Add i686-unknown-openbsd target.

[semarie]

It is a preliminary work. I still have some tests failing, but I have a working rustc binary which is able to rebuild itself.

an update of libc should be required too, but I dunno how to do it with vendor/ layout.

r? @alexcrichton

[japaric]

LGTM.

an update of libc should be required too, but I dunno how to do it with vendor/ layout.

At the very least, you'll need to update the src/liblibc submodule in this PR. I don't know the specifics about cargo vendoring though.

[alexcrichton]

@bors: r+

[bors]

📌 Commit 40c609c has been approved by alexcrichton

[semarie]

@alexcrichton Could you unapprove this PR for now please ?

I have pending PR in libc (rust-lang/libc#462) that would require a new liblibc for i686-unknown-openbsd correctness.

I will update this PR once libc PR be accepted.

[japaric]

@bors r-

Let's wait for that libc PR

[semarie]

I updated liblibc submodule.
I also added OpenBSD in librustc_trans/cabi_x86.rs as target requiring particular management for returning a struct (small structs are returned as integers).

[alexcrichton]

@bors: r+

[bors]

📌 Commit 6774e7a has been approved by alexcrichton

[bors]

⌛ Testing commit 6774e7a with merge 2190f6c...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-cargotest, auto-linux-64-cross-freebsd, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-rustbuild, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-opt, auto-mac-64-opt-rustbuild, auto-mac-cross-ios-opt, auto-win-gnu-32-opt, auto-win-gnu-32-opt-rustbuild, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-cargotest, auto-win-msvc-64-opt, auto-win-msvc-64-opt-rustbuild
Approved by: alexcrichton
Pushing 2190f6c to master...

[semarie]

this kind of "restructuration" was outside the scope of the PR, but I tend to agree with this approch, and it could be generalized to a list of options registered by target for required behaviour.