Recently a serious bug in the compiler was discovered whereby we miscompiled several packages. The problem only occurs in C++ programs that contain a class with a trivial move constructor and deleted copy constructor. For such programs, the calling convention changed inappropriately, in the sense that an object was passed via memory rather than via registers. See https://gcc.gnu.org/PR86094.
I did a scratch mass rebuild with a specially-tweaked gcc in order to find out which packages need to be rebuilt. Since the problem occurred in both GCC 8 and GCC 9, we will need to rebuild packages in F28 and F29:
ceph-12.2.4-1.fc29.src.rpm chromium-67.0.3396.79-1.fc29.src.rpm firefox-60.0.1-6.fc29.src.rpm gdb-8.1.50.20180605-18.fc29.src.rpm insight-8.1.50.20180216-2.fc29.src.rpm mame-0.198-1.fc29.src.rpm v8-6.7.17-4.fc29.src.rpm polymake-3.2r3-1.fc29.src.rpm pybind11-2.2.2-3.fc29.src.rpm qt5-qtwebengine-5.10.1-7.fc29.src.rpm cpprest-2.10.2-2.fc28.src.rpm waylandpp-0.2.3-1.fc29.src.rpm webkit2gtk3-2.21.3-1.fc29.src.rpm webrtc-audio-processing-0.3-7.fc29.src.rpm
The problem is fixed in gcc-8.1.1-2.fc28 and gcc-8.1.1-2.fc29. But it seems the F28 buildroots still have the unpatched version:
$ koji latest-pkg f28-build gcc Build Tag Built by ---------------------------------------- -------------------- ---------------- gcc-8.1.1-1.fc28 f28-updates jakub
So perhaps the rebuild in F28 needs to wait a bit.
Marek