build: Bump minimum Qt version to 5.5.1

build-aux/m4/bitcoin_qt.m4

@@ -116,24 +116,6 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
   if test "x$bitcoin_cv_static_qt" = xyes; then
     _BITCOIN_QT_FIND_STATIC_PLUGINS
     AC_DEFINE(QT_STATICPLUGIN, 1, [Define this symbol if qt plugins are static])
-    AC_CACHE_CHECK(for Qt < 5.4, bitcoin_cv_need_acc_widget,[
-      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-          #include <QtCore/qconfig.h>
-          #ifndef QT_VERSION
-          #  include <QtCore/qglobal.h>
-          #endif
-        ]],
-        [[
-          #if QT_VERSION >= 0x050400
-          choke
-          #endif
-        ]])],
-      [bitcoin_cv_need_acc_widget=yes],
-      [bitcoin_cv_need_acc_widget=no])
-    ])
-    if test "x$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
@@ -264,7 +246,7 @@ 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],[
@@ -276,7 +258,7 @@ AC_DEFUN([_BITCOIN_QT_CHECK_QT5],[
       #endif
     ]],
     [[
-      #if QT_VERSION < 0x050200 || QT_VERSION_MAJOR < 5
+      #if QT_VERSION < 0x050501
       choke
       #endif
     ]])],
@@ -374,9 +356,7 @@ AC_DEFUN([_BITCOIN_QT_FIND_STATIC_PLUGINS],[
                 fi
        if test "x$TARGET_OS" = xlinux; then
          PKG_CHECK_MODULES([X11XCB], [x11-xcb], [QT_LIBS="$X11XCB_LIBS $QT_LIBS"])
-         if ${PKG_CONFIG} --exists "Qt5Core >= 5.5" 2>/dev/null; then
-           PKG_CHECK_MODULES([QTXCBQPA], [Qt5XcbQpa], [QT_LIBS="$QTXCBQPA_LIBS $QT_LIBS"])
-         fi
+         PKG_CHECK_MODULES([QTXCBQPA], [Qt5XcbQpa], [QT_LIBS="$QTXCBQPA_LIBS $QT_LIBS"])
        elif test "x$TARGET_OS" = xdarwin; then
          PKG_CHECK_MODULES([QTCLIPBOARD], [Qt5ClipboardSupport], [QT_LIBS="-lQt5ClipboardSupport $QT_LIBS"])
          PKG_CHECK_MODULES([QTGRAPHICS], [Qt5GraphicsSupport], [QT_LIBS="-lQt5GraphicsSupport $QT_LIBS"])
@@ -527,4 +507,3 @@ AC_DEFUN([_BITCOIN_QT_FIND_LIBS_WITHOUT_PKGCONFIG],[
   CXXFLAGS="$TEMP_CXXFLAGS"
   LIBS="$TEMP_LIBS"
 ])
-

doc/dependencies.md

@@ -23,7 +23,7 @@ These are the dependencies currently used by Bitcoin Core. You can find instruct
 | protobuf | [2.6.1](https://github.com/google/protobuf/releases) |  | No |  |  |
 | Python (tests) |  | [3.4](https://www.python.org/downloads) |  |  |  |
 | qrencode | [3.4.4](https://fukuchi.org/works/qrencode) |  | No |  |  |
-| Qt | [5.9.7](https://download.qt.io/official_releases/qt/) | [5.2](https://github.com/bitcoin/bitcoin/pull/14725) | No |  |  |
+| Qt | [5.9.7](https://download.qt.io/official_releases/qt/) | [5.5.1](https://github.com/bitcoin/bitcoin/issues/13478) | No |  |  |
 | XCB |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L87) (Linux only) |
 | xkbcommon |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L86) (Linux only) |
 | ZeroMQ | [4.3.1](https://github.com/zeromq/libzmq/releases) | 4.0.0 | No |  |  |

doc/release-notes-15393.md

@@ -0,0 +1,4 @@
+Dependencies
+------------
+
+- The minimum required version of QT has been increased from 5.2 to 5.5.1 (the [depends system](https://github.com/bitcoin/bitcoin/blob/master/depends/README.md) provides 5.9.7)

src/qt/bitcoin.cpp

@@ -55,9 +55,6 @@
 
 #if defined(QT_STATICPLUGIN)
 #include <QtPlugin>
-#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)

src/qt/test/apptests.cpp

@@ -27,9 +27,7 @@
 #include <QTest>
 #include <QTextEdit>
 #include <QtGlobal>
-#if QT_VERSION >= 0x050000
 #include <QtTest/QtTestWidgets>
-#endif
 #include <QtTest/QtTestGui>
 #include <new>
 #include <string>

src/qt/test/rpcnestedtests.cpp

@@ -120,7 +120,6 @@ void RPCNestedTests::rpcNestedTests()
     RPCConsole::RPCExecuteCommandLine(*node, 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(*node, result, "getblockchaininfo() .\n"), std::runtime_error); //invalid syntax
     QVERIFY_EXCEPTION_THROWN(RPCConsole::RPCExecuteCommandLine(*node, result, "getblockchaininfo() getblockchaininfo()"), std::runtime_error); //invalid syntax
@@ -131,5 +130,4 @@ void RPCNestedTests::rpcNestedTests()
     QVERIFY_EXCEPTION_THROWN(RPCConsole::RPCExecuteCommandLine(*node, result, "rpcNestedTest abc,,abc"), std::runtime_error); //don't tollerate empty arguments when using ,
     QVERIFY_EXCEPTION_THROWN(RPCConsole::RPCExecuteCommandLine(*node, result, "rpcNestedTest(abc,,abc)"), std::runtime_error); //don't tollerate empty arguments when using ,
     QVERIFY_EXCEPTION_THROWN(RPCConsole::RPCExecuteCommandLine(*node, result, "rpcNestedTest(abc,,)"), std::runtime_error); //don't tollerate empty arguments when using ,
-#endif
 }