Index: head/lib/libcompiler_rt/Makefile.inc
===================================================================
--- head/lib/libcompiler_rt/Makefile.inc
+++ head/lib/libcompiler_rt/Makefile.inc
@@ -241,3 +241,7 @@
 SRCS+=		bswapdi2.c
 SRCS+=		bswapsi2.c
 .endif
+
+.if ${MACHINE_ARCH:Mriscv*sf}
+CFLAGS+=	-D__SOFT_FP__
+.endif