Missing features from Ninja

Windows support, including MVSC-related features.
RSP files.
Dynamic dependencies.
console pool. n2 currently just treats console as an ordinary pool of depth 1, and only shows console output after the task completes.
subninja is only partially implemented.

Missing flags

-f, specify build file
-k, keep going until N jobs fail
-l, load average throttling
-n, dry run

Missing subcommands

Most of -d (debugging), -t (tools).

No -w (warnings).

Missing rule variables

$in_newline, $out_newline