Move compiler detection from qglobal.h to a separate header

qcompilerdetection.h is included from qglobal.h, and does all Q_CC_*
and compiler feature detection.

Change-Id: Idd06054e172ef6fa73774e26fa38753996c4161b
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 551 insertions, 0 deletions

diff --git a/src/corelib/global/qcompilerdetection.h b/src/corelib/global/qcompilerdetection.h
new file mode 100644
index 0000000000..7621b76f54
--- /dev/null
+++ b/src/corelib/global/qcompilerdetection.h
@@ -0,0 +1,551 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QCOMPILERDETECTION_H
+#define QCOMPILERDETECTION_H
+
+#if 0
+// header is automatically included in qglobal.h
+#pragma qt_no_master_include
+
+// silence syncqt warnings (QT_* macros are not yet defined)
+QT_BEGIN_HEADER
+QT_BEGIN_NAMESPACE
+
+QT_END_NAMESPACE
+QT_END_HEADER
+
+#pragma qt_sync_stop_processing
+#endif
+
+/*
+   The compiler, must be one of: (Q_CC_x)
+
+     SYM      - Digital Mars C/C++ (used to be Symantec C++)
+     MSVC     - Microsoft Visual C/C++, Intel C++ for Windows
+     BOR      - Borland/Turbo C++
+     WAT      - Watcom C++
+     GNU      - GNU C++
+     COMEAU   - Comeau C++
+     EDG      - Edison Design Group C++
+     OC       - CenterLine C++
+     SUN      - Forte Developer, or Sun Studio C++
+     MIPS     - MIPSpro C++
+     DEC      - DEC C++
+     HPACC    - HP aC++
+     USLC     - SCO OUDK and UDK
+     CDS      - Reliant C++
+     KAI      - KAI C++
+     INTEL    - Intel C++ for Linux, Intel C++ for Windows
+     HIGHC    - MetaWare High C/C++
+     PGI      - Portland Group C++
+     GHS      - Green Hills Optimizing C++ Compilers
+     RVCT     - ARM Realview Compiler Suite
+     CLANG    - C++ front-end for the LLVM compiler
+
+
+   Should be sorted most to least authoritative.
+*/
+
+/* Symantec C++ is now Digital Mars */
+#if defined(__DMC__) || defined(__SC__)
+#  define Q_CC_SYM
+/* "explicit" semantics implemented in 8.1e but keyword recognized since 7.5 */
+#  if defined(__SC__) && __SC__ < 0x750
+#    define Q_NO_EXPLICIT_KEYWORD
+#  endif
+#  define Q_NO_USING_KEYWORD
+
+#elif defined(_MSC_VER)
+#  define Q_CC_MSVC
+#  define Q_CC_MSVC_NET
+#  define Q_CANNOT_DELETE_CONSTANT
+#  define Q_OUTOFLINE_TEMPLATE inline
+#  define Q_NO_TEMPLATE_FRIENDS
+#  define Q_ALIGNOF(type) __alignof(type)
+#  define Q_DECL_ALIGN(n) __declspec(align(n))
+/* Intel C++ disguising as Visual C++: the `using' keyword avoids warnings */
+#  if defined(__INTEL_COMPILER)
+#    define Q_CC_INTEL
+#  endif
+/* MSVC does not support SSE/MMX on x64 */
+#  if (defined(Q_CC_MSVC) && defined(_M_X64))
+#    undef QT_HAVE_SSE
+#    undef QT_HAVE_MMX
+#    undef QT_HAVE_3DNOW
+#  endif
+
+#if defined(Q_CC_MSVC) && _MSC_VER >= 1600
+#      define Q_COMPILER_RVALUE_REFS
+#      define Q_COMPILER_AUTO_TYPE
+#      define Q_COMPILER_LAMBDA
+#      define Q_COMPILER_DECLTYPE
+#      define Q_COMPILER_STATIC_ASSERT
+//  MSCV has std::initilizer_list, but do not support the braces initialization
+//#      define Q_COMPILER_INITIALIZER_LISTS
+#  endif
+
+
+#elif defined(__BORLANDC__) || defined(__TURBOC__)
