Merge pull request #3477 from 10xcryptodev/pr_remove_qt_todo

Backport qt support minimum to 5.5.1 and associated backports

build-aux/m4/bitcoin_qt.m4

@@ -53,8 +53,8 @@ dnl CAUTION: Do not use this inside of a conditional.
 AC_DEFUN([BITCOIN_QT_INIT],[
   dnl enable qt support
   AC_ARG_WITH([gui],
-    [AS_HELP_STRING([--with-gui@<:@=no|qt4|qt5|auto@:>@],
+    [AS_HELP_STRING([--with-gui@<:@=no|qt5|auto@:>@],
-    [build dash-qt GUI (default=auto, qt5 tried first)])],
+    [build dash-qt GUI (default=auto)])],
     [
      bitcoin_qt_want_version=$withval
      if test "x$bitcoin_qt_want_version" = xyes; then
@@ -94,18 +94,17 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
   fi
 
   if test "x$use_pkgconfig" = xyes; then
-    BITCOIN_QT_CHECK([_BITCOIN_QT_FIND_LIBS_WITH_PKGCONFIG([$2])])
+    BITCOIN_QT_CHECK([_BITCOIN_QT_FIND_LIBS_WITH_PKGCONFIG])
   else
     BITCOIN_QT_CHECK([_BITCOIN_QT_FIND_LIBS_WITHOUT_PKGCONFIG])
   fi
 
   dnl This is ugly and complicated. Yuck. Works as follows:
-  dnl We can't discern whether Qt4 builds are static or not. For Qt5, we can
+  dnl For Qt5, we can check a header to find out whether Qt is build
-  dnl check a header to find out. When Qt is built statically, some plugins must
+  dnl statically. When Qt is built statically, some plugins must be linked into
-  dnl be linked into the final binary as well. These plugins have changed between
+  dnl the final binary as well.
-  dnl Qt4 and Qt5. With Qt5, languages moved into core and the WindowsIntegration
+  dnl With Qt5, languages moved into core and the WindowsIntegration plugin was
-  dnl plugin was added. Since we can't tell if Qt4 is static or not, it is
+  dnl added.
-  dnl assumed for windows builds.
   dnl _BITCOIN_QT_CHECK_STATIC_PLUGINS does a quick link-check and appends the
   dnl results to QT_LIBS.
   BITCOIN_QT_CHECK([
@@ -113,53 +112,22 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
   TEMP_CXXFLAGS=$CXXFLAGS
   CPPFLAGS="$QT_INCLUDES $CPPFLAGS"
   CXXFLAGS="$PIC_FLAGS $CXXFLAGS"
-  if test "x$bitcoin_qt_got_major_vers" = x5; then
+  _BITCOIN_QT_IS_STATIC
-    _BITCOIN_QT_IS_STATIC
+  if test "x$bitcoin_cv_static_qt" = xyes; then
-    if test "x$bitcoin_cv_static_qt" = xyes; then
+    _BITCOIN_QT_FIND_STATIC_PLUGINS
-      _BITCOIN_QT_FIND_STATIC_PLUGINS
+    AC_DEFINE(QT_STATICPLUGIN, 1, [Define this symbol if qt plugins are static])
-      AC_DEFINE(QT_STATICPLUGIN, 1, [Define this symbol if qt plugins are static])
+    _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QMinimalIntegrationPlugin)],[-lqminimal])
-      AC_CACHE_CHECK(for Qt < 5.4, bitcoin_cv_need_acc_widget,[
+    AC_DEFINE(QT_QPA_PLATFORM_MINIMAL, 1, [Define this symbol if the minimal qt platform exists])
-        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-            #include <QtCore/qconfig.h>
-            #ifndef QT_VERSION
-            #  include <QtCore/qglobal.h>
-            #endif
-          ]],
-          [[
-            #if QT_VERSION >= 0x050400
-            choke
-            #endif
-          ]])],
-        [bitcoin_cv_need_acc_widget=yes],
-        [bitcoin_cv_need_acc_widget=no])
-      ])
-      if test "x$bitcoin_cv_need_acc_widget" = xyes; then
-        _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(AccessibleFactory)], [-lqtaccessiblewidgets])
-      fi
-      _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QMinimalIntegrationPlugin)],[-lqminimal])
-      AC_DEFINE(QT_QPA_PLATFORM_MINIMAL, 1, [Define this symbol if the minimal qt platform exists])
-      if test "x$TARGET_OS" = xwindows; then
-        _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin)],[-lqwindows])
-        AC_DEFINE(QT_QPA_PLATFORM_WINDOWS, 1, [Define this symbol if the qt platform is windows])
-      elif test "x$TARGET_OS" = xlinux; then
-        _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QXcbIntegrationPlugin)],[-lqxcb -lxcb-static])
-        AC_DEFINE(QT_QPA_PLATFORM_XCB, 1, [Define this symbol if the qt platform is xcb])
-      elif test "x$TARGET_OS" = xdarwin; then
-        AX_CHECK_LINK_FLAG([[-framework IOKit]],[QT_LIBS="$QT_LIBS -framework IOKit"],[AC_MSG_ERROR(could not iokit framework)])
-        _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin)],[-lqcocoa])
-        AC_DEFINE(QT_QPA_PLATFORM_COCOA, 1, [Define this symbol if the qt platform is cocoa])
-      fi
-    fi
-  else
     if test "x$TARGET_OS" = xwindows; then
-      AC_DEFINE(QT_STATICPLUGIN, 1, [Define this symbol if qt plugins are static])
+      _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin)],[-lqwindows])
-      _BITCOIN_QT_CHECK_STATIC_PLUGINS([
+      AC_DEFINE(QT_QPA_PLATFORM_WINDOWS, 1, [Define this symbol if the qt platform is windows])
-         Q_IMPORT_PLUGIN(qcncodecs)
+    elif test "x$TARGET_OS" = xlinux; then
-         Q_IMPORT_PLUGIN(qjpcodecs)
+      _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QXcbIntegrationPlugin)],[-lqxcb -lxcb-static])
-         Q_IMPORT_PLUGIN(qtwcodecs)
+      AC_DEFINE(QT_QPA_PLATFORM_XCB, 1, [Define this symbol if the qt platform is xcb])
-         Q_IMPORT_PLUGIN(qkrcodecs)
+    elif test "x$TARGET_OS" = xdarwin; then
-         Q_IMPORT_PLUGIN(AccessibleFactory)],
+      AX_CHECK_LINK_FLAG([[-framework IOKit]],[QT_LIBS="$QT_LIBS -framework IOKit"],[AC_MSG_ERROR(could not iokit framework)])
-         [-lqcncodecs -lqjpcodecs -lqtwcodecs -lqkrcodecs -lqtaccessiblewidgets])
+      _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin)],[-lqcocoa])
+      AC_DEFINE(QT_QPA_PLATFORM_COCOA, 1, [Define this symbol if the qt platform is cocoa])
     fi
   fi
   CPPFLAGS=$TEMP_CPPFLAGS
@@ -167,9 +135,7 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
   ])
 
   if test "x$use_pkgconfig$qt_bin_path" = xyes; then
-    if test "x$bitcoin_qt_got_major_vers" = x5; then
+    qt_bin_path="`$PKG_CONFIG --variable=host_bins Qt5Core 2>/dev/null`"
-      qt_bin_path="`$PKG_CONFIG --variable=host_bins Qt5Core 2>/dev/null`"
-    fi
   fi
 
   if test "x$use_hardening" != xno; then
@@ -219,11 +185,11 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
     ])
   fi
 
