Fixing compatibility with Qt 5.6.

src/libs/vmisc/compatibility.h

@@ -54,6 +54,26 @@
 
 class QPointF;
 
+#if QT_VERSION < QT_VERSION_CHECK(5, 8, 0)
+//---------------------------------------------------------------------------------------------------------------------
+inline bool operator==(QChar lhs, const QString &rhs) Q_DECL_NOEXCEPT
+{
+    return rhs.size() == 1 && lhs == rhs[0];
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+inline bool operator!=(QChar lhs, const QString &rhs) Q_DECL_NOEXCEPT
+{
+    return !(lhs == rhs);
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+inline bool operator==(const QString &lhs, QChar rhs) Q_DECL_NOEXCEPT
+{
+    return rhs == lhs;
+}
+#endif
+
 #if QT_VERSION < QT_VERSION_CHECK(6, 4, 0)
 namespace Qt
 {
@@ -63,25 +83,25 @@ inline namespace StringLiterals
 {
 
 //---------------------------------------------------------------------------------------------------------------------
-constexpr inline auto operator"" _L1(char ch) noexcept -> QLatin1Char
+Q_DECL_CONSTEXPR inline auto operator"" _L1(char ch) Q_DECL_NOEXCEPT->QLatin1Char
 {
     return QLatin1Char(ch);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-constexpr inline auto operator"" _L1(const char *str, size_t size) noexcept -> QLatin1String
+Q_DECL_CONSTEXPR inline auto operator"" _L1(const char *str, size_t size) Q_DECL_NOEXCEPT->QLatin1String
 {
     return QLatin1String(str, static_cast<vsizetype>(size));
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-inline auto operator"" _ba(const char *str, size_t size) noexcept -> QByteArray
+inline auto operator"" _ba(const char *str, size_t size) Q_DECL_NOEXCEPT->QByteArray
 {
     return {str, static_cast<vsizetype>(size)};
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-inline auto operator"" _s(const char16_t *str, size_t size) noexcept -> QString
+inline auto operator"" _s(const char16_t *str, size_t size) Q_DECL_NOEXCEPT->QString
 {
     return QString::fromUtf16(str, static_cast<vsizetype>(size));
 }