18 files changed, 193 insertions, 193 deletions

diff --git a/src/gui/painting/qbrush.h b/src/gui/painting/qbrush.h
index aee51c526d..27d710eca6 100644
--- a/src/gui/painting/qbrush.h
+++ b/src/gui/painting/qbrush.h
@@ -80,10 +80,10 @@ public:
     ~QBrush();
     QBrush &operator=(const QBrush &brush);
 #ifdef Q_COMPILER_RVALUE_REFS
-    inline QBrush &operator=(QBrush &&other) Q_DECL_NOEXCEPT
+    inline QBrush &operator=(QBrush &&other) noexcept
     { qSwap(d, other.d); return *this; }
 #endif
-    inline void swap(QBrush &other) Q_DECL_NOEXCEPT
+    inline void swap(QBrush &other) noexcept
     { qSwap(d, other.d); }
 
     operator QVariant() const;
diff --git a/src/gui/painting/qcolor.cpp b/src/gui/painting/qcolor.cpp
index 07202f5b1c..bb42660cf2 100644
--- a/src/gui/painting/qcolor.cpp
+++ b/src/gui/painting/qcolor.cpp
@@ -653,7 +653,7 @@ static QStringList get_colornames()
 
     \sa isValid(), {QColor#Predefined Colors}{Predefined Colors}
  */
-QColor::QColor(Qt::GlobalColor color) Q_DECL_NOTHROW
+QColor::QColor(Qt::GlobalColor color) noexcept
 {
 #define QRGB(r, g, b) \
     QRgb(((0xffu << 24) | ((r & 0xff) << 16) | ((g & 0xff) << 8) | (b & 0xff)))
@@ -728,7 +728,7 @@ QColor::QColor(Qt::GlobalColor color) Q_DECL_NOTHROW
     \sa fromRgb(), isValid()
 */
 
-QColor::QColor(QRgb color) Q_DECL_NOTHROW
+QColor::QColor(QRgb color) noexcept
 {
     cspec = Rgb;
     ct.argb.alpha = 0xffff;
@@ -746,7 +746,7 @@ QColor::QColor(QRgb color) Q_DECL_NOTHROW
     \sa fromRgba64()
 */
 
-QColor::QColor(QRgba64 rgba64) Q_DECL_NOTHROW
+QColor::QColor(QRgba64 rgba64) noexcept
 {
     setRgba64(rgba64);
 }
@@ -760,7 +760,7 @@ QColor::QColor(QRgba64 rgba64) Q_DECL_NOTHROW
     becomes a valid color by accident.
 */
 
-QColor::QColor(Spec spec) Q_DECL_NOTHROW
+QColor::QColor(Spec spec) noexcept
 {
     switch (spec) {
     case Invalid:
@@ -933,7 +933,7 @@ bool QColor::isValidColor(const QString &name)
     \overload
     \since 5.10
 */
-bool QColor::isValidColor(QStringView name) Q_DECL_NOTHROW
+bool QColor::isValidColor(QStringView name) noexcept
 {
     return name.size() && QColor().setColorFromString(name);
 }
@@ -942,7 +942,7 @@ bool QColor::isValidColor(QStringView name) Q_DECL_NOTHROW
     \overload
     \since 5.8
 */
-bool QColor::isValidColor(QLatin1String name) Q_DECL_NOTHROW
+bool QColor::isValidColor(QLatin1String name) noexcept
 {
     return name.size() && QColor().setColorFromString(name);
 }
@@ -1330,7 +1330,7 @@ void QColor::setRgb(int r, int g, int b, int a)
     \sa setRgba(), rgb(), rgba64()
 */
 
-QRgb QColor::rgba() const Q_DECL_NOTHROW
+QRgb QColor::rgba() const noexcept
 {
     if (cspec != Invalid && cspec != Rgb)
         return toRgb().rgba();
@@ -1342,7 +1342,7 @@ QRgb QColor::rgba() const Q_DECL_NOTHROW
 
     \sa rgba(), rgb(), setRgba64()
 */
-void QColor::setRgba(QRgb rgba) Q_DECL_NOTHROW
+void QColor::setRgba(QRgb rgba) noexcept
 {
     cspec = Rgb;
     ct.argb.alpha = qAlpha(rgba) * 0x101;
@@ -1362,7 +1362,7 @@ void QColor::setRgba(QRgb rgba) Q_DECL_NOTHROW
     \sa setRgba64(), rgba(), rgb()
 */
 
-QRgba64 QColor::rgba64() const Q_DECL_NOTHROW
+QRgba64 QColor::rgba64() const noexcept
 {
     if (cspec != Invalid && cspec != Rgb)
         return toRgb().rgba64();
@@ -1376,7 +1376,7 @@ QRgba64 QColor::rgba64() const Q_DECL_NOTHROW
 
     \sa setRgba(), rgba64()
 */
-void QColor::setRgba64(QRgba64 rgba) Q_DECL_NOTHROW
+void QColor::setRgba64(QRgba64 rgba) noexcept
 {
     cspec = Rgb;
     ct.argb.alpha = rgba.alpha();
@@ -1393,7 +1393,7 @@ void QColor::setRgba64(QRgba64 rgba) Q_DECL_NOTHROW
 
     \sa getRgb(), rgba()
 */
-QRgb QColor::rgb() const Q_DECL_NOTHROW
+QRgb QColor::rgb() const noexcept
 {
     if (cspec != Invalid && cspec != Rgb)
         return toRgb().rgb();
@@ -1405,7 +1405,7 @@ QRgb QColor::rgb() const Q_DECL_NOTHROW
 
     Sets the RGB value to \a rgb. The alpha value is set to opaque.
 */
-void QColor::setRgb(QRgb rgb) Q_DECL_NOTHROW
+void QColor::setRgb(QRgb rgb) noexcept
 {
     cspec = Rgb;
     ct.argb.alpha = 0xffff;
@@ -1420,7 +1420,7 @@ void QColor::setRgb(QRgb rgb) Q_DECL_NOTHROW
 
     \sa setAlpha(), alphaF(), {QColor#Alpha-Blended Drawing}{Alpha-Blended Drawing}
 */
-int QColor::alpha() const Q_DECL_NOTHROW
+int QColor::alpha() const noexcept
 { return ct.argb.alpha >> 8; }
 
 
@@ -1442,7 +1442,7 @@ void QColor::setAlpha(int alpha)
 
     \sa setAlphaF(), alpha(), {QColor#Alpha-Blended Drawing}{Alpha-Blended Drawing}
 */
-qreal QColor::alphaF() const Q_DECL_NOTHROW
+qreal QColor::alphaF() const noexcept
 { return ct.argb.alpha / qreal(USHRT_MAX); }
 
 /*!
@@ -1465,7 +1465,7 @@ void QColor::setAlphaF(qreal alpha)
 
     \sa setRed(), redF(), getRgb()
 */
-int QColor::red() const Q_DECL_NOTHROW
+int QColor::red() const noexcept
 {
     if (cspec != Invalid && cspec != Rgb)
         return toRgb().red();
@@ -1492,7 +1492,7 @@ void QColor::setRed(int red)
 
     \sa setGreen(), greenF(), getRgb()
 */
-int QColor::green() const Q_DECL_NOTHROW
+int QColor::green() const noexcept
 {
     if (cspec != Invalid && cspec != Rgb)
         return toRgb().green();
@@ -1520,7 +1520,7 @@ void QColor::setGreen(int green)
 
     \sa setBlue(), blueF(), getRgb()
 */
-int QColor::blue() const Q_DECL_NOTHROW
+int QColor::blue() const noexcept
 {
     if (cspec != Invalid && cspec != Rgb)
         return toRgb().blue();
@@ -1548,7 +1548,7 @@ void QColor::setBlue(int blue)
 
     \sa setRedF(), red(), getRgbF()
 */
-qreal QColor::redF() const Q_DECL_NOTHROW
+qreal QColor::redF() const noexcept
 {
     if (cspec != Invalid && cspec != Rgb)
         return toRgb().redF();
@@ -1576,7 +1576,7 @@ void QColor::setRedF(qreal red)
 