+#  define Q_CC_BOR
+#  define Q_INLINE_TEMPLATE
+#  if __BORLANDC__ < 0x502
+#    define Q_NO_BOOL_TYPE
+#    define Q_NO_EXPLICIT_KEYWORD
+#  endif
+#  define Q_NO_USING_KEYWORD
+
+#elif defined(__WATCOMC__)
+#  define Q_CC_WAT
+
+/* ARM Realview Compiler Suite
+   RVCT compiler also defines __EDG__ and __GNUC__ (if --gnu flag is given),
+   so check for it before that */
+#elif defined(__ARMCC__) || defined(__CC_ARM)
+#  define Q_CC_RVCT
+#  if __TARGET_ARCH_ARM >= 6
+#    define QT_HAVE_ARMV6
+#  endif
+/* work-around for missing compiler intrinsics */
+#  define __is_empty(X) false
+#  define __is_pod(X) false
+#elif defined(__GNUC__)
+#  define Q_CC_GNU
+#  define Q_C_CALLBACKS
+#  if defined(__MINGW32__)
+#    define Q_CC_MINGW
+#  endif
+#  if defined(__INTEL_COMPILER)
+/* Intel C++ also masquerades as GCC 3.2.0 */
+#    define Q_CC_INTEL
+#  endif
+#  if defined(__clang__)
+/* Clang also masquerades as GCC 4.2.1 */
+#    define Q_CC_CLANG
+#  endif
+#  ifdef __APPLE__
+#    define Q_NO_DEPRECATED_CONSTRUCTORS
+#  endif
+#  if __GNUC__ == 2 && __GNUC_MINOR__ <= 7
+#    define Q_FULL_TEMPLATE_INSTANTIATION
+#  endif
+/* GCC 2.95 knows "using" but does not support it correctly */
+#  if __GNUC__ == 2 && __GNUC_MINOR__ <= 95
+#    define Q_NO_USING_KEYWORD
+#  endif
+#  if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
+#    define Q_ALIGNOF(type)   __alignof__(type)
+#    define Q_TYPEOF(expr)    __typeof__(expr)
+#    define Q_DECL_ALIGN(n)   __attribute__((__aligned__(n)))
+#  endif
+#  if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
+#    define Q_LIKELY(expr)    __builtin_expect(!!(expr), true)
+#    define Q_UNLIKELY(expr)  __builtin_expect(!!(expr), false)
+#  endif
+/* GCC 3.1 and GCC 3.2 wrongly define _SB_CTYPE_MACROS on HP-UX */
+#  if defined(Q_OS_HPUX) && __GNUC__ == 3 && __GNUC_MINOR__ >= 1
+#    define Q_WRONG_SB_CTYPE_MACROS
+#  endif
+/* GCC <= 3.3 cannot handle template friends */
+#  if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ <= 3)
+#    define Q_NO_TEMPLATE_FRIENDS
+#  endif
+/* Apple's GCC 3.1 chokes on our streaming qDebug() */
+#  if defined(Q_OS_DARWIN) && __GNUC__ == 3 && (__GNUC_MINOR__ >= 1 && __GNUC_MINOR__ < 3)
+#    define Q_BROKEN_DEBUG_STREAM
+#  endif
+#  if (defined(Q_CC_GNU) || defined(Q_CC_INTEL)) && !defined(QT_MOC_CPP)
+#    define Q_PACKED __attribute__ ((__packed__))
+#    define Q_NO_PACKED_REFERENCE
+#    ifndef __ARM_EABI__
+#      define QT_NO_ARM_EABI
+#    endif
+#  endif
+#  if (__GNUC__ * 100 + __GNUC_MINOR__) >= 403
+#      define Q_ALLOC_SIZE(x) __attribute__((alloc_size(x)))
+#  endif
+#  if defined(__GXX_EXPERIMENTAL_CXX0X__) && !defined(__clang__) /* clang C++11 enablers are found below, don't do them here */
+#    if (__GNUC__ * 100 + __GNUC_MINOR__) >= 403
+       /* C++0x features supported in GCC 4.3: */
+#      define Q_COMPILER_VARIADIC_MACROS
+#      define Q_COMPILER_RVALUE_REFS
+#      define Q_COMPILER_DECLTYPE
+#      define Q_COMPILER_STATIC_ASSERT
+#    endif
+#    if (__GNUC__ * 100 + __GNUC_MINOR__) >= 404
+       /* C++0x features supported in GCC 4.4: */