-  BITCOIN_QT_PATH_PROGS([MOC], [moc-qt${bitcoin_qt_got_major_vers} moc${bitcoin_qt_got_major_vers} moc], $qt_bin_path)
+  BITCOIN_QT_PATH_PROGS([MOC], [moc-qt5 moc5 moc], $qt_bin_path)
-  BITCOIN_QT_PATH_PROGS([UIC], [uic-qt${bitcoin_qt_got_major_vers} uic${bitcoin_qt_got_major_vers} uic], $qt_bin_path)
+  BITCOIN_QT_PATH_PROGS([UIC], [uic-qt5 uic5 uic], $qt_bin_path)
-  BITCOIN_QT_PATH_PROGS([RCC], [rcc-qt${bitcoin_qt_got_major_vers} rcc${bitcoin_qt_got_major_vers} rcc], $qt_bin_path)
+  BITCOIN_QT_PATH_PROGS([RCC], [rcc-qt5 rcc5 rcc], $qt_bin_path)
-  BITCOIN_QT_PATH_PROGS([LRELEASE], [lrelease-qt${bitcoin_qt_got_major_vers} lrelease${bitcoin_qt_got_major_vers} lrelease], $qt_bin_path)
+  BITCOIN_QT_PATH_PROGS([LRELEASE], [lrelease-qt5 lrelease5 lrelease], $qt_bin_path)
-  BITCOIN_QT_PATH_PROGS([LUPDATE], [lupdate-qt${bitcoin_qt_got_major_vers} lupdate${bitcoin_qt_got_major_vers} lupdate],$qt_bin_path, yes)
+  BITCOIN_QT_PATH_PROGS([LUPDATE], [lupdate-qt5 lupdate5 lupdate],$qt_bin_path, yes)
 
   BITCOIN_QT_CHECK([
     AC_CACHE_CHECK([whether $RCC accepts --format-version option],
@@ -277,7 +243,7 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
   ],[
     bitcoin_enable_qt=no
   ])
-  AC_MSG_RESULT([$bitcoin_enable_qt (Qt${bitcoin_qt_got_major_vers})])
+  AC_MSG_RESULT([$bitcoin_enable_qt (Qt5)])
 
   AC_SUBST(QT_PIE_FLAGS)
   AC_SUBST(QT_INCLUDES)
@@ -287,7 +253,7 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
   AC_SUBST(QT_DBUS_LIBS)
   AC_SUBST(QT_TEST_INCLUDES)
   AC_SUBST(QT_TEST_LIBS)
-  AC_SUBST(QT_SELECT, qt${bitcoin_qt_got_major_vers})
+  AC_SUBST(QT_SELECT, qt5)
   AC_SUBST(MOC_DEFS)
 ])
 
@@ -295,7 +261,7 @@ dnl All macros below are internal and should _not_ be used from the main
 dnl configure.ac.
 dnl ----
 
-dnl Internal. Check if the included version of Qt is Qt5.
+dnl Internal. Check included version of Qt against minimum specified in doc/dependencies.md
 dnl Requires: INCLUDES must be populated as necessary.
 dnl Output: bitcoin_cv_qt5=yes|no
 AC_DEFUN([_BITCOIN_QT_CHECK_QT5],[
@@ -307,7 +273,7 @@ AC_DEFUN([_BITCOIN_QT_CHECK_QT5],[
       #endif
     ]],
     [[
-      #if QT_VERSION < 0x050000
+      #if QT_VERSION < 0x050501
       choke
       #endif
     ]])],
@@ -316,7 +282,7 @@ AC_DEFUN([_BITCOIN_QT_CHECK_QT5],[
 ])])
 
 dnl Internal. Check if the linked version of Qt was built as static libs.
-dnl Requires: Qt5. This check cannot determine if Qt4 is static.
+dnl Requires: Qt5.
 dnl Requires: INCLUDES and LIBS must be populated as necessary.
 dnl Output: bitcoin_cv_static_qt=yes|no
 dnl Output: Defines QT_STATICPLUGIN if plugins are static.
@@ -361,58 +327,48 @@ AC_DEFUN([_BITCOIN_QT_CHECK_STATIC_PLUGINS],[
 ])
 
