Remove remnants of the old Intel C++ compiler

We don't support it any more. I don't think it has ever properly
compiled Qt 6 (and it's no longer working for me against GCC 12's
libstdc++ headers). If you report a bug against it, Intel support's
first question is if you can try instead the new Clang/LLVM-based oneAPI
C++ compiler.

So we support only that one, which identifies itself as Q_CC_CLANG.

Change-Id: I5ff8e16fcdcb4ffd9ab6fffd16eb57a092c8439e
Reviewed-by: Marc Mutz <marc.mutz@qt.io>

12 files changed, 28 insertions, 187 deletions

diff --git a/src/corelib/global/qcompilerdetection.h b/src/corelib/global/qcompilerdetection.h
index f7989da8be..7a03bcf9fd 100644
--- a/src/corelib/global/qcompilerdetection.h
+++ b/src/corelib/global/qcompilerdetection.h
@@ -1,7 +1,7 @@
 /****************************************************************************
 **
 ** Copyright (C) 2022 The Qt Company Ltd.
-** Copyright (C) 2016 Intel Corporation.
+** Copyright (C) 2022 Intel Corporation.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtCore module of the Qt Toolkit.
@@ -105,15 +105,10 @@
 #  define Q_DECL_IMPORT __declspec(dllimport)
 #  define QT_MAKE_UNCHECKED_ARRAY_ITERATOR(x) stdext::make_unchecked_array_iterator(x) // Since _MSC_VER >= 1800
 #  define QT_MAKE_CHECKED_ARRAY_ITERATOR(x, N) stdext::make_checked_array_iterator(x, size_t(N)) // Since _MSC_VER >= 1500
-/* Intel C++ disguising as Visual C++: the `using' keyword avoids warnings */
-#  if defined(__INTEL_COMPILER)
 #    undef Q_CC_MSVC_ONLY
 #    ifdef Q_CC_CLANG_ONLY
 #      undef Q_CC_CLANG_ONLY
 #    endif
-#    define Q_DECL_VARIABLE_DEPRECATED
-#    define Q_CC_INTEL  __INTEL_COMPILER
-#  endif
 
 #elif defined(__BORLANDC__) || defined(__TURBOC__)
 #  define Q_CC_BOR
@@ -148,19 +143,7 @@
 #  if defined(__MINGW32__)
 #    define Q_CC_MINGW
 #  endif
-#  if defined(__INTEL_COMPILER)
-/* Intel C++ also masquerades as GCC */
-#    define Q_CC_INTEL      (__INTEL_COMPILER)
-#    ifdef __clang__
-/* Intel C++ masquerades as Clang masquerading as GCC */
-#      define Q_CC_CLANG    305
-#    endif
-#    define Q_ASSUME_IMPL(expr)  __assume(expr)
-#    define Q_UNREACHABLE_IMPL() __builtin_unreachable()
-#    if __INTEL_COMPILER >= 1300 && !defined(__APPLE__)
-#      define Q_DECL_DEPRECATED_X(text) __attribute__ ((__deprecated__(text)))
-#    endif
-#  elif defined(__clang__)
+#  if defined(__clang__)
 /* Clang also masquerades as GCC */
 #    if defined(__apple_build_version__)
       // The Clang version reported by Apple Clang in __clang_major__
@@ -349,10 +332,6 @@
 #  elif defined(__KCC)
 #    define Q_CC_KAI
 
-/* Using the `using' keyword avoids Intel C++ for Linux warnings */
-#  elif defined(__INTEL_COMPILER)
-#    define Q_CC_INTEL      (__INTEL_COMPILER)
-
 /* Uses CFront, make sure to read the manual how to tweak templates. */
 #  elif defined(__ghs)
 #    define Q_CC_GHS
@@ -565,82 +544,7 @@
 #  endif
 #endif
 