     \sa setGreenF(), green(), getRgbF()
 */
-qreal QColor::greenF() const Q_DECL_NOTHROW
+qreal QColor::greenF() const noexcept
 {
     if (cspec != Invalid && cspec != Rgb)
         return toRgb().greenF();
@@ -1604,7 +1604,7 @@ void QColor::setGreenF(qreal green)
 
      \sa setBlueF(), blue(), getRgbF()
 */
-qreal QColor::blueF() const Q_DECL_NOTHROW
+qreal QColor::blueF() const noexcept
 {
     if (cspec != Invalid && cspec != Rgb)
         return toRgb().blueF();
@@ -1634,7 +1634,7 @@ void QColor::setBlueF(qreal blue)
     \sa hsvHue(), hslHue(), hueF(), getHsv(), {QColor#The HSV Color Model}{The HSV Color Model}
 */
 
-int QColor::hue() const Q_DECL_NOTHROW
+int QColor::hue() const noexcept
 {
     return hsvHue();
 }
@@ -1644,7 +1644,7 @@ int QColor::hue() const Q_DECL_NOTHROW
 
     \sa hueF(), hslHue(), getHsv(), {QColor#The HSV Color Model}{The HSV Color Model}
 */
-int QColor::hsvHue() const Q_DECL_NOTHROW
+int QColor::hsvHue() const noexcept
 {
     if (cspec != Invalid && cspec != Hsv)
         return toHsv().hue();
@@ -1660,7 +1660,7 @@ int QColor::hsvHue() const Q_DECL_NOTHROW
     Model}
 */
 
-int QColor::saturation() const Q_DECL_NOTHROW
+int QColor::saturation() const noexcept
 {
     return hsvSaturation();
 }
@@ -1670,7 +1670,7 @@ int QColor::saturation() const Q_DECL_NOTHROW
 
     \sa saturationF(), hslSaturation(), getHsv(), {QColor#The HSV Color Model}{The HSV Color Model}
 */
-int QColor::hsvSaturation() const Q_DECL_NOTHROW
+int QColor::hsvSaturation() const noexcept
 {
     if (cspec != Invalid && cspec != Hsv)
         return toHsv().saturation();
@@ -1682,7 +1682,7 @@ int QColor::hsvSaturation() const Q_DECL_NOTHROW
 
     \sa valueF(), getHsv(), {QColor#The HSV Color Model}{The HSV Color Model}
 */
-int QColor::value() const Q_DECL_NOTHROW
+int QColor::value() const noexcept
 {
     if (cspec != Invalid && cspec != Hsv)
         return toHsv().value();
@@ -1696,7 +1696,7 @@ int QColor::value() const Q_DECL_NOTHROW
 
     \sa hsvHueF(), hslHueF(), hue(), getHsvF(), {QColor#The HSV Color Model}{The HSV Color Model}
 */
-qreal QColor::hueF() const Q_DECL_NOTHROW
+qreal QColor::hueF() const noexcept
 {
     return hsvHueF();
 }
@@ -1707,7 +1707,7 @@ qreal QColor::hueF() const Q_DECL_NOTHROW
     \sa hue(), hslHueF(), getHsvF(), {QColor#The HSV Color Model}{The HSV Color
     Model}
 */
-qreal QColor::hsvHueF() const Q_DECL_NOTHROW
+qreal QColor::hsvHueF() const noexcept
 {
     if (cspec != Invalid && cspec != Hsv)
         return toHsv().hueF();
@@ -1722,7 +1722,7 @@ qreal QColor::hsvHueF() const Q_DECL_NOTHROW
     \sa hsvSaturationF(), hslSaturationF(), saturation(), getHsvF(), {QColor#The HSV Color Model}{The HSV Color
     Model}
 */
-qreal QColor::saturationF() const Q_DECL_NOTHROW
+qreal QColor::saturationF() const noexcept
 {
     return hsvSaturationF();
 }
@@ -1732,7 +1732,7 @@ qreal QColor::saturationF() const Q_DECL_NOTHROW
 
     \sa saturation(), hslSaturationF(), getHsvF(), {QColor#The HSV Color Model}{The HSV Color Model}
 */
-qreal QColor::hsvSaturationF() const Q_DECL_NOTHROW
+qreal QColor::hsvSaturationF() const noexcept
 {
     if (cspec != Invalid && cspec != Hsv)
         return toHsv().saturationF();
@@ -1744,7 +1744,7 @@ qreal QColor::hsvSaturationF() const Q_DECL_NOTHROW
 
     \sa value(), getHsvF(), {QColor#The HSV Color Model}{The HSV Color Model}
 */
-qreal QColor::valueF() const Q_DECL_NOTHROW
+qreal QColor::valueF() const noexcept
 {
     if (cspec != Invalid && cspec != Hsv)
         return toHsv().valueF();
@@ -1758,7 +1758,7 @@ qreal QColor::valueF() const Q_DECL_NOTHROW
 
     \sa hslHueF(), hsvHue(), getHsl(), {QColor#The HSL Color Model}{The HSL Color Model}
 */
-int QColor::hslHue() const Q_DECL_NOTHROW
+int QColor::hslHue() const noexcept
 {
     if (cspec != Invalid && cspec != Hsl)
         return toHsl().hslHue();
@@ -1772,7 +1772,7 @@ int QColor::hslHue() const Q_DECL_NOTHROW
 
     \sa hslSaturationF(), hsvSaturation(), getHsl(), {QColor#The HSL Color Model}{The HSL Color Model}
 */
-int QColor::hslSaturation() const Q_DECL_NOTHROW
+int QColor::hslSaturation() const noexcept
 {
     if (cspec != Invalid && cspec != Hsl)
         return toHsl().hslSaturation();
@@ -1786,7 +1786,7 @@ int QColor::hslSaturation() const Q_DECL_NOTHROW
 
     \sa lightnessF(), getHsl()
 */
-int QColor::lightness() const Q_DECL_NOTHROW
+int QColor::lightness() const noexcept
 {
     if (cspec != Invalid && cspec != Hsl)
         return toHsl().lightness();
@@ -1800,7 +1800,7 @@ int QColor::lightness() const Q_DECL_NOTHROW
 
     \sa hslHue(), hsvHueF(), getHslF()
 */
-qreal QColor::hslHueF() const Q_DECL_NOTHROW
+qreal QColor::hslHueF() const noexcept
 {
     if (cspec != Invalid && cspec != Hsl)
         return toHsl().hslHueF();
@@ -1814,7 +1814,7 @@ qreal QColor::hslHueF() const Q_DECL_NOTHROW
 
     \sa hslSaturation(), hsvSaturationF(), getHslF(), {QColor#The HSL Color Model}{The HSL Color Model}
 */
-qreal QColor::hslSaturationF() const Q_DECL_NOTHROW
+qreal QColor::hslSaturationF() const noexcept
 {
     if (cspec != Invalid && cspec != Hsl)
         return toHsl().hslSaturationF();
@@ -1828,7 +1828,7 @@ qreal QColor::hslSaturationF() const Q_DECL_NOTHROW
 
     \sa value(), getHslF()
 */
-qreal QColor::lightnessF() const Q_DECL_NOTHROW
+qreal QColor::lightnessF() const noexcept
 {
     if (cspec != Invalid && cspec != Hsl)
         return toHsl().lightnessF();
@@ -1840,7 +1840,7 @@ qreal QColor::lightnessF() const Q_DECL_NOTHROW
 
     \sa cyanF(), getCmyk(), {QColor#The CMYK Color Model}{The CMYK Color Model}
 */
-int QColor::cyan() const Q_DECL_NOTHROW
+int QColor::cyan() const noexcept
 {
     if (cspec != Invalid && cspec != Cmyk)
         return toCmyk().cyan();
@@ -1852,7 +1852,7 @@ int QColor::cyan() const Q_DECL_NOTHROW
 
