The support for the 32-bit float GPRs was removed in GCC 8.
gcc/
* config/rs6000/t-rtems: Delete mcpu=8540 multilib.
+2020-04-07 Sebastian Huber <sebastian.huber@embedded-brains.de>
+
+ * config/rs6000/t-rtems: Delete mcpu=8540 multilib.
+
2020-04-07 Jakub Jelinek <jakub@redhat.com>
PR target/94500
MULTILIB_REQUIRED += mcpu=604/msoft-float
MULTILIB_REQUIRED += mcpu=7400
MULTILIB_REQUIRED += mcpu=7400/msoft-float
-MULTILIB_REQUIRED += mcpu=8540
MULTILIB_REQUIRED += mcpu=8540/msoft-float
MULTILIB_REQUIRED += mcpu=860
MULTILIB_REQUIRED += mcpu=e6500/m32