-#if defined(Q_CC_INTEL) && !defined(Q_CC_MSVC)
-#  define Q_COMPILER_RESTRICTED_VLA
-#  define Q_COMPILER_VARIADIC_MACROS // C++11 feature supported as an extension in other modes, too
-#  if __INTEL_COMPILER < 1200
-#    define Q_NO_TEMPLATE_FRIENDS
-#  endif
-#  if __INTEL_COMPILER >= 1310 && !defined(_WIN32)
-//    ICC supports C++14 binary literals in C, C++98, and C++11 modes
-//    at least since 13.1, but I can't test further back
-#     define Q_COMPILER_BINARY_LITERALS
-#  endif
-#  if __cplusplus >= 201103L || defined(__INTEL_CXX11_MODE__)
-#    if __INTEL_COMPILER >= 1200
-#      define Q_COMPILER_AUTO_TYPE
-#      define Q_COMPILER_CLASS_ENUM
-#      define Q_COMPILER_DECLTYPE
-#      define Q_COMPILER_DEFAULT_MEMBERS
-#      define Q_COMPILER_DELETE_MEMBERS
-#      define Q_COMPILER_EXTERN_TEMPLATES
-#      define Q_COMPILER_LAMBDA
-#      define Q_COMPILER_RVALUE_REFS
-#      define Q_COMPILER_STATIC_ASSERT
-#      define Q_COMPILER_VARIADIC_MACROS
-#    endif
-#    if __INTEL_COMPILER >= 1210
-#      define Q_COMPILER_ATTRIBUTES
-#      define Q_COMPILER_AUTO_FUNCTION
-#      define Q_COMPILER_NULLPTR
-#      define Q_COMPILER_TEMPLATE_ALIAS
-#      ifndef _CHAR16T      // MSVC headers
-#        define Q_COMPILER_UNICODE_STRINGS
-#      endif
-#      define Q_COMPILER_VARIADIC_TEMPLATES
-#    endif
-#    if __INTEL_COMPILER >= 1300
-#      define Q_COMPILER_ATOMICS
-//       constexpr support is only partial
-//#      define Q_COMPILER_CONSTEXPR
-#      define Q_COMPILER_INITIALIZER_LISTS
-#      define Q_COMPILER_UNIFORM_INIT
-#      define Q_COMPILER_NOEXCEPT
-#    endif
-#    if __INTEL_COMPILER >= 1400
-//       causes issues with QArrayData and QtPrivate::RefCount - Intel issue ID 6000056211, bug DPD200534796
-//#      define Q_COMPILER_CONSTEXPR
-#      define Q_COMPILER_DELEGATING_CONSTRUCTORS
-#      define Q_COMPILER_EXPLICIT_CONVERSIONS
-#      define Q_COMPILER_EXPLICIT_OVERRIDES
-#      define Q_COMPILER_NONSTATIC_MEMBER_INIT
-#      define Q_COMPILER_RANGE_FOR
-#      define Q_COMPILER_RAW_STRINGS
-#      define Q_COMPILER_REF_QUALIFIERS
-#      define Q_COMPILER_UNICODE_STRINGS
-#      define Q_COMPILER_UNRESTRICTED_UNIONS
-#    endif
-#    if __INTEL_COMPILER >= 1500
-#      if __INTEL_COMPILER * 100 + __INTEL_COMPILER_UPDATE >= 150001
-//       the bug mentioned above is fixed in 15.0.1
-#        define Q_COMPILER_CONSTEXPR
-#      endif
-#      define Q_COMPILER_ALIGNAS
-#      define Q_COMPILER_ALIGNOF
-#      define Q_COMPILER_INHERITING_CONSTRUCTORS
-#      define Q_COMPILER_THREAD_LOCAL
-#      define Q_COMPILER_UDL
-#    endif
-#  elif defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
-//   C11 features supported. Only tested with ICC 17 and up.
-#    define Q_COMPILER_STATIC_ASSERT
-#    if __has_include(<threads.h>)
-#      define Q_COMPILER_THREAD_LOCAL
-#    endif
-#  endif
-#endif
-
-#if defined(Q_CC_CLANG) && !defined(Q_CC_INTEL)
+#if defined(Q_CC_CLANG)
 /* General C++ features */
 #  define Q_COMPILER_RESTRICTED_VLA
 #  if __has_feature(attribute_deprecated_with_message)
@@ -803,7 +707,7 @@
 #    define Q_DECL_UNUSED __attribute__((__unused__))
 #  endif
 #  define Q_DECL_UNUSED_MEMBER Q_DECL_UNUSED
-#endif //  defined(Q_CC_CLANG) && !defined(Q_CC_INTEL)
+#endif //  defined(Q_CC_CLANG)
 