 dnl Internal. Find paths necessary for linking qt static plugins
-dnl Inputs: bitcoin_qt_got_major_vers. 4 or 5.
 dnl Inputs: qt_plugin_path. optional.
 dnl Outputs: QT_LIBS is appended
 AC_DEFUN([_BITCOIN_QT_FIND_STATIC_PLUGINS],[
-  if test "x$bitcoin_qt_got_major_vers" = x5; then
+    if test "x$qt_plugin_path" != x; then
-      if test "x$qt_plugin_path" != x; then
+      QT_LIBS="$QT_LIBS -L$qt_plugin_path/platforms"
-        QT_LIBS="$QT_LIBS -L$qt_plugin_path/platforms"
+      if test -d "$qt_plugin_path/accessible"; then
-        if test -d "$qt_plugin_path/accessible"; then
+        QT_LIBS="$QT_LIBS -L$qt_plugin_path/accessible"
-          QT_LIBS="$QT_LIBS -L$qt_plugin_path/accessible"
-        fi
       fi
-     if test "x$use_pkgconfig" = xyes; then
+    fi
-     : dnl
+   if test "x$use_pkgconfig" = xyes; then
-     m4_ifdef([PKG_CHECK_MODULES],[
+   : dnl
-       PKG_CHECK_MODULES([QTPLATFORM], [Qt5PlatformSupport], [QT_LIBS="$QTPLATFORM_LIBS $QT_LIBS"])
+   m4_ifdef([PKG_CHECK_MODULES],[
-       if test "x$TARGET_OS" = xlinux; then
+     PKG_CHECK_MODULES([QTPLATFORM], [Qt5PlatformSupport], [QT_LIBS="$QTPLATFORM_LIBS $QT_LIBS"])
-         PKG_CHECK_MODULES([X11XCB], [x11-xcb], [QT_LIBS="$X11XCB_LIBS $QT_LIBS"])
+     if test "x$TARGET_OS" = xlinux; then
-         if ${PKG_CONFIG} --exists "Qt5Core >= 5.5" 2>/dev/null; then
+       PKG_CHECK_MODULES([X11XCB], [x11-xcb], [QT_LIBS="$X11XCB_LIBS $QT_LIBS"])
-           PKG_CHECK_MODULES([QTXCBQPA], [Qt5XcbQpa], [QT_LIBS="$QTXCBQPA_LIBS $QT_LIBS"])
+       PKG_CHECK_MODULES([QTXCBQPA], [Qt5XcbQpa], [QT_LIBS="$QTXCBQPA_LIBS $QT_LIBS"])
-         fi
+     elif test "x$TARGET_OS" = xdarwin; then
-       elif test "x$TARGET_OS" = xdarwin; then
+       PKG_CHECK_MODULES([QTPRINT], [Qt5PrintSupport], [QT_LIBS="$QTPRINT_LIBS $QT_LIBS"])
-         PKG_CHECK_MODULES([QTPRINT], [Qt5PrintSupport], [QT_LIBS="$QTPRINT_LIBS $QT_LIBS"])
+     fi
-       fi
+   ])
-     ])
+   else
-     else
+     if test "x$TARGET_OS" = xwindows; then
-       if test "x$TARGET_OS" = xwindows; then
+       AC_CACHE_CHECK(for Qt >= 5.6, bitcoin_cv_need_platformsupport,[
-         AC_CACHE_CHECK(for Qt >= 5.6, bitcoin_cv_need_platformsupport,[
+         AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-           AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+             #include <QtCore/qconfig.h>
-               #include <QtCore/qconfig.h>
+             #ifndef QT_VERSION
-               #ifndef QT_VERSION
+             #  include <QtCore/qglobal.h>
-               #  include <QtCore/qglobal.h>
+             #endif
-               #endif
+           ]],
-             ]],
+           [[
-             [[
+             #if QT_VERSION < 0x050600
-               #if QT_VERSION < 0x050600
+             choke
-               choke
+             #endif
-               #endif
+           ]])],
-             ]])],
+         [bitcoin_cv_need_platformsupport=yes],
-           [bitcoin_cv_need_platformsupport=yes],
+         [bitcoin_cv_need_platformsupport=no])
-           [bitcoin_cv_need_platformsupport=no])
+       ])
-         ])
+       if test "x$bitcoin_cv_need_platformsupport" = xyes; then
-         if test "x$bitcoin_cv_need_platformsupport" = xyes; then
+         BITCOIN_QT_CHECK(AC_CHECK_LIB([${QT_LIB_PREFIX}PlatformSupport],[main],,BITCOIN_QT_FAIL(lib${QT_LIB_PREFIX}PlatformSupport not found)))
-           BITCOIN_QT_CHECK(AC_CHECK_LIB([${QT_LIB_PREFIX}PlatformSupport],[main],,BITCOIN_QT_FAIL(lib${QT_LIB_PREFIX}PlatformSupport not found)))
-         fi
        fi
      fi
-  else
+   fi
-    if test "x$qt_plugin_path" != x; then
-      QT_LIBS="$QT_LIBS -L$qt_plugin_path/accessible"
-      QT_LIBS="$QT_LIBS -L$qt_plugin_path/codecs"
-    fi
-  fi
 ])
 
 dnl Internal. Find Qt libraries using pkg-config.
@@ -421,38 +377,14 @@ dnl         first.
 dnl Inputs: $1: If bitcoin_qt_want_version is "auto", check for this version
 dnl         first.
 dnl Outputs: All necessary QT_* variables are set.
-dnl Outputs: bitcoin_qt_got_major_vers is set to "4" or "5".
 dnl Outputs: have_qt_test and have_qt_dbus are set (if applicable) to yes|no.
 AC_DEFUN([_BITCOIN_QT_FIND_LIBS_WITH_PKGCONFIG],[
   m4_ifdef([PKG_CHECK_MODULES],[
-  auto_priority_version=$1
+    QT_LIB_PREFIX=Qt5
-  if test "x$auto_priority_version" = x; then
-    auto_priority_version=qt5
-  fi
-    if test "x$bitcoin_qt_want_version" = xqt5 ||  ( test "x$bitcoin_qt_want_version" = xauto && test "x$auto_priority_version" = xqt5 ); then
-      QT_LIB_PREFIX=Qt5
-      bitcoin_qt_got_major_vers=5
-    else
-      QT_LIB_PREFIX=Qt
-      bitcoin_qt_got_major_vers=4
-    fi
     qt5_modules="Qt5Core Qt5Gui Qt5Network Qt5Widgets"
-    qt4_modules="QtCore QtGui QtNetwork"
     BITCOIN_QT_CHECK([
-      if test "x$bitcoin_qt_want_version" = xqt5 || ( test "x$bitcoin_qt_want_version" = xauto && test "x$auto_priority_version" = xqt5 ); then
+      PKG_CHECK_MODULES([QT5], [$qt5_modules], [QT_INCLUDES="$QT5_CFLAGS"; QT_LIBS="$QT5_LIBS" have_qt=yes],[have_qt=no])
-        PKG_CHECK_MODULES([QT5], [$qt5_modules], [QT_INCLUDES="$QT5_CFLAGS"; QT_LIBS="$QT5_LIBS" have_qt=yes],[have_qt=no])
-      elif test "x$bitcoin_qt_want_version" = xqt4 || ( test "x$bitcoin_qt_want_version" = xauto && test "x$auto_priority_version" = xqt4 ); then
-        PKG_CHECK_MODULES([QT4], [$qt4_modules], [QT_INCLUDES="$QT4_CFLAGS"; QT_LIBS="$QT4_LIBS" ; have_qt=yes], [have_qt=no])
-      fi
 
