putting the temporary files in object dir works as well: -save-temps=obj
# "-save-temps=obj" from the "cflags" > ./qemu/configure --target-list=riscv64-softmmu --enable-debug --extra-cflags='-O0 -g3 -save-temps=obj' --prefix=/install/riscv-qemu
# build again without any problem > make -j 8
putting the temporary files in object dir works as well: -save-temps=obj
# "-save-temps=obj" from the "cflags" list=riscv64- softmmu --enable-debug --extra-cflags='-O0 -g3 -save-temps=obj' --prefix= /install/ riscv-qemu
> ./qemu/configure --target-
# build again without any problem
> make -j 8