 #if defined(Q_CC_GNU_ONLY)
 #  define Q_COMPILER_RESTRICTED_VLA
@@ -1010,7 +914,7 @@
 #   endif // !_HAS_CONSTEXPR
 #  endif // !__GLIBCXX__ && !_LIBCPP_VERSION
 # endif // Q_OS_QNX
-# if (defined(Q_CC_CLANG) || defined(Q_CC_INTEL)) && defined(Q_OS_MAC) && defined(__GNUC_LIBSTD__) \
+# if defined(Q_CC_CLANG) && defined(Q_OS_MAC) && defined(__GNUC_LIBSTD__) \
     && ((__GNUC_LIBSTD__-0) * 100 + __GNUC_LIBSTD_MINOR__-0 <= 402)
 // Apple has not updated libstdc++ since 2007, which means it does not have
 // <initializer_list> or std::move. Let's disable these features
@@ -1020,13 +924,6 @@
 // Also disable <atomic>, since it's clearly not there
 #  undef Q_COMPILER_ATOMICS
 # endif
-# if defined(Q_CC_CLANG) && defined(Q_CC_INTEL) && Q_CC_INTEL >= 1500
-// ICC 15.x and 16.0 have their own implementation of std::atomic, which is activated when in Clang mode
-// (probably because libc++'s <atomic> on OS X failed to compile), but they're missing some
-// critical definitions. (Reported as Intel Issue ID 6000117277)
-#  define __USE_CONSTEXPR 1
-#  define __USE_NOEXCEPT 1
-# endif
 #endif
 
 /*
@@ -1240,30 +1137,7 @@
  */
 
 #define QT_DO_PRAGMA(text)                      _Pragma(#text)
-#if defined(Q_CC_INTEL) && defined(Q_CC_MSVC)
-/* icl.exe: Intel compiler on Windows */
-#  undef QT_DO_PRAGMA                           /* not needed */
-#  define QT_WARNING_PUSH                       __pragma(warning(push))
-#  define QT_WARNING_POP                        __pragma(warning(pop))
-#  define QT_WARNING_DISABLE_MSVC(number)
-#  define QT_WARNING_DISABLE_INTEL(number)      __pragma(warning(disable: number))
-#  define QT_WARNING_DISABLE_CLANG(text)
-#  define QT_WARNING_DISABLE_GCC(text)
-#  define QT_WARNING_DISABLE_DEPRECATED         QT_WARNING_DISABLE_INTEL(1478 1786)
-#  define QT_WARNING_DISABLE_FLOAT_COMPARE      QT_WARNING_DISABLE_INTEL(1572)
-#  define QT_WARNING_DISABLE_INVALID_OFFSETOF
-#elif defined(Q_CC_INTEL)
-/* icc: Intel compiler on Linux or OS X */
-#  define QT_WARNING_PUSH                       QT_DO_PRAGMA(warning(push))
-#  define QT_WARNING_POP                        QT_DO_PRAGMA(warning(pop))
-#  define QT_WARNING_DISABLE_INTEL(number)      QT_DO_PRAGMA(warning(disable: number))
-#  define QT_WARNING_DISABLE_MSVC(number)
-#  define QT_WARNING_DISABLE_CLANG(text)
-#  define QT_WARNING_DISABLE_GCC(text)
-#  define QT_WARNING_DISABLE_DEPRECATED         QT_WARNING_DISABLE_INTEL(1478 1786)
-#  define QT_WARNING_DISABLE_FLOAT_COMPARE      QT_WARNING_DISABLE_INTEL(1572)
-#  define QT_WARNING_DISABLE_INVALID_OFFSETOF
-#elif defined(Q_CC_MSVC) && !defined(Q_CC_CLANG)
+#if defined(Q_CC_MSVC) && !defined(Q_CC_CLANG)
 #  undef QT_DO_PRAGMA                           /* not needed */
 #  define QT_WARNING_PUSH                       __pragma(warning(push))
 #  define QT_WARNING_POP                        __pragma(warning(pop))
diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp
index e184954cb2..1f9ac131d4 100644
--- a/src/corelib/global/qglobal.cpp
+++ b/src/corelib/global/qglobal.cpp
@@ -1728,9 +1728,13 @@ bool qSharedBuild() noexcept
 /*!
     \macro Q_CC_INTEL
     \relates <QtGlobal>
+    \obsolete
 
-    Defined if the application is compiled using Intel C++ for Linux,
-    Intel C++ for Windows.
+    This macro used to be defined if the application was compiled with the old
+    Intel C++ compiler for Linux, macOS or Windows. The new oneAPI C++ compiler
+    is just a build of Clang and therefore does not define this macro.
+
+    \sa Q_CC_CLANG
 */
 
 /*!
@@ -3382,7 +3386,7 @@ void qAbort()
     // [support.start.term]). So we bypass std::abort() and directly
     // terminate the application.
 