     \sa magentaF(), getCmyk(), {QColor#The CMYK Color Model}{The CMYK Color Model}
 */
-int QColor::magenta() const Q_DECL_NOTHROW
+int QColor::magenta() const noexcept
 {
     if (cspec != Invalid && cspec != Cmyk)
         return toCmyk().magenta();
@@ -1864,7 +1864,7 @@ int QColor::magenta() const Q_DECL_NOTHROW
 
     \sa yellowF(), getCmyk(), {QColor#The CMYK Color Model}{The CMYK Color Model}
 */
-int QColor::yellow() const Q_DECL_NOTHROW
+int QColor::yellow() const noexcept
 {
     if (cspec != Invalid && cspec != Cmyk)
         return toCmyk().yellow();
@@ -1877,7 +1877,7 @@ int QColor::yellow() const Q_DECL_NOTHROW
     \sa blackF(), getCmyk(), {QColor#The CMYK Color Model}{The CMYK Color Model}
 
 */
-int QColor::black() const Q_DECL_NOTHROW
+int QColor::black() const noexcept
 {
     if (cspec != Invalid && cspec != Cmyk)
         return toCmyk().black();
@@ -1889,7 +1889,7 @@ int QColor::black() const Q_DECL_NOTHROW
 
     \sa cyan(), getCmykF(), {QColor#The CMYK Color Model}{The CMYK Color Model}
 */
-qreal QColor::cyanF() const Q_DECL_NOTHROW
+qreal QColor::cyanF() const noexcept
 {
     if (cspec != Invalid && cspec != Cmyk)
         return toCmyk().cyanF();
@@ -1901,7 +1901,7 @@ qreal QColor::cyanF() const Q_DECL_NOTHROW
 
     \sa magenta(), getCmykF(), {QColor#The CMYK Color Model}{The CMYK Color Model}
 */
-qreal QColor::magentaF() const Q_DECL_NOTHROW
+qreal QColor::magentaF() const noexcept
 {
     if (cspec != Invalid && cspec != Cmyk)
         return toCmyk().magentaF();
@@ -1913,7 +1913,7 @@ qreal QColor::magentaF() const Q_DECL_NOTHROW
 
      \sa yellow(), getCmykF(), {QColor#The CMYK Color Model}{The CMYK Color Model}
 */
-qreal QColor::yellowF() const Q_DECL_NOTHROW
+qreal QColor::yellowF() const noexcept
 {
     if (cspec != Invalid && cspec != Cmyk)
         return toCmyk().yellowF();
@@ -1925,7 +1925,7 @@ qreal QColor::yellowF() const Q_DECL_NOTHROW
 
     \sa black(), getCmykF(), {QColor#The CMYK Color Model}{The CMYK Color Model}
 */
-qreal QColor::blackF() const Q_DECL_NOTHROW
+qreal QColor::blackF() const noexcept
 {
     if (cspec != Invalid && cspec != Cmyk)
         return toCmyk().blackF();
@@ -1937,7 +1937,7 @@ qreal QColor::blackF() const Q_DECL_NOTHROW
 
     \sa fromRgb(), convertTo(), isValid()
 */
-QColor QColor::toRgb() const Q_DECL_NOTHROW
+QColor QColor::toRgb() const noexcept
 {
     if (!isValid() || cspec == Rgb)
         return *this;
@@ -2083,7 +2083,7 @@ QColor QColor::toRgb() const Q_DECL_NOTHROW
 
     \sa fromHsv(), convertTo(), isValid(), {QColor#The HSV Color Model}{The HSV Color Model}
 */
-QColor QColor::toHsv() const Q_DECL_NOTHROW
+QColor QColor::toHsv() const noexcept
 {
     if (!isValid() || cspec == Hsv)
         return *this;
@@ -2134,7 +2134,7 @@ QColor QColor::toHsv() const Q_DECL_NOTHROW
 
     \sa fromHsl(), convertTo(), isValid(), {QColor#The HSL Color Model}{The HSL Color Model}
 */
-QColor QColor::toHsl() const Q_DECL_NOTHROW
+QColor QColor::toHsl() const noexcept
 {
     if (!isValid() || cspec == Hsl)
         return *this;
@@ -2190,7 +2190,7 @@ QColor QColor::toHsl() const Q_DECL_NOTHROW
 
     \sa fromCmyk(), convertTo(), isValid(), {QColor#The CMYK Color Model}{The CMYK Color Model}
 */
-QColor QColor::toCmyk() const Q_DECL_NOTHROW
+QColor QColor::toCmyk() const noexcept
 {
     if (!isValid() || cspec == Cmyk)
         return *this;
@@ -2231,7 +2231,7 @@ QColor QColor::toCmyk() const Q_DECL_NOTHROW
     return color;
 }
 
-QColor QColor::convertTo(QColor::Spec colorSpec) const Q_DECL_NOTHROW
+QColor QColor::convertTo(QColor::Spec colorSpec) const noexcept
 {
     if (colorSpec == cspec)
         return *this;
@@ -2262,7 +2262,7 @@ QColor QColor::convertTo(QColor::Spec colorSpec) const Q_DECL_NOTHROW
     \sa fromRgba(), fromRgbF(), toRgb(), isValid()
 */
 
-QColor QColor::fromRgb(QRgb rgb) Q_DECL_NOTHROW
+QColor QColor::fromRgb(QRgb rgb) noexcept
 {
     return fromRgb(qRed(rgb), qGreen(rgb), qBlue(rgb));
 }
@@ -2278,7 +2278,7 @@ QColor QColor::fromRgb(QRgb rgb) Q_DECL_NOTHROW
     \sa fromRgb(), fromRgba64(), isValid()
 */
 
-QColor QColor::fromRgba(QRgb rgba) Q_DECL_NOTHROW
+QColor QColor::fromRgba(QRgb rgba) noexcept
 {
     return fromRgb(qRed(rgba), qGreen(rgba), qBlue(rgba), qAlpha(rgba));
 }
@@ -2351,7 +2351,7 @@ QColor QColor::fromRgbF(qreal r, qreal g, qreal b, qreal a)
 
     \sa fromRgb(), fromRgbF(), toRgb(), isValid()
 */
-QColor QColor::fromRgba64(ushort r, ushort g, ushort b, ushort a) Q_DECL_NOTHROW
+QColor QColor::fromRgba64(ushort r, ushort g, ushort b, ushort a) noexcept
 {
     QColor color;
     color.setRgba64(qRgba64(r, g, b, a));
@@ -2366,7 +2366,7 @@ QColor QColor::fromRgba64(ushort r, ushort g, ushort b, ushort a) Q_DECL_NOTHROW
 
     \sa fromRgb(), fromRgbF(), toRgb(), isValid()
 */
-QColor QColor::fromRgba64(QRgba64 rgba64) Q_DECL_NOTHROW
+QColor QColor::fromRgba64(QRgba64 rgba64) noexcept
 {
     QColor color;
     color.setRgba64(rgba64);
@@ -2714,7 +2714,7 @@ QColor QColor::fromCmykF(qreal c, qreal m, qreal y, qreal k, qreal a)
 
     \sa darker(), isValid()
 */
-QColor QColor::lighter(int factor) const Q_DECL_NOTHROW
+QColor QColor::lighter(int factor) const noexcept
 {
     if (factor <= 0)                                // invalid lightness factor
         return *this;
@@ -2759,7 +2759,7 @@ QColor QColor::lighter(int factor) const Q_DECL_NOTHROW
 
     \sa lighter(), isValid()
 */
-QColor QColor::darker(int factor) const Q_DECL_NOTHROW
+QColor QColor::darker(int factor) const noexcept
 {
     if (factor <= 0)                                // invalid darkness factor
         return *this;
@@ -2779,7 +2779,7 @@ QColor QColor::darker(int factor) const Q_DECL_NOTHROW
 
