1// Copyright (C) 2022 The Qt Company Ltd.
2// Copyright (C) 2016 Intel Corporation.
3// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
4
5#if 0
6#pragma qt_class(QtCompilerDetection)
7#pragma qt_sync_skip_header_check
8#pragma qt_sync_stop_processing
9#endif
10
11#ifndef QCOMPILERDETECTION_H
12#define QCOMPILERDETECTION_H
13
14#include <QtCore/qprocessordetection.h>
15#include <QtCore/qsystemdetection.h>
16#include <QtCore/qtconfiginclude.h>
17
18/*
19 The compiler, must be one of: (Q_CC_x)
20
21 COVERITY - Coverity cov-scan
22 SYM - Digital Mars C/C++ (used to be Symantec C++)
23 MSVC - Microsoft Visual C/C++, Intel C++ for Windows
24 BOR - Borland/Turbo C++
25 WAT - Watcom C++
26 GNU - GNU C++
27 COMEAU - Comeau C++
28 EDG - Edison Design Group C++
29 OC - CenterLine C++
30 SUN - Forte Developer, or Sun Studio C++
31 MIPS - MIPSpro C++
32 DEC - DEC C++
33 HPACC - HP aC++
34 USLC - SCO OUDK and UDK
35 CDS - Reliant C++
36 KAI - KAI C++
37 INTEL - Intel C++ for Linux, Intel C++ for Windows
38 HIGHC - MetaWare High C/C++
39 PGI - Portland Group C++
40 GHS - Green Hills Optimizing C++ Compilers
41 RVCT - ARM Realview Compiler Suite
42 CLANG - C++ front-end for the LLVM compiler
43
44
45 Should be sorted most to least authoritative.
46*/
47
48#if defined(__COVERITY__)
49# define Q_CC_COVERITY
50# define Q_COMPILER_COMPLAINS_ABOUT_RETURN_AFTER_UNREACHABLE
51#endif
52
53/* Symantec C++ is now Digital Mars */
54#if defined(__DMC__) || defined(__SC__)
55# define Q_CC_SYM
56/* "explicit" semantics implemented in 8.1e but keyword recognized since 7.5 */
57# if defined(__SC__) && __SC__ < 0x750
58# error "Compiler not supported"
59# endif
60
61#elif defined(_MSC_VER)
62# define Q_CC_MSVC (_MSC_VER)
63# define Q_CC_MSVC_NET
64# define Q_CC_MSVC_ONLY Q_CC_MSVC
65# ifdef __clang__
66# undef Q_CC_MSVC_ONLY
67# define Q_CC_CLANG ((__clang_major__ * 100) + __clang_minor__)
68# define Q_CC_CLANG_ONLY Q_CC_CLANG
69# endif
70# define Q_OUTOFLINE_TEMPLATE inline
71# define Q_COMPILER_MANGLES_RETURN_TYPE
72# define Q_COMPILER_MANGLES_ACCESS_SPECIFIER
73# define Q_FUNC_INFO __FUNCSIG__
74# define Q_ASSUME_IMPL(expr) __assume(expr)
75# define Q_UNREACHABLE_IMPL() __assume(0)
76# define Q_DECL_EXPORT __declspec(dllexport)
77# define Q_DECL_IMPORT __declspec(dllimport)
78# if _MSC_VER < 1938 // stdext is deprecated since VS 2022 17.8
79# define QT_MAKE_CHECKED_ARRAY_ITERATOR(x, N) stdext::make_checked_array_iterator(x, size_t(N)) // Since _MSC_VER >= 1500
80# endif
81# define Q_COMPILER_COMPLAINS_ABOUT_RETURN_AFTER_UNREACHABLE
82
83#elif defined(__BORLANDC__) || defined(__TURBOC__)
84# define Q_CC_BOR
85# define Q_INLINE_TEMPLATE
86# if __BORLANDC__ < 0x502
87# error "Compiler not supported"
88# endif
89
90#elif defined(__WATCOMC__)
91# define Q_CC_WAT
92
93/* ARM Realview Compiler Suite
94 RVCT compiler also defines __EDG__ and __GNUC__ (if --gnu flag is given),
95 so check for it before that */
96#elif defined(__ARMCC__) || defined(__CC_ARM)
97# define Q_CC_RVCT
98/* work-around for missing compiler intrinsics */
99# define __is_empty(X) false
100# define __is_pod(X) false
101# define Q_DECL_DEPRECATED __attribute__ ((__deprecated__))
102# ifdef Q_OS_LINUX
103# define Q_DECL_EXPORT __attribute__((visibility("default")))
104# define Q_DECL_IMPORT __attribute__((visibility("default")))
105# define Q_DECL_HIDDEN __attribute__((visibility("hidden")))
106# else
107# define Q_DECL_EXPORT __declspec(dllexport)
108# define Q_DECL_IMPORT __declspec(dllimport)
109# endif
110
111#elif defined(__GNUC__)
112# define Q_CC_GNU (__GNUC__ * 100 + __GNUC_MINOR__)
113# if defined(__MINGW32__)
114# define Q_CC_MINGW
115# endif
116# if defined(__clang__)
117/* Clang also masquerades as GCC */
118# if defined(__apple_build_version__)
119 // The Clang version reported by Apple Clang in __clang_major__
120 // and __clang_minor__ does _not_ reflect the actual upstream
121 // version of the compiler. To allow consumers to use a single
122 // define to verify the Clang version we hard-code the versions
123 // based on the best available info we have about the actual
124 // version: http://en.wikipedia.org/wiki/Xcode#Toolchain_Versions
125# if __apple_build_version__ >= 14030022 // Xcode 14.3
126# define Q_CC_CLANG 1500
127# elif __apple_build_version__ >= 14000029 // Xcode 14.0
128# define Q_CC_CLANG 1400
129# elif __apple_build_version__ >= 13160021 // Xcode 13.3
130# define Q_CC_CLANG 1300
131# elif __apple_build_version__ >= 13000029 // Xcode 13.0
132# define Q_CC_CLANG 1200
133# elif __apple_build_version__ >= 12050022 // Xcode 12.5
134# define Q_CC_CLANG 1110
135# elif __apple_build_version__ >= 12000032 // Xcode 12.0
136# define Q_CC_CLANG 1000
137# elif __apple_build_version__ >= 11030032 // Xcode 11.4
138# define Q_CC_CLANG 900
139# elif __apple_build_version__ >= 11000033 // Xcode 11.0
140# define Q_CC_CLANG 800
141# else
142# error "Unsupported Apple Clang version"
143# endif
144# else
145 // Non-Apple Clang, so we trust the versions reported
146# define Q_CC_CLANG ((__clang_major__ * 100) + __clang_minor__)
147# endif
148# define Q_CC_CLANG_ONLY Q_CC_CLANG
149# if __has_builtin(__builtin_assume)
150# define Q_ASSUME_IMPL(expr) __builtin_assume(expr)
151# else
152# define Q_ASSUME_IMPL(expr) if (expr){} else __builtin_unreachable()
153# endif
154# define Q_UNREACHABLE_IMPL() __builtin_unreachable()
155# if !defined(__has_extension)
156# /* Compatibility with older Clang versions */
157# define __has_extension __has_feature
158# endif
159# if defined(__APPLE__)
160 /* Apple/clang specific features */
161# define Q_DECL_CF_RETURNS_RETAINED __attribute__((cf_returns_retained))
162# ifdef __OBJC__
163# define Q_DECL_NS_RETURNS_AUTORELEASED __attribute__((ns_returns_autoreleased))
164# endif
165# endif
166# ifdef __EMSCRIPTEN__
167# define Q_CC_EMSCRIPTEN
168# endif
169# else
170/* Plain GCC */
171# define Q_CC_GNU_ONLY Q_CC_GNU
172# if Q_CC_GNU >= 405
173# define Q_ASSUME_IMPL(expr) if (expr){} else __builtin_unreachable()
174# define Q_UNREACHABLE_IMPL() __builtin_unreachable()
175# define Q_DECL_DEPRECATED_X(text) __attribute__ ((__deprecated__(text)))
176# endif
177# endif
178
179# ifdef Q_OS_WIN
180# define Q_DECL_EXPORT __declspec(dllexport)
181# define Q_DECL_IMPORT __declspec(dllimport)
182# else
183# define Q_DECL_EXPORT_OVERRIDABLE __attribute__((visibility("default"), weak))
184# ifdef QT_USE_PROTECTED_VISIBILITY
185# define Q_DECL_EXPORT __attribute__((visibility("protected")))
186# else
187# define Q_DECL_EXPORT __attribute__((visibility("default")))
188# endif
189# define Q_DECL_IMPORT __attribute__((visibility("default")))
190# define Q_DECL_HIDDEN __attribute__((visibility("hidden")))
191# endif
192
193# define Q_FUNC_INFO __PRETTY_FUNCTION__
194# define Q_TYPEOF(expr) __typeof__(expr)
195# define Q_DECL_DEPRECATED __attribute__ ((__deprecated__))
196# define Q_DECL_UNUSED __attribute__((__unused__))
197# define Q_LIKELY(expr) __builtin_expect(!!(expr), true)
198# define Q_UNLIKELY(expr) __builtin_expect(!!(expr), false)
199# define Q_NORETURN __attribute__((__noreturn__))
200# define Q_REQUIRED_RESULT __attribute__ ((__warn_unused_result__))
201# define Q_DECL_PURE_FUNCTION __attribute__((pure))
202# define Q_DECL_CONST_FUNCTION __attribute__((const))
203# define Q_DECL_COLD_FUNCTION __attribute__((cold))
204# if !defined(QT_MOC_CPP)
205# define Q_PACKED __attribute__ ((__packed__))
206# ifndef __ARM_EABI__
207# define QT_NO_ARM_EABI
208# endif
209# endif
210# if Q_CC_GNU >= 403 && !defined(Q_CC_CLANG)
211# define Q_ALLOC_SIZE(x) __attribute__((alloc_size(x)))
212# endif
213
214/* IBM compiler versions are a bit messy. There are actually two products:
215 the C product, and the C++ product. The C++ compiler is always packaged
216 with the latest version of the C compiler. Version numbers do not always
217 match. This little table (I'm not sure it's accurate) should be helpful:
218
219 C++ product C product
220
221 C Set 3.1 C Compiler 3.0
222 ... ...
