diff --git a/src/corelib/text/qbytearrayview.h b/src/corelib/text/qbytearrayview.h
index 85a68b14b2..90454f1c93 100644
--- a/src/corelib/text/qbytearrayview.h
+++ b/src/corelib/text/qbytearrayview.h
@@ -168,6 +168,9 @@ public:
     constexpr QByteArrayView(const char (&data)[Size]) noexcept
         : QByteArrayView(data, lengthHelperCharArray(data, Size)) {}
 
+    constexpr QByteArrayView(QLatin1StringView v) noexcept; // defined in qlatin1stringview.h
+    constexpr QByteArrayView(QUtf8StringView v) noexcept; // defined in qutf8stringview.h
+
 #ifdef Q_QDOC
     template <typename Byte, size_t Size>
 #else
@@ -326,13 +329,13 @@ private:
         Q_ASSERT(n <= size() - pos);
     }
 
-    static inline bool
+    friend bool
     comparesEqual(const QByteArrayView &lhs, const QByteArrayView &rhs) noexcept
     {
         return lhs.size() == rhs.size()
                 && (!lhs.size() || memcmp(lhs.data(), rhs.data(), lhs.size()) == 0);
     }
-    static inline Qt::strong_ordering
+    friend Qt::strong_ordering
     compareThreeWay(const QByteArrayView &lhs, const QByteArrayView &rhs) noexcept
     {
         const int res = QtPrivate::compareMemory(lhs, rhs);
@@ -340,20 +343,22 @@ private:
     }
     Q_DECLARE_STRONGLY_ORDERED(QByteArrayView)
 
-    static inline bool comparesEqual(const QByteArrayView &lhs, const char *rhs) noexcept
+    friend bool comparesEqual(const QByteArrayView &lhs, const char *rhs) noexcept
     { return comparesEqual(lhs, QByteArrayView(rhs)); }
-    static inline Qt::strong_ordering
+    friend Qt::strong_ordering
     compareThreeWay(const QByteArrayView &lhs, const char *rhs) noexcept
     { return compareThreeWay(lhs, QByteArrayView(rhs)); }
     Q_DECLARE_STRONGLY_ORDERED(QByteArrayView, const char *)
 
     // defined in qstring.cpp
-    static bool
+    friend Q_CORE_EXPORT bool
     comparesEqual(const QByteArrayView &lhs, const QChar &rhs) noexcept;
-    static Qt::strong_ordering
+    friend Q_CORE_EXPORT Qt::strong_ordering
     compareThreeWay(const QByteArrayView &lhs, const QChar &rhs) noexcept;
-    static bool comparesEqual(const QByteArrayView &lhs, char16_t rhs) noexcept;
-    static Qt::strong_ordering compareThreeWay(const QByteArrayView &lhs, char16_t rhs) noexcept;
+    friend Q_CORE_EXPORT bool
+    comparesEqual(const QByteArrayView &lhs, char16_t rhs) noexcept;
+    friend Q_CORE_EXPORT Qt::strong_ordering
+    compareThreeWay(const QByteArrayView &lhs, char16_t rhs) noexcept;
 #if !defined(QT_NO_CAST_FROM_ASCII) && !defined(QT_RESTRICTED_CAST_FROM_ASCII)
     Q_DECLARE_STRONGLY_ORDERED(QByteArrayView, QChar, QT_ASCII_CAST_WARN)
     Q_DECLARE_STRONGLY_ORDERED(QByteArrayView, char16_t, QT_ASCII_CAST_WARN)
diff --git a/src/corelib/text/qlatin1stringview.h b/src/corelib/text/qlatin1stringview.h
index daff68d440..fd4f046971 100644
--- a/src/corelib/text/qlatin1stringview.h
+++ b/src/corelib/text/qlatin1stringview.h
@@ -330,6 +330,10 @@ Q_DECLARE_TYPEINFO(QLatin1StringView, Q_RELOCATABLE_TYPE);
 Q_DECLARE_TYPEINFO(QLatin1String, Q_RELOCATABLE_TYPE);
 #endif
 
+constexpr QByteArrayView::QByteArrayView(QLatin1StringView v) noexcept
+    : QByteArrayView(v.data(), v.size())
+{}
+
 namespace Qt {
 inline namespace Literals {
 inline namespace StringLiterals {
diff --git a/src/corelib/text/qstring.cpp b/src/corelib/text/qstring.cpp
index 716b5823fb..24aa41b1ab 100644
--- a/src/corelib/text/qstring.cpp
+++ b/src/corelib/text/qstring.cpp
@@ -6718,25 +6718,23 @@ int QString::compare_helper(const QChar *data1, qsizetype length1, const char *d
   \overload compare()
 */
 
-bool QByteArrayView::comparesEqual(const QByteArrayView &lhs, const QChar &rhs) noexcept
+bool comparesEqual(const QByteArrayView &lhs, const QChar &rhs) noexcept
 {
     return QtPrivate::equalStrings(QUtf8StringView(lhs), QStringView(&rhs, 1));
 }
 
-Qt::strong_ordering QByteArrayView::compareThreeWay(const QByteArrayView &lhs,
-                                                    const QChar &rhs) noexcept
+Qt::strong_ordering compareThreeWay(const QByteArrayView &lhs, const QChar &rhs) noexcept
 {
     const int res = QtPrivate::compareStrings(QUtf8StringView(lhs), QStringView(&rhs, 1));
     return Qt::compareThreeWay(res, 0);
 }
 
-bool QByteArrayView::comparesEqual(const QByteArrayView &lhs, char16_t rhs) noexcept
+bool comparesEqual(const QByteArrayView &lhs, char16_t rhs) noexcept
 {
     return QtPrivate::equalStrings(QUtf8StringView(lhs), QStringView(&rhs, 1));
 }
 
-Qt::strong_ordering QByteArrayView::compareThreeWay(const QByteArrayView &lhs,
-                                                    char16_t rhs) noexcept
+Qt::strong_ordering compareThreeWay(const QByteArrayView &lhs, char16_t rhs) noexcept
 {
     const int res = QtPrivate::compareStrings(QUtf8StringView(lhs), QStringView(&rhs, 1));
     return Qt::compareThreeWay(res, 0);
diff --git a/src/corelib/text/qutf8stringview.h b/src/corelib/text/qutf8stringview.h
index 972473794e..fe105e283e 100644
--- a/src/corelib/text/qutf8stringview.h
+++ b/src/corelib/text/qutf8stringview.h
@@ -414,6 +414,10 @@ private:
     qsizetype m_size;
 };
 
+constexpr QByteArrayView::QByteArrayView(QUtf8StringView v) noexcept
+    : QByteArrayView(v.data(), v.size())
+{}
+
 #ifdef Q_QDOC
 #undef QBasicUtf8StringView
 #else