has the actually correct versions, thus, is what we copy here.
509#if defined(__APPLE__) && \
510 ((defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \
511 __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101300) || \
512 (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && \
513 __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 120000) || \
514 (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && \
515 __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000) || \
516 (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && \
517 __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 120000))
518#define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 1
519#else
520#define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 0
521#endif
522
523// ABSL_HAVE_STD_ANY
524//
525// Checks whether C++17 std::any is available.
526#ifdef ABSL_HAVE_STD_ANY
527#error "ABSL_HAVE_STD_ANY cannot be directly set."
528#elif defined(__cpp_lib_any) && __cpp_lib_any >= 201606L
529#define ABSL_HAVE_STD_ANY 1
530#elif defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
531 ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L && \
532 !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE
533#define ABSL_HAVE_STD_ANY 1
534#endif
535
536// ABSL_HAVE_STD_OPTIONAL
537//
538// Checks whether C++17 std::optional is available.
539#ifdef ABSL_HAVE_STD_OPTIONAL
540#error "ABSL_HAVE_STD_OPTIONAL cannot be directly set."
541#elif defined(__cpp_lib_optional) && __cpp_lib_optional >= 202106L
542#define ABSL_HAVE_STD_OPTIONAL 1
543#elif defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
544 ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L && \
545 !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE
546#define ABSL_HAVE_STD_OPTIONAL 1
547#endif
548
549// ABSL_HAVE_STD_VARIANT
550//
551// Checks whether C++17 std::variant is available.
552#ifdef ABSL_HAVE_STD_VARIANT
553#error "ABSL_HAVE_STD_VARIANT cannot be directly set."
554#elif defined(__cpp_lib_variant) && __cpp_lib_variant >= 201606L
555#define ABSL_HAVE_STD_VARIANT 1
556#elif defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
557 ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L && \
558 !ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE
559#define ABSL_HAVE_STD_VARIANT 1
560#endif
561
562// ABSL_HAVE_STD_STRING_VIEW
563//
564// Checks whether C++17 std::string_view is available.
565#ifdef ABSL_HAVE_STD_STRING_VIEW
566#error "ABSL_HAVE_STD_STRING_VIEW cannot be directly set."
567#elif defined(__cpp_lib_string_view) && __cpp_lib_string_view >= 201606L
568#define ABSL_HAVE_STD_STRING_VIEW 1
569#elif defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
570 ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L
571#define ABSL_HAVE_STD_STRING_VIEW 1
572#endif
573
574// ABSL_HAVE_STD_ORDERING
575//
576// Checks whether C++20 std::{partial,weak,strong}_ordering are available.
577//
578// __cpp_lib_three_way_comparison is missing on libc++
579// (https://github.com/llvm/llvm-project/issues/73953) so treat it as defined
580// when building in C++20 mode.
581#ifdef ABSL_HAVE_STD_ORDERING
582#error "ABSL_HAVE_STD_ORDERING cannot be directly set."
583#elif (defined(__cpp_lib_three_way_comparison) && \
584 __cpp_lib_three_way_comparison >= 201907L) || \
585 (defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
586 ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L)
587#define ABSL_HAVE_STD_ORDERING 1
588#endif
589
590// ABSL_USES_STD_ANY
591//
592// Indicates whether absl::any is an alias for std::any.
593#if !defined(ABSL_OPTION_USE_STD_ANY)
594#error options.h is misconfigured.
595#elif ABSL_OPTION_USE_STD_ANY == 0 || \
596 (ABSL_OPTION_USE_STD_ANY == 2 && !defined(ABSL_HAVE_STD_ANY))
597#undef ABSL_USES_STD_ANY
598#elif ABSL_OPTION_USE_STD_ANY == 1 || \
599 (ABSL_OPTION_USE_STD_ANY == 2 && defined(ABSL_HAVE_STD_ANY))
600#define ABSL_USES_STD_ANY 1
601#else
602#error options.h is misconfigured.
603#endif
604
605// ABSL_USES_STD_OPTIONAL
606//
607// Indicates whether absl::optional is an alias for std::optional.