-      dnl qt version is set to 'auto' and the preferred version wasn't found. Now try the other.
-      if test "x$have_qt" = xno && test "x$bitcoin_qt_want_version" = xauto; then
-        if test "x$auto_priority_version" = xqt5; then
-          PKG_CHECK_MODULES([QT4], [$qt4_modules], [QT_INCLUDES="$QT4_CFLAGS"; QT_LIBS="$QT4_LIBS" ; have_qt=yes; QT_LIB_PREFIX=Qt; bitcoin_qt_got_major_vers=4], [have_qt=no])
-        else
-          PKG_CHECK_MODULES([QT5], [$qt5_modules], [QT_INCLUDES="$QT5_CFLAGS"; QT_LIBS="$QT5_LIBS" ; have_qt=yes; QT_LIB_PREFIX=Qt5; bitcoin_qt_got_major_vers=5], [have_qt=no])
-        fi
-      fi
       if test "x$have_qt" != xyes; then
         have_qt=no
         BITCOIN_QT_FAIL([Qt dependencies not found])
@@ -473,7 +405,6 @@ dnl from the discovered headers.
 dnl Inputs: bitcoin_qt_want_version (from --with-gui=). The version to use.
 dnl         If "auto", the version will be discovered by _BITCOIN_QT_CHECK_QT5.
 dnl Outputs: All necessary QT_* variables are set.
-dnl Outputs: bitcoin_qt_got_major_vers is set to "4" or "5".
 dnl Outputs: have_qt_test and have_qt_dbus are set (if applicable) to yes|no.
 AC_DEFUN([_BITCOIN_QT_FIND_LIBS_WITHOUT_PKGCONFIG],[
   TEMP_CPPFLAGS="$CPPFLAGS"
@@ -495,13 +426,7 @@ AC_DEFUN([_BITCOIN_QT_FIND_LIBS_WITHOUT_PKGCONFIG],[
     if test "x$bitcoin_qt_want_version" = xauto; then
       _BITCOIN_QT_CHECK_QT5
     fi
-    if test "x$bitcoin_cv_qt5" = xyes || test "x$bitcoin_qt_want_version" = xqt5; then
+    QT_LIB_PREFIX=Qt5
-      QT_LIB_PREFIX=Qt5
-      bitcoin_qt_got_major_vers=5
-    else
-      QT_LIB_PREFIX=Qt
-      bitcoin_qt_got_major_vers=4
-    fi
   ])
 
   BITCOIN_QT_CHECK([
@@ -523,9 +448,7 @@ AC_DEFUN([_BITCOIN_QT_FIND_LIBS_WITHOUT_PKGCONFIG],[
   BITCOIN_QT_CHECK(AC_CHECK_LIB([${QT_LIB_PREFIX}Core]   ,[main],,BITCOIN_QT_FAIL(lib${QT_LIB_PREFIX}Core not found)))
   BITCOIN_QT_CHECK(AC_CHECK_LIB([${QT_LIB_PREFIX}Gui]    ,[main],,BITCOIN_QT_FAIL(lib${QT_LIB_PREFIX}Gui not found)))
   BITCOIN_QT_CHECK(AC_CHECK_LIB([${QT_LIB_PREFIX}Network],[main],,BITCOIN_QT_FAIL(lib${QT_LIB_PREFIX}Network not found)))
-  if test "x$bitcoin_qt_got_major_vers" = x5; then
+  BITCOIN_QT_CHECK(AC_CHECK_LIB([${QT_LIB_PREFIX}Widgets],[main],,BITCOIN_QT_FAIL(lib${QT_LIB_PREFIX}Widgets not found)))
-    BITCOIN_QT_CHECK(AC_CHECK_LIB([${QT_LIB_PREFIX}Widgets],[main],,BITCOIN_QT_FAIL(lib${QT_LIB_PREFIX}Widgets not found)))
-  fi
   QT_LIBS="$LIBS"
   LIBS="$TEMP_LIBS"
 
@@ -551,4 +474,3 @@ AC_DEFUN([_BITCOIN_QT_FIND_LIBS_WITHOUT_PKGCONFIG],[
   CXXFLAGS="$TEMP_CXXFLAGS"
   LIBS="$TEMP_LIBS"
 ])
-

configure.ac

@@ -165,7 +165,7 @@ AC_ARG_ENABLE([lcov],
   [enable lcov testing (default is no)])],
   [use_lcov=$enableval],
   [use_lcov=no])
-  
+
 AC_ARG_ENABLE([lcov-branch-coverage],
   [AS_HELP_STRING([--enable-lcov-branch-coverage],
   [enable lcov testing branch coverage (default is no)])],
@@ -856,7 +856,7 @@ fi
 BITCOIN_QT_INIT
 
 dnl sets $bitcoin_enable_qt, $bitcoin_enable_qt_test, $bitcoin_enable_qt_dbus
-BITCOIN_QT_CONFIGURE([$use_pkgconfig], [qt5])
+BITCOIN_QT_CONFIGURE([$use_pkgconfig])
 
 if test x$build_bitcoin_utils$build_bitcoind$bitcoin_enable_qt$use_tests$use_bench = xnonononono; then
     use_boost=no
@@ -1442,12 +1442,11 @@ case ${OS} in
    ;;
 esac
 
-echo 
+echo
 echo "Options used to compile and link:"
 echo "  with wallet         = $enable_wallet"
 echo "  with gui / qt       = $bitcoin_enable_qt"
 if test x$bitcoin_enable_qt != xno; then
-    echo "    qt version        = $bitcoin_qt_got_major_vers"
     echo "    with qr           = $use_qr"
 fi
 echo "  with zmq            = $use_zmq"
@@ -1459,7 +1458,7 @@ echo "  debug enabled       = $enable_debug"
 echo "  crash hooks enabled = $enable_crashhooks"
 echo "  miner enabled       = $enable_miner"
 echo "  werror              = $enable_werror"
-echo 
+echo
 echo "  target os           = $TARGET_OS"
 echo "  build os            = $BUILD_OS"
 echo
@@ -1470,4 +1469,4 @@ echo "  CXX                 = $CXX"
 echo "  CXXFLAGS            = $CXXFLAGS"
 echo "  LDFLAGS             = $LDFLAGS"
 echo "  ARFLAGS             = $ARFLAGS"
-echo 
+echo

src/qt/addressbookpage.cpp

@@ -141,13 +141,8 @@ void AddressBookPage::setModel(AddressTableModel *_model)
     ui->tableView->sortByColumn(0, Qt::AscendingOrder);
 