+#      define Q_COMPILER_UNICODE_STRINGS
+#      define Q_COMPILER_VARIADIC_TEMPLATES
+#      define Q_COMPILER_AUTO_TYPE
+#      define Q_COMPILER_EXTERN_TEMPLATES
+#      define Q_COMPILER_DEFAULT_DELETE_MEMBERS
+#      define Q_COMPILER_CLASS_ENUM
+#      define Q_COMPILER_INITIALIZER_LISTS
+#      define Q_COMPILER_ATOMICS
+#    endif
+#    if (__GNUC__ * 100 + __GNUC_MINOR__) >= 405
+       /* C++0x features supported in GCC 4.5: */
+#      define Q_COMPILER_LAMBDA
+#    endif
+#    if (__GNUC__ * 100 + __GNUC_MINOR__) >= 406
+       /* C++0x features supported in GCC 4.6: */
+#      define Q_COMPILER_NULLPTR
+#      define Q_COMPILER_CONSTEXPR
+#      define Q_COMPILER_UNRESTRICTED_UNIONS
+#      define Q_COMPILER_RANGE_FOR
+#    endif
+#    if (__GNUC__ * 100 + __GNUC_MINOR__) >= 407
+       /* C++0x features supported in GCC 4.7: */
+#      define Q_COMPILER_EXPLICIT_OVERRIDES
+#    endif
+
+#  endif
+
+/* IBM compiler versions are a bit messy. There are actually two products:
+   the C product, and the C++ product. The C++ compiler is always packaged
+   with the latest version of the C compiler. Version numbers do not always
+   match. This little table (I'm not sure it's accurate) should be helpful:
+
+   C++ product                C product
+
+   C Set 3.1                  C Compiler 3.0
+   ...                        ...
+   C++ Compiler 3.6.6         C Compiler 4.3
+   ...                        ...
+   Visual Age C++ 4.0         ...
+   ...                        ...
+   Visual Age C++ 5.0         C Compiler 5.0
+   ...                        ...
+   Visual Age C++ 6.0         C Compiler 6.0
+
+   Now:
+   __xlC__    is the version of the C compiler in hexadecimal notation
+              is only an approximation of the C++ compiler version
+   __IBMCPP__ is the version of the C++ compiler in decimal notation
+              but it is not defined on older compilers like C Set 3.1 */
+#elif defined(__xlC__)
+#  define Q_CC_XLC
+#  define Q_FULL_TEMPLATE_INSTANTIATION
+#  if __xlC__ < 0x400
+#    define Q_NO_BOOL_TYPE
+#    define Q_NO_EXPLICIT_KEYWORD
+#    define Q_NO_USING_KEYWORD
+#    define Q_OUTOFLINE_TEMPLATE inline
+#    define Q_BROKEN_TEMPLATE_SPECIALIZATION
+#    define Q_CANNOT_DELETE_CONSTANT
+#  elif __xlC__ >= 0x0600
+#    define Q_ALIGNOF(type)     __alignof__(type)
+#    define Q_TYPEOF(expr)      __typeof__(expr)
+#    define Q_DECL_ALIGN(n)     __attribute__((__aligned__(n)))
+#    define Q_PACKED            __attribute__((__packed__))
+#  endif
+
+/* Older versions of DEC C++ do not define __EDG__ or __EDG - observed
+   on DEC C++ V5.5-004. New versions do define  __EDG__ - observed on
+   Compaq C++ V6.3-002.
+   This compiler is different enough from other EDG compilers to handle
+   it separately anyway. */
+#elif defined(__DECCXX) || defined(__DECC)
+#  define Q_CC_DEC
+/* Compaq C++ V6 compilers are EDG-based but I'm not sure about older
+   DEC C++ V5 compilers. */
+#  if defined(__EDG__)
+#    define Q_CC_EDG
+#  endif
+/* Compaq have disabled EDG's _BOOL macro and use _BOOL_EXISTS instead
+   - observed on Compaq C++ V6.3-002.