608#if !defined(ABSL_OPTION_USE_STD_OPTIONAL)
609#error options.h is misconfigured.
610#elif ABSL_OPTION_USE_STD_OPTIONAL == 0 || \
611 (ABSL_OPTION_USE_STD_OPTIONAL == 2 && !defined(ABSL_HAVE_STD_OPTIONAL))
612#undef ABSL_USES_STD_OPTIONAL
613#elif ABSL_OPTION_USE_STD_OPTIONAL == 1 || \
614 (ABSL_OPTION_USE_STD_OPTIONAL == 2 && defined(ABSL_HAVE_STD_OPTIONAL))
615#define ABSL_USES_STD_OPTIONAL 1
616#else
617#error options.h is misconfigured.
618#endif
619
620// ABSL_USES_STD_VARIANT
621//
622// Indicates whether absl::variant is an alias for std::variant.
623#if !defined(ABSL_OPTION_USE_STD_VARIANT)
624#error options.h is misconfigured.
625#elif ABSL_OPTION_USE_STD_VARIANT == 0 || \
626 (ABSL_OPTION_USE_STD_VARIANT == 2 && !defined(ABSL_HAVE_STD_VARIANT))
627#undef ABSL_USES_STD_VARIANT
628#elif ABSL_OPTION_USE_STD_VARIANT == 1 || \
629 (ABSL_OPTION_USE_STD_VARIANT == 2 && defined(ABSL_HAVE_STD_VARIANT))
630#define ABSL_USES_STD_VARIANT 1
631#else
632#error options.h is misconfigured.
633#endif
634
635// ABSL_USES_STD_STRING_VIEW
636//
637// Indicates whether absl::string_view is an alias for std::string_view.
638#if !defined(ABSL_OPTION_USE_STD_STRING_VIEW)
639#error options.h is misconfigured.
640#elif ABSL_OPTION_USE_STD_STRING_VIEW == 0 || \
641 (ABSL_OPTION_USE_STD_STRING_VIEW == 2 && \
642 !defined(ABSL_HAVE_STD_STRING_VIEW))
643#undef ABSL_USES_STD_STRING_VIEW
644#elif ABSL_OPTION_USE_STD_STRING_VIEW == 1 || \
645 (ABSL_OPTION_USE_STD_STRING_VIEW == 2 && \
646 defined(ABSL_HAVE_STD_STRING_VIEW))
647#define ABSL_USES_STD_STRING_VIEW 1
648#else
649#error options.h is misconfigured.
650#endif
651
652// ABSL_USES_STD_ORDERING
653//
654// Indicates whether absl::{partial,weak,strong}_ordering are aliases for the
655// std:: ordering types.
656#if !defined(ABSL_OPTION_USE_STD_ORDERING)
657#error options.h is misconfigured.
658#elif ABSL_OPTION_USE_STD_ORDERING == 0 || \
659 (ABSL_OPTION_USE_STD_ORDERING == 2 && !defined(ABSL_HAVE_STD_ORDERING))
660#undef ABSL_USES_STD_ORDERING
661#elif ABSL_OPTION_USE_STD_ORDERING == 1 || \
662 (ABSL_OPTION_USE_STD_ORDERING == 2 && defined(ABSL_HAVE_STD_ORDERING))
663#define ABSL_USES_STD_ORDERING 1
664#else
665#error options.h is misconfigured.
666#endif
667
668// In debug mode, MSVC 2017's std::variant throws a EXCEPTION_ACCESS_VIOLATION
669// SEH exception from emplace for variant<SomeStruct> when constructing the
670// struct can throw. This defeats some of variant_test and
671// variant_exception_safety_test.
672#if defined(_MSC_VER) && _MSC_VER >= 1700 && defined(_DEBUG)
673#define ABSL_INTERNAL_MSVC_2017_DBG_MODE
674#endif
675
676// ABSL_INTERNAL_MANGLED_NS
677// ABSL_INTERNAL_MANGLED_BACKREFERENCE
678//
679// Internal macros for building up mangled names in our internal fork of CCTZ.