223 C++ Compiler 3.6.6 C Compiler 4.3
224 ... ...
225 Visual Age C++ 4.0 ...
226 ... ...
227 Visual Age C++ 5.0 C Compiler 5.0
228 ... ...
229 Visual Age C++ 6.0 C Compiler 6.0
230
231 Now:
232 __xlC__ is the version of the C compiler in hexadecimal notation
233 is only an approximation of the C++ compiler version
234 __IBMCPP__ is the version of the C++ compiler in decimal notation
235 but it is not defined on older compilers like C Set 3.1 */
236#elif defined(__xlC__)
237# define Q_CC_XLC
238# if __xlC__ < 0x400
239# error "Compiler not supported"
240# elif __xlC__ >= 0x0600
241# define Q_TYPEOF(expr) __typeof__(expr)
242# define Q_PACKED __attribute__((__packed__))
243# endif
244
245/* Older versions of DEC C++ do not define __EDG__ or __EDG - observed
246 on DEC C++ V5.5-004. New versions do define __EDG__ - observed on
247 Compaq C++ V6.3-002.
248 This compiler is different enough from other EDG compilers to handle
249 it separately anyway. */
250#elif defined(__DECCXX) || defined(__DECC)
251# define Q_CC_DEC
252/* Compaq C++ V6 compilers are EDG-based but I'm not sure about older
253 DEC C++ V5 compilers. */
254# if defined(__EDG__)
255# define Q_CC_EDG
256# endif
257/* Compaq has disabled EDG's _BOOL macro and uses _BOOL_EXISTS instead
258 - observed on Compaq C++ V6.3-002.
259 In any case versions prior to Compaq C++ V6.0-005 do not have bool. */
260# if !defined(_BOOL_EXISTS)
261# error "Compiler not supported"
262# endif
263/* Spurious (?) error messages observed on Compaq C++ V6.5-014. */
264/* Apply to all versions prior to Compaq C++ V6.0-000 - observed on
265 DEC C++ V5.5-004. */
266# if __DECCXX_VER < 60060000
267# define Q_BROKEN_TEMPLATE_SPECIALIZATION
268# endif
269/* avoid undefined symbol problems with out-of-line template members */
270# define Q_OUTOFLINE_TEMPLATE inline
271
272/* The Portland Group C++ compiler is based on EDG and does define __EDG__
273 but the C compiler does not */
274#elif defined(__PGI)
275# define Q_CC_PGI
276# if defined(__EDG__)
277# define Q_CC_EDG
278# endif
279
280/* Compilers with EDG front end are similar. To detect them we test:
281 __EDG documented by SGI, observed on MIPSpro 7.3.1.1 and KAI C++ 4.0b
282 __EDG__ documented in EDG online docs, observed on Compaq C++ V6.3-002
283 and PGI C++ 5.2-4 */
284#elif !defined(Q_OS_HPUX) && (defined(__EDG) || defined(__EDG__))
285# define Q_CC_EDG
286/* From the EDG documentation (does not seem to apply to Compaq C++ or GHS C):
287 _BOOL
288 Defined in C++ mode when bool is a keyword. The name of this
289 predefined macro is specified by a configuration flag. _BOOL
290 is the default.
291 __BOOL_DEFINED
292 Defined in Microsoft C++ mode when bool is a keyword. */
293# if !defined(_BOOL) && !defined(__BOOL_DEFINED) && !defined(__ghs)
294# error "Compiler not supported"
295# endif
296
297/* The Comeau compiler is based on EDG and does define __EDG__ */
298# if defined(__COMO__)
299# define Q_CC_COMEAU
300
301/* The `using' keyword was introduced to avoid KAI C++ warnings
302 but it's now causing KAI C++ errors instead. The standard is
303 unclear about the use of this keyword, and in practice every
304 compiler is using its own set of rules. Forget it. */
305# elif defined(__KCC)
306# define Q_CC_KAI
307
308/* Uses CFront, make sure to read the manual how to tweak templates. */
309# elif defined(__ghs)
310# define Q_CC_GHS
311# define Q_DECL_DEPRECATED __attribute__ ((__deprecated__))
312# define Q_PACKED __attribute__ ((__packed__))
313# define Q_FUNC_INFO __PRETTY_FUNCTION__
314# define Q_TYPEOF(expr) __typeof__(expr)
315# define Q_UNREACHABLE_IMPL()
316# if defined(__cplusplus)
317# define Q_COMPILER_AUTO_TYPE
318# define Q_COMPILER_STATIC_ASSERT
319# define Q_COMPILER_RANGE_FOR
320# if __GHS_VERSION_NUMBER >= 201505
321# define Q_COMPILER_ALIGNAS
322# define Q_COMPILER_ALIGNOF
323# define Q_COMPILER_ATOMICS
324# define Q_COMPILER_ATTRIBUTES
325# define Q_COMPILER_AUTO_FUNCTION
326# define Q_COMPILER_CLASS_ENUM
327# define Q_COMPILER_DECLTYPE
328# define Q_COMPILER_DEFAULT_MEMBERS
329# define Q_COMPILER_DELETE_MEMBERS
330# define Q_COMPILER_DELEGATING_CONSTRUCTORS
331# define Q_COMPILER_EXPLICIT_CONVERSIONS
332# define Q_COMPILER_EXPLICIT_OVERRIDES
333# define Q_COMPILER_EXTERN_TEMPLATES
334# define Q_COMPILER_INHERITING_CONSTRUCTORS
335# define Q_COMPILER_INITIALIZER_LISTS
336# define Q_COMPILER_LAMBDA
337# define Q_COMPILER_NONSTATIC_MEMBER_INIT
338# define Q_COMPILER_NOEXCEPT
339# define Q_COMPILER_NULLPTR
340# define Q_COMPILER_RANGE_FOR
341# define Q_COMPILER_RAW_STRINGS
342# define Q_COMPILER_REF_QUALIFIERS
343# define Q_COMPILER_RVALUE_REFS
344# define Q_COMPILER_STATIC_ASSERT
345# define Q_COMPILER_TEMPLATE_ALIAS
346# define Q_COMPILER_THREAD_LOCAL
347# define Q_COMPILER_UDL
348# define Q_COMPILER_UNICODE_STRINGS
349# define Q_COMPILER_UNIFORM_INIT
350# define Q_COMPILER_UNRESTRICTED_UNIONS
351# define Q_COMPILER_VARIADIC_MACROS
352# define Q_COMPILER_VARIADIC_TEMPLATES
353# endif
354# endif //__cplusplus
355
356# elif defined(__DCC__)
357# define Q_CC_DIAB
358# if !defined(__bool)
359# error "Compiler not supported"
360# endif
361
362/* The UnixWare 7 UDK compiler is based on EDG and does define __EDG__ */
