why the rvv only success in ggml-cpu/arch/riscv/xxx

[cyk2018]

I found in ggml/src/ggml-cpu/CMakeLists.txt, files like ggml-cpu/quants.c and so on are appended into the list and use -march and -mabi for the whole list, however, when i want to include <riscv_vector.h> in ggml-cpu/quants.c, i get error. So my question is how can I use rvv in files like ggml-cpu/quants.c