680// This implementation detail is only needed and provided for the MSVC build.
681//
682// These macros both expand to string literals. ABSL_INTERNAL_MANGLED_NS is
683// the mangled spelling of the `absl` namespace, and
684// ABSL_INTERNAL_MANGLED_BACKREFERENCE is a back-reference integer representing
685// the proper count to skip past the CCTZ fork namespace names. (This number
686// is one larger when there is an inline namespace name to skip.)
687#if defined(_MSC_VER)
688#if ABSL_OPTION_USE_INLINE_NAMESPACE == 0
689#define ABSL_INTERNAL_MANGLED_NS "absl"
690#define ABSL_INTERNAL_MANGLED_BACKREFERENCE "5"
691#else
692#define ABSL_INTERNAL_MANGLED_NS \
693 ABSL_INTERNAL_TOKEN_STR(ABSL_OPTION_INLINE_NAMESPACE_NAME) "@absl"
694#define ABSL_INTERNAL_MANGLED_BACKREFERENCE "6"
695#endif
696#endif
697
698// ABSL_DLL
699//
700// When building Abseil as a DLL, this macro expands to `__declspec(dllexport)`
701// so we can annotate symbols appropriately as being exported. When used in
702// headers consuming a DLL, this macro expands to `__declspec(dllimport)` so
703// that consumers know the symbol is defined inside the DLL. In all other cases,
704// the macro expands to nothing.
705#if defined(_MSC_VER)
706#if defined(ABSL_BUILD_DLL)
707#define ABSL_DLL __declspec(dllexport)
708#elif defined(ABSL_CONSUME_DLL)
709#define ABSL_DLL __declspec(dllimport)
710#else
711#define ABSL_DLL
712#endif
713#else
714#define ABSL_DLL
715#endif // defined(_MSC_VER)
716
717#if defined(_MSC_VER)
718#if defined(ABSL_BUILD_TEST_DLL)
719#define ABSL_TEST_DLL __declspec(dllexport)
720#elif defined(ABSL_CONSUME_TEST_DLL)
721#define ABSL_TEST_DLL __declspec(dllimport)
722#else
723#define ABSL_TEST_DLL
724#endif
725#else
726#define ABSL_TEST_DLL
727#endif // defined(_MSC_VER)
728
729// ABSL_HAVE_MEMORY_SANITIZER
730//
731// MemorySanitizer (MSan) is a detector of uninitialized reads. It consists of
732// a compiler instrumentation module and a run-time library.
733#ifdef ABSL_HAVE_MEMORY_SANITIZER
734#error "ABSL_HAVE_MEMORY_SANITIZER cannot be directly set."
735#elif !defined(__native_client__) && ABSL_HAVE_FEATURE(memory_sanitizer)
736#define ABSL_HAVE_MEMORY_SANITIZER 1
737#endif
738
739// ABSL_HAVE_THREAD_SANITIZER
740//
741// ThreadSanitizer (TSan) is a fast data race detector.
742#ifdef ABSL_HAVE_THREAD_SANITIZER
743#error "ABSL_HAVE_THREAD_SANITIZER cannot be directly set."
744#elif defined(__SANITIZE_THREAD__)
745#define ABSL_HAVE_THREAD_SANITIZER 1
746#elif ABSL_HAVE_FEATURE(thread_sanitizer)
747#define ABSL_HAVE_THREAD_SANITIZER 1
748#endif
749
750// ABSL_HAVE_ADDRESS_SANITIZER
751//
752// AddressSanitizer (ASan) is a fast memory error detector.
753#ifdef ABSL_HAVE_ADDRESS_SANITIZER
754#error "ABSL_HAVE_ADDRESS_SANITIZER cannot be directly set."
