Small code changes needed to compile Qt 5.6.3 on current-ish Linux and newer GCCs

qt563-linux.diff

diff -pur qt-everywhere-opensource-src-5.6.3/qtbase/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp qt-everywhere-opensource-src-5.6.3_built/qtbase/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
--- qt-everywhere-opensource-src-5.6.3/qtbase/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp	2017-09-06 14:13:54.000000000 +0200
+++ qt-everywhere-opensource-src-5.6.3_built/qtbase/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp	2021-10-31 19:15:07.120340205 +0100
@@ -698,14 +698,6 @@ void QXcbConnection::xi2ProcessTouch(voi
                          " Minimum libXi version required is 1.7.4."
                          " Expect issues with touch behavior.");
             }
-#elif LIBXI_MAJOR == 1 && (LIBXI_MINOR < 7 || (LIBXI_MINOR == 7 && LIBXI_PATCH < 4))
-            static bool allowTouchWarningShown = false;
-            if (!allowTouchWarningShown) {
-                allowTouchWarningShown = true;
-                qWarning("Skipping XIAllowTouchEvents() due to not having libXi >= 1.7.4."
-                         " libXi version at build time was %d.%d.%d."
-                         " Expect issues with touch behavior.", LIBXI_MAJOR, LIBXI_MINOR, LIBXI_PATCH);
-            }
 #else
             XIAllowTouchEvents(static_cast<Display *>(m_xlib_display), xiDeviceEvent->deviceid,
                                xiDeviceEvent->detail, xiDeviceEvent->event, XIAcceptTouch);
diff -pur qt-everywhere-opensource-src-5.6.3/qtimageformats/src/plugins/imageformats/jp2/qjp2handler.cpp qt-everywhere-opensource-src-5.6.3_built/qtimageformats/src/plugins/imageformats/jp2/qjp2handler.cpp
--- qt-everywhere-opensource-src-5.6.3/qtimageformats/src/plugins/imageformats/jp2/qjp2handler.cpp	2017-09-06 14:15:20.000000000 +0200
+++ qt-everywhere-opensource-src-5.6.3_built/qtimageformats/src/plugins/imageformats/jp2/qjp2handler.cpp	2021-10-31 19:26:18.437026289 +0100
@@ -40,6 +40,9 @@
 
 #include <jasper/jasper.h>
 
+#include <cmath>
+using std::pow;
+
 QT_BEGIN_NAMESPACE
 
 class QJp2HandlerPrivate
diff -pur qt-everywhere-opensource-src-5.6.3/qtserialbus/src/plugins/canbus/socketcan/socketcanbackend.cpp qt-everywhere-opensource-src-5.6.3_built/qtserialbus/src/plugins/canbus/socketcan/socketcanbackend.cpp
--- qt-everywhere-opensource-src-5.6.3/qtserialbus/src/plugins/canbus/socketcan/socketcanbackend.cpp	2017-09-06 14:16:43.000000000 +0200
+++ qt-everywhere-opensource-src-5.6.3_built/qtserialbus/src/plugins/canbus/socketcan/socketcanbackend.cpp	2021-10-31 19:29:49.883699073 +0100
@@ -42,6 +42,7 @@
 
 #include <linux/can/error.h>
 #include <linux/can/raw.h>
+#include <linux/sockios.h>
 #include <errno.h>
 #include <unistd.h>
 #include <net/if.h>