nm_opts='-g'
# machine
-arch=$(uname -m)
+arch_default=$(uname -m)
cpu="generic"
# OS
-target_os=$(tolower $(uname -s))
-host_os=$target_os
+target_os_default=$(tolower $(uname -s))
+host_os=$target_os_default
# configurable options
enable avcodec
test -n "$cross_prefix" && enable cross_compile
+if enabled cross_compile; then
+ test -n "$arch" && test -n "$target_os" ||
+ die "Must specify target arch and OS when cross-compiling"
+fi
+
+set_default arch target_os
+
ar="${cross_prefix}${ar}"
cc_default="${cross_prefix}${cc_default}"
nm_default="${cross_prefix}${nm_default}"