     // Set column widths
-#if QT_VERSION < 0x050000
-    ui->tableView->horizontalHeader()->setResizeMode(AddressTableModel::Label, QHeaderView::Stretch);
-    ui->tableView->horizontalHeader()->setResizeMode(AddressTableModel::Address, QHeaderView::ResizeToContents);
-#else
     ui->tableView->horizontalHeader()->setSectionResizeMode(AddressTableModel::Label, QHeaderView::Stretch);
     ui->tableView->horizontalHeader()->setSectionResizeMode(AddressTableModel::Address, QHeaderView::ResizeToContents);
-#endif
 
     connect(ui->tableView->selectionModel(), SIGNAL(selectionChanged(QItemSelection,QItemSelection)),
         this, SLOT(selectionChanged()));

src/qt/bantablemodel.cpp

@@ -52,9 +52,7 @@ public:
             g_connman->GetBanned(banMap);
 
         cachedBanlist.clear();
-#if QT_VERSION >= 0x040700
         cachedBanlist.reserve(banMap.size());
-#endif
         for (const auto& entry : banMap)
         {
             CCombinedBan banEntry;

src/qt/bitcoingui.cpp

@@ -55,14 +55,8 @@
 #include <QStyle>
 #include <QTimer>
 #include <QToolBar>
-#include <QVBoxLayout>
-
-#if QT_VERSION < 0x050000
-#include <QTextDocument>
-#include <QUrl>
-#else
 #include <QUrlQuery>
-#endif
+#include <QVBoxLayout>
 
 const std::string BitcoinGUI::DEFAULT_UIPLATFORM =
 #if defined(Q_OS_MAC)
@@ -154,12 +148,6 @@ BitcoinGUI::BitcoinGUI(const PlatformStyle *_platformStyle, const NetworkStyle *
     setWindowIcon(networkStyle->getTrayAndWindowIcon());
     setWindowTitle(windowTitle);
 
-#if defined(Q_OS_MAC) && QT_VERSION < 0x050000
-    // This property is not implemented in Qt 5. Setting it has no effect.
-    // A replacement API (QtMacUnifiedToolBar) is available in QtMacExtras.
-    setUnifiedTitleAndToolBarOnMac(true);
-#endif
-
     rpcConsole = new RPCConsole(_platformStyle, 0);
     helpMessageDialog = new HelpMessageDialog(this, HelpMessageDialog::cmdline);
 #ifdef ENABLE_WALLET
@@ -234,7 +222,7 @@ BitcoinGUI::BitcoinGUI(const PlatformStyle *_platformStyle, const NetworkStyle *
 
     // Override style sheet for progress bar for styles that have a segmented progress bar,
     // as they make the text unreadable (workaround for issue #1071)
-    // See https://qt-project.org/doc/qt-4.8/gallery.html
+    // See https://doc.qt.io/qt-5/gallery.html
     QString curStyle = QApplication::style()->metaObject()->className();
     if(curStyle == "QWindowsStyle" || curStyle == "QWindowsXPStyle")
     {

src/qt/coincontroldialog.cpp

@@ -114,11 +114,7 @@ CoinControlDialog::CoinControlDialog(const PlatformStyle *_platformStyle, QWidge
     connect(ui->treeWidget, SIGNAL(itemChanged(QTreeWidgetItem*, int)), this, SLOT(viewItemChanged(QTreeWidgetItem*, int)));
 
     // click on header
-#if QT_VERSION < 0x050000
-    ui->treeWidget->header()->setClickable(true);
-#else
     ui->treeWidget->header()->setSectionsClickable(true);
-#endif
     connect(ui->treeWidget->header(), SIGNAL(sectionClicked(int)), this, SLOT(headerSectionClicked(int)));
 
     // ok button
@@ -130,10 +126,6 @@ CoinControlDialog::CoinControlDialog(const PlatformStyle *_platformStyle, QWidge
     // Toggle lock state
     connect(ui->pushButtonToggleLock, SIGNAL(clicked()), this, SLOT(buttonToggleLockClicked()));
 
-    // change coin control first column label due Qt4 bug.
-    // see https://github.com/bitcoin/bitcoin/issues/5716
-    ui->treeWidget->headerItem()->setText(COLUMN_CHECKBOX, QString());
-
     ui->treeWidget->setColumnWidth(COLUMN_CHECKBOX, 84);
     ui->treeWidget->setColumnWidth(COLUMN_AMOUNT, 100);
     ui->treeWidget->setColumnWidth(COLUMN_LABEL, 170);
@@ -433,16 +425,6 @@ void CoinControlDialog::viewItemChanged(QTreeWidgetItem* item, int column)
         if (ui->treeWidget->isEnabled()) // do not update on every click for (un)select all
             CoinControlDialog::updateLabels(model, this);
     }
-
-    // TODO: Remove this temporary qt5 fix after Qt5.3 and Qt5.4 are no longer used.
-    //       Fixed in Qt5.5 and above: https://bugreports.qt.io/browse/QTBUG-43473
-#if QT_VERSION >= 0x050000
-    else if (column == COLUMN_CHECKBOX && item->childCount() > 0)
-    {
-        if (item->checkState(COLUMN_CHECKBOX) == Qt::PartiallyChecked && item->child(0)->checkState(COLUMN_CHECKBOX) == Qt::PartiallyChecked)
-            item->setCheckState(COLUMN_CHECKBOX, Qt::Checked);
-    }
-#endif
 }
 
 // shows count of locked unspent outputs

src/qt/dash.cpp

@@ -58,16 +58,6 @@
 
 #if defined(QT_STATICPLUGIN)
 #include <QtPlugin>
-#if QT_VERSION < 0x050000
-Q_IMPORT_PLUGIN(qcncodecs)
-Q_IMPORT_PLUGIN(qjpcodecs)
-Q_IMPORT_PLUGIN(qtwcodecs)
-Q_IMPORT_PLUGIN(qkrcodecs)
-Q_IMPORT_PLUGIN(qtaccessiblewidgets)
-#else
-#if QT_VERSION < 0x050400
-Q_IMPORT_PLUGIN(AccessibleFactory)
-#endif
 #if defined(QT_QPA_PLATFORM_XCB)
 Q_IMPORT_PLUGIN(QXcbIntegrationPlugin);
 #elif defined(QT_QPA_PLATFORM_WINDOWS)
@@ -76,11 +66,6 @@ Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin);
 Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin);
 #endif
 #endif
-#endif
-
-#if QT_VERSION < 0x050000
-#include <QTextCodec>
-#endif
 
 // Declare meta types used for QMetaObject::invokeMethod
 Q_DECLARE_METATYPE(bool*)
@@ -153,16 +138,6 @@ static void initTranslations(QTranslator &qtTranslatorBase, QTranslator &qtTrans
 }
 