363# elif defined(__USLC__) && defined(__SCO_VERSION__)
364# define Q_CC_USLC
365/* The latest UDK 7.1.1b does not need this, but previous versions do */
366# if !defined(__SCO_VERSION__) || (__SCO_VERSION__ < 302200010)
367# define Q_OUTOFLINE_TEMPLATE inline
368# endif
369
370/* Never tested! */
371# elif defined(CENTERLINE_CLPP) || defined(OBJECTCENTER)
372# define Q_CC_OC
373
374/* CDS++ defines __EDG__ although this is not documented in the Reliant
375 documentation. It also follows conventions like _BOOL and this documented */
376# elif defined(sinix)
377# define Q_CC_CDS
378# endif
379
380/* VxWorks' DIAB toolchain has an additional EDG type C++ compiler
381 (see __DCC__ above). This one is for C mode files (__EDG is not defined) */
382#elif defined(_DIAB_TOOL)
383# define Q_CC_DIAB
384# define Q_FUNC_INFO __PRETTY_FUNCTION__
385
386/* Never tested! */
387#elif defined(__HIGHC__)
388# define Q_CC_HIGHC
389
390#elif defined(__SUNPRO_CC) || defined(__SUNPRO_C)
391# define Q_CC_SUN
392# define Q_COMPILER_MANGLES_RETURN_TYPE
393/* 5.0 compiler or better
394 'bool' is enabled by default but can be disabled using -features=nobool
395 in which case _BOOL is not defined
396 this is the default in 4.2 compatibility mode triggered by -compat=4 */
397# if __SUNPRO_CC >= 0x500
398# define QT_NO_TEMPLATE_TEMPLATE_PARAMETERS
399 /* see http://developers.sun.com/sunstudio/support/Ccompare.html */
400# if __SUNPRO_CC >= 0x590
401# define Q_TYPEOF(expr) __typeof__(expr)
402# endif
403# if __SUNPRO_CC >= 0x550
404# define Q_DECL_EXPORT __global
405# endif
406# if !defined(_BOOL)
407# error "Compiler not supported"
408# endif
409/* 4.2 compiler or older */
410# else
411# error "Compiler not supported"
412# endif
413
414/* CDS++ does not seem to define __EDG__ or __EDG according to Reliant
415 documentation but nevertheless uses EDG conventions like _BOOL */
416#elif defined(sinix)
417# define Q_CC_EDG
418# define Q_CC_CDS
419# if !defined(_BOOL)
420# error "Compiler not supported"
421# endif
422# define Q_BROKEN_TEMPLATE_SPECIALIZATION
423
424#else
425# error "Qt has not been tested with this compiler - see http://www.qt-project.org/"
426#endif
427
428/*
429 * SG10's SD-6 feature detection and some useful extensions from Clang and GCC
430 * https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations
431 * http://clang.llvm.org/docs/LanguageExtensions.html#feature-checking-macros
432 * Not using wrapper macros, per http://eel.is/c++draft/cpp.cond#7.sentence-2
433 */
434#ifndef __has_builtin
435# define __has_builtin(x) 0
436#endif
437#ifndef __has_feature
438# define __has_feature(x) 0
439#endif
440#ifndef __has_attribute
441# define __has_attribute(x) 0
442#endif
443#ifndef __has_cpp_attribute
444# define __has_cpp_attribute(x) 0
445#endif
446#ifndef __has_include
447# define __has_include(x) 0
448#endif
449#ifndef __has_include_next
450# define __has_include_next(x) 0
451#endif
452
453/*
454 detecting ASAN can be helpful to disable slow tests
455 clang uses feature, gcc defines __SANITIZE_ADDRESS__
456 unconditionally check both in case other compilers mirror
457 either of those options
458 */
459#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
460# define QT_ASAN_ENABLED
461#endif
462
463/*
464 * C++11 support
465 *
466 * Paper Macro SD-6 macro
467 * N2341 Q_COMPILER_ALIGNAS
468 * N2341 Q_COMPILER_ALIGNOF
469 * N2427 Q_COMPILER_ATOMICS
470 * N2761 Q_COMPILER_ATTRIBUTES __cpp_attributes = 200809
471 * N2541 Q_COMPILER_AUTO_FUNCTION
472 * N1984 N2546 Q_COMPILER_AUTO_TYPE
473 * N2437 Q_COMPILER_CLASS_ENUM
474 * N2235 Q_COMPILER_CONSTEXPR __cpp_constexpr = 200704
475 * N2343 N3276 Q_COMPILER_DECLTYPE __cpp_decltype = 200707
476 * N2346 Q_COMPILER_DEFAULT_MEMBERS
477 * N2346 Q_COMPILER_DELETE_MEMBERS
478 * N1986 Q_COMPILER_DELEGATING_CONSTRUCTORS
479 * N2437 Q_COMPILER_EXPLICIT_CONVERSIONS
480 * N3206 N3272 Q_COMPILER_EXPLICIT_OVERRIDES
481 * N1987 Q_COMPILER_EXTERN_TEMPLATES
482 * N2540 Q_COMPILER_INHERITING_CONSTRUCTORS
483 * N2672 Q_COMPILER_INITIALIZER_LISTS
484 * N2658 N2927 Q_COMPILER_LAMBDA __cpp_lambdas = 200907
485 * N2756 Q_COMPILER_NONSTATIC_MEMBER_INIT
486 * N2855 N3050 Q_COMPILER_NOEXCEPT
487 * N2431 Q_COMPILER_NULLPTR
488 * N2930 Q_COMPILER_RANGE_FOR
489 * N2442 Q_COMPILER_RAW_STRINGS __cpp_raw_strings = 200710
490 * N2439 Q_COMPILER_REF_QUALIFIERS
491 * N2118 N2844 N3053 Q_COMPILER_RVALUE_REFS __cpp_rvalue_references = 200610
492 * N1720 Q_COMPILER_STATIC_ASSERT __cpp_static_assert = 200410
493 * N2258 Q_COMPILER_TEMPLATE_ALIAS
494 * N2659 Q_COMPILER_THREAD_LOCAL
495 * N2660 Q_COMPILER_THREADSAFE_STATICS
496 * N2765 Q_COMPILER_UDL __cpp_user_defined_literals = 200809
497 * N2442 Q_COMPILER_UNICODE_STRINGS __cpp_unicode_literals = 200710
498 * N2640 Q_COMPILER_UNIFORM_INIT
499 * N2544 Q_COMPILER_UNRESTRICTED_UNIONS
500 * N1653 Q_COMPILER_VARIADIC_MACROS
501 * N2242 N2555 Q_COMPILER_VARIADIC_TEMPLATES __cpp_variadic_templates = 200704
502 *
503 *
504 * For the C++ standards C++14 and C++17, we use only the SD-6 macro.
505 *
506 * For any future version of the C++ standard, we use only the C++20 feature test macro.
507 * For library features, we assume <version> is present (this header includes it).
