Fix compatibility with Qt 6.8 (#3121)

Signed-off-by: Jared Van Bortel <jared@nomic.ai>

gpt4all-chat/CHANGELOG.md

@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## [Unreleased]
+
+### Changed
+- Implement Qt 6.8 compatibility ([#3121](https://github.com/nomic-ai/gpt4all/pull/3121))
+
 ## [3.4.2] - 2024-10-16
 
 ### Fixed
@@ -164,6 +169,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - Fix several Vulkan resource management issues ([#2694](https://github.com/nomic-ai/gpt4all/pull/2694))
 - Fix crash/hang when some models stop generating, by showing special tokens ([#2701](https://github.com/nomic-ai/gpt4all/pull/2701))
 
+[Unreleased]: https://github.com/nomic-ai/gpt4all/compare/v3.4.2...HEAD
 [3.4.2]: https://github.com/nomic-ai/gpt4all/compare/v3.4.1...v3.4.2
 [3.4.1]: https://github.com/nomic-ai/gpt4all/compare/v3.4.0...v3.4.1
 [3.4.0]: https://github.com/nomic-ai/gpt4all/compare/v3.3.0...v3.4.0

gpt4all-chat/CMakeLists.txt

@@ -77,6 +77,10 @@ configure_file(
 
 find_package(Qt6 6.4 COMPONENTS Core HttpServer LinguistTools Pdf Quick QuickDialogs2 Sql Svg REQUIRED)
 
+if (QT_KNOWN_POLICY_QTP0004)
+    qt_policy(SET QTP0004 NEW)  # generate extra qmldir files on Qt 6.8+
+endif()
+
 # Get the Qt6Core target properties
 get_target_property(Qt6Core_INCLUDE_DIRS Qt6::Core INTERFACE_INCLUDE_DIRECTORIES)
 get_target_property(Qt6Core_LIBRARY_RELEASE Qt6::Core LOCATION_RELEASE)

gpt4all-chat/qml/MySettingsStack.qml

@@ -2,6 +2,7 @@ import QtCore
 import QtQuick
 import QtQuick.Controls
 import QtQuick.Controls.Basic
+import QtQuick.Controls.impl
 import QtQuick.Layouts
 import QtQuick.Dialogs
 import Qt.labs.folderlistmodel

gpt4all-chat/src/server.cpp

@@ -37,6 +37,10 @@
 #include <unordered_map>
 #include <utility>
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
+#   include <QTcpServer>
+#endif
+
 using namespace std::string_literals;
 using namespace Qt::Literals::StringLiterals;
 
@@ -435,7 +439,6 @@ T &parseRequest(T &request, QJsonObject &&obj)
 Server::Server(Chat *chat)
     : ChatLLM(chat, true /*isServer*/)
     , m_chat(chat)
-    , m_server(nullptr)
 {
     connect(this, &Server::threadStarted, this, &Server::start);
     connect(this, &Server::databaseResultsChanged, this, &Server::handleDatabaseResultsChanged);
@@ -457,10 +460,23 @@ static QJsonObject requestFromJson(const QByteArray &request)
 void Server::start()
 {
     m_server = std::make_unique<QHttpServer>(this);
-    if (!m_server->listen(QHostAddress::LocalHost, MySettings::globalInstance()->networkPort())) {
+#if QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
-        qWarning() << "ERROR: Unable to start the server";
+    auto *tcpServer = new QTcpServer(m_server.get());
+#else
+    auto *tcpServer = m_server.get();
+#endif
+
+    auto port = MySettings::globalInstance()->networkPort();
+    if (!tcpServer->listen(QHostAddress::LocalHost, port)) {
+        qWarning() << "Server ERROR: Failed to listen on port" << port;
         return;
     }
+#if QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
+    if (!m_server->bind(tcpServer)) {
+        qWarning() << "Server ERROR: Failed to HTTP server to socket" << port;
+        return;
+    }
+#endif
 
     m_server->route("/v1/models", QHttpServerRequest::Method::Get,
         [](const QHttpServerRequest &) {
@@ -600,10 +616,19 @@ void Server::start()
         }
     );
 
-    m_server->afterRequest([] (QHttpServerResponse &&resp) {
+#if QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
+    m_server->addAfterRequestHandler(this, [](const QHttpServerRequest &req, QHttpServerResponse &resp) {
+        Q_UNUSED(req);
+        auto headers = resp.headers();
+        headers.append("Access-Control-Allow-Origin"_L1, "*"_L1);
+        resp.setHeaders(std::move(headers));
+    });
+#else
+    m_server->afterRequest([](QHttpServerResponse &&resp) {
         resp.addHeader("Access-Control-Allow-Origin", "*");
         return std::move(resp);
     });
+#endif
 
     connect(this, &Server::requestServerNewPromptResponsePair, m_chat,
         &Chat::serverNewPromptResponsePair, Qt::BlockingQueuedConnection);