755#elif defined(__SANITIZE_ADDRESS__)
756#define ABSL_HAVE_ADDRESS_SANITIZER 1
757#elif ABSL_HAVE_FEATURE(address_sanitizer)
758#define ABSL_HAVE_ADDRESS_SANITIZER 1
759#endif
760
761// ABSL_HAVE_HWADDRESS_SANITIZER
762//
763// Hardware-Assisted AddressSanitizer (or HWASAN) is even faster than asan
764// memory error detector which can use CPU features like ARM TBI, Intel LAM or
765// AMD UAI.
766#ifdef ABSL_HAVE_HWADDRESS_SANITIZER
767#error "ABSL_HAVE_HWADDRESS_SANITIZER cannot be directly set."
768#elif defined(__SANITIZE_HWADDRESS__)
769#define ABSL_HAVE_HWADDRESS_SANITIZER 1
770#elif ABSL_HAVE_FEATURE(hwaddress_sanitizer)
771#define ABSL_HAVE_HWADDRESS_SANITIZER 1
772#endif
773
774// ABSL_HAVE_DATAFLOW_SANITIZER
775//
776// Dataflow Sanitizer (or DFSAN) is a generalised dynamic data flow analysis.
777#ifdef ABSL_HAVE_DATAFLOW_SANITIZER
778#error "ABSL_HAVE_DATAFLOW_SANITIZER cannot be directly set."
779#elif defined(DATAFLOW_SANITIZER)
780// GCC provides no method for detecting the presence of the standalone
781// DataFlowSanitizer (-fsanitize=dataflow), so GCC users of -fsanitize=dataflow
782// should also use -DDATAFLOW_SANITIZER.
783#define ABSL_HAVE_DATAFLOW_SANITIZER 1
784#elif ABSL_HAVE_FEATURE(dataflow_sanitizer)
785#define ABSL_HAVE_DATAFLOW_SANITIZER 1
786#endif
787
788// ABSL_HAVE_LEAK_SANITIZER
789//
790// LeakSanitizer (or lsan) is a detector of memory leaks.
791// https://clang.llvm.org/docs/LeakSanitizer.html
792// https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer
793//
794// The macro ABSL_HAVE_LEAK_SANITIZER can be used to detect at compile-time
795// whether the LeakSanitizer is potentially available. However, just because the
796// LeakSanitizer is available does not mean it is active. Use the
797// always-available run-time interface in //absl/debugging/leak_check.h for
798// interacting with LeakSanitizer.
799#ifdef ABSL_HAVE_LEAK_SANITIZER
800#error "ABSL_HAVE_LEAK_SANITIZER cannot be directly set."
801#elif defined(LEAK_SANITIZER)
802// GCC provides no method for detecting the presence of the standalone
803// LeakSanitizer (-fsanitize=leak), so GCC users of -fsanitize=leak should also
804// use -DLEAK_SANITIZER.
805#define ABSL_HAVE_LEAK_SANITIZER 1
806// Clang standalone LeakSanitizer (-fsanitize=leak)
807#elif ABSL_HAVE_FEATURE(leak_sanitizer)
808#define ABSL_HAVE_LEAK_SANITIZER 1
809#elif defined(ABSL_HAVE_ADDRESS_SANITIZER)
810// GCC or Clang using the LeakSanitizer integrated into AddressSanitizer.
811#define ABSL_HAVE_LEAK_SANITIZER 1
812#endif
813
814// ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION
815//
816// Class template argument deduction is a language feature added in C++17.
817#ifdef ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION
818#error "ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION cannot be directly set."
819#elif defined(__cpp_deduction_guides)
820#define ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION 1
821#endif
822
823// ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL
824//
825// Prior to C++17, static constexpr variables defined in classes required a
826// separate definition outside of the class body, for example:
827//
828// class Foo {
829// static constexpr int kBar = 0;
830// };
831// constexpr int Foo::kBar;
832//
833// In C++17, these variables defined in classes are considered inline variables,
834// and the extra declaration is redundant. Since some compilers warn on the
835// extra declarations, ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL can be used
836// conditionally ignore them:
837//
838// #ifdef ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL
839// constexpr int Foo::kBar;
840// #endif
841#if defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
842 ABSL_INTERNAL_CPLUSPLUS_LANG < 201703L
843#define ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL 1
844#endif
845
846// `ABSL_INTERNAL_HAS_RTTI` determines whether abseil is being compiled with
847// RTTI support.
