Multilib llvm riscv toolchain not work as expected

[fanghuaqi]

Hi there,

I tried to download prebuilt toolchain from https://buildbot.embecosm.com/view/Releases/job/riscv32-clang-ubuntu2004-release/.

compiled a simple helloworld.

$ cat hello.c
#include <stdio.h>

int main(void) {
  printf("Hello World!\n");
  return 0;
}
riscv32-embecosm-clang-centos7-20230115
$ clang --target=riscv64-unknown-elf -march=rv64imafdc -mabi=lp64d -fuse-ld=lld  -o hello.elf hello.c
ld.lld: error: /tmp/hello-1b68d7.o: cannot link object files with different floating-point ABI
clang-16: error: ld command failed with exit code 1 (use -v to see invocation)
riscv32-embecosm-clang-centos7-20230115
$ clang --target=riscv64-unknown-elf -march=rv64imafdc -mabi=lp64d -o hello.elf hello.c
/home/share/devtools/riscv/llvmtoolchain/riscv32-embecosm-clang-centos7-20230115/bin/riscv64-unknown-elf-ld: /tmp/hello-924f32.o: can't link double-float modules with soft-float modules
/home/share/devtools/riscv/llvmtoolchain/riscv32-embecosm-clang-centos7-20230115/bin/riscv64-unknown-elf-ld: failed to merge target specific data of file /tmp/hello-924f32.o
clang-16: error: ld command failed with exit code 1 (use -v to see invocation)

I thought it might be caused by the compiler-rt is not multilib compiled, so link failed. Any suggestion about how to fix it.

Thanks