+   In any case versions prior to Compaq C++ V6.0-005 do not have bool. */
+#  if !defined(_BOOL_EXISTS)
+#    define Q_NO_BOOL_TYPE
+#  endif
+/* Spurious (?) error messages observed on Compaq C++ V6.5-014. */
+#  define Q_NO_USING_KEYWORD
+/* Apply to all versions prior to Compaq C++ V6.0-000 - observed on
+   DEC C++ V5.5-004. */
+#  if __DECCXX_VER < 60060000
+#    define Q_BROKEN_TEMPLATE_SPECIALIZATION
+#    define Q_CANNOT_DELETE_CONSTANT
+#  endif
+/* avoid undefined symbol problems with out-of-line template members */
+#  define Q_OUTOFLINE_TEMPLATE inline
+
+/* The Portland Group C++ compiler is based on EDG and does define __EDG__
+   but the C compiler does not */
+#elif defined(__PGI)
+#  define Q_CC_PGI
+#  if defined(__EDG__)
+#    define Q_CC_EDG
+#  endif
+
+/* Compilers with EDG front end are similar. To detect them we test:
+   __EDG documented by SGI, observed on MIPSpro 7.3.1.1 and KAI C++ 4.0b
+   __EDG__ documented in EDG online docs, observed on Compaq C++ V6.3-002
+   and PGI C++ 5.2-4 */
+#elif !defined(Q_OS_HPUX) && (defined(__EDG) || defined(__EDG__))
+#  define Q_CC_EDG
+/* From the EDG documentation (does not seem to apply to Compaq C++):
+   _BOOL
+        Defined in C++ mode when bool is a keyword. The name of this
+        predefined macro is specified by a configuration flag. _BOOL
+        is the default.
+   __BOOL_DEFINED
+        Defined in Microsoft C++ mode when bool is a keyword. */
+#  if !defined(_BOOL) && !defined(__BOOL_DEFINED)
+#    define Q_NO_BOOL_TYPE
+#  endif
+
+/* The Comeau compiler is based on EDG and does define __EDG__ */
+#  if defined(__COMO__)
+#    define Q_CC_COMEAU
+#    define Q_C_CALLBACKS
+
+/* The `using' keyword was introduced to avoid KAI C++ warnings
+   but it's now causing KAI C++ errors instead. The standard is
+   unclear about the use of this keyword, and in practice every
+   compiler is using its own set of rules. Forget it. */
+#  elif defined(__KCC)
+#    define Q_CC_KAI
+#    define Q_NO_USING_KEYWORD
+
+/* Using the `using' keyword avoids Intel C++ for Linux warnings */
+#  elif defined(__INTEL_COMPILER)
+#    define Q_CC_INTEL
+
+/* Uses CFront, make sure to read the manual how to tweak templates. */
+#  elif defined(__ghs)
+#    define Q_CC_GHS
+
+#  elif defined(__DCC__)
+#    define Q_CC_DIAB
+#    undef Q_NO_BOOL_TYPE
+#    if !defined(__bool)
+#      define Q_NO_BOOL_TYPE
+#    endif
+
+/* The UnixWare 7 UDK compiler is based on EDG and does define __EDG__ */
+#  elif defined(__USLC__) && defined(__SCO_VERSION__)
+#    define Q_CC_USLC
+/* The latest UDK 7.1.1b does not need this, but previous versions do */
+#    if !defined(__SCO_VERSION__) || (__SCO_VERSION__ < 302200010)
+#      define Q_OUTOFLINE_TEMPLATE inline
+#    endif
+#    define Q_NO_USING_KEYWORD /* ### check "using" status */
+
+/* Never tested! */
+#  elif defined(CENTERLINE_CLPP) || defined(OBJECTCENTER)
+#    define Q_CC_OC
