Make qminimal plugin optional for Qt6

build-aux/m4/bitcoin_qt.m4

@@ -134,8 +134,9 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
     if test "x$bitcoin_cv_need_acc_widget" = xyes; then
       _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(AccessibleFactory)], [-lqtaccessiblewidgets])
     fi
-    _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QMinimalIntegrationPlugin)],[-lqminimal])
+    _BITCOIN_QT_CHECK_STATIC_PLUGINS_OPTIONAL([Q_IMPORT_PLUGIN(QMinimalIntegrationPlugin)],[-lqminimal],[
-    AC_DEFINE(QT_QPA_PLATFORM_MINIMAL, 1, [Define this symbol if the minimal qt platform exists])
+      AC_DEFINE(QT_QPA_PLATFORM_MINIMAL, 1, [Define this symbol if the minimal qt platform exists])
+    ])
     if test "x$QT_LIB_PREFIX" = xQt6; then
       _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QTlsBackendOpenSSL)],[-lqopensslbackend -lssl -lcrypto])
       AC_DEFINE(QT_TLS_OPENSSL, 1, [Define this symbol if the Qt OpenSSL TLS backend exists])
@@ -384,6 +385,24 @@ AC_DEFUN([_BITCOIN_QT_CHECK_STATIC_PLUGINS],[
   LIBS="$CHECK_STATIC_PLUGINS_TEMP_LIBS"
 ])
 
+dnl Internal. Check optional static plugin link requirements.
+dnl Inputs: $1: A series of Q_IMPORT_PLUGIN().
+dnl Inputs: $2: The libraries that resolve $1.
+dnl Inputs: $3: Action if found.
+AC_DEFUN([_BITCOIN_QT_CHECK_STATIC_PLUGINS_OPTIONAL],[
+  AC_MSG_CHECKING(for optional static Qt plugins: $2)
+  CHECK_STATIC_PLUGINS_TEMP_LIBS="$LIBS"
+  LIBS="$2 $QT_LIBS $LIBS"
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+    #define QT_STATICPLUGIN
+    #include <QtPlugin>
+    $1]],
+    [[return 0;]])],
+    [AC_MSG_RESULT(yes); QT_LIBS="$2 $QT_LIBS"; $3],
+    [AC_MSG_RESULT(no)])
+  LIBS="$CHECK_STATIC_PLUGINS_TEMP_LIBS"
+])
+
 dnl Internal. Find paths necessary for linking qt static plugins
 dnl Inputs: qt_plugin_path. optional.
 dnl Outputs: QT_LIBS is appended

contrib/build-linux-wallet.sh

@@ -101,6 +101,10 @@ if [[ ! -f configure ]]; then
   ./autogen.sh
 fi
 
+if [[ build-aux/m4/bitcoin_qt.m4 -nt configure ]]; then
+  ./autogen.sh
+fi
+
 echo "Configuring Ubuntu Qt6 wallet build..."
 CONFIG_SITE="$BASE_CONFIG" ./configure \
   --disable-maintainer-mode \