make buildworld broken on RISC-V.

Hello,

I'm using 14-CURRENT oprovided qcow2 image from September 30 in 
qemu-system-risc64. It runs fine so I'm testing it with attempting make 
buildworld. This unfortunately fails with:

===> lib/clang/headers (includes)
[Creating objdir /usr/obj/usr/src/riscv.riscv64/lib/clang/headers...]
clang-tblgen -gen-arm-bf16  -I 
/usr/src/contrib/llvm-project/clang/include/clang/Basic -d arm_bf16.h.d 
-o arm_bf16.h 
/usr/src/contrib/llvm-project/clang/include/clang/Basic/arm_bf16.td
ELF binary type "0" not known.
/usr/obj/usr/src/riscv.riscv64/tmp/legacy/usr/sbin/clang-tblgen: ELF�Т: 
not found
/usr/obj/usr/src/riscv.riscv64/tmp/legacy/usr/sbin/clang-tblgen: @h�a@8: 
not found
/usr/obj/usr/src/riscv.riscv64/tmp/legacy/usr/sbin/clang-tblgen: @@@0�: 
not found
/usr/obj/usr/src/riscv.riscv64/tmp/legacy/usr/sbin/clang-tblgen: �: not 
found
/usr/obj/usr/src/riscv.riscv64/tmp/legacy/usr/sbin/clang-tblgen: 1: 
Syntax error: "(" unexpected
/usr/obj/usr/src/riscv.riscv64/tmp/legacy/usr/sbin/clang-tblgen: 5: 
Syntax error: Error in command substitution
*** Error code 2

Stop.
make[5]: stopped in /usr/src/lib/clang/headers
*** Error code 1

Stop.
make[4]: stopped in /usr/src/lib/clang
*** Error code 1

Stop.
make[3]: stopped in /usr/src/lib
*** Error code 1

Stop.
make[2]: stopped in /usr/src
       370.58 real       114.97 user       258.16 sys
*** Error code 1

Stop.
make[1]: stopped in /usr/src
*** Error code 1

Stop.
make: stopped in /usr/src


I'm not sure which from available clang-tblgen is invoked:

# find / -type f -name 
'clang-tblgen'/usr/obj/usr/src/riscv.riscv64/tmp/legacy/bin/clang-tblgen
/usr/obj/usr/src/riscv.riscv64/tmp/obj-tools/usr.bin/clang/clang-tblgen/clang-tblgen


but both seems to be reasonable file types:

root@freebsd:/usr/src/lib/clang/headers # file 
/usr/obj/usr/src/riscv.riscv64/tmp/legacy/bin/clang-tblgen
/usr/obj/usr/src/riscv.riscv64/tmp/legacy/bin/clang-tblgen: ELF 64-bit 
LSB executable, UCB RISC-V, version 1 (SYSV), statically linked, 
FreeBSD-style, not stripped
root@freebsd:/usr/src/lib/clang/headers # file 
/usr/obj/usr/src/riscv.riscv64/tmp/obj-tools/usr.bin/clang/clang-tblgen/clang-tblgen
/usr/obj/usr/src/riscv.riscv64/tmp/obj-tools/usr.bin/clang/clang-tblgen/clang-tblgen: 
ELF 64-bit LSB executable, UCB RISC-V, version 1 (SYSV), statically 
linked, FreeBSD-style, not stripped


Is there any trick how to solve this issue?

Thanks,
Karel