+#    define Q_NO_USING_KEYWORD
+
+/* CDS++ defines __EDG__ although this is not documented in the Reliant
+   documentation. It also follows conventions like _BOOL and this documented */
+#  elif defined(sinix)
+#    define Q_CC_CDS
+#    define Q_NO_USING_KEYWORD
+
+/* The MIPSpro compiler defines __EDG */
+#  elif defined(__sgi)
+#    define Q_CC_MIPS
+#    define Q_NO_USING_KEYWORD /* ### check "using" status */
+#    define Q_NO_TEMPLATE_FRIENDS
+#    if defined(_COMPILER_VERSION) && (_COMPILER_VERSION >= 740)
+#      define Q_OUTOFLINE_TEMPLATE inline
+#      pragma set woff 3624,3625,3649 /* turn off some harmless warnings */
+#    endif
+#  endif
+
+/* VxWorks' DIAB toolchain has an additional EDG type C++ compiler
+   (see __DCC__ above). This one is for C mode files (__EDG is not defined) */
+#elif defined(_DIAB_TOOL)
+#  define Q_CC_DIAB
+
+/* Never tested! */
+#elif defined(__HIGHC__)
+#  define Q_CC_HIGHC
+
+#elif defined(__SUNPRO_CC) || defined(__SUNPRO_C)
+#  define Q_CC_SUN
+/* 5.0 compiler or better
+    'bool' is enabled by default but can be disabled using -features=nobool
+    in which case _BOOL is not defined
+        this is the default in 4.2 compatibility mode triggered by -compat=4 */
+#  if __SUNPRO_CC >= 0x500
+#    define QT_NO_TEMPLATE_TEMPLATE_PARAMETERS
+   /* see http://developers.sun.com/sunstudio/support/Ccompare.html */
+#    if __SUNPRO_CC >= 0x590
+#      define Q_ALIGNOF(type)   __alignof__(type)
+#      define Q_TYPEOF(expr)    __typeof__(expr)
+#      define Q_DECL_ALIGN(n)   __attribute__((__aligned__(n)))
+#    endif
+#    if __SUNPRO_CC >= 0x550
+#      define Q_DECL_EXPORT     __global
+#    endif
+#    if __SUNPRO_CC < 0x5a0
+#      define Q_NO_TEMPLATE_FRIENDS
+#    endif
+#    if !defined(_BOOL)
+#      define Q_NO_BOOL_TYPE
+#    endif
+#    if defined(__SUNPRO_CC_COMPAT) && (__SUNPRO_CC_COMPAT <= 4)
+#      define Q_NO_USING_KEYWORD
+#    endif
+#    define Q_C_CALLBACKS
+/* 4.2 compiler or older */
+#  else
+#    define Q_NO_BOOL_TYPE
+#    define Q_NO_EXPLICIT_KEYWORD
+#    define Q_NO_USING_KEYWORD
+#  endif
+
+/* CDS++ does not seem to define __EDG__ or __EDG according to Reliant
+   documentation but nevertheless uses EDG conventions like _BOOL */
+#elif defined(sinix)
+#  define Q_CC_EDG
+#  define Q_CC_CDS
+#  if !defined(_BOOL)
+#    define Q_NO_BOOL_TYPE
+#  endif
+#  define Q_BROKEN_TEMPLATE_SPECIALIZATION
+
+#elif defined(Q_OS_HPUX)
+/* __HP_aCC was not defined in first aCC releases */
+#  if defined(__HP_aCC) || __cplusplus >= 199707L
+#    define Q_NO_TEMPLATE_FRIENDS
+#    define Q_CC_HPACC
+#    if __HP_aCC-0 < 060000
+#      define QT_NO_TEMPLATE_TEMPLATE_PARAMETERS
+#      define Q_DECL_EXPORT     __declspec(dllexport)
+#      define Q_DECL_IMPORT     __declspec(dllimport)
+#    endif
+#    if __HP_aCC-0 >= 061200
+#      define Q_DECL_ALIGN(n) __attribute__((aligned(n)))
+#    endif
+#    if __HP_aCC-0 >= 062000
