Hopefully fix TimeSpec deprecation (#4)

* Update CMake to 3.15 and make libcommuni actually find Qt

* Hopefully fix `warning: ‘QDateTime QDateTime::toTimeSpec(Qt::TimeSpec) const’ is deprecated: Use toTimeZone instead [-Wdeprecated-declarations]`

* Add QT_VERSION_CHECKs (tested by compiling using 6.8.1)

Author: Wissididom

CMakeLists.txt

@@ -1,6 +1,6 @@
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.15)
 
-project(LibCommuni VERSION 3.6.0)
+project(LibCommuni VERSION 3.7.0)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -9,6 +9,14 @@ set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTORCC ON)
 set(CMAKE_AUTOUIC ON)
 
+option(BUILD_WITH_QT6 "Build with Qt6" On)
+
+if (BUILD_WITH_QT6)
+    set(MAJOR_QT_VERSION "6")
+else()
+    set(MAJOR_QT_VERSION "5")
+endif()
+
 find_package(Qt${MAJOR_QT_VERSION} REQUIRED COMPONENTS Core Network)
 
 if (BUILD_WITH_QT6)

src/core/ircmessage.cpp

@@ -38,6 +38,9 @@
 #include <QMetaEnum>
 #include <QVariant>
 #include <QDebug>
+#if QT_VERSION >= QT_VERSION_CHECK(6, 6, 9)
+#include <QTimeZone>
+#endif
 #include <functional>
 
 IRC_BEGIN_NAMESPACE
@@ -701,7 +704,11 @@ IrcMessage* IrcMessage::fromData(const QByteArray& data, IrcConnection* connecti
     if (!tag.isEmpty()) {
         QDateTime ts = QDateTime::fromString(QString::fromUtf8(tag), Qt::ISODate);
         if (ts.isValid())
+#if QT_VERSION >= QT_VERSION_CHECK(6, 6, 9)
+            message->d_ptr->timeStamp = ts.toTimeZone(QTimeZone::LocalTime);
+#else
             message->d_ptr->timeStamp = ts.toTimeSpec(Qt::LocalTime);
+#endif
     }
     return message;
 }