848#ifdef ABSL_INTERNAL_HAS_RTTI
849#error ABSL_INTERNAL_HAS_RTTI cannot be directly set
850#elif ABSL_HAVE_FEATURE(cxx_rtti)
851#define ABSL_INTERNAL_HAS_RTTI 1
852#elif defined(__GNUC__) && defined(__GXX_RTTI)
853#define ABSL_INTERNAL_HAS_RTTI 1
854#elif defined(_MSC_VER) && defined(_CPPRTTI)
855#define ABSL_INTERNAL_HAS_RTTI 1
856#elif !defined(__GNUC__) && !defined(_MSC_VER)
857// Unknown compiler, default to RTTI
858#define ABSL_INTERNAL_HAS_RTTI 1
859#endif
860
861// `ABSL_INTERNAL_HAS_CXA_DEMANGLE` determines whether `abi::__cxa_demangle` is
862// available.
863#ifdef ABSL_INTERNAL_HAS_CXA_DEMANGLE
864#error ABSL_INTERNAL_HAS_CXA_DEMANGLE cannot be directly set
865#elif defined(OS_ANDROID) && (defined(__i386__) || defined(__x86_64__))
866#define ABSL_INTERNAL_HAS_CXA_DEMANGLE 0
867#elif defined(__GNUC__)
868#define ABSL_INTERNAL_HAS_CXA_DEMANGLE 1
869#elif defined(__clang__) && !defined(_MSC_VER)
870#define ABSL_INTERNAL_HAS_CXA_DEMANGLE 1
871#endif
872
873// ABSL_INTERNAL_HAVE_SSE is used for compile-time detection of SSE support.
874// See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for an overview of
875// which architectures support the various x86 instruction sets.
876#ifdef ABSL_INTERNAL_HAVE_SSE
877#error ABSL_INTERNAL_HAVE_SSE cannot be directly set
878#elif defined(__SSE__)
879#define ABSL_INTERNAL_HAVE_SSE 1
880#elif (defined(_M_X64) || (defined(_M_IX86_FP) && _M_IX86_FP >= 1)) && \
881 !defined(_M_ARM64EC)
882// MSVC only defines _M_IX86_FP for x86 32-bit code, and _M_IX86_FP >= 1
883// indicates that at least SSE was targeted with the /arch:SSE option.
884// All x86-64 processors support SSE, so support can be assumed.
885// https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros
886#define ABSL_INTERNAL_HAVE_SSE 1
887#endif
888
889// ABSL_INTERNAL_HAVE_SSE2 is used for compile-time detection of SSE2 support.
890// See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for an overview of
891// which architectures support the various x86 instruction sets.
892#ifdef ABSL_INTERNAL_HAVE_SSE2
893#error ABSL_INTERNAL_HAVE_SSE2 cannot be directly set
894#elif defined(__SSE2__)
895#define ABSL_INTERNAL_HAVE_SSE2 1
896#elif (defined(_M_X64) || (defined(_M_IX86_FP) && _M_IX86_FP >= 2)) && \
897 !defined(_M_ARM64EC)
898// MSVC only defines _M_IX86_FP for x86 32-bit code, and _M_IX86_FP >= 2
899// indicates that at least SSE2 was targeted with the /arch:SSE2 option.
900// All x86-64 processors support SSE2, so support can be assumed.
901// https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros
902#define ABSL_INTERNAL_HAVE_SSE2 1
903#endif
904
905// ABSL_INTERNAL_HAVE_SSSE3 is used for compile-time detection of SSSE3 support.
906// See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for an overview of
907// which architectures support the various x86 instruction sets.
