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# Ludicrous Speed Compilation with Goma
[TOC]
*** note
At the moment, Goma is only available for Googlers.
***
All commands should be performed in the chroot.
## Login to Goma
First, login to Goma:
``` shellsession
$ goma_auth login
```
You'll be prompted to accept an agreement, and copy a URL into your
browser for login. Be sure to use your @google.com account.
The login info should persist across reboots, so you'll only need to
do this step once (or rarely, if you get logged out).
## Start Goma
Start Goma's `compiler_proxy` daemon. It will run in the background.
``` shellsession
$ goma_ctl ensure_start
```
You'll need to do this each time you start your machine.
## Compiling (Zephyr EC)
Run `zmake` as you normally do, and just add the `--goma` flag. For
example:
``` shellsession
$ zmake --goma testall
```
jrosenth@ observed on a ThinkStation P920 that a clean `testall` with
`--goma` takes only 1 minute 55 seconds, versus 8 minutes and 20
seconds without, so it's worth setting up!
## Compiling (Legacy EC)
The `Makefile` doesn't yet support Goma, but this is planned for the
future. [b/214323409](https://issuetracker.google.com/214323409)
tracks the progress.
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