Use Linux kernel trick of giving an .lds file a .S extension to get it
[pintos-anon] / src / userprog /
drwxr-xr-x   ..
-rw-r--r-- 29 Makefile
-rw-r--r-- 7436 addrspace.c
-rw-r--r-- 344 addrspace.h
drwxr-xr-x - build