Tracking issue for buildbot

[farcaller]

This one tracks an automated build platform to run tests and do merges automatically.

• set up daily rustc container refresh
• set up zinc sources pull on update (also PRs)
• make zinc compilable in "native" mode (the host is armv7l, there's no armv7-m stdlib; should look more into compiler-rt?; also required by Implement unit testing #50)
• submit artifacts on successful build
• merge PR on successful tests run

[farcaller]

Step 3 partially implemented in #59

[farcaller]

Zinc is now buildable using native (non-cross) toolchain:

time rake PLATFORM=lpc17xx TOOLCHAIN='' RUNTIME_LIB=/usr/lib/libgcc-armv7-m.a build_all
...
real    2m16.379s
user    1m45.240s
sys 0m21.680s

[farcaller]

Just noting the build command so that I don't loose it somewhere:

docker run --volumes-from=vol.zinc-build --volumes-from=vol.rustc-build:ro -t -i -u nobody -e LANG=en_US.UTF-8 --rm rust-build /bin/bash -c 'cd /home/zinc/zinc && git fetch && git reset --hard origin/master && rm -rf build && rake PLATFORM=lpc17xx TOOLCHAIN='' RUNTIME_LIB=/usr/lib/libgcc-armv7-m.a build_all'

[farcaller]

Ended up setting bors (same bot as serves mozilla/rust repo), should be working now under @hacknbot name.

[farcaller]

Bors is using travis build confirmation for green tests, not local builder for now.

[bharrisau]

Think that is good enough for now (build bot is a little unnecessary anyway).

[bharrisau]

We should be able to build compiler-rt for the target (it just needs the endianness defines done manually). I think it is a better solution than libgcc (though libgcc supports the spec=nano for the linker - have to check if the size increases),

[farcaller]

My concern for buildbot is to build master with a rolling window of rust releases to verify how it changes with rust versions. But that's not that trivial to set up as I expected. I will do third step in here (native build for tests) and call it a day.

[farcaller]

If you want to try that — open an issue and go try building compiler-rt, I'm all in. So far I didn't manage to build it correctly :-(

[bharrisau]

I'll give it a go. If the Rust freestanding rfc goes through I will just start building a tarball of rustc + thumb platforms.

[farcaller]

So far bors seems to fit in nicely, so closing this.