 /* qDebug() message handler --> debug.log */
-#if QT_VERSION < 0x050000
-void DebugMessageHandler(QtMsgType type, const char *msg)
-{
-    if (type == QtDebugMsg) {
-        LogPrint(BCLog::QT, "GUI: %s\n", msg);
-    } else {
-        LogPrintf("GUI: %s\n", msg);
-    }
-}
-#else
 void DebugMessageHandler(QtMsgType type, const QMessageLogContext& context, const QString &msg)
 {
     Q_UNUSED(context);
@@ -172,7 +147,6 @@ void DebugMessageHandler(QtMsgType type, const QMessageLogContext& context, cons
         LogPrintf("GUI: %s\n", msg.toStdString());
     }
 }
-#endif
 
 /** Class encapsulating Dash Core startup and shutdown.
  * Allows running startup and shutdown in a different thread from the UI thread.
@@ -589,19 +563,11 @@ int main(int argc, char *argv[])
     // Do not refer to data directory yet, this can be overridden by Intro::pickDataDirectory
 
     /// 2. Basic Qt initialization (not dependent on parameters or configuration)
-#if QT_VERSION < 0x050000
-    // Internal string conversion is all UTF-8
-    QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));
-    QTextCodec::setCodecForCStrings(QTextCodec::codecForTr());
-#endif
-
     Q_INIT_RESOURCE(dash);
     Q_INIT_RESOURCE(dash_locale);
 
-#if QT_VERSION > 0x050100
     // Generate high-dpi pixmaps
     QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
-#endif
 #if QT_VERSION >= 0x050600
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 #endif
@@ -712,17 +678,12 @@ int main(int argc, char *argv[])
     /// 9. Main GUI initialization
     // Install global event filter that makes sure that long tooltips can be word-wrapped
     app.installEventFilter(new GUIUtil::ToolTipToRichTextFilter(TOOLTIP_WRAP_THRESHOLD, &app));
-#if QT_VERSION < 0x050000
-    // Install qDebug() message handler to route to debug.log
-    qInstallMsgHandler(DebugMessageHandler);
-#else
 #if defined(Q_OS_WIN)
     // Install global event filter for processing Windows session related Windows messages (WM_QUERYENDSESSION and WM_ENDSESSION)
     qApp->installNativeEventFilter(new WinShutdownMonitor());
 #endif
     // Install qDebug() message handler to route to debug.log
     qInstallMessageHandler(DebugMessageHandler);
-#endif
     // Allow parameter interaction before we create the options model
     app.parameterSetup();
     // Load GUI settings from QSettings
@@ -743,7 +704,7 @@ int main(int argc, char *argv[])
         // so the GUI thread won't be held up.
         if (BitcoinCore::baseInitialize()) {
             app.requestInitialize();
-#if defined(Q_OS_WIN) && QT_VERSION >= 0x050000
+#if defined(Q_OS_WIN)
             WinShutdownMonitor::registerShutdownBlockReason(QObject::tr("%1 didn't yet exit safely...").arg(QObject::tr(PACKAGE_NAME)), (HWND)app.getMainWinId());
 #endif
             app.exec();

src/qt/guiutil.cpp

@@ -47,21 +47,14 @@
 #include <QDoubleValidator>
 #include <QFileDialog>
 #include <QFont>
+#include <QFontDatabase>
+#include <QKeyEvent>
 #include <QLineEdit>
 #include <QSettings>
 #include <QTextDocument> // for Qt::mightBeRichText
 #include <QThread>
-#include <QMouseEvent>
-
-#if QT_VERSION < 0x050000
-#include <QUrl>
-#else
 #include <QUrlQuery>
-#endif
+#include <QMouseEvent>
-
-#if QT_VERSION >= 0x50200
-#include <QFontDatabase>
-#endif
 
 static fs::detail::utf8_codecvt_facet utf8;
 
@@ -156,17 +149,7 @@ QString dateTimeStr(qint64 nTime)
 
 QFont fixedPitchFont()
 {
-#if QT_VERSION >= 0x50200
     return QFontDatabase::systemFont(QFontDatabase::FixedFont);
-#else
-    QFont font("Monospace");
-#if QT_VERSION >= 0x040800
-    font.setStyleHint(QFont::Monospace);
-#else
-    font.setStyleHint(QFont::TypeWriter);
-#endif
-    return font;
-#endif
 }
 
 // Just some dummy data to generate an convincing random-looking (but consistent) address
@@ -192,12 +175,10 @@ void setupAddressWidget(QValidatedLineEdit *widget, QWidget *parent, bool fAllow
     parent->setFocusProxy(widget);
 
     widget->setFont(fixedPitchFont());
-#if QT_VERSION >= 0x040700
     // We don't want translators to use own addresses in translations
     // and this is the only place, where this address is supplied.
     widget->setPlaceholderText(QObject::tr("Enter a Dash address (e.g. %1)").arg(
         QString::fromStdString(DummyAddress(Params()))));
-#endif
     widget->setValidator(new BitcoinAddressEntryValidator(parent, fAllowURI));
     widget->setCheckValidator(new BitcoinAddressCheckValidator(parent));
 }
@@ -225,12 +206,8 @@ bool parseBitcoinURI(const QUrl &uri, SendCoinsRecipient *out)
     }
     rv.amount = 0;
 
-#if QT_VERSION < 0x050000
-    QList<QPair<QString, QString> > items = uri.queryItems();
-#else
     QUrlQuery uriQuery(uri);
     QList<QPair<QString, QString> > items = uriQuery.queryItems();
-#endif
 
     for (QList<QPair<QString, QString> >::iterator i = items.begin(); i != items.end(); i++)
     {
@@ -336,11 +313,7 @@ bool isDust(const QString& address, const CAmount& amount)
 
 QString HtmlEscape(const QString& str, bool fMultiLine)
 {
-#if QT_VERSION < 0x050000
-    QString escaped = Qt::escape(str);
-#else
     QString escaped = str.toHtmlEscaped();
-#endif
     escaped = escaped.replace(" ", "&nbsp;");
     if(fMultiLine)
     {
@@ -382,11 +355,7 @@ QString getSaveFileName(QWidget *parent, const QString &caption, const QString &
     QString myDir;
     if(dir.isEmpty()) // Default to user documents location
     {
-#if QT_VERSION < 0x050000
-        myDir = QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation);
-#else
         myDir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
-#endif
     }
     else
     {
@@ -432,11 +401,7 @@ QString getOpenFileName(QWidget *parent, const QString &caption, const QString &
     QString myDir;
     if(dir.isEmpty()) // Default to user documents location
     {
-#if QT_VERSION < 0x050000
-        myDir = QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation);
-#else
         myDir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
-#endif
     }
     else
     {
@@ -613,11 +578,7 @@ void TableViewLastColumnResizingFixer::disconnectViewHeadersSignals()
 // Refactored here for readability.
 void TableViewLastColumnResizingFixer::setViewHeaderResizeMode(int logicalIndex, QHeaderView::ResizeMode resizeMode)
 {
-#if QT_VERSION < 0x050000
-    tableView->horizontalHeader()->setResizeMode(logicalIndex, resizeMode);
-#else
     tableView->horizontalHeader()->setSectionResizeMode(logicalIndex, resizeMode);
-#endif
 }
 
 void TableViewLastColumnResizingFixer::resizeColumn(int nColumnIndex, int width)

src/qt/guiutil.h

@@ -286,7 +286,7 @@ namespace GUIUtil
         void mouseReleaseEvent(QMouseEvent *event);
     };
 
