https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113948
--- Comment #2 from Oleg Endo <olegendo at gcc dot gnu.org> --- -mlra option has been around on RX for a while. I've using GCC 8 as production compiler on a larger firmware. Adding -mlra to the build will make the thing get stuck during linking (using LTO) somewhere, looks like it gets stuck in some infinite loop somewhere.