508 *
509 * For a full listing of feature test macros, see
510 * https://en.cppreference.com/w/cpp/feature_test
511 *
512 * C++ extensions:
513 * Q_COMPILER_RESTRICTED_VLA variable-length arrays, prior to __cpp_runtime_arrays
514 */
515
516/*
517 * Now that we require C++17, we unconditionally expect threadsafe statics mandated since C++11
518 */
519#define Q_COMPILER_THREADSAFE_STATICS
520
521#if defined(Q_CC_CLANG)
522/* General C++ features */
523# define Q_COMPILER_RESTRICTED_VLA
524# if __has_feature(attribute_deprecated_with_message)
525# define Q_DECL_DEPRECATED_X(text) __attribute__ ((__deprecated__(text)))
526# endif
527
528// Clang supports binary literals in C, C++98 and C++11 modes
529// It's been supported "since the dawn of time itself" (cf. commit 179883)
530# if __has_extension(cxx_binary_literals)
531# define Q_COMPILER_BINARY_LITERALS
532# endif
533
534// Variadic macros are supported for gnu++98, c++11, c99 ... since 2.9
535# if Q_CC_CLANG >= 209
536# if !defined(__STRICT_ANSI__) || defined(__GXX_EXPERIMENTAL_CXX0X__) \
537 || (defined(__cplusplus) && (__cplusplus >= 201103L)) \
538 || (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L))
539# define Q_COMPILER_VARIADIC_MACROS
540# endif
541# endif
542
543/* C++11 features, see http://clang.llvm.org/cxx_status.html */
544# if (defined(__cplusplus) && __cplusplus >= 201103L) \
545 || defined(__GXX_EXPERIMENTAL_CXX0X__)
546 /* Detect C++ features using __has_feature(), see http://clang.llvm.org/docs/LanguageExtensions.html#cxx11 */
547# if __has_feature(cxx_alignas)
548# define Q_COMPILER_ALIGNAS
549# define Q_COMPILER_ALIGNOF
550# endif
551# if __has_feature(cxx_atomic) && __has_include(<atomic>)
552# define Q_COMPILER_ATOMICS
553# endif
554# if __has_feature(cxx_attributes)
555# define Q_COMPILER_ATTRIBUTES
556# endif
557# if __has_feature(cxx_auto_type)
558# define Q_COMPILER_AUTO_FUNCTION
559# define Q_COMPILER_AUTO_TYPE
560# endif
561# if __has_feature(cxx_strong_enums)
562# define Q_COMPILER_CLASS_ENUM
563# endif
564# if __has_feature(cxx_constexpr) && Q_CC_CLANG > 302 /* CLANG 3.2 has bad/partial support */
565# define Q_COMPILER_CONSTEXPR
566# endif
567# if __has_feature(cxx_decltype) /* && __has_feature(cxx_decltype_incomplete_return_types) */
568# define Q_COMPILER_DECLTYPE
569# endif
570# if __has_feature(cxx_defaulted_functions)
571# define Q_COMPILER_DEFAULT_MEMBERS
572# endif
573# if __has_feature(cxx_deleted_functions)
574# define Q_COMPILER_DELETE_MEMBERS
575# endif
576# if __has_feature(cxx_delegating_constructors)
577# define Q_COMPILER_DELEGATING_CONSTRUCTORS
578# endif
579# if __has_feature(cxx_explicit_conversions)
580# define Q_COMPILER_EXPLICIT_CONVERSIONS
581# endif
582# if __has_feature(cxx_override_control)
583# define Q_COMPILER_EXPLICIT_OVERRIDES
584# endif
585# if __has_feature(cxx_inheriting_constructors)
586# define Q_COMPILER_INHERITING_CONSTRUCTORS
587# endif
588# if __has_feature(cxx_generalized_initializers)
589# define Q_COMPILER_INITIALIZER_LISTS
590# define Q_COMPILER_UNIFORM_INIT /* both covered by this feature macro, according to docs */
591# endif
592# if __has_feature(cxx_lambdas)
593# define Q_COMPILER_LAMBDA
594# endif
595# if __has_feature(cxx_noexcept)
596# define Q_COMPILER_NOEXCEPT
597# endif
598# if __has_feature(cxx_nonstatic_member_init)
599# define Q_COMPILER_NONSTATIC_MEMBER_INIT
600# endif
601# if __has_feature(cxx_nullptr)
602# define Q_COMPILER_NULLPTR
603# endif
604# if __has_feature(cxx_range_for)
605# define Q_COMPILER_RANGE_FOR
606# endif
607# if __has_feature(cxx_raw_string_literals)
608# define Q_COMPILER_RAW_STRINGS
609# endif
610# if __has_feature(cxx_reference_qualified_functions)
611# define Q_COMPILER_REF_QUALIFIERS
612# endif
613# if __has_feature(cxx_rvalue_references)
614# define Q_COMPILER_RVALUE_REFS
615# endif
616# if __has_feature(cxx_static_assert)
617# define Q_COMPILER_STATIC_ASSERT
618# endif
619# if __has_feature(cxx_alias_templates)
620# define Q_COMPILER_TEMPLATE_ALIAS
621# endif
622# if __has_feature(cxx_thread_local)
623# if !defined(__FreeBSD__) /* FreeBSD clang fails on __cxa_thread_atexit */
624# define Q_COMPILER_THREAD_LOCAL
625# endif
626# endif
627# if __has_feature(cxx_user_literals)
628# define Q_COMPILER_UDL
629# endif
630# if __has_feature(cxx_unicode_literals)
631# define Q_COMPILER_UNICODE_STRINGS
632# endif
633# if __has_feature(cxx_unrestricted_unions)
634# define Q_COMPILER_UNRESTRICTED_UNIONS
635# endif
636# if __has_feature(cxx_variadic_templates)
637# define Q_COMPILER_VARIADIC_TEMPLATES
638# endif
639 /* Features that have no __has_feature() check */
640# if Q_CC_CLANG >= 209 /* since clang 2.9 */
641# define Q_COMPILER_EXTERN_TEMPLATES
642# endif
643# endif // (defined(__cplusplus) && __cplusplus >= 201103L) || defined(__GXX_EXPERIMENTAL_CXX0X__)
644
645/* C++1y features, deprecated macros. Do not update this list. */
646# if defined(__cplusplus) && __cplusplus > 201103L
647//# if __has_feature(cxx_binary_literals)
648//# define Q_COMPILER_BINARY_LITERALS // see above
649//# endif
650# if __has_feature(cxx_generic_lambda)
651# define Q_COMPILER_GENERIC_LAMBDA
652# endif
653# if __has_feature(cxx_init_capture)
654# define Q_COMPILER_LAMBDA_CAPTURES
655# endif
656# if __has_feature(cxx_relaxed_constexpr)
657# define Q_COMPILER_RELAXED_CONSTEXPR_FUNCTIONS
658# endif
659# if __has_feature(cxx_decltype_auto) && __has_feature(cxx_return_type_deduction)
660# define Q_COMPILER_RETURN_TYPE_DEDUCTION
661# endif
662# if __has_feature(cxx_variable_templates)
663# define Q_COMPILER_VARIABLE_TEMPLATES
664# endif
665# if __has_feature(cxx_runtime_array)
666# define Q_COMPILER_VLA
667# endif
668# endif // if defined(__cplusplus) && __cplusplus > 201103L
669
670# if defined(__STDC_VERSION__)
671# if __has_feature(c_static_assert)
672# define Q_COMPILER_STATIC_ASSERT
673# endif
674# if __has_feature(c_thread_local) && __has_include(<threads.h>)
675# if !defined(__FreeBSD__) /* FreeBSD clang fails on __cxa_thread_atexit */
676# define Q_COMPILER_THREAD_LOCAL
677# endif
678# endif
679# endif
680
681# ifndef Q_DECL_UNUSED
682# define Q_DECL_UNUSED __attribute__((__unused__))
683# endif
684# define Q_DECL_UNUSED_MEMBER Q_DECL_UNUSED
685#endif // defined(Q_CC_CLANG)
686
687#if defined(Q_CC_GNU_ONLY)
688# define Q_COMPILER_RESTRICTED_VLA
689# if Q_CC_GNU >= 403
690// GCC supports binary literals in C, C++98 and C++11 modes
691# define Q_COMPILER_BINARY_LITERALS
692# endif
693# if !defined(__STRICT_ANSI__) || defined(__GXX_EXPERIMENTAL_CXX0X__) \
694 || (defined(__cplusplus) && (__cplusplus >= 201103L)) \
695 || (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L))
696 // Variadic macros are supported for gnu++98, c++11, C99 ... since forever (gcc 2.97)
697# define Q_COMPILER_VARIADIC_MACROS
698# endif
699# if defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L
700# if Q_CC_GNU >= 403
701 /* C++11 features supported in GCC 4.3: */
702# define Q_COMPILER_DECLTYPE
703# define Q_COMPILER_RVALUE_REFS
704# define Q_COMPILER_STATIC_ASSERT
705# endif
706# if Q_CC_GNU >= 404
707 /* C++11 features supported in GCC 4.4: */
708# define Q_COMPILER_AUTO_FUNCTION
709# define Q_COMPILER_AUTO_TYPE
710# define Q_COMPILER_EXTERN_TEMPLATES
711# define Q_COMPILER_UNIFORM_INIT
712# define Q_COMPILER_UNICODE_STRINGS
713# define Q_COMPILER_VARIADIC_TEMPLATES
714# endif
715# if Q_CC_GNU >= 405
716 /* C++11 features supported in GCC 4.5: */
717# define Q_COMPILER_EXPLICIT_CONVERSIONS
718 /* GCC 4.4 implements initializer_list but does not define typedefs required
719 * by the standard. */
720# define Q_COMPILER_INITIALIZER_LISTS
721# define Q_COMPILER_LAMBDA
722# define Q_COMPILER_RAW_STRINGS
723# define Q_COMPILER_CLASS_ENUM
724# endif
725# if Q_CC_GNU >= 406
726 /* Pre-4.6 compilers implement a non-final snapshot of N2346, hence default and delete
727 * functions are supported only if they are public. Starting from 4.6, GCC handles
728 * final version - the access modifier is not relevant. */
729# define Q_COMPILER_DEFAULT_MEMBERS
730# define Q_COMPILER_DELETE_MEMBERS
731 /* C++11 features supported in GCC 4.6: */
732# define Q_COMPILER_NULLPTR
733# define Q_COMPILER_UNRESTRICTED_UNIONS
734# define Q_COMPILER_RANGE_FOR
735# endif
736# if Q_CC_GNU >= 407
737 /* GCC 4.4 implemented <atomic> and std::atomic using its old intrinsics.
