Packages fail to build after a while all the time. The maintainer fixes them (preferably using an upstream patch), and we move on. The issue with this set of c

Packages fail to build after a while all the time. The maintainer fixes them (preferably using an upstream patch), and we move on. The issue with this set of compiler changes was that a lot of software builds successfully, but the new build suddenly has expected features missing. This happened with the previous attempt: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/AL3PXQ3HX26PCF5PYDZ5RU7VJZSBZEPQ/#7I7DBPE6T52TH4XA5SN2DI2HFPAVBYHT https://lists.fedoraproject.org/archives/list/devel@lists.fe... That happened in 2016. In 2019, we undertook another attempt, this time with config.log/config.h diffing, but for various reasons stopped after fixing a few dozen packages, so it never went to the Fedora/upstream proposal stage. After Xcode and Clang the changed the defaults, it was somewhat easier to convince people that we should get Fedora & upstreams ready for a future GCC change. It also helped that Gentoo has been pushing fixes for Clang compatibility upstream for a while (https://bugs.gentoo.org/408963 https://bugs.gentoo.org/408963, with a broader scope in https://bugs.gentoo.org/870412 https://bugs.gentoo.org/870412).