908//
909// MSVC does not have a mode that targets SSSE3 at compile-time. To use SSSE3
910// with MSVC requires either assuming that the code will only every run on CPUs
911// that support SSSE3, otherwise __cpuid() can be used to detect support at
912// runtime and fallback to a non-SSSE3 implementation when SSSE3 is unsupported
913// by the CPU.
914#ifdef ABSL_INTERNAL_HAVE_SSSE3
915#error ABSL_INTERNAL_HAVE_SSSE3 cannot be directly set
916#elif defined(__SSSE3__)
917#define ABSL_INTERNAL_HAVE_SSSE3 1
918#endif
919
920// ABSL_INTERNAL_HAVE_ARM_NEON is used for compile-time detection of NEON (ARM
921// SIMD).
922//
923// If __CUDA_ARCH__ is defined, then we are compiling CUDA code in device mode.
924// In device mode, NEON intrinsics are not available, regardless of host
925// platform.
926// https://llvm.org/docs/CompileCudaWithLLVM.html#detecting-clang-vs-nvcc-from-code
927#ifdef ABSL_INTERNAL_HAVE_ARM_NEON
928#error ABSL_INTERNAL_HAVE_ARM_NEON cannot be directly set
929#elif defined(__ARM_NEON) && !(defined(__NVCC__) && defined(__CUDACC__))
930#define ABSL_INTERNAL_HAVE_ARM_NEON 1
931#endif
932
933// ABSL_HAVE_CONSTANT_EVALUATED is used for compile-time detection of
934// constant evaluation support through `absl::is_constant_evaluated`.
935#ifdef ABSL_HAVE_CONSTANT_EVALUATED
936#error ABSL_HAVE_CONSTANT_EVALUATED cannot be directly set
937#endif
938#ifdef __cpp_lib_is_constant_evaluated
939#define ABSL_HAVE_CONSTANT_EVALUATED 1
940#elif ABSL_HAVE_BUILTIN(__builtin_is_constant_evaluated)
941#define ABSL_HAVE_CONSTANT_EVALUATED 1
942#endif
943
944// ABSL_INTERNAL_CONSTEXPR_SINCE_CXXYY is used to conditionally define constexpr
945// for different C++ versions.
946//
947// These macros are an implementation detail and will be unconditionally removed
948// once the minimum supported C++ version catches up to a given version.
949//
950// For this reason, this symbol is considered INTERNAL and code outside of
951// Abseil must not use it.
952#if defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
953 ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L
954#define ABSL_INTERNAL_CONSTEXPR_SINCE_CXX17 constexpr
955#else
956#define ABSL_INTERNAL_CONSTEXPR_SINCE_CXX17
957#endif
958#if defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
959 ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L
960#define ABSL_INTERNAL_CONSTEXPR_SINCE_CXX20 constexpr
961#else
962#define ABSL_INTERNAL_CONSTEXPR_SINCE_CXX20
963#endif
964
965// ABSL_INTERNAL_EMSCRIPTEN_VERSION combines Emscripten's three version macros
966// into an integer that can be compared against.
967#ifdef ABSL_INTERNAL_EMSCRIPTEN_VERSION
968#error ABSL_INTERNAL_EMSCRIPTEN_VERSION cannot be directly set
969#endif
970#ifdef __EMSCRIPTEN__
971#include <emscripten/version.h>
972#ifdef __EMSCRIPTEN_major__
973#if __EMSCRIPTEN_minor__ >= 1000
974#error __EMSCRIPTEN_minor__ is too big to fit in ABSL_INTERNAL_EMSCRIPTEN_VERSION
975#endif
976#if __EMSCRIPTEN_tiny__ >= 1000
977#error __EMSCRIPTEN_tiny__ is too big to fit in ABSL_INTERNAL_EMSCRIPTEN_VERSION
978#endif
979#define ABSL_INTERNAL_EMSCRIPTEN_VERSION \
980 ((__EMSCRIPTEN_major__) * 1000000 + (__EMSCRIPTEN_minor__) * 1000 + \
981 (__EMSCRIPTEN_tiny__))
982#endif
983#endif
984
985#endif // ABSL_BASE_CONFIG_H_
986