     Use lighter(\a factor) instead.
 */
-QColor QColor::light(int factor) const Q_DECL_NOTHROW
+QColor QColor::light(int factor) const noexcept
 {
     return lighter(factor);
 }
@@ -2789,7 +2789,7 @@ QColor QColor::light(int factor) const Q_DECL_NOTHROW
 
     Use darker(\a factor) instead.
 */
-QColor QColor::dark(int factor) const Q_DECL_NOTHROW
+QColor QColor::dark(int factor) const noexcept
 {
     return darker(factor);
 }
@@ -2799,7 +2799,7 @@ QColor QColor::dark(int factor) const Q_DECL_NOTHROW
 /*!
     Assigns a copy of \a color to this color, and returns a reference to it.
 */
-QColor &QColor::operator=(const QColor &color) Q_DECL_NOTHROW
+QColor &QColor::operator=(const QColor &color) noexcept
 {
     cspec = color.cspec;
     ct.argb = color.ct.argb;
@@ -2810,7 +2810,7 @@ QColor &QColor::operator=(const QColor &color) Q_DECL_NOTHROW
 /*! \overload
     Assigns a copy of \a color and returns a reference to this color.
  */
-QColor &QColor::operator=(Qt::GlobalColor color) Q_DECL_NOTHROW
+QColor &QColor::operator=(Qt::GlobalColor color) noexcept
 {
     return operator=(QColor(color));
 }
@@ -2819,7 +2819,7 @@ QColor &QColor::operator=(Qt::GlobalColor color) Q_DECL_NOTHROW
     Returns \c true if this color has the same RGB and alpha values as \a color;
     otherwise returns \c false.
 */
-bool QColor::operator==(const QColor &color) const Q_DECL_NOTHROW
+bool QColor::operator==(const QColor &color) const noexcept
 {
     if (cspec == Hsl && cspec == color.cspec) {
         return (ct.argb.alpha == color.ct.argb.alpha
@@ -2846,7 +2846,7 @@ bool QColor::operator==(const QColor &color) const Q_DECL_NOTHROW
     Returns \c true if this color has a different RGB and alpha values from
     \a color; otherwise returns \c false.
 */
-bool QColor::operator!=(const QColor &color) const Q_DECL_NOTHROW
+bool QColor::operator!=(const QColor &color) const noexcept
 { return !operator==(color); }
 
 
@@ -2863,7 +2863,7 @@ QColor::operator QVariant() const
     Marks the color as invalid and sets all components to zero (alpha is set
     to fully opaque for compatibility with Qt 3).
 */
-void QColor::invalidate() Q_DECL_NOTHROW
+void QColor::invalidate() noexcept
 {
     cspec = Invalid;
     ct.argb.alpha = USHRT_MAX;
diff --git a/src/gui/painting/qcolor.h b/src/gui/painting/qcolor.h
index 4822612cf8..cbc8b98f9c 100644
--- a/src/gui/painting/qcolor.h
+++ b/src/gui/painting/qcolor.h
@@ -67,32 +67,32 @@ public:
     enum Spec { Invalid, Rgb, Hsv, Cmyk, Hsl };
     enum NameFormat { HexRgb, HexArgb };
 
-    inline QColor() Q_DECL_NOTHROW;
-    QColor(Qt::GlobalColor color) Q_DECL_NOTHROW;
+    inline QColor() noexcept;
+    QColor(Qt::GlobalColor color) noexcept;
     inline QColor(int r, int g, int b, int a = 255);
-    QColor(QRgb rgb) Q_DECL_NOTHROW;
-    QColor(QRgba64 rgba64) Q_DECL_NOTHROW;
+    QColor(QRgb rgb) noexcept;
+    QColor(QRgba64 rgba64) noexcept;
 #if QT_STRINGVIEW_LEVEL < 2
     inline QColor(const QString& name);
 #endif
     explicit inline QColor(QStringView name);
     inline QColor(const char *aname) : QColor(QLatin1String(aname)) {}
     inline QColor(QLatin1String name);
-    QColor(Spec spec) Q_DECL_NOTHROW;
+    QColor(Spec spec) noexcept;
 
 #if QT_VERSION < QT_VERSION_CHECK(6,0,0)
-    inline QColor(const QColor &color) Q_DECL_NOTHROW; // ### Qt 6: remove all of these, the trivial ones are fine.
+    inline QColor(const QColor &color) noexcept; // ### Qt 6: remove all of these, the trivial ones are fine.
 # ifdef Q_COMPILER_RVALUE_REFS
-    QColor(QColor &&other) Q_DECL_NOTHROW : cspec(other.cspec), ct(other.ct) {}
-    QColor &operator=(QColor &&other) Q_DECL_NOTHROW
+    QColor(QColor &&other) noexcept : cspec(other.cspec), ct(other.ct) {}
+    QColor &operator=(QColor &&other) noexcept
     { cspec = other.cspec; ct = other.ct; return *this; }
 # endif
-    QColor &operator=(const QColor &) Q_DECL_NOTHROW;
+    QColor &operator=(const QColor &) noexcept;
 #endif // Qt < 6
 
-    QColor &operator=(Qt::GlobalColor color) Q_DECL_NOTHROW;
+    QColor &operator=(Qt::GlobalColor color) noexcept;
 
-    bool isValid() const Q_DECL_NOTHROW;
+    bool isValid() const noexcept;
 
     // ### Qt 6: merge overloads
     QString name() const;
@@ -106,25 +106,25 @@ public:
 
     static QStringList colorNames();
 
-    inline Spec spec() const Q_DECL_NOTHROW
+    inline Spec spec() const noexcept
     { return cspec; }
 
-    int alpha() const Q_DECL_NOTHROW;
+    int alpha() const noexcept;
     void setAlpha(int alpha);
 
-    qreal alphaF() const Q_DECL_NOTHROW;
+    qreal alphaF() const noexcept;
     void setAlphaF(qreal alpha);
 
-    int red() const Q_DECL_NOTHROW;
-    int green() const Q_DECL_NOTHROW;
-    int blue() const Q_DECL_NOTHROW;
+    int red() const noexcept;
+    int green() const noexcept;
+    int blue() const noexcept;
     void setRed(int red);
     void setGreen(int green);
     void setBlue(int blue);
 
-    qreal redF() const Q_DECL_NOTHROW;
-    qreal greenF() const Q_DECL_NOTHROW;
-    qreal blueF() const Q_DECL_NOTHROW;
+    qreal redF() const noexcept;
+    qreal greenF() const noexcept;
+    qreal blueF() const noexcept;
     void setRedF(qreal red);
     void setGreenF(qreal green);
     void setBlueF(qreal blue);
@@ -135,26 +135,26 @@ public:
     void getRgbF(qreal *r, qreal *g, qreal *b, qreal *a = nullptr) const;
     void setRgbF(qreal r, qreal g, qreal b, qreal a = 1.0);
 
-    QRgba64 rgba64() const Q_DECL_NOTHROW;
-    void setRgba64(QRgba64 rgba) Q_DECL_NOTHROW;
+    QRgba64 rgba64() const noexcept;
+    void setRgba64(QRgba64 rgba) noexcept;
 
-    QRgb rgba() const Q_DECL_NOTHROW;
-    void setRgba(QRgb rgba) Q_DECL_NOTHROW;
+    QRgb rgba() const noexcept;
+    void setRgba(QRgb rgba) noexcept;
 
-    QRgb rgb() const Q_DECL_NOTHROW;
-    void setRgb(QRgb rgb) Q_DECL_NOTHROW;
+    QRgb rgb() const noexcept;
+    void setRgb(QRgb rgb) noexcept;
 
-    int hue() const Q_DECL_NOTHROW; // 0 <= hue < 360
-    int saturation() const Q_DECL_NOTHROW;
-    int hsvHue() const Q_DECL_NOTHROW; // 0 <= hue < 360
-    int hsvSaturation() const Q_DECL_NOTHROW;
-    int value() const Q_DECL_NOTHROW;
+    int hue() const noexcept; // 0 <= hue < 360
+    int saturation() const noexcept;
+    int hsvHue() const noexcept; // 0 <= hue < 360
+    int hsvSaturation() const noexcept;
+    int value() const noexcept;
 
