3 files changed, 7 insertions, 15 deletions
diff --git a/src/corelib/text/qanystringview.h b/src/corelib/text/qanystringview.h
index b7f3650275f..01efd83743d 100644
--- a/src/corelib/text/qanystringview.h
+++ b/src/corelib/text/qanystringview.h
@@ -102,12 +102,7 @@ private:
     static constexpr bool isAsciiOnlyCharsAtCompileTime(Char *str, qsizetype sz) noexcept
     {
         // do not perform check if not at compile time
-#if !defined(QT_SUPPORTS_IS_CONSTANT_EVALUATED)
-        Q_UNUSED(str);
-        Q_UNUSED(sz);
-        return false;
-#else
-        if (!qIsConstantEvaluated())
+        if (!q20::is_constant_evaluated())
             return false;
         if constexpr (sizeof(Char) != sizeof(char)) {
             Q_UNUSED(str);
@@ -120,7 +115,6 @@ private:
             }
             return true;
         }
-#endif
     }
 
     template<typename Char>
@@ -138,10 +132,8 @@ private:
     template <typename Char>
     static constexpr qsizetype lengthHelperPointer(const Char *str) noexcept
     {
-#ifdef QT_SUPPORTS_IS_CONSTANT_EVALUATED
-        if (qIsConstantEvaluated())
+        if (q20::is_constant_evaluated())
             return qsizetype(std::char_traits<Char>::length(str));
-#endif
         if constexpr (sizeof(Char) == sizeof(char16_t))
             return QtPrivate::qustrlen(reinterpret_cast<const char16_t*>(str));
         else
diff --git a/src/corelib/text/qstringalgorithms.h b/src/corelib/text/qstringalgorithms.h
index 320a08737d8..84c104eafdb 100644
--- a/src/corelib/text/qstringalgorithms.h
+++ b/src/corelib/text/qstringalgorithms.h
@@ -16,6 +16,8 @@
 
 #include <string.h>         // for memchr
 
+#include <QtCore/q20type_traits.h>      // q20::is_constant_evaluated
+
 QT_BEGIN_NAMESPACE
 
 namespace QtPrivate {
@@ -169,7 +171,7 @@ lengthHelperContainer(const Char (&str)[N])
         return str[0] == Char(0) ? 0 : 1;
     } else if constexpr (N > RuntimeThreshold) {
 #ifdef QT_SUPPORTS_IS_CONSTANT_EVALUATED
-        if (!qIsConstantEvaluated())
+        if (!q20::is_constant_evaluated())
             return QtPrivate::qustrnlen(reinterpret_cast<const char16_t *>(str), N);
 #endif
     }
@@ -181,7 +183,7 @@ template <typename Char, size_t N> [[nodiscard]] constexpr inline
 std::enable_if_t<sizeof(Char) == 1, qsizetype> lengthHelperContainer(const Char (&str)[N])
 {
 #ifdef QT_SUPPORTS_IS_CONSTANT_EVALUATED
-    if (!qIsConstantEvaluated())
+    if (!q20::is_constant_evaluated())
         return qstrnlen(reinterpret_cast<const char *>(str), N);
 #endif
 
diff --git a/src/corelib/text/qstringview.h b/src/corelib/text/qstringview.h
index 048c1b005d6..742ecadcf5d 100644
--- a/src/corelib/text/qstringview.h
+++ b/src/corelib/text/qstringview.h
@@ -104,10 +104,8 @@ private:
     template <typename Char>
     static constexpr qsizetype lengthHelperPointer(const Char *str) noexcept
     {
-#if defined(QT_SUPPORTS_IS_CONSTANT_EVALUATED)
-        if (qIsConstantEvaluated())
+        if (q20::is_constant_evaluated())
             return std::char_traits<Char>::length(str);
-#endif
         return QtPrivate::qustrlen(reinterpret_cast<const char16_t *>(str));
     }
     static qsizetype lengthHelperPointer(const QChar *str) noexcept