${arch:+--arch=$arch} \
${cpu:+--cpu="$cpu"} \
${cross_prefix:+--cross-prefix="$cross_prefix"} \
+ ${as:+--as="$as"} \
${cc:+--cc="$cc"} \
${ld:+--ld="$ld"} \
${target_os:+--target-os="$target_os"} \
${sysroot:+--sysroot="$sysroot"} \
${target_exec:+--target-exec="$target_exec"} \
${target_path:+--target-path="$target_path"} \
+ ${target_samples:+--target-samples="$target_samples"} \
${extra_cflags:+--extra-cflags="$extra_cflags"} \
${extra_ldflags:+--extra-ldflags="$extra_ldflags"} \
${extra_libs:+--extra-libs="$extra_libs"} \