-#  if defined(Q_CC_MSVC) && !defined(Q_CC_INTEL)
+#  if defined(Q_CC_MSVC)
     if (IsProcessorFeaturePresent(PF_FASTFAIL_AVAILABLE))
         __fastfail(FAST_FAIL_FATAL_APP_EXIT);
 #  else
diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h
index 82a33939dc..998cf7d2a1 100644
--- a/src/corelib/global/qglobal.h
+++ b/src/corelib/global/qglobal.h
@@ -840,7 +840,7 @@ inline void qt_noop(void) {}
 
 #if !defined(QT_NO_EXCEPTIONS)
 #  if !defined(Q_MOC_RUN)
-#    if (defined(Q_CC_CLANG) && !defined(Q_CC_INTEL) && !__has_feature(cxx_exceptions)) || \
+#    if (defined(Q_CC_CLANG) && !__has_feature(cxx_exceptions)) || \
         (defined(Q_CC_GNU) && !defined(__EXCEPTIONS))
 #      define QT_NO_EXCEPTIONS
 #    endif
diff --git a/src/corelib/global/qlibraryinfo.cpp b/src/corelib/global/qlibraryinfo.cpp
index b3ea6f8756..353d4bdf95 100644
--- a/src/corelib/global/qlibraryinfo.cpp
+++ b/src/corelib/global/qlibraryinfo.cpp
@@ -207,37 +207,7 @@ static bool havePaths() {
 QLibraryInfo::QLibraryInfo()
 { }
 
-#if defined(Q_CC_INTEL) // must be before GNU, Clang and MSVC because ICC/ICL claim to be them
-#  ifdef __INTEL_CLANG_COMPILER
-#    define ICC_COMPAT "Clang"
-#  elif defined(__INTEL_MS_COMPAT_LEVEL)
-#    define ICC_COMPAT "Microsoft"
-#  elif defined(__GNUC__)
-#    define ICC_COMPAT "GCC"
-#  else
-#    define ICC_COMPAT "no"
-#  endif
-#  if __INTEL_COMPILER == 1300
-#    define ICC_VERSION "13.0"
-#  elif __INTEL_COMPILER == 1310
-#    define ICC_VERSION "13.1"
-#  elif __INTEL_COMPILER == 1400
-#    define ICC_VERSION "14.0"
-#  elif __INTEL_COMPILER == 1500
-#    define ICC_VERSION "15.0"
-#  else
-#    define ICC_VERSION QT_STRINGIFY(__INTEL_COMPILER)
-#  endif
-#  ifdef __INTEL_COMPILER_UPDATE
-#    define COMPILER_STRING "Intel(R) C++ " ICC_VERSION "." QT_STRINGIFY(__INTEL_COMPILER_UPDATE) \
-                            " build " QT_STRINGIFY(__INTEL_COMPILER_BUILD_DATE) " [" \
-                            ICC_COMPAT " compatibility]"
-#  else
-#    define COMPILER_STRING "Intel(R) C++ " ICC_VERSION \
-                            " build " QT_STRINGIFY(__INTEL_COMPILER_BUILD_DATE) " [" \
-                            ICC_COMPAT " compatibility]"
-#  endif
-#elif defined(Q_CC_CLANG) // must be before GNU, because clang claims to be GNU too
+#if defined(Q_CC_CLANG) // must be before GNU, because clang claims to be GNU too
 #  ifdef __apple_build_version__ // Apple clang has other version numbers
 #    define COMPILER_STRING "Clang " __clang_version__ " (Apple)"
 #  else
diff --git a/src/corelib/global/qnumeric.h b/src/corelib/global/qnumeric.h
index a40c95b637..d625b11a50 100644
--- a/src/corelib/global/qnumeric.h
+++ b/src/corelib/global/qnumeric.h
@@ -114,11 +114,9 @@ Q_CORE_EXPORT quint64 qFloatDistance(double a, double b);
 // size_t. Implementations for 8- and 16-bit types will work but may not be as
 // efficient. Implementations for 64-bit may be missing on 32-bit platforms.
 