-    qreal hueF() const Q_DECL_NOTHROW; // 0.0 <= hueF < 360.0
-    qreal saturationF() const Q_DECL_NOTHROW;
-    qreal hsvHueF() const Q_DECL_NOTHROW; // 0.0 <= hueF < 360.0
-    qreal hsvSaturationF() const Q_DECL_NOTHROW;
-    qreal valueF() const Q_DECL_NOTHROW;
+    qreal hueF() const noexcept; // 0.0 <= hueF < 360.0
+    qreal saturationF() const noexcept;
+    qreal hsvHueF() const noexcept; // 0.0 <= hueF < 360.0
+    qreal hsvSaturationF() const noexcept;
+    qreal valueF() const noexcept;
 
     void getHsv(int *h, int *s, int *v, int *a = nullptr) const;
     void setHsv(int h, int s, int v, int a = 255);
@@ -162,15 +162,15 @@ public:
     void getHsvF(qreal *h, qreal *s, qreal *v, qreal *a = nullptr) const;
     void setHsvF(qreal h, qreal s, qreal v, qreal a = 1.0);
 
-    int cyan() const Q_DECL_NOTHROW;
-    int magenta() const Q_DECL_NOTHROW;
-    int yellow() const Q_DECL_NOTHROW;
-    int black() const Q_DECL_NOTHROW;
+    int cyan() const noexcept;
+    int magenta() const noexcept;
+    int yellow() const noexcept;
+    int black() const noexcept;
 
-    qreal cyanF() const Q_DECL_NOTHROW;
-    qreal magentaF() const Q_DECL_NOTHROW;
-    qreal yellowF() const Q_DECL_NOTHROW;
-    qreal blackF() const Q_DECL_NOTHROW;
+    qreal cyanF() const noexcept;
+    qreal magentaF() const noexcept;
+    qreal yellowF() const noexcept;
+    qreal blackF() const noexcept;
 
     void getCmyk(int *c, int *m, int *y, int *k, int *a = nullptr); // ### Qt 6: remove
     void getCmyk(int *c, int *m, int *y, int *k, int *a = nullptr) const;
@@ -180,13 +180,13 @@ public:
     void getCmykF(qreal *c, qreal *m, qreal *y, qreal *k, qreal *a = nullptr) const;
     void setCmykF(qreal c, qreal m, qreal y, qreal k, qreal a = 1.0);
 
-    int hslHue() const Q_DECL_NOTHROW; // 0 <= hue < 360
-    int hslSaturation() const Q_DECL_NOTHROW;
-    int lightness() const Q_DECL_NOTHROW;
+    int hslHue() const noexcept; // 0 <= hue < 360
+    int hslSaturation() const noexcept;
+    int lightness() const noexcept;
 
-    qreal hslHueF() const Q_DECL_NOTHROW; // 0.0 <= hueF < 360.0
-    qreal hslSaturationF() const Q_DECL_NOTHROW;
-    qreal lightnessF() const Q_DECL_NOTHROW;
+    qreal hslHueF() const noexcept; // 0.0 <= hueF < 360.0
+    qreal hslSaturationF() const noexcept;
+    qreal lightnessF() const noexcept;
 
     void getHsl(int *h, int *s, int *l, int *a = nullptr) const;
     void setHsl(int h, int s, int l, int a = 255);
@@ -194,21 +194,21 @@ public:
     void getHslF(qreal *h, qreal *s, qreal *l, qreal *a = nullptr) const;
     void setHslF(qreal h, qreal s, qreal l, qreal a = 1.0);
 
-    QColor toRgb() const Q_DECL_NOTHROW;
-    QColor toHsv() const Q_DECL_NOTHROW;
-    QColor toCmyk() const Q_DECL_NOTHROW;
-    QColor toHsl() const Q_DECL_NOTHROW;
+    QColor toRgb() const noexcept;
+    QColor toHsv() const noexcept;
+    QColor toCmyk() const noexcept;
+    QColor toHsl() const noexcept;
 
-    Q_REQUIRED_RESULT QColor convertTo(Spec colorSpec) const Q_DECL_NOTHROW;
+    Q_REQUIRED_RESULT QColor convertTo(Spec colorSpec) const noexcept;
 
-    static QColor fromRgb(QRgb rgb) Q_DECL_NOTHROW;
-    static QColor fromRgba(QRgb rgba) Q_DECL_NOTHROW;
+    static QColor fromRgb(QRgb rgb) noexcept;
+    static QColor fromRgba(QRgb rgba) noexcept;
 
     static QColor fromRgb(int r, int g, int b, int a = 255);
     static QColor fromRgbF(qreal r, qreal g, qreal b, qreal a = 1.0);
 
-    static QColor fromRgba64(ushort r, ushort g, ushort b, ushort a = USHRT_MAX) Q_DECL_NOTHROW;
-    static QColor fromRgba64(QRgba64 rgba) Q_DECL_NOTHROW;
+    static QColor fromRgba64(ushort r, ushort g, ushort b, ushort a = USHRT_MAX) noexcept;
+    static QColor fromRgba64(QRgba64 rgba) noexcept;
 
     static QColor fromHsv(int h, int s, int v, int a = 255);
     static QColor fromHsvF(qreal h, qreal s, qreal v, qreal a = 1.0);
@@ -221,27 +221,27 @@ public:
 
 #if QT_DEPRECATED_SINCE(5, 13)
     QT_DEPRECATED_X("Use QColor::lighter() instead")
-    Q_REQUIRED_RESULT QColor light(int f = 150) const Q_DECL_NOTHROW;
+    Q_REQUIRED_RESULT QColor light(int f = 150) const noexcept;
     QT_DEPRECATED_X("Use QColor::darker() instead")
-    Q_REQUIRED_RESULT QColor dark(int f = 200) const Q_DECL_NOTHROW;
+    Q_REQUIRED_RESULT QColor dark(int f = 200) const noexcept;
 #endif
-    Q_REQUIRED_RESULT QColor lighter(int f = 150) const Q_DECL_NOTHROW;
-    Q_REQUIRED_RESULT QColor darker(int f = 200) const Q_DECL_NOTHROW;
+    Q_REQUIRED_RESULT QColor lighter(int f = 150) const noexcept;
+    Q_REQUIRED_RESULT QColor darker(int f = 200) const noexcept;
 
-    bool operator==(const QColor &c) const Q_DECL_NOTHROW;
-    bool operator!=(const QColor &c) const Q_DECL_NOTHROW;
+    bool operator==(const QColor &c) const noexcept;
+    bool operator!=(const QColor &c) const noexcept;
 
     operator QVariant() const;
 
 #if QT_STRINGVIEW_LEVEL < 2
     static bool isValidColor(const QString &name);
 #endif
-    static bool isValidColor(QStringView) Q_DECL_NOTHROW;
-    static bool isValidColor(QLatin1String) Q_DECL_NOTHROW;
+    static bool isValidColor(QStringView) noexcept;
+    static bool isValidColor(QLatin1String) noexcept;
 
 private:
 
-    void invalidate() Q_DECL_NOTHROW;
+    void invalidate() noexcept;
     template <typename String>
     bool setColorFromString(String name);
 
@@ -286,7 +286,7 @@ private:
 };
 Q_DECLARE_TYPEINFO(QColor, QT_VERSION >= QT_VERSION_CHECK(6,0,0) ? Q_MOVABLE_TYPE : Q_RELOCATABLE_TYPE);
 
-inline QColor::QColor() Q_DECL_NOTHROW
+inline QColor::QColor() noexcept
 { invalidate(); }
 
 inline QColor::QColor(int r, int g, int b, int a)
@@ -304,12 +304,12 @@ inline QColor::QColor(const QString& aname)
 #endif
 
