https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61388
--- Comment #3 from Michael Eager <eager at eagercon dot com> --- What sources are you building? When I build --target=microblaze-xilinx-elf from the current sources, I see the same warning message for microblaze.md that you list. I do not see the other errors. Constraint "Q" is defined in constraints.md.