-#if defined(Q_OS_MAC) && QT_VERSION >= 0x050000
+#if defined(Q_OS_MAC)
     // workaround for Qt OSX Bug:
     // https://bugreports.qt-project.org/browse/QTBUG-15631
     // QProgressBar uses around 10% CPU even when app is in background

src/qt/macdockiconhandler.mm

@@ -7,10 +7,6 @@
 #include <AppKit/AppKit.h>
 #include <objc/runtime.h>
 
-#if QT_VERSION < 0x050000
-extern void qt_mac_set_dock_menu(QMenu *);
-#endif
-
 static MacDockIconHandler *s_instance = nullptr;
 
 bool dockClickHandler(id self, SEL _cmd, ...) {

src/qt/networkstyle.cpp

@@ -85,13 +85,8 @@ NetworkStyle::NetworkStyle(const QString &_appName, const int iconColorHueShift,
         rotateColors(splashImageImg, iconColorHueShift, iconColorSaturationReduction);
 
         //convert back to QPixmap
-#if QT_VERSION >= 0x040700
         appIconPixmap.convertFromImage(appIconImg);
         splashImagePixmap.convertFromImage(splashImageImg);
-#else
-        appIconPixmap = QPixmap::fromImage(appIconImg);
-        splashImagePixmap = QPixmap::fromImage(splashImageImg);
-#endif
     }
 
     appIcon             = QIcon(appIconPixmap);

src/qt/openuridialog.cpp

@@ -16,9 +16,7 @@ OpenURIDialog::OpenURIDialog(QWidget *parent) :
     ui(new Ui::OpenURIDialog)
 {
     ui->setupUi(this);
-#if QT_VERSION >= 0x040700
     ui->uriEdit->setPlaceholderText("dash:");
-#endif
 }
 
 OpenURIDialog::~OpenURIDialog()

src/qt/optionsdialog.cpp

@@ -104,28 +104,16 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
         /** check if the locale name consists of 2 parts (language_country) */
         if(langStr.contains("_"))
         {
-#if QT_VERSION >= 0x040800
             /** display language strings as "native language - native country (locale name)", e.g. "Deutsch - Deutschland (de)" */
             ui->lang->addItem(locale.nativeLanguageName() + QString(" - ") + locale.nativeCountryName() + QString(" (") + langStr + QString(")"), QVariant(langStr));
-#else
-            /** display language strings as "language - country (locale name)", e.g. "German - Germany (de)" */
-            ui->lang->addItem(QLocale::languageToString(locale.language()) + QString(" - ") + QLocale::countryToString(locale.country()) + QString(" (") + langStr + QString(")"), QVariant(langStr));
-#endif
         }
         else
         {
-#if QT_VERSION >= 0x040800
             /** display language strings as "native language (locale name)", e.g. "Deutsch (de)" */
             ui->lang->addItem(locale.nativeLanguageName() + QString(" (") + langStr + QString(")"), QVariant(langStr));
-#else
-            /** display language strings as "language (locale name)", e.g. "German (de)" */
-            ui->lang->addItem(QLocale::languageToString(locale.language()) + QString(" (") + langStr + QString(")"), QVariant(langStr));
-#endif
         }
     }
-#if QT_VERSION >= 0x040700
     ui->thirdPartyTxUrls->setPlaceholderText("https://example.com/tx/%s");
-#endif
 
     ui->unit->setModel(new BitcoinUnits(this));
 

src/qt/paymentrequestplus.cpp

@@ -97,12 +97,10 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
             qWarning() << "PaymentRequestPlus::getMerchant: Payment request: certificate expired or not yet active: " << qCert;
             return false;
         }
-#if QT_VERSION >= 0x050000
         if (qCert.isBlacklisted()) {
             qWarning() << "PaymentRequestPlus::getMerchant: Payment request: certificate blacklisted: " << qCert;
             return false;
         }
-#endif
         const unsigned char *data = (const unsigned char *)certChain.certificate(i).data();
         X509 *cert = d2i_X509(nullptr, &data, certChain.certificate(i).size());
         if (cert)

src/qt/paymentserver.cpp

@@ -41,12 +41,7 @@
 #include <QSslSocket>
 #include <QStringList>
 #include <QTextDocument>
-
-#if QT_VERSION < 0x050000
-#include <QUrl>
-#else
 #include <QUrlQuery>
-#endif
 
 const int BITCOIN_IPC_CONNECT_TIMEOUT = 1000; // milliseconds
 const QString BITCOIN_IPC_PREFIX("dash:");
@@ -100,11 +95,7 @@ static QList<QString> savedPaymentRequests;
 
 static void ReportInvalidCertificate(const QSslCertificate& cert)
 {
-#if QT_VERSION < 0x050000
-    qDebug() << QString("%1: Payment server found an invalid certificate: ").arg(__func__) << cert.serialNumber() << cert.subjectInfo(QSslCertificate::CommonName) << cert.subjectInfo(QSslCertificate::OrganizationalUnitName);
-#else
     qDebug() << QString("%1: Payment server found an invalid certificate: ").arg(__func__) << cert.serialNumber() << cert.subjectInfo(QSslCertificate::CommonName) << cert.subjectInfo(QSslCertificate::DistinguishedNameQualifier) << cert.subjectInfo(QSslCertificate::OrganizationalUnitName);
-#endif
 }
 
 //
@@ -157,13 +148,11 @@ void PaymentServer::LoadRootCAs(X509_STORE* _store)
             continue;
         }
 
-#if QT_VERSION >= 0x050000
         // Blacklisted certificate
         if (cert.isBlacklisted()) {
             ReportInvalidCertificate(cert);
             continue;
         }
-#endif
         QByteArray certData = cert.toDer();
         const unsigned char *data = (const unsigned char *)certData.data();
 