738 * However, the implementation is incomplete for most platforms until GCC 4.7:
739 * instead, std::atomic would use an external lock. Since we need an std::atomic
740 * that is behavior-compatible with QBasicAtomic, we only enable it here */
741# define Q_COMPILER_ATOMICS
742 /* GCC 4.6.x has problems dealing with noexcept expressions,
743 * so turn the feature on for 4.7 and above, only */
744# define Q_COMPILER_NOEXCEPT
745 /* C++11 features supported in GCC 4.7: */
746# define Q_COMPILER_NONSTATIC_MEMBER_INIT
747# define Q_COMPILER_DELEGATING_CONSTRUCTORS
748# define Q_COMPILER_EXPLICIT_OVERRIDES
749# define Q_COMPILER_TEMPLATE_ALIAS
750# define Q_COMPILER_UDL
751# endif
752# if Q_CC_GNU >= 408
753# define Q_COMPILER_ATTRIBUTES
754# define Q_COMPILER_ALIGNAS
755# define Q_COMPILER_ALIGNOF
756# define Q_COMPILER_INHERITING_CONSTRUCTORS
757# define Q_COMPILER_THREAD_LOCAL
758# if Q_CC_GNU > 408 || __GNUC_PATCHLEVEL__ >= 1
759# define Q_COMPILER_REF_QUALIFIERS
760# endif
761# endif
762# if Q_CC_GNU >= 500
763 /* GCC 4.6 introduces constexpr, but it's bugged (at least) in the whole
764 * 4.x series, see e.g. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57694 */
765# define Q_COMPILER_CONSTEXPR
766# endif
767# endif
768# if __cplusplus > 201103L
769# if Q_CC_GNU >= 409
770 /* C++1y features in GCC 4.9 - deprecated, do not update this list */
771//# define Q_COMPILER_BINARY_LITERALS // already supported since GCC 4.3 as an extension
772# define Q_COMPILER_LAMBDA_CAPTURES
773# define Q_COMPILER_RETURN_TYPE_DEDUCTION
774# endif
775# endif
776# if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
777# if Q_CC_GNU >= 407
778 /* C11 features supported in GCC 4.7: */
779# define Q_COMPILER_STATIC_ASSERT
780# endif
781# if Q_CC_GNU >= 409 && defined(__has_include)
782 /* C11 features supported in GCC 4.9: */
783# if __has_include(<threads.h>)
784# define Q_COMPILER_THREAD_LOCAL
785# endif
786# endif
787# endif
788#endif
789
790#if defined(Q_CC_MSVC) && !defined(Q_CC_CLANG)
791# if defined(__cplusplus)
792 /* C++11 features supported in VC8 = VC2005: */
793# define Q_COMPILER_VARIADIC_MACROS
794
795 /* 2005 supports the override and final contextual keywords, in
796 the same positions as the C++11 variants, but 'final' is
797 called 'sealed' instead:
798 http://msdn.microsoft.com/en-us/library/0w2w91tf%28v=vs.80%29.aspx
799 The behavior is slightly different in C++/CLI, which requires the
800 "virtual" keyword to be present too, so don't define for that.
801 So don't define Q_COMPILER_EXPLICIT_OVERRIDES (since it's not
802 the same as the C++11 version), but define the Q_DECL_* flags
803 accordingly. */
804 /* C++11 features supported in VC10 = VC2010: */
805# define Q_COMPILER_AUTO_FUNCTION
806# define Q_COMPILER_AUTO_TYPE
807# define Q_COMPILER_DECLTYPE
808# define Q_COMPILER_EXTERN_TEMPLATES
809# define Q_COMPILER_LAMBDA
810# define Q_COMPILER_NULLPTR
811# define Q_COMPILER_RVALUE_REFS
812# define Q_COMPILER_STATIC_ASSERT
813 /* C++11 features supported in VC11 = VC2012: */
814# define Q_COMPILER_EXPLICIT_OVERRIDES /* ...and use std C++11 now */
815# define Q_COMPILER_CLASS_ENUM
816# define Q_COMPILER_ATOMICS
817 /* C++11 features in VC12 = VC2013 */
818# define Q_COMPILER_DELETE_MEMBERS
819# define Q_COMPILER_DELEGATING_CONSTRUCTORS
820# define Q_COMPILER_EXPLICIT_CONVERSIONS
821# define Q_COMPILER_NONSTATIC_MEMBER_INIT
822# define Q_COMPILER_RAW_STRINGS
823# define Q_COMPILER_TEMPLATE_ALIAS
824# define Q_COMPILER_VARIADIC_TEMPLATES
825# define Q_COMPILER_INITIALIZER_LISTS // VC 12 SP 2 RC
826 /* C++11 features in VC14 = VC2015 */
827# define Q_COMPILER_DEFAULT_MEMBERS
828# define Q_COMPILER_ALIGNAS
829# define Q_COMPILER_ALIGNOF
830# define Q_COMPILER_INHERITING_CONSTRUCTORS
831# define Q_COMPILER_NOEXCEPT
832# define Q_COMPILER_RANGE_FOR
833# define Q_COMPILER_REF_QUALIFIERS
834# define Q_COMPILER_THREAD_LOCAL
835# define Q_COMPILER_UDL
836# define Q_COMPILER_UNICODE_STRINGS
837# define Q_COMPILER_UNRESTRICTED_UNIONS
838# if _MSC_FULL_VER >= 190023419
839# define Q_COMPILER_ATTRIBUTES
840// Almost working, see https://connect.microsoft.com/VisualStudio/feedback/details/2011648
841//# define Q_COMPILER_CONSTEXPR
842# define Q_COMPILER_UNIFORM_INIT
843# endif
844# if _MSC_VER >= 1910
845# define Q_COMPILER_CONSTEXPR
846# endif
847// MSVC versions before 19.36 have a bug in C++20 comparison implementation.
848// This leads to ambiguities when resolving comparison operator overloads in
849// certain scenarios (the buggy MSVC versions were checked using our CI and
850// compiler explorer).
851# if _MSC_VER < 1936
852# define Q_COMPILER_LACKS_THREE_WAY_COMPARE_SYMMETRY
853# endif
854// QTBUG-124376: MSVC is slow at compiling qstrnlen()
855# define Q_COMPILER_SLOW_QSTRNLEN_COMPILATION
856# endif /* __cplusplus */
857#endif // defined(Q_CC_MSVC) && !defined(Q_CC_CLANG)
858
859#ifdef Q_COMPILER_UNICODE_STRINGS
860# define Q_STDLIB_UNICODE_STRINGS
861#elif defined(__cplusplus)
862# error "Qt6 requires Unicode string support in both the compiler and the standard library"
863#endif
864
865#ifdef __cplusplus
866# include <utility>
867# if defined(Q_OS_QNX)
868// By default, QNX 7.0 uses libc++ (from LLVM) and
869// QNX 6.X uses Dinkumware's libcpp. In all versions,
870// it is also possible to use GNU libstdc++.
871
872// For Dinkumware, some features must be disabled
873// (mostly because of library problems).
874// Dinkumware is assumed when __GLIBCXX__ (GNU libstdc++)
875// and _LIBCPP_VERSION (LLVM libc++) are both absent.
876# if !defined(__GLIBCXX__) && !defined(_LIBCPP_VERSION)
877
878// Older versions of libcpp (QNX 650) do not support C++11 features
879// _HAS_* macros are set to 1 by toolchains that actually include
880// Dinkum C++11 libcpp.
881
882# if !defined(_HAS_CPP0X) || !_HAS_CPP0X
883// Disable C++11 features that depend on library support
884# undef Q_COMPILER_INITIALIZER_LISTS
885# undef Q_COMPILER_RVALUE_REFS
886# undef Q_COMPILER_REF_QUALIFIERS
887# undef Q_COMPILER_NOEXCEPT
888// Disable C++11 library features:
889# undef Q_STDLIB_UNICODE_STRINGS
890# endif // !_HAS_CPP0X
891# if !defined(_HAS_NULLPTR_T) || !_HAS_NULLPTR_T
892# undef Q_COMPILER_NULLPTR
893# endif //!_HAS_NULLPTR_T
894# if !defined(_HAS_CONSTEXPR) || !_HAS_CONSTEXPR
895// The libcpp is missing constexpr keywords on important functions like std::numeric_limits<>::min()
896// Disable constexpr support on QNX even if the compiler supports it
897# undef Q_COMPILER_CONSTEXPR
898# endif // !_HAS_CONSTEXPR
899# endif // !__GLIBCXX__ && !_LIBCPP_VERSION
900# endif // Q_OS_QNX
901# if defined(Q_CC_CLANG) && defined(Q_OS_DARWIN)
902# if defined(__GNUC_LIBSTD__) && ((__GNUC_LIBSTD__-0) * 100 + __GNUC_LIBSTD_MINOR__-0 <= 402)
903// Apple has not updated libstdc++ since 2007, which means it does not have
904// <initializer_list> or std::move. Let's disable these features
905# undef Q_COMPILER_INITIALIZER_LISTS
906# undef Q_COMPILER_RVALUE_REFS
907# undef Q_COMPILER_REF_QUALIFIERS
908// Also disable <atomic>, since it's clearly not there
909# undef Q_COMPILER_ATOMICS
910# endif
911# if defined(__cpp_lib_memory_resource) \
912 && ((defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED < 140000) \
913 || (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED < 170000))
914# undef __cpp_lib_memory_resource // Only supported on macOS 14 and iOS 17
915# endif
916# endif // defined(Q_CC_CLANG) && defined(Q_OS_DARWIN)
917#endif
918
919// Don't break code that is already using Q_COMPILER_DEFAULT_DELETE_MEMBERS
920#if defined(Q_COMPILER_DEFAULT_MEMBERS) && defined(Q_COMPILER_DELETE_MEMBERS)
921# define Q_COMPILER_DEFAULT_DELETE_MEMBERS
922#endif
923
924/*
925 * Compatibility macros for C++11/14 keywords and expressions.
