Consider moving FreeBSD tests to Cirrus-CI

[asomers]

libc's FreeBSD tests are currently using QEMU on Travis-CI. This is bad for three reasons:

1. It's slow
2. It's complicated
3. Somebody (@wezm I believe) has to build a new image for every release.

Cirrus-ci.com just launched their new FreeBSD service. It works much like Travis, but it has the option of using full VMs instead of just containers. They currently provide images for four different versions of FreeBSD, and building new images is probably easier than with QEMU. https://cirrus-ci.org/guide/FreeBSD/ . Here's an example of a Rust project using Cirrus: asomers/tokio-file#6 .

[wezm]

Somebody (@wezm I believe) has to build a new image for every release.

I updated them last time out of need (to get the build to pass with a change I had made) and documented the process. Having Cirrus manage this sounds like it's worth trying.

[gnzlbg]

@alexcrichton thoughts ? This requires enabling Cirrus-CI for rust-lang/libc, I don't know exactly which permissions Cirrus-CI would like to have, but as long as they are reasonable it might be worth it to enable it and let those interested send PRs to support it.

The same applies to https://builds.sr.ht/ which offers native FreeBSD and OpenBSD VMs. It's in beta, but they said that if we are interested, we should drop them an email: sir@cmpwn.com . Their "pricing" is extremely reasonable ("as much as we want to pay" with a minimum of 2$ / month...) and they are nice (this is how wlroots is tested on those platforms). I'm sure they would help us set things up.

[gnzlbg]

@alexcrichton it seems that Cirrus-CI requires:

• Read access to code
• Read access to members, metadata, pull requests, and single file
• Read and write access to checks and commit statuses

[alexcrichton]

Seems plausible to me to set up!

[asomers]

@alexcrichton if you're willing, please follow the instructions at https://cirrus-ci.org/guide/quick-start/ to configure the Cirrus CI application on libc's github repo. Stop when you get to the "Post Installation" step. I can submit a PR to do the rest.

[alexcrichton]

Ok that's been done! Or at least I'm pretty sure it's done

[asomers]

Cool. Thanks @alexcrichton . BTW, Cirrus also does Linux, Windows, and OSX builds. I don't know if they're faster or slower than Travis, though.