@@ -408,11 +397,7 @@ void PaymentServer::handleURIOrFile(const QString& s)
 
     if (s.startsWith(BITCOIN_IPC_PREFIX, Qt::CaseInsensitive)) // dash: URI
     {
-#if QT_VERSION < 0x050000
-        QUrl uri(s);
-#else
         QUrlQuery uri((QUrl(s)));
-#endif
         if (uri.hasQueryItem("r")) // payment request URI
         {
             QByteArray temp;

src/qt/peertablemodel.cpp

@@ -63,9 +63,7 @@ public:
             std::vector<CNodeStats> vstats;
             if(g_connman)
                 g_connman->GetNodeStats(vstats);
-#if QT_VERSION >= 0x040700
             cachedNodeStats.reserve(vstats.size());
-#endif
             for (const CNodeStats& nodestats : vstats)
             {
                 CNodeCombinedStats stats;

src/qt/receiverequestdialog.cpp

@@ -16,9 +16,6 @@
 #include <QMimeData>
 #include <QMouseEvent>
 #include <QPixmap>
-#if QT_VERSION < 0x050000
-#include <QUrl>
-#endif
 
 #if defined(HAVE_CONFIG_H)
 #include <config/dash-config.h> /* for USE_QRCODE */

src/qt/rpcconsole.cpp

@@ -40,10 +40,6 @@
 #include <QTimer>
 #include <QStringList>
 
-#if QT_VERSION < 0x050000
-#include <QUrl>
-#endif
-
 // TODO: add a scrollback limit, as there is currently none
 // TODO: make it possible to filter out categories (esp debug messages when implemented)
 // TODO: receive errors and debug messages through ClientModel

src/qt/sendcoinsentry.cpp

@@ -27,9 +27,7 @@ SendCoinsEntry::SendCoinsEntry(const PlatformStyle *_platformStyle, QWidget *par
 
     if (platformStyle->getUseExtraSpacing())
         ui->payToLayout->setSpacing(4);
-#if QT_VERSION >= 0x040700
     ui->addAsLabel->setPlaceholderText(tr("Enter a label for this address to add it to your address book"));
-#endif
 
     // These icons are needed on Mac also!
     ui->addressBookButton->setIcon(QIcon(":/icons/address-book"));

src/qt/signverifymessagedialog.cpp

@@ -29,9 +29,7 @@ SignVerifyMessageDialog::SignVerifyMessageDialog(const PlatformStyle *_platformS
 {
     ui->setupUi(this);
 
-#if QT_VERSION >= 0x040700
     ui->signatureOut_SM->setPlaceholderText(tr("Click \"Sign Message\" to generate signature"));
-#endif
 
 #ifdef Q_OS_MAC // Icons on push buttons are very uncommon on Mac
     ui->signMessageButton_SM->setIcon(QIcon());

src/qt/test/rpcnestedtests.cpp

@@ -121,7 +121,6 @@ void RPCNestedTests::rpcNestedTests()
     RPCConsole::RPCExecuteCommandLine(result, "rpcNestedTest(   abc   ,   cba )");
     QVERIFY(result == "[\"abc\",\"cba\"]");
 
-#if QT_VERSION >= 0x050300
     // do the QVERIFY_EXCEPTION_THROWN checks only with Qt5.3 and higher (QVERIFY_EXCEPTION_THROWN was introduced in Qt5.3)
     QVERIFY_EXCEPTION_THROWN(RPCConsole::RPCExecuteCommandLine(result, "getblockchaininfo() .\n"), std::runtime_error); //invalid syntax
     QVERIFY_EXCEPTION_THROWN(RPCConsole::RPCExecuteCommandLine(result, "getblockchaininfo() getblockchaininfo()"), std::runtime_error); //invalid syntax
@@ -132,5 +131,4 @@ void RPCNestedTests::rpcNestedTests()
     QVERIFY_EXCEPTION_THROWN(RPCConsole::RPCExecuteCommandLine(result, "rpcNestedTest abc,,abc"), std::runtime_error); //don't tollerate empty arguments when using ,
     QVERIFY_EXCEPTION_THROWN(RPCConsole::RPCExecuteCommandLine(result, "rpcNestedTest(abc,,abc)"), std::runtime_error); //don't tollerate empty arguments when using ,
     QVERIFY_EXCEPTION_THROWN(RPCConsole::RPCExecuteCommandLine(result, "rpcNestedTest(abc,,)"), std::runtime_error); //don't tollerate empty arguments when using ,
-#endif
 }

src/qt/test/test_main.cpp

@@ -27,12 +27,6 @@
 
 #if defined(QT_STATICPLUGIN)
 #include <QtPlugin>
-#if QT_VERSION < 0x050000
-Q_IMPORT_PLUGIN(qcncodecs)
-Q_IMPORT_PLUGIN(qjpcodecs)
-Q_IMPORT_PLUGIN(qtwcodecs)
-Q_IMPORT_PLUGIN(qkrcodecs)
-#else
 #if defined(QT_QPA_PLATFORM_MINIMAL)
 Q_IMPORT_PLUGIN(QMinimalIntegrationPlugin);
 #endif
@@ -44,7 +38,6 @@ Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin);
 Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin);
 #endif
 #endif
-#endif
 
 extern void noui_connect();
 

src/qt/transactionview.cpp

@@ -113,16 +113,12 @@ TransactionView::TransactionView(const PlatformStyle *platformStyle, QWidget *pa
     hlayout->addWidget(typeWidget);
 
     search_widget = new QLineEdit(this);
-#if QT_VERSION >= 0x040700
     search_widget->setPlaceholderText(tr("Enter address, transaction id, or label to search"));
-#endif
     search_widget->setObjectName("search_widget");
     hlayout->addWidget(search_widget);
 
     amountWidget = new QLineEdit(this);
-#if QT_VERSION >= 0x040700
     amountWidget->setPlaceholderText(tr("Min amount"));
-#endif
     if (platformStyle->getUseExtraSpacing()) {
         amountWidget->setFixedWidth(118);
     } else {

src/qt/winshutdownmonitor.cpp

@@ -4,7 +4,7 @@
 
 #include <qt/winshutdownmonitor.h>
 
-#if defined(Q_OS_WIN) && QT_VERSION >= 0x050000
+#if defined(Q_OS_WIN)
 #include <init.h>
 #include <util.h>
 

src/qt/winshutdownmonitor.h

@@ -9,7 +9,6 @@
 #include <QByteArray>
 #include <QString>
 
-#if QT_VERSION >= 0x050000
 #include <windef.h> // for HWND
 
 #include <QAbstractNativeEventFilter>
@@ -24,6 +23,5 @@ public:
     static void registerShutdownBlockReason(const QString& strReason, const HWND& mainWinId);
 };
 #endif
-#endif
 
 #endif // BITCOIN_QT_WINSHUTDOWNMONITOR_H