On Thursday, 16 July 2020 13:16:41 PDT Giuseppe D'Angelo via Development wrote: > Il 16/07/20 12:43, Volker Hilsheimer ha scritto: > > For pre-C++20 (where it’s possible to have zero-size structs), and for > > compilers that don’t respect the [[no_unqiue_address]] attribute, all > > these struct-instances are put into a union. In that case, a class using > > QProperty will be larger (by the same amount no matter the number of > > properties) than the same class in Qt 5. With C+++ 20 and compilers that > > do respect [[no_unique_address]], the size and layout of these classes > > will be the same. > I'm not fully understanding this last part -- does changing compiler > break ABI, because the implementation of properties change (from an > union to [[no_unique_address]] members)?
Yes. Already sent a -2 to the commit that added this support, because it can't work. The commit will need to be reverted. -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel System Software Products _______________________________________________ Development mailing list Development@qt-project.org https://lists.qt-project.org/listinfo/development
