https://bugzilla.redhat.com/show_bug.cgi?id=1663348
--- Comment #2 from Kevin Kofler kevin@tigcc.ticalc.org --- Normally, gcc-c++ is dragged in transitively by the KDE devel stack (the package built fine in Copr: https://copr.fedorainfracloud.org/coprs/kkofler/kannolo/build/841425/ ), but I can add it explicitly.
But the error you are getting is bizarre, because CMake says that both gcc and g++ are found: -- The C compiler identification is GNU 8.2.1 -- The CXX compiler identification is GNU 8.2.1 and that there is a /usr/bin/cc (which is normally provided by gcc), but that /usr/bin/cc is producing output that the assembler does not understand. So this looks like a different and more complex issue than just a missing BR gcc-c++.