+#      define Q_DECL_EXPORT     __attribute__((visibility("default")))
+#      define Q_DECL_HIDDEN     __attribute__((visibility("hidden")))
+#      define Q_DECL_IMPORT     Q_DECL_EXPORT
+#    endif
+#  else
+#    define Q_CC_HP
+#    define Q_NO_BOOL_TYPE
+#    define Q_FULL_TEMPLATE_INSTANTIATION
+#    define Q_BROKEN_TEMPLATE_SPECIALIZATION
+#    define Q_NO_EXPLICIT_KEYWORD
+#  endif
+#  define Q_NO_USING_KEYWORD /* ### check "using" status */
+
+#else
+#  error "Qt has not been tested with this compiler - see http://www.qt-project.org/"
+#endif
+
+
+#ifdef Q_CC_INTEL
+#  if __INTEL_COMPILER < 1200
+#    define Q_NO_TEMPLATE_FRIENDS
+#  endif
+#  if defined(__GXX_EXPERIMENTAL_CXX0X__) || defined(__GXX_EXPERIMENTAL_CPP0X__)
+#    if __INTEL_COMPILER >= 1200
+#      define Q_COMPILER_RVALUE_REFS
+#      define Q_COMPILER_EXTERN_TEMPLATES
+#      define Q_COMPILER_DECLTYPE
+#      define Q_COMPILER_VARIADIC_TEMPLATES
+#      define Q_COMPILER_AUTO_TYPE
+#      define Q_COMPILER_DEFAULT_DELETE_MEMBERS
+#      define Q_COMPILER_CLASS_ENUM
+#      define Q_COMPILER_LAMBDA
+#      define Q_COMPILER_STATIC_ASSERT
+#    endif
+#  endif
+#endif
+
+#ifdef Q_CC_CLANG
+/* General C++ features */
+#  if !__has_feature(cxx_exceptions)
+#    define QT_NO_EXCEPTIONS
+#  endif
+#  if !__has_feature(cxx_rtti)
+#    define QT_NO_RTTI
+#  endif
+/* C++11 features, see http://clang.llvm.org/cxx_status.html */
+#  if __cplusplus >= 201103L || __GXX_EXPERIMENTAL_CXX0X__
+#    if ((__clang_major__ * 100) + __clang_minor__) >= 209 /* since clang 2.9 */
+#      define Q_COMPILER_AUTO_TYPE
+#      define Q_COMPILER_DECLTYPE
+#      define Q_COMPILER_EXTERN_TEMPLATES
+#      define Q_COMPILER_RVALUE_REFS
+#      define Q_COMPILER_STATIC_ASSERT
+#      define Q_COMPILER_VARIADIC_MACROS
+#      define Q_COMPILER_VARIADIC_TEMPLATES
+#    endif
+#    if ((__clang_major__ * 100) + __clang_minor__) >= 300 /* since clang 3.0 */
+#      define Q_COMPILER_CLASS_ENUM
+        /* defaulted members in 3.0, deleted members in 2.9 */
+#      define Q_COMPILER_DEFAULT_DELETE_MEMBERS
+#      define Q_COMPILER_EXPLICIT_OVERRIDES
+#      define Q_COMPILER_NULLPTR
+#      define Q_COMPILER_RANGE_FOR
+#      define Q_COMPILER_UNICODE_STRINGS
+#    endif
+        /* not implemented in clang yet */
+#    if __has_feature(cxx_constexpr)
+#      define Q_COMPILER_CONSTEXPR
+#    endif
+#    if __has_feature(cxx_lambdas)
+#      define Q_COMPILER_LAMBDA
+#    endif
+#    if __has_feature(cxx_generalized_initializers)
+#      define Q_COMPILER_INITIALIZER_LISTS
+#    endif
+#    if __has_feature(cxx_unrestricted_unions)
+#      define Q_COMPILER_UNRESTRICTED_UNIONS
+#    endif
+#    if 0
+#      define Q_COMPILER_ATOMICS
+#    endif
+#  endif
+#endif // Q_CC_CLANG
+
+#ifndef Q_COMPILER_MANGLES_RETURN_TYPE
+#  if defined(Q_CC_MSVC)
+#    define Q_COMPILER_MANGLES_RETURN_TYPE
+#  endif
+#endif
+
+#endif // QCOMPILERDETECTION_H