 #if QT_VERSION < QT_VERSION_CHECK(6,0,0)
-inline QColor::QColor(const QColor &acolor) Q_DECL_NOTHROW
+inline QColor::QColor(const QColor &acolor) noexcept
     : cspec(acolor.cspec)
 { ct.argb = acolor.ct.argb; }
 #endif
 
-inline bool QColor::isValid() const Q_DECL_NOTHROW
+inline bool QColor::isValid() const noexcept
 { return cspec != Invalid; }
 
 QT_END_NAMESPACE
diff --git a/src/gui/painting/qmatrix.cpp b/src/gui/painting/qmatrix.cpp
index 24b33243da..b1f01332b6 100644
--- a/src/gui/painting/qmatrix.cpp
+++ b/src/gui/painting/qmatrix.cpp
@@ -248,7 +248,7 @@ QMatrix::QMatrix(qreal m11, qreal m12, qreal m21, qreal m22, qreal dx, qreal dy)
 /*!
      Constructs a matrix that is a copy of the given \a matrix.
  */
-QMatrix::QMatrix(const QMatrix &matrix) Q_DECL_NOTHROW
+QMatrix::QMatrix(const QMatrix &matrix) noexcept
     : _m11(matrix._m11)
     , _m12(matrix._m12)
     , _m21(matrix._m21)
@@ -989,7 +989,7 @@ bool QMatrix::operator==(const QMatrix &m) const
     Returns the hash value for \a key, using
     \a seed to seed the calculation.
 */
-uint qHash(const QMatrix &key, uint seed) Q_DECL_NOTHROW
+uint qHash(const QMatrix &key, uint seed) noexcept
 {
     QtPrivate::QHashCombine hash;
     seed = hash(seed, key.m11());
@@ -1068,7 +1068,7 @@ QMatrix QMatrix::operator *(const QMatrix &m) const
 /*!
     Assigns the given \a matrix's values to this matrix.
 */
-QMatrix &QMatrix::operator=(const QMatrix &matrix) Q_DECL_NOTHROW
+QMatrix &QMatrix::operator=(const QMatrix &matrix) noexcept
 {
     _m11 = matrix._m11;
     _m12 = matrix._m12;
diff --git a/src/gui/painting/qmatrix.h b/src/gui/painting/qmatrix.h
index d8a4fcfb1c..a167260ade 100644
--- a/src/gui/painting/qmatrix.h
+++ b/src/gui/painting/qmatrix.h
@@ -64,12 +64,12 @@ public:
 
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     // ### Qt 6: remove; the compiler-generated ones are fine!
-    QMatrix &operator=(QMatrix &&other) Q_DECL_NOTHROW // = default
+    QMatrix &operator=(QMatrix &&other) noexcept // = default
     { memcpy(static_cast<void *>(this), static_cast<void *>(&other), sizeof(QMatrix)); return *this; }
-    QMatrix &operator=(const QMatrix &) Q_DECL_NOTHROW; // = default
-    QMatrix(QMatrix &&other) Q_DECL_NOTHROW // = default
+    QMatrix &operator=(const QMatrix &) noexcept; // = default
+    QMatrix(QMatrix &&other) noexcept // = default
     { memcpy(static_cast<void *>(this), static_cast<void *>(&other), sizeof(QMatrix)); }
-    QMatrix(const QMatrix &other) Q_DECL_NOTHROW; // = default
+    QMatrix(const QMatrix &other) noexcept; // = default
 #endif
 
     void setMatrix(qreal m11, qreal m12, qreal m21, qreal m22,
@@ -140,7 +140,7 @@ private:
 };
 Q_DECLARE_TYPEINFO(QMatrix, Q_MOVABLE_TYPE);
 
-Q_GUI_EXPORT Q_DECL_CONST_FUNCTION uint qHash(const QMatrix &key, uint seed = 0) Q_DECL_NOTHROW;
+Q_GUI_EXPORT Q_DECL_CONST_FUNCTION uint qHash(const QMatrix &key, uint seed = 0) noexcept;
 
 // mathematical semantics
 inline QPoint operator*(const QPoint &p, const QMatrix &m)
diff --git a/src/gui/painting/qpagelayout.h b/src/gui/painting/qpagelayout.h
index b41689d33b..faf0827c1a 100644
--- a/src/gui/painting/qpagelayout.h
+++ b/src/gui/painting/qpagelayout.h
@@ -83,12 +83,12 @@ public:
                 const QMarginsF &minMargins = QMarginsF(0, 0, 0, 0));
     QPageLayout(const QPageLayout &other);
 #ifdef Q_COMPILER_RVALUE_REFS
-    QPageLayout &operator=(QPageLayout &&other) Q_DECL_NOTHROW { swap(other); return *this; }
+    QPageLayout &operator=(QPageLayout &&other) noexcept { swap(other); return *this; }
 #endif
     QPageLayout &operator=(const QPageLayout &other);
     ~QPageLayout();
 
-    void swap(QPageLayout &other) Q_DECL_NOTHROW { qSwap(d, other.d); }
+    void swap(QPageLayout &other) noexcept { qSwap(d, other.d); }
 
     friend Q_GUI_EXPORT bool operator==(const QPageLayout &lhs, const QPageLayout &rhs);
     bool isEquivalentTo(const QPageLayout &other) const;
diff --git a/src/gui/painting/qpagesize.h b/src/gui/painting/qpagesize.h
index 82054824b4..a2ea691677 100644
--- a/src/gui/painting/qpagesize.h
+++ b/src/gui/painting/qpagesize.h
@@ -237,13 +237,13 @@ public:
                        SizeMatchPolicy matchPolicy = FuzzyMatch);
     QPageSize(const QPageSize &other);
 #ifdef Q_COMPILER_RVALUE_REFS
-    QPageSize &operator=(QPageSize &&other) Q_DECL_NOTHROW { swap(other); return *this; }
+    QPageSize &operator=(QPageSize &&other) noexcept { swap(other); return *this; }
 #endif
     QPageSize &operator=(const QPageSize &other);
     ~QPageSize();
 
 
-    void swap(QPageSize &other) Q_DECL_NOTHROW { qSwap(d, other.d); }
+    void swap(QPageSize &other) noexcept { qSwap(d, other.d); }
 
     friend Q_GUI_EXPORT bool operator==(const QPageSize &lhs, const QPageSize &rhs);
     bool isEquivalentTo(const QPageSize &other) const;
diff --git a/src/gui/painting/qpaintdevice.cpp b/src/gui/painting/qpaintdevice.cpp
index faaa316085..0ddfba6ee9 100644
--- a/src/gui/painting/qpaintdevice.cpp
+++ b/src/gui/painting/qpaintdevice.cpp
@@ -41,7 +41,7 @@
 
 QT_BEGIN_NAMESPACE
 
-QPaintDevice::QPaintDevice() Q_DECL_NOEXCEPT
+QPaintDevice::QPaintDevice() noexcept
 {
     reserved = 0;
     painters = 0;
diff --git a/src/gui/painting/qpaintdevice.h b/src/gui/painting/qpaintdevice.h
index 9458b4ba9a..5f8dad205d 100644
--- a/src/gui/painting/qpaintdevice.h
+++ b/src/gui/painting/qpaintdevice.h
@@ -90,7 +90,7 @@ public:
 
     static inline qreal devicePixelRatioFScale() { return 0x10000; }
 protected:
-    QPaintDevice() Q_DECL_NOEXCEPT;
+    QPaintDevice() noexcept;
     virtual int metric(PaintDeviceMetric metric) const;
     virtual void initPainter(QPainter *painter) const;
     virtual QPaintDevice *redirected(QPoint *offset) const;
diff --git a/src/gui/painting/qpainterpath.cpp b/src/gui/painting/qpainterpath.cpp
index 42f94d038f..649cfd554b 100644
--- a/src/gui/painting/qpainterpath.cpp
+++ b/src/gui/painting/qpainterpath.cpp
@@ -527,7 +527,7 @@ void QPainterPath::setElementPositionAt(int i, qreal x, qreal y)
 /*!
     Constructs an empty QPainterPath object.
 */
-QPainterPath::QPainterPath() Q_DECL_NOEXCEPT
+QPainterPath::QPainterPath() noexcept
     : d_ptr(0)
 {
 }
diff --git a/src/gui/painting/qpainterpath.h b/src/gui/painting/qpainterpath.h
index a69a192767..2785669260 100644
--- a/src/gui/painting/qpainterpath.h
+++ b/src/gui/painting/qpainterpath.h
@@ -88,17 +88,17 @@ public:
         inline bool operator!=(const Element &e) const { return !operator==(e); }
     };
 