-#if (((defined(Q_CC_INTEL) ? (Q_CC_INTEL >= 1800 && !defined(Q_OS_WIN)) : defined(Q_CC_GNU)) \
-      && Q_CC_GNU >= 500) \
-     || __has_builtin(__builtin_add_overflow)) \
+#if (Q_CC_GNU >= 500 || __has_builtin(__builtin_add_overflow)) \
     && !(QT_POINTER_SIZE == 4 && defined(Q_CC_CLANG))
-// GCC 5, ICC 18, and Clang 3.8 have builtins to detect overflows
+// GCC 5 and Clang 3.8 have builtins to detect overflows
 // 32 bit Clang has the builtins but tries to link a library which hasn't
 #define Q_INTRINSIC_MUL_OVERFLOW64
 
diff --git a/src/corelib/global/qnumeric_p.h b/src/corelib/global/qnumeric_p.h
index f224f9848c..7e73439a10 100644
--- a/src/corelib/global/qnumeric_p.h
+++ b/src/corelib/global/qnumeric_p.h
@@ -59,7 +59,7 @@
 #include <limits>
 #include <type_traits>
 
-#if !defined(Q_CC_MSVC) && (defined(Q_OS_QNX) || defined(Q_CC_INTEL))
+#if !defined(Q_CC_MSVC) && defined(Q_OS_QNX)
 #  include <math.h>
 #  ifdef isnan
 #    define QT_MATH_H_DEFINES_MACROS
diff --git a/src/corelib/global/qsimd_p.h b/src/corelib/global/qsimd_p.h
index 153eebf2b3..19119749d7 100644
--- a/src/corelib/global/qsimd_p.h
+++ b/src/corelib/global/qsimd_p.h
@@ -185,7 +185,7 @@ QT_WARNING_DISABLE_INTEL(103)
 #  else
 #    define QT_COMPILER_SUPPORTS_HERE(x)    ((__ ## x ## __) || QT_COMPILER_SUPPORTS(x))
 #  endif
-#  if defined(Q_CC_GNU) && !defined(Q_CC_INTEL)
+#  if defined(Q_CC_GNU)
      /* GCC requires attributes for a function */
 #    define QT_FUNCTION_TARGET(x)  __attribute__((__target__(QT_FUNCTION_TARGET_STRING_ ## x)))
 #  else
@@ -204,7 +204,7 @@ QT_WARNING_DISABLE_INTEL(103)
 #    define __SSE__                         1
 #  endif
 
-#  if defined(Q_OS_WIN) && defined(Q_CC_GNU) && !defined(Q_CC_INTEL) && !defined(Q_CC_CLANG)
+#  if defined(Q_OS_WIN) && defined(Q_CC_GNU) && !defined(Q_CC_CLANG)
 // 64-bit GCC on Windows does not support AVX, so we hack around it by forcing
 // it to emit unaligned loads & stores
 // See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49001
@@ -227,7 +227,7 @@ asm(
 );
 #  endif
 
-#  if defined(Q_CC_GNU) && !defined(Q_CC_INTEL) && !defined(Q_OS_WASM)
+#  if defined(Q_CC_GNU) && !defined(Q_OS_WASM)
 // GCC 4.4 and Clang 2.8 added a few more intrinsics there
 #    include <x86intrin.h>
 #  endif
diff --git a/src/corelib/kernel/qtmetamacros.h b/src/corelib/kernel/qtmetamacros.h
index 89f51e97b6..eca08fbec0 100644
--- a/src/corelib/kernel/qtmetamacros.h
+++ b/src/corelib/kernel/qtmetamacros.h
@@ -129,12 +129,7 @@ QT_BEGIN_NAMESPACE
 #define QT_TR_FUNCTIONS
 #endif
 
-#if defined(Q_CC_INTEL)
-// Cannot redefine the visibility of a method in an exported class
-# define Q_DECL_HIDDEN_STATIC_METACALL
-#else
-# define Q_DECL_HIDDEN_STATIC_METACALL Q_DECL_HIDDEN
-#endif
+#define Q_DECL_HIDDEN_STATIC_METACALL Q_DECL_HIDDEN
 