926 * Don't use in new code and port away whenever you have a chance.
927 */
928#define Q_ALIGNOF(x) alignof(x)
929#define Q_DECL_ALIGN(n) alignas(n)
930#define Q_DECL_NOTHROW Q_DECL_NOEXCEPT
931#ifdef __cplusplus
932# define Q_CONSTEXPR constexpr
933# define Q_DECL_CONSTEXPR constexpr
934# define Q_DECL_EQ_DEFAULT = default
935# define Q_DECL_EQ_DELETE = delete
936# define Q_DECL_FINAL final
937# define Q_DECL_NOEXCEPT noexcept
938# define Q_DECL_NOEXCEPT_EXPR(x) noexcept(x)
939# define Q_DECL_OVERRIDE override
940# define Q_DECL_RELAXED_CONSTEXPR constexpr
941# define Q_NULLPTR nullptr
942# define Q_RELAXED_CONSTEXPR constexpr
943#else
944# define Q_CONSTEXPR const
945# define Q_DECL_CONSTEXPR
946# define Q_DECL_RELAXED_CONSTEXPR
947# define Q_NULLPTR NULL
948# define Q_RELAXED_CONSTEXPR const
949# ifdef Q_CC_GNU
950# define Q_DECL_NOEXCEPT __attribute__((__nothrow__))
951# else
952# define Q_DECL_NOEXCEPT
953# endif
954#endif
955
956#if __has_cpp_attribute(nodiscard) && (!defined(Q_CC_CLANG) || __cplusplus > 201402L) // P0188R1
957// Can't use [[nodiscard]] with Clang and C++11/14, see https://bugs.llvm.org/show_bug.cgi?id=33518
958# undef Q_REQUIRED_RESULT
959# define Q_REQUIRED_RESULT [[nodiscard]]
960#endif
961
962#if __has_cpp_attribute(nodiscard) >= 201907L /* used for both P1771 and P1301... */
963// [[nodiscard]] constructor (P1771)
964# ifndef Q_NODISCARD_CTOR
965# define Q_NODISCARD_CTOR [[nodiscard]]
966# endif
967// [[nodiscard("reason")]] (P1301)
968# ifndef Q_NODISCARD_X
969# define Q_NODISCARD_X(message) [[nodiscard(message)]]
970# endif
971# ifndef Q_NODISCARD_CTOR_X
972# define Q_NODISCARD_CTOR_X(message) [[nodiscard(message)]]
973# endif
974#endif
975
976#if __has_cpp_attribute(maybe_unused)
977# undef Q_DECL_UNUSED
978# define Q_DECL_UNUSED [[maybe_unused]]
979#endif
980
981#if __has_cpp_attribute(noreturn)
982# undef Q_NORETURN
983# define Q_NORETURN [[noreturn]]
984#endif
985
986#if __has_cpp_attribute(deprecated)
987# ifdef Q_DECL_DEPRECATED
988# undef Q_DECL_DEPRECATED
989# endif
990# ifdef Q_DECL_DEPRECATED_X
991# undef Q_DECL_DEPRECATED_X
992# endif
993# define Q_DECL_DEPRECATED [[deprecated]]
994# define Q_DECL_DEPRECATED_X(x) [[deprecated(x)]]
995#endif
996
997#define Q_DECL_ENUMERATOR_DEPRECATED Q_DECL_DEPRECATED
998#define Q_DECL_ENUMERATOR_DEPRECATED_X(x) Q_DECL_DEPRECATED_X(x)
999
1000/*
1001 * Fallback macros to certain compiler features
1002 */
1003
1004#ifndef Q_NORETURN
1005# define Q_NORETURN
1006#endif
1007#ifndef Q_LIKELY
1008# define Q_LIKELY(x) (x)
1009#endif
1010#ifndef Q_UNLIKELY
1011# define Q_UNLIKELY(x) (x)
1012#endif
1013#ifndef Q_ASSUME_IMPL
1014# define Q_ASSUME_IMPL(expr) qt_noop()
1015#endif
1016#ifndef Q_UNREACHABLE_IMPL
1017# define Q_UNREACHABLE_IMPL() qt_noop()
1018#endif
1019#ifndef Q_ALLOC_SIZE
1020# define Q_ALLOC_SIZE(x)
1021#endif
1022#ifndef Q_REQUIRED_RESULT
1023# define Q_REQUIRED_RESULT
1024#endif
1025#ifndef Q_NODISCARD_X
1026# define Q_NODISCARD_X(message) Q_REQUIRED_RESULT
1027#endif
1028#ifndef Q_NODISCARD_CTOR
1029# define Q_NODISCARD_CTOR
1030#endif
1031#ifndef Q_NODISCARD_CTOR_X
1032# define Q_NODISCARD_CTOR_X(message) Q_NODISCARD_CTOR
1033#endif
1034#ifndef Q_DECL_DEPRECATED
1035# define Q_DECL_DEPRECATED
1036#endif
1037#ifndef Q_DECL_VARIABLE_DEPRECATED
1038# define Q_DECL_VARIABLE_DEPRECATED Q_DECL_DEPRECATED
1039#endif
1040#ifndef Q_DECL_DEPRECATED_X
1041# define Q_DECL_DEPRECATED_X(text) Q_DECL_DEPRECATED
1042#endif
1043#ifndef Q_DECL_EXPORT
1044# define Q_DECL_EXPORT
1045#endif
1046#ifndef Q_DECL_EXPORT_OVERRIDABLE
1047# define Q_DECL_EXPORT_OVERRIDABLE Q_DECL_EXPORT
1048#endif
1049#ifndef Q_DECL_IMPORT
1050# define Q_DECL_IMPORT
1051#endif
1052#ifndef Q_DECL_HIDDEN
1053# define Q_DECL_HIDDEN
1054#endif
1055#ifndef Q_DECL_UNUSED
1056# define Q_DECL_UNUSED
1057#endif
1058#ifndef Q_DECL_UNUSED_MEMBER
1059# define Q_DECL_UNUSED_MEMBER
1060#endif
1061#ifndef Q_FUNC_INFO
1062# if defined(Q_OS_SOLARIS) || defined(Q_CC_XLC)
1063# define Q_FUNC_INFO __FILE__ "(line number unavailable)"
1064# else
1065# define Q_FUNC_INFO __FILE__ ":" QT_STRINGIFY(__LINE__)
1066# endif
1067#endif
1068#ifndef Q_DECL_CF_RETURNS_RETAINED
1069# define Q_DECL_CF_RETURNS_RETAINED
1070#endif
1071#ifndef Q_DECL_NS_RETURNS_AUTORELEASED
1072# define Q_DECL_NS_RETURNS_AUTORELEASED
1073#endif
1074#ifndef Q_DECL_PURE_FUNCTION
1075# define Q_DECL_PURE_FUNCTION
1076#endif
1077#ifndef Q_DECL_CONST_FUNCTION
1078# define Q_DECL_CONST_FUNCTION Q_DECL_PURE_FUNCTION
1079#endif
1080#ifndef Q_DECL_COLD_FUNCTION
1081# define Q_DECL_COLD_FUNCTION
1082#endif
1083#ifndef QT_MAKE_UNCHECKED_ARRAY_ITERATOR
1084# define QT_MAKE_UNCHECKED_ARRAY_ITERATOR(x) (x)
1085#endif
1086#ifndef QT_MAKE_CHECKED_ARRAY_ITERATOR
1087# define QT_MAKE_CHECKED_ARRAY_ITERATOR(x, N) (x)
1088#endif
1089
1090/*
1091 * "Weak overloads" - makes an otherwise confliciting overload weaker
1092 * (by making it a template)
1093 */
1094#ifndef Q_QDOC
1095# define Q_WEAK_OVERLOAD template <typename = void>
1096#else
1097# define Q_WEAK_OVERLOAD
1098#endif
1099
1100/*
1101 * If one wants to add functions that use post-C++17 APIs, one needs to:
1102 *
1103 * 1) make them fully inline; and
1104 * 2) guard them using the necessary feature-testing macros.
