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Don't enforce all QMetaType::TypeFlag difference across Qt versions

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QMetaType::IsGadget was introduced in Qt 5.5 and set when Q_GADGET is used.
If an existing Qt 5.4 class was converted to a gadget in Qt 5.5+,
the two types would have differing QMetaType::TypeFlags. Such a conversion
happened for QGeoCoordinate, QGeoShape, QGeoRectangle
and QGeoCircle. There might be other classes too.

In principle, the same problem exists for every future addition to
QMetaType::TypeFlag too. This patch ensures that new flags are kept in
the metatype database and the related qFatal call is not triggered for any
flag >= TypeFlag::WasDeclaredAsMetaType.

Change-Id: Ibb15daeb28d9a11b7f31658f4219cbca2499213f
Task-number: QTBUG-46454
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
This commit is contained in:
Alex Blasche 2015-06-03 15:28:01 +02:00 committed by Jani Heikkinen
parent 81054b117b
commit 36640aa0af
1 changed files with 14 additions and 4 deletions
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18
src/corelib/kernel/qmetatype.cpp
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@ -1046,6 +1046,16 @@ int QMetaType::registerNormalizedType(const NS(QByteArray) &normalizedTypeName,
if (idx >= User) {
previousSize = ct->at(idx - User).size;
previousFlags = ct->at(idx - User).flags;
// Set new/additional flags in case of old library/app.
// Ensures that older code works in conjunction with new Qt releases
// requiring the new flags.
if (flags != previousFlags) {
QCustomTypeInfo &inf = ct->data()[idx - User];
inf.flags |= flags;
if (metaObject)
inf.metaObject = metaObject;
}
}
}
@ -1061,11 +1071,11 @@ int QMetaType::registerNormalizedType(const NS(QByteArray) &normalizedTypeName,
normalizedTypeName.constData(), idx, previousSize, size);
}
// Do not compare types higher than 0x100:
// Ignore WasDeclaredAsMetaType inconsitency, to many users were hitting the problem
previousFlags |= WasDeclaredAsMetaType;
flags |= WasDeclaredAsMetaType;
if (previousFlags != flags) {
// Ignore IsGadget as it was added in Qt 5.5
// Ignore all the future flags as well
if ((previousFlags ^ flags) & 0xff) {
const int maskForTypeInfo = NeedsConstruction | NeedsDestruction | MovableType;
const char *msg = "QMetaType::registerType: Binary compatibility break. "
"\nType flags for type '%s' [%i] don't match. Previously "