On 10/25/19 2:54 AM, Marcos Caceres wrote:
Do you know if it's possible to cross compile on one of those for to target
MacOS? I'd like to build on, and for, MacOS.
Our official mac builds are cross-compiled from Linux, IIRC. So yeah, it
should be possible to do that.
Cross-compiling to target MacOS is a bit involved, requiring getting the
relevant SDKs in the Linux box, the relevant mozconfig flags, and what
not. But probably nothing too bad? I've done it in the past, mostly
cargo-culting from the official mozconfigs in the tree. Not sure if
there are official docs somewhere though.
I also know that sccache-dist can be used somewhat painlessly from Mac,
unlike icecc (requires some setup as described here[1], but doesn't seem
too bad).
So you have two options, I think:
* Setup a Linux box as an sccache-dist scheduler and builder. This
should require no SDKs or what not, but requires some setup in your mac
as described here[1]. Then you'd just do regular sccache-enabled ./mach
build from your Mac, which would then distribute work to your Linux box.
* Setup a Linux box with a full cross-compilation setup, build there,
and somehow pull the objdir from there back to your mac (not sure what's
best here for incremental builds, rsync or something?).
If you only have one builder, and your Mac is slow, the second option is
probably a bit faster to get a clobber build than sccache (as you don't
need to do network stuff for every compilation unit and such). But
obviously I haven't measured, so it may be the case that the sccache
overhead is low and the extra cores from your mac add up for it.
Some caveats about the second setup:
* I don't know how to best do the objdir / incremental builds with
such a setup (some people in this list probably know though, and I'd be
interested in knowing too!).
* You need to do your changes over ssh, or have a setup where you also
sync the src directories or something.
The first option should also be relatively straight-forward, hopefully,
looking at the docs here[2], though I haven't set up an sccache
scheduler myself.
Again there's people in this list that know more than me, so probably
they can help more :)
Cheers,
-- Emilio
[1]:
https://firefox-source-docs.mozilla.org/build/buildsystem/sccache-dist.html
[2]:
https://github.com/mozilla/sccache/blob/master/docs/DistributedQuickstart.md#configure-a-scheduler
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