Il 07/05/2016 20:05, David Faure ha scritto:
We disable seed randomisation and sse4.2 (can't remember why that mattered, that was something Volker found out iirc), and that made it pass until recently, I'm not sure what changed.
Isn't that inherently dangerous though?Even with those disabled, iteration in a hash / set depends on the "history" of that set:
#include <QtCore>
int main()
{
qputenv("QT_HASH_SEED", "0");
qputenv("QT_NO_CPU_FEATURE", "sse4.2");
QSet<QString> set1, set2;
// add 0-999, remove 10-999
for (int i = 0; i < 1000; ++i)
set1.insert(QString::number(i));
for (int i = 10; i < 1000; ++i)
set1.remove(QString::number(i));
// just add 0-9
for (int i = 0; i < 10; ++i)
set2.insert(QString::number(i));
qDebug() << (set1 == set2); // true
qDebug() << (set1.toList() == set2.toList()); // unpredictable, likely false
}
Cheers, -- Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Senior Software Engineer KDAB (UK) Ltd., a KDAB Group company | Tel: UK +44-1625-809908 KDAB - The Qt Experts
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