LLVM supports (to various degrees) a number of experimental extensions.
All experimental extensions have experimental- as a prefix. There is
explicitly no compatibility promised between versions of the toolchain,
and regular users are strongly advised not to make use of experimental
extensions before they reach ratification.
Fix compile error:
riscv64-unknown-elf-clang: error: invalid arch name 'rv64gcv_zfh_zvfh', requires '-menable-experimental-extensions' for experimental extension 'zvfh'
Signed-off-by: chao an <anchao@lixiang.com>
d59f9186ca