1105 *
1106 * This decouples the C++ version used to build Qt with the one used by
1107 * end-user applications; Qt and the application can either choose any C++
1108 * version.
1109 *
1110 * A problem arises on MSVC for member functions of exported classes. Client
1111 * code that tries to use such a function will see it as exported, and simply
1112 * try to consume the function's *symbol*. However, if Qt has been built in
1113 * C++17, it won't have such a symbol, and linking will fail.
1114 *
1115 * The workaround: declare such functions as function templates.
1116 * (Obviously a function template does not need this marker.)
1117*/
1118#ifndef Q_QDOC
1119# define QT_POST_CXX17_API_IN_EXPORTED_CLASS template <typename = void>
1120#else
1121# define QT_POST_CXX17_API_IN_EXPORTED_CLASS
1122#endif
1123
1124/*
1125 * Warning/diagnostic handling
1126 */
1127
1128#define QT_DO_PRAGMA(text) _Pragma(#text)
1129#if defined(Q_CC_MSVC) && !defined(Q_CC_CLANG)
1130# undef QT_DO_PRAGMA /* not needed */
1131# define QT_WARNING_PUSH __pragma(warning(push))
1132# define QT_WARNING_POP __pragma(warning(pop))
1133# define QT_WARNING_DISABLE_MSVC(number) __pragma(warning(disable: number))
1134# define QT_WARNING_DISABLE_INTEL(number)
1135# define QT_WARNING_DISABLE_CLANG(text)
1136# define QT_WARNING_DISABLE_GCC(text)
1137# define QT_WARNING_DISABLE_DEPRECATED QT_WARNING_DISABLE_MSVC(4996)
1138# define QT_WARNING_DISABLE_FLOAT_COMPARE
1139# define QT_WARNING_DISABLE_INVALID_OFFSETOF
1140#elif defined(Q_CC_CLANG)
1141# define QT_WARNING_PUSH QT_DO_PRAGMA(clang diagnostic push)
1142# define QT_WARNING_POP QT_DO_PRAGMA(clang diagnostic pop)
1143# define QT_WARNING_DISABLE_CLANG(text) QT_DO_PRAGMA(clang diagnostic ignored text)
1144# define QT_WARNING_DISABLE_GCC(text)
1145# define QT_WARNING_DISABLE_INTEL(number)
1146# define QT_WARNING_DISABLE_MSVC(number)
1147# define QT_WARNING_DISABLE_DEPRECATED QT_WARNING_DISABLE_CLANG("-Wdeprecated-declarations")
1148# define QT_WARNING_DISABLE_FLOAT_COMPARE QT_WARNING_DISABLE_CLANG("-Wfloat-equal")
1149# define QT_WARNING_DISABLE_INVALID_OFFSETOF QT_WARNING_DISABLE_CLANG("-Winvalid-offsetof")
1150#elif defined(Q_CC_GNU) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 406)
1151# define QT_WARNING_PUSH QT_DO_PRAGMA(GCC diagnostic push)
1152# define QT_WARNING_POP QT_DO_PRAGMA(GCC diagnostic pop)
1153# define QT_WARNING_DISABLE_GCC(text) QT_DO_PRAGMA(GCC diagnostic ignored text)
1154# define QT_WARNING_DISABLE_CLANG(text)
1155# define QT_WARNING_DISABLE_INTEL(number)
1156# define QT_WARNING_DISABLE_MSVC(number)
1157# define QT_WARNING_DISABLE_DEPRECATED QT_WARNING_DISABLE_GCC("-Wdeprecated-declarations")
1158# define QT_WARNING_DISABLE_FLOAT_COMPARE QT_WARNING_DISABLE_GCC("-Wfloat-equal")
1159# define QT_WARNING_DISABLE_INVALID_OFFSETOF QT_WARNING_DISABLE_GCC("-Winvalid-offsetof")
1160#else // All other compilers, GCC < 4.6 and MSVC < 2008
1161# define QT_WARNING_DISABLE_GCC(text)
1162# define QT_WARNING_PUSH
1163# define QT_WARNING_POP
1164# define QT_WARNING_DISABLE_INTEL(number)
1165# define QT_WARNING_DISABLE_MSVC(number)
1166# define QT_WARNING_DISABLE_CLANG(text)
1167# define QT_WARNING_DISABLE_GCC(text)
1168# define QT_WARNING_DISABLE_DEPRECATED
1169# define QT_WARNING_DISABLE_FLOAT_COMPARE
1170# define QT_WARNING_DISABLE_INVALID_OFFSETOF
1171#endif
1172
1173#ifndef QT_IGNORE_DEPRECATIONS
1174#define QT_IGNORE_DEPRECATIONS(statement) \
1175 QT_WARNING_PUSH \
1176 QT_WARNING_DISABLE_DEPRECATED \
1177 statement \
1178 QT_WARNING_POP
1179#endif
1180
1181// The body must be a statement:
1182#define Q_CAST_IGNORE_ALIGN(body) QT_WARNING_PUSH QT_WARNING_DISABLE_GCC("-Wcast-align") body QT_WARNING_POP
1183
1184// This macro can be used to calculate member offsets for types with a non standard layout.
1185// It uses the fact that offsetof() is allowed to support those types since C++17 as an optional
1186// feature. All our compilers do support this, but some issue a warning, so we wrap the offsetof()
1187// call in a macro that disables the compiler warning.
1188#define Q_OFFSETOF(Class, member) \
1189 []() -> size_t { \
1190 QT_WARNING_PUSH QT_WARNING_DISABLE_INVALID_OFFSETOF \
1191 return offsetof(Class, member); \
1192 QT_WARNING_POP \
1193 }()
1194
1195/*
1196 Proper for-scoping in MIPSpro CC
1197*/
1198#ifndef QT_NO_KEYWORDS
1199# if defined(Q_CC_MIPS) || (defined(Q_CC_HPACC) && defined(__ia64))
1200# define for if (0) {} else for
1201# endif
1202#endif
1203
1204#ifdef Q_COMPILER_RVALUE_REFS
1205#define qMove(x) std::move(x)
1206#else
1207#define qMove(x) (x)
1208#endif
1209
1210#if defined(__cplusplus)
1211#if __has_cpp_attribute(clang::fallthrough)
1212# define Q_FALLTHROUGH() [[clang::fallthrough]]
1213#elif __has_cpp_attribute(gnu::fallthrough)
1214# define Q_FALLTHROUGH() [[gnu::fallthrough]]
1215#elif __has_cpp_attribute(fallthrough)
1216# define Q_FALLTHROUGH() [[fallthrough]]
1217#endif
1218#endif
1219#ifndef Q_FALLTHROUGH
1220# ifdef Q_CC_GNU
1221# define Q_FALLTHROUGH() __attribute__((fallthrough))
1222# else
1223# define Q_FALLTHROUGH() (void)0
1224# endif
1225#endif
1226
1227#if defined(__has_attribute) && __has_attribute(uninitialized)
1228# define Q_DECL_UNINITIALIZED __attribute__((uninitialized))
1229#else
1230# define Q_DECL_UNINITIALIZED
1231#endif
1232
1233
1234/*
1235 Sanitize compiler feature availability
1236*/
1237#if !defined(Q_PROCESSOR_X86)
1238# undef QT_COMPILER_SUPPORTS_SSE2
1239# undef QT_COMPILER_SUPPORTS_SSE3
1240# undef QT_COMPILER_SUPPORTS_SSSE3
1241# undef QT_COMPILER_SUPPORTS_SSE4_1
1242# undef QT_COMPILER_SUPPORTS_SSE4_2
1243# undef QT_COMPILER_SUPPORTS_AVX
1244# undef QT_COMPILER_SUPPORTS_AVX2
1245# undef QT_COMPILER_SUPPORTS_F16C
1246#endif
1247#if !defined(Q_PROCESSOR_ARM)
1248# undef QT_COMPILER_SUPPORTS_NEON
1249#endif
1250#if !defined(Q_PROCESSOR_MIPS)
1251# undef QT_COMPILER_SUPPORTS_MIPS_DSP
1252# undef QT_COMPILER_SUPPORTS_MIPS_DSPR2
1253#endif
1254
1255// Compiler version check
1256#if defined(__cplusplus) && (__cplusplus < 201703L)
1257# ifdef Q_CC_MSVC
1258# error "Qt requires a C++17 compiler, and a suitable value for __cplusplus. On MSVC, you must pass the /Zc:__cplusplus option to the compiler."
