add aarch64-unknown-openbsd support

[semarie]

• make liblibc to point to libc with aarch64-unknown-openbsd
• make c_char (in std::os::raw) to point to right value

r? @alexcrichton

currently, I have only tested in crosscompilation environement (openbsd x64_64 -> openbsd aarch64). it produces valid binaries.

[alexcrichton]

@bors: r+

[bors]

📌 Commit 6b184b0 has been approved by alexcrichton

[bors]

⌛ Testing commit 6b184b09ce1c186e5a2ed610f21d5f44dd5ec43b with merge 3a97ba4b02384b183ab370e50338f943fc7124b0...

[bors]

💔 Test failed - status-travis

[semarie]

errors are due to libc code for freebsd:

[00:34:48] error: `#[deprecated]` cannot be used in staged api, use `#[rustc_deprecated]` instead
[00:34:48]    --> /checkout/src/rustc/libc_shim/../../liblibc/src/unix/bsd/freebsdlike/freebsd/mod.rs:453:1
[00:34:48]     |
[00:34:48] 453 | pub const IFF_DRV_RUNNING: ::c_int = 0x40;
[00:34:48]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[00:34:48]
[00:34:48] error: `#[deprecated]` cannot be used in staged api, use `#[rustc_deprecated]` instead
[00:34:48]    --> /checkout/src/rustc/libc_shim/../../liblibc/src/unix/bsd/freebsdlike/freebsd/mod.rs:460:1
[00:34:48]     |
[00:34:48] 460 | pub const IFF_DRV_OACTIVE: ::c_int = 0x400;
[00:34:48]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[00:34:48]

it contains code that seems to be not usable in staged api:

#[deprecated(since="0.2.34",
             note="please use the portable `IFF_RUNNING` constant instead")]
pub const IFF_DRV_RUNNING: ::c_int = 0x40;

@alexcrichton what should be the correct way to deal with that ? I assume it should be corrected in libc ? but how ?

[asomers]

Is the problem that rust-lang is using those deprecated constants, or reexporting them?

[semarie]

@asomers I found no usage of this constants neither explicit reexport.

[alexcrichton]

@semarie want to send a PR to libc to remove those attributes?

[semarie]

ok, I updated my branch to include the deprecated removing

[alexcrichton]

@bors: r+

[bors]

📌 Commit 8c7b093 has been approved by alexcrichton