https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116883
--- Comment #1 from Huaqi <fanghuaqi at vip dot qq.com> --- but when I compile it by adding _zvl64b using command line riscv64-unknown-elf-gcc -march=rv32imafc_zve32f_zvl64b -mabi=ilp32f -c tmp.cpp it will not report any error