-    QPainterPath() Q_DECL_NOEXCEPT;
+    QPainterPath() noexcept;
     explicit QPainterPath(const QPointF &startPoint);
     QPainterPath(const QPainterPath &other);
     QPainterPath &operator=(const QPainterPath &other);
 #ifdef Q_COMPILER_RVALUE_REFS
-    inline QPainterPath &operator=(QPainterPath &&other) Q_DECL_NOEXCEPT
+    inline QPainterPath &operator=(QPainterPath &&other) noexcept
     { qSwap(d_ptr, other.d_ptr); return *this; }
 #endif
     ~QPainterPath();
 
-    inline void swap(QPainterPath &other) Q_DECL_NOEXCEPT { d_ptr.swap(other.d_ptr); }
+    inline void swap(QPainterPath &other) noexcept { d_ptr.swap(other.d_ptr); }
 
     void clear();
     void reserve(int size);
diff --git a/src/gui/painting/qpen.cpp b/src/gui/painting/qpen.cpp
index 778c770b82..58a1716037 100644
--- a/src/gui/painting/qpen.cpp
+++ b/src/gui/painting/qpen.cpp
@@ -322,7 +322,7 @@ QPen::QPen(const QBrush &brush, qreal width, Qt::PenStyle s, Qt::PenCapStyle c,
     Constructs a pen that is a copy of the given \a pen.
 */
 
-QPen::QPen(const QPen &p) Q_DECL_NOTHROW
+QPen::QPen(const QPen &p) noexcept
 {
     d = p.d;
     if (d)
@@ -381,7 +381,7 @@ void QPen::detach()
     this pen.
 */
 
-QPen &QPen::operator=(const QPen &p) Q_DECL_NOTHROW
+QPen &QPen::operator=(const QPen &p) noexcept
 {
     QPen(p).swap(*this);
     return *this;
diff --git a/src/gui/painting/qpen.h b/src/gui/painting/qpen.h
index 03abfb3d7d..884ec8cdfa 100644
--- a/src/gui/painting/qpen.h
+++ b/src/gui/painting/qpen.h
@@ -65,18 +65,18 @@ public:
     QPen(const QColor &color);
     QPen(const QBrush &brush, qreal width, Qt::PenStyle s = Qt::SolidLine,
          Qt::PenCapStyle c = Qt::SquareCap, Qt::PenJoinStyle j = Qt::BevelJoin);
-    QPen(const QPen &pen) Q_DECL_NOTHROW;
+    QPen(const QPen &pen) noexcept;
 
     ~QPen();
 
-    QPen &operator=(const QPen &pen) Q_DECL_NOTHROW;
+    QPen &operator=(const QPen &pen) noexcept;
 #ifdef Q_COMPILER_RVALUE_REFS
-    QPen(QPen &&other) Q_DECL_NOTHROW
+    QPen(QPen &&other) noexcept
         : d(other.d) { other.d = nullptr; }
-    QPen &operator=(QPen &&other) Q_DECL_NOTHROW
+    QPen &operator=(QPen &&other) noexcept
     { qSwap(d, other.d); return *this; }
 #endif
-    void swap(QPen &other) Q_DECL_NOTHROW { qSwap(d, other.d); }
+    void swap(QPen &other) noexcept { qSwap(d, other.d); }
 
     Qt::PenStyle style() const;
     void setStyle(Qt::PenStyle);
diff --git a/src/gui/painting/qpolygon.h b/src/gui/painting/qpolygon.h
index 8e74a499fd..118861c0f2 100644
--- a/src/gui/painting/qpolygon.h
+++ b/src/gui/painting/qpolygon.h
@@ -61,17 +61,17 @@ public:
     inline explicit QPolygon(int size);
     inline /*implicit*/ QPolygon(const QVector<QPoint> &v) : QVector<QPoint>(v) {}
 #ifdef Q_COMPILER_RVALUE_REFS
-    /*implicit*/ QPolygon(QVector<QPoint> &&v) Q_DECL_NOTHROW : QVector<QPoint>(std::move(v)) {}
+    /*implicit*/ QPolygon(QVector<QPoint> &&v) noexcept : QVector<QPoint>(std::move(v)) {}
 #endif
     QPolygon(const QRect &r, bool closed=false);
     QPolygon(int nPoints, const int *points);
     QPolygon(const QPolygon &other) : QVector<QPoint>(other) {}
 #ifdef Q_COMPILER_RVALUE_REFS
-    QPolygon(QPolygon &&other) Q_DECL_NOTHROW : QVector<QPoint>(std::move(other)) {}
-    QPolygon &operator=(QPolygon &&other) Q_DECL_NOTHROW { swap(other); return *this; }
+    QPolygon(QPolygon &&other) noexcept : QVector<QPoint>(std::move(other)) {}
+    QPolygon &operator=(QPolygon &&other) noexcept { swap(other); return *this; }
 #endif
     QPolygon &operator=(const QPolygon &other) { QVector<QPoint>::operator=(other); return *this; }
-    void swap(QPolygon &other) Q_DECL_NOTHROW { QVector<QPoint>::swap(other); } // prevent QVector<QPoint><->QPolygon swaps
+    void swap(QPolygon &other) noexcept { QVector<QPoint>::swap(other); } // prevent QVector<QPoint><->QPolygon swaps
 
     operator QVariant() const;
 
@@ -146,14 +146,14 @@ public:
     inline explicit QPolygonF(int size);
     inline /*implicit*/ QPolygonF(const QVector<QPointF> &v) : QVector<QPointF>(v) {}
 #ifdef Q_COMPILER_RVALUE_REFS
-    /* implicit */ QPolygonF(QVector<QPointF> &&v) Q_DECL_NOTHROW : QVector<QPointF>(std::move(v)) {}
+    /* implicit */ QPolygonF(QVector<QPointF> &&v) noexcept : QVector<QPointF>(std::move(v)) {}
 #endif
     QPolygonF(const QRectF &r);
     /*implicit*/ QPolygonF(const QPolygon &a);
     inline QPolygonF(const QPolygonF &a) : QVector<QPointF>(a) {}
 #ifdef Q_COMPILER_RVALUE_REFS
-    QPolygonF(QPolygonF &&other) Q_DECL_NOTHROW : QVector<QPointF>(std::move(other)) {}
-    QPolygonF &operator=(QPolygonF &&other) Q_DECL_NOTHROW { swap(other); return *this; }
+    QPolygonF(QPolygonF &&other) noexcept : QVector<QPointF>(std::move(other)) {}
+    QPolygonF &operator=(QPolygonF &&other) noexcept { swap(other); return *this; }
 #endif
     QPolygonF &operator=(const QPolygonF &other) { QVector<QPointF>::operator=(other); return *this; }
     inline void swap(QPolygonF &other) { QVector<QPointF>::swap(other); } // prevent QVector<QPointF><->QPolygonF swaps
diff --git a/src/gui/painting/qregion.cpp b/src/gui/painting/qregion.cpp
index 77718ce747..51eed962f0 100644
--- a/src/gui/painting/qregion.cpp
+++ b/src/gui/painting/qregion.cpp
@@ -1287,10 +1287,10 @@ struct QRegionPrivate {
         }
     }
 
-    const QRect *begin() const Q_DECL_NOTHROW
+    const QRect *begin() const noexcept
     { return numRects == 1 ? &extents : rects.data(); } // avoid vectorize()
 