 #if defined(Q_CC_CLANG)
 #  if Q_CC_CLANG >= 1100
@@ -142,13 +137,13 @@ QT_BEGIN_NAMESPACE
 #  elif Q_CC_CLANG >= 306
 #    define Q_OBJECT_NO_OVERRIDE_WARNING    QT_WARNING_DISABLE_CLANG("-Winconsistent-missing-override")
 #  endif
-#elif defined(Q_CC_GNU) && !defined(Q_CC_INTEL) && Q_CC_GNU >= 501
+#elif defined(Q_CC_GNU) && Q_CC_GNU >= 501
 #  define Q_OBJECT_NO_OVERRIDE_WARNING      QT_WARNING_DISABLE_GCC("-Wsuggest-override")
 #else
 #  define Q_OBJECT_NO_OVERRIDE_WARNING
 #endif
 
-#if defined(Q_CC_GNU) && !defined(Q_CC_INTEL) && Q_CC_GNU >= 600
+#if defined(Q_CC_GNU) && Q_CC_GNU >= 600
 #  define Q_OBJECT_NO_ATTRIBUTES_WARNING    QT_WARNING_DISABLE_GCC("-Wattributes")
 #else
 #  define Q_OBJECT_NO_ATTRIBUTES_WARNING
diff --git a/src/corelib/text/qanystringview.h b/src/corelib/text/qanystringview.h
index 102a5b63ae..65b74c4664 100644
--- a/src/corelib/text/qanystringview.h
+++ b/src/corelib/text/qanystringview.h
@@ -123,7 +123,7 @@ private:
     template <typename Char>
     static qsizetype lengthHelperPointer(const Char *str) noexcept
     {
-#if defined(Q_CC_GNU) && !defined(Q_CC_CLANG) && !defined(Q_CC_INTEL)
+#if defined(Q_CC_GNU) && !defined(Q_CC_CLANG)
         if (__builtin_constant_p(*str)) {
             qsizetype result = 0;
             while (*str++ != u'\0')
diff --git a/src/corelib/text/qstring.cpp b/src/corelib/text/qstring.cpp
index acf02832da..00e12fe35d 100644
--- a/src/corelib/text/qstring.cpp
+++ b/src/corelib/text/qstring.cpp
@@ -360,7 +360,7 @@ extern "C" void qt_fromlatin1_mips_asm_unroll8 (char16_t*, const char*, uint);
 extern "C" void qt_toLatin1_mips_dsp_asm(uchar *dst, const char16_t *src, int length);
 #endif
 
-#if defined(__SSE2__) && defined(Q_CC_GNU) && !defined(Q_CC_INTEL)
+#if defined(__SSE2__) && defined(Q_CC_GNU)
 #  if defined(__SANITIZE_ADDRESS__) && Q_CC_GNU < 800 && !defined(Q_CC_CLANG)
 #     warning "The __attribute__ on below will likely cause a build failure with your GCC version. Your choices are:"
 #     warning "1) disable ASan;"
diff --git a/src/corelib/text/qstringview.h b/src/corelib/text/qstringview.h
index 194a8280c9..3c1f852c27 100644
--- a/src/corelib/text/qstringview.h
+++ b/src/corelib/text/qstringview.h
@@ -154,7 +154,7 @@ private:
 #if defined(__cpp_lib_is_constant_evaluated)
         if (std::is_constant_evaluated())
             return std::char_traits<Char>::length(str);
-#elif defined(Q_CC_GNU) && !defined(Q_CC_CLANG) && !defined(Q_CC_INTEL)
+#elif defined(Q_CC_GNU) && !defined(Q_CC_CLANG)
         if (__builtin_constant_p(*str))
             return std::char_traits<Char>::length(str);
 #endif
diff --git a/src/corelib/tools/qalgorithms.h b/src/corelib/tools/qalgorithms.h
index a72215e8d6..86b91331d8 100644
--- a/src/corelib/tools/qalgorithms.h
+++ b/src/corelib/tools/qalgorithms.h
@@ -78,7 +78,7 @@ namespace QAlgorithmsPrivate {
 #  if (defined __apple_build_version__ &&  __clang_major__ >= 7) || (Q_CC_CLANG >= 307)
 #    define QT_HAS_CONSTEXPR_BUILTINS
 #  endif
-#elif defined(Q_CC_MSVC) && !defined(Q_CC_INTEL) && !defined(Q_PROCESSOR_ARM)
+#elif defined(Q_CC_MSVC) && !defined(Q_PROCESSOR_ARM)
 #  define QT_HAS_CONSTEXPR_BUILTINS
 #elif defined(Q_CC_GNU)
 #  define QT_HAS_CONSTEXPR_BUILTINS