1259# else
1260# error "Qt requires a C++17 compiler"
1261# endif
1262#endif // __cplusplus
1263
1264#if defined(__cplusplus) && defined(Q_CC_MSVC) && !defined(Q_CC_CLANG)
1265# if Q_CC_MSVC < 1927
1266 // Check below only works with 16.7 or newer
1267# error "Qt requires at least Visual Studio 2019 version 16.7 (VC++ version 14.27). Please upgrade."
1268# endif
1269
1270// On MSVC we require /permissive- set by user code. Check that we are
1271// under its rules -- for instance, check that std::nullptr_t->bool is
1272// not an implicit conversion, as per
1273// https://docs.microsoft.com/en-us/cpp/overview/cpp-conformance-improvements?view=msvc-160#nullptr_t-is-only-convertible-to-bool-as-a-direct-initialization
1274static_assert(!std::is_convertible_v<std::nullptr_t, bool>,
1275 "On MSVC you must pass the /permissive- option to the compiler.");
1276#endif
1277
1278#if defined(QT_BOOTSTRAPPED) || defined(QT_USE_PROTECTED_VISIBILITY) || !defined(__ELF__) || defined(__PIC__)
1279// this is fine
1280#elif defined(__PIE__)
1281# error "-fPIE is not sufficient if Qt was configured with the -DFEATURE_reduce_relocations=ON "\
1282 "CMake option. Compile your code with -fPIC and without -fPIE or compile Qt with "\
1283 "-DFEATURE_no_direct_extern_access=ON."
1284#elif defined(QT_REDUCE_RELOCATIONS)
1285# error "You must build your code with position independent code if Qt was configured with the "\
1286 "-DFEATURE_reduce_relocations=ON CMake option. Compile your code with -fPIC and "\
1287 "without -fPIE or compile Qt with -DFEATURE_no_direct_extern_access=ON."
1288#endif
1289
1290#ifdef Q_PROCESSOR_X86_32
1291# if defined(Q_CC_GNU)
1292# define QT_FASTCALL __attribute__((regparm(3)))
1293# elif defined(Q_CC_MSVC)
1294# define QT_FASTCALL __fastcall
1295# else
1296# define QT_FASTCALL
1297# endif
1298#else
1299# define QT_FASTCALL
1300#endif
1301
1302// enable gcc warnings for printf-style functions
1303#if defined(Q_CC_GNU) && !defined(__INSURE__)
1304# if defined(Q_CC_MINGW) && !defined(Q_CC_CLANG)
1305# define Q_ATTRIBUTE_FORMAT_PRINTF(A, B) \
1306 __attribute__((format(gnu_printf, (A), (B))))
1307# else
1308# define Q_ATTRIBUTE_FORMAT_PRINTF(A, B) \
1309 __attribute__((format(printf, (A), (B))))
1310# endif
1311#else
1312# define Q_ATTRIBUTE_FORMAT_PRINTF(A, B)
1313#endif
1314
1315#ifdef Q_CC_MSVC
1316# define Q_NEVER_INLINE __declspec(noinline)
1317# define Q_ALWAYS_INLINE __forceinline
1318#elif defined(Q_CC_GNU)
1319# define Q_NEVER_INLINE __attribute__((noinline))
1320# define Q_ALWAYS_INLINE inline __attribute__((always_inline))
1321#else
1322# define Q_NEVER_INLINE
1323# define Q_ALWAYS_INLINE inline
1324#endif
1325
1326//defines the type for the WNDPROC on windows
1327//the alignment needs to be forced for sse2 to not crash with mingw
1328#if defined(Q_OS_WIN)
1329# if defined(Q_CC_MINGW) && defined(Q_PROCESSOR_X86_32)
1330# define QT_ENSURE_STACK_ALIGNED_FOR_SSE __attribute__ ((force_align_arg_pointer))
1331# else
1332# define QT_ENSURE_STACK_ALIGNED_FOR_SSE
1333# endif
1334# define QT_WIN_CALLBACK CALLBACK QT_ENSURE_STACK_ALIGNED_FOR_SSE
1335#endif
1336
1337#ifdef __cpp_conditional_explicit
1338#define Q_IMPLICIT explicit(false)
1339#else
1340#define Q_IMPLICIT
1341#endif
1342
1343#if defined(__cplusplus)
1344
1345#ifdef __cpp_constinit
1346# if defined(Q_CC_MSVC) && !defined(Q_CC_CLANG)
1347 // https://developercommunity.visualstudio.com/t/C:-constinit-for-an-optional-fails-if-/1406069
1348# define Q_CONSTINIT
1349# else
1350# define Q_CONSTINIT constinit
1351# endif
1352#elif defined(__has_cpp_attribute) && __has_cpp_attribute(clang::require_constant_initialization)
1353# define Q_CONSTINIT [[clang::require_constant_initialization]]
1354#elif defined(Q_CC_GNU_ONLY) && Q_CC_GNU >= 1000
1355# define Q_CONSTINIT __constinit
1356#else
1357# define Q_CONSTINIT
1358#endif
1359
1360#ifndef Q_OUTOFLINE_TEMPLATE
1361# define Q_OUTOFLINE_TEMPLATE
1362#endif
1363#ifndef Q_INLINE_TEMPLATE
1364# define Q_INLINE_TEMPLATE inline
1365#endif
1366
1367/*
1368 Avoid some particularly useless warnings from some stupid compilers.
1369 To get ALL C++ compiler warnings, define QT_CC_WARNINGS or comment out
1370 the line "#define QT_NO_WARNINGS". See also QTBUG-26877.
1371*/
1372#if !defined(QT_CC_WARNINGS)
1373# define QT_NO_WARNINGS
1374#endif
1375#if defined(QT_NO_WARNINGS)
1376# if defined(Q_CC_MSVC)
1377QT_WARNING_DISABLE_MSVC(4251) /* class 'type' needs to have dll-interface to be used by clients of class 'type2' */
1378QT_WARNING_DISABLE_MSVC(4244) /* conversion from 'type1' to 'type2', possible loss of data */
1379QT_WARNING_DISABLE_MSVC(4275) /* non - DLL-interface classkey 'identifier' used as base for DLL-interface classkey 'identifier' */
1380QT_WARNING_DISABLE_MSVC(4514) /* unreferenced inline function has been removed */
1381QT_WARNING_DISABLE_MSVC(4800) /* 'type' : forcing value to bool 'true' or 'false' (performance warning) */
1382QT_WARNING_DISABLE_MSVC(4097) /* typedef-name 'identifier1' used as synonym for class-name 'identifier2' */
1383QT_WARNING_DISABLE_MSVC(4706) /* assignment within conditional expression */
1384QT_WARNING_DISABLE_MSVC(4355) /* 'this' : used in base member initializer list */
1385QT_WARNING_DISABLE_MSVC(4710) /* function not inlined */
1386QT_WARNING_DISABLE_MSVC(4530) /* C++ exception handler used, but unwind semantics are not enabled. Specify /EHsc */
1387# elif defined(Q_CC_BOR)
1388# pragma option -w-inl
1389# pragma option -w-aus
1390# pragma warn -inl
1391# pragma warn -pia
1392# pragma warn -ccc
1393# pragma warn -rch
1394# pragma warn -sig
1395# endif
1396#endif
1397
1398#if !defined(QT_NO_EXCEPTIONS)
1399# if !defined(Q_MOC_RUN)
1400# if defined(Q_CC_GNU) && !defined(__cpp_exceptions)
1401# define QT_NO_EXCEPTIONS
1402# endif
1403# elif defined(QT_BOOTSTRAPPED)
1404# define QT_NO_EXCEPTIONS
1405# endif
1406#endif
1407
1408// libstdc++ shipped with gcc < 11 does not have a fix for defect LWG 3346
1409#if __cplusplus >= 202002L && (!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE >= 11)
1410# define QT_COMPILER_HAS_LWG3346
1411#endif
1412
1413#if defined(__cplusplus) && __cplusplus >= 202002L // P0846 doesn't have a feature macro :/
1414# if !defined(Q_CC_MSVC_ONLY) || Q_CC_MSVC >= 1939 // claims C++20 support but lacks P0846
1415 // 1939 is known to work
1416 // 1936 is known to fail
1417# define QT_COMPILER_HAS_P0846
1418# endif
1419#endif
1420
1421#ifdef QT_COMPILER_HAS_P0846
1422# define QT_ENABLE_P0846_SEMANTICS_FOR(func)
1423#else
1424 class QT_CLASS_JUST_FOR_P0846_SIMULATION;
1425# define QT_ENABLE_P0846_SEMANTICS_FOR(func) \
1426 template <typename T> \
1427 void func (QT_CLASS_JUST_FOR_P0846_SIMULATION *); \
1428 /* end */
1429#endif // !P0846
1430
1431#endif // __cplusplus
1432
1433#endif // QCOMPILERDETECTION_H
1434

source code of qtbase/src/corelib/global/qcompilerdetection.h