-    const QRect *end() const Q_DECL_NOTHROW
+    const QRect *end() const noexcept
     { return begin() + numRects; }
 
     inline void append(const QRect *r);
@@ -4321,7 +4321,7 @@ QRegion QRegion::xored(const QRegion &r) const
     }
 }
 
-QRect QRegion::boundingRect() const Q_DECL_NOTHROW
+QRect QRegion::boundingRect() const noexcept
 {
     if (isEmpty())
         return QRect();
@@ -4379,12 +4379,12 @@ QVector<QRect> QRegion::rects() const
 }
 #endif
 
-QRegion::const_iterator QRegion::begin() const Q_DECL_NOTHROW
+QRegion::const_iterator QRegion::begin() const noexcept
 {
     return d->qt_rgn ? d->qt_rgn->begin() : nullptr;
 }
 
-QRegion::const_iterator QRegion::end() const Q_DECL_NOTHROW
+QRegion::const_iterator QRegion::end() const noexcept
 {
     return d->qt_rgn ? d->qt_rgn->end() : nullptr;
 }
@@ -4421,7 +4421,7 @@ void QRegion::setRects(const QRect *rects, int num)
     }
 }
 
-int QRegion::rectCount() const Q_DECL_NOTHROW
+int QRegion::rectCount() const noexcept
 {
     return (d->qt_rgn ? d->qt_rgn->numRects : 0);
 }
diff --git a/src/gui/painting/qregion.h b/src/gui/painting/qregion.h
index 9fe6ed5675..9b6b25d743 100644
--- a/src/gui/painting/qregion.h
+++ b/src/gui/painting/qregion.h
@@ -69,30 +69,30 @@ public:
     QRegion(const QRect &r, RegionType t = Rectangle);
     QRegion(const QPolygon &pa, Qt::FillRule fillRule = Qt::OddEvenFill);
     QRegion(const QRegion &region);
-    QRegion(QRegion &&other) Q_DECL_NOTHROW
+    QRegion(QRegion &&other) noexcept
         : d(other.d) { other.d = const_cast<QRegionData*>(&shared_empty); }
     QRegion(const QBitmap &bitmap);
     ~QRegion();
     QRegion &operator=(const QRegion &);
 #ifdef Q_COMPILER_RVALUE_REFS
-    inline QRegion &operator=(QRegion &&other) Q_DECL_NOEXCEPT
+    inline QRegion &operator=(QRegion &&other) noexcept
     { qSwap(d, other.d); return *this; }
 #endif
-    inline void swap(QRegion &other) Q_DECL_NOEXCEPT { qSwap(d, other.d); }
+    inline void swap(QRegion &other) noexcept { qSwap(d, other.d); }
     bool isEmpty() const;
     bool isNull() const;
 
     typedef const QRect *const_iterator;
     typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
 
-    const_iterator begin()  const Q_DECL_NOTHROW;
-    const_iterator cbegin() const Q_DECL_NOTHROW { return begin(); }
-    const_iterator end()    const Q_DECL_NOTHROW;
-    const_iterator cend()   const Q_DECL_NOTHROW { return end(); }
-    const_reverse_iterator rbegin()  const Q_DECL_NOTHROW { return const_reverse_iterator(end()); }
-    const_reverse_iterator crbegin() const Q_DECL_NOTHROW { return rbegin(); }
-    const_reverse_iterator rend()    const Q_DECL_NOTHROW { return const_reverse_iterator(begin()); }
-    const_reverse_iterator crend()   const Q_DECL_NOTHROW { return rend(); }
+    const_iterator begin()  const noexcept;
+    const_iterator cbegin() const noexcept { return begin(); }
+    const_iterator end()    const noexcept;
+    const_iterator cend()   const noexcept { return end(); }
+    const_reverse_iterator rbegin()  const noexcept { return const_reverse_iterator(end()); }
+    const_reverse_iterator crbegin() const noexcept { return rbegin(); }
+    const_reverse_iterator rend()    const noexcept { return const_reverse_iterator(begin()); }
+    const_reverse_iterator crend()   const noexcept { return rend(); }
 
     bool contains(const QPoint &p) const;
     bool contains(const QRect &r) const;
@@ -121,13 +121,13 @@ public:
     bool intersects(const QRegion &r) const;
     bool intersects(const QRect &r) const;
 
-    QRect boundingRect() const Q_DECL_NOTHROW;
+    QRect boundingRect() const noexcept;
 #if QT_DEPRECATED_SINCE(5, 11)
     QT_DEPRECATED_X("Use begin()/end() instead")
     QVector<QRect> rects() const;
 #endif
     void setRects(const QRect *rect, int num);
-    int rectCount() const Q_DECL_NOTHROW;
+    int rectCount() const noexcept;
 #ifdef Q_COMPILER_MANGLES_RETURN_TYPE
     // ### Qt 6: remove these, they're kept for MSVC compat
     const QRegion operator|(const QRegion &r) const;
diff --git a/src/gui/painting/qtransform.cpp b/src/gui/painting/qtransform.cpp
index 816514a695..6110a548fd 100644
--- a/src/gui/painting/qtransform.cpp
+++ b/src/gui/painting/qtransform.cpp
@@ -795,7 +795,7 @@ bool QTransform::operator==(const QTransform &o) const
     Returns the hash value for \a key, using
     \a seed to seed the calculation.
 */
-uint qHash(const QTransform &key, uint seed) Q_DECL_NOTHROW
+uint qHash(const QTransform &key, uint seed) noexcept
 {
     QtPrivate::QHashCombine hash;
     seed = hash(seed, key.m11());
@@ -1021,7 +1021,7 @@ QTransform QTransform::operator*(const QTransform &m) const
 /*!
     Assigns the given \a matrix's values to this matrix.
 */
-QTransform & QTransform::operator=(const QTransform &matrix) Q_DECL_NOTHROW
+QTransform & QTransform::operator=(const QTransform &matrix) noexcept
 {
     affine._m11 = matrix.affine._m11;
     affine._m12 = matrix.affine._m12;
diff --git a/src/gui/painting/qtransform.h b/src/gui/painting/qtransform.h
index 1e322d435a..18c53f4a6f 100644
--- a/src/gui/painting/qtransform.h
+++ b/src/gui/painting/qtransform.h
@@ -77,13 +77,13 @@ public:
 
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     // ### Qt 6: remove; the compiler-generated ones are fine!
-    QTransform &operator=(QTransform &&other) Q_DECL_NOTHROW // = default
+    QTransform &operator=(QTransform &&other) noexcept // = default
     { memcpy(static_cast<void *>(this), static_cast<void *>(&other), sizeof(QTransform)); return *this; }
-    QTransform &operator=(const QTransform &) Q_DECL_NOTHROW; // = default
-    QTransform(QTransform &&other) Q_DECL_NOTHROW // = default
+    QTransform &operator=(const QTransform &) noexcept; // = default
+    QTransform(QTransform &&other) noexcept // = default
         : affine(Qt::Uninitialized)
     { memcpy(static_cast<void *>(this), static_cast<void *>(&other), sizeof(QTransform)); }
-    QTransform(const QTransform &other) Q_DECL_NOTHROW // = default
+    QTransform(const QTransform &other) noexcept // = default
         : affine(Qt::Uninitialized)
     { memcpy(static_cast<void *>(this), static_cast<const void *>(&other), sizeof(QTransform)); }
 #endif
@@ -202,7 +202,7 @@ private:
 };
 Q_DECLARE_TYPEINFO(QTransform, Q_MOVABLE_TYPE);
 
-Q_GUI_EXPORT Q_DECL_CONST_FUNCTION uint qHash(const QTransform &key, uint seed = 0) Q_DECL_NOTHROW;
+Q_GUI_EXPORT Q_DECL_CONST_FUNCTION uint qHash(const QTransform &key, uint seed = 0) noexcept;
 
 /******* inlines *****/
 inline QTransform::TransformationType QTransform::inline_type() const