DragonFlyBSD build issue

[levex]

Hi!

Building on DragonflyBSD fails:

lkurusa@