File reproducibletime2.patch of Package libqt5-qtbase

commit ef1fe1e52245c660f930a14d4fe7f915ae085a69
Author: Bernhard M. Wiedemann <bwiedemann@suse.de>
Date:   Thu Aug 3 08:56:09 2023 +0200

    Allow to override build date with SOURCE_DATE_EPOCH
    
    [ChangeLog][qmake] Allows to override _DATE_ with SOURCE_DATE_EPOCH
    to make builds reproducible.
    
    See https://reproducible-builds.org/ for why this is good
    and https://reproducible-builds.org/specs/source-date-epoch/
    for the definition of this variable.
    
    Fixes: QTBUG-115737
    Change-Id: I1964aa0a3d849628440618aa6f0a51af2017d824
    Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
    Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
    Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

diff --git a/qmake/library/qmakeevaluator.cpp b/qmake/library/qmakeevaluator.cpp
index e350923e83..75f4578c08 100644
--- a/qmake/library/qmakeevaluator.cpp
+++ b/qmake/library/qmakeevaluator.cpp
@@ -1037,10 +1037,13 @@ static ProString msvcArchitecture(const QString &vcInstallDir, const QString &pa
 void QMakeEvaluator::loadDefaults()
 {
     ProValueMap &vars = m_valuemapStack.top();
+    qlonglong sde = qgetenv("SOURCE_DATE_EPOCH").toLongLong();
+    QDateTime builddate = sde ? QDateTime::fromSecsSinceEpoch(sde)
+                              : QDateTime::currentDateTime();
 
     vars[ProKey("DIR_SEPARATOR")] << ProString(m_option->dir_sep);
     vars[ProKey("DIRLIST_SEPARATOR")] << ProString(m_option->dirlist_sep);
-    vars[ProKey("_DATE_")] << ProString(QDateTime::currentDateTime().toString());
+    vars[ProKey("_DATE_")] << ProString(builddate.toString());
     if (!m_option->qmake_abslocation.isEmpty())
         vars[ProKey("QMAKE_QMAKE")] << ProString(m_option->qmake_abslocation);
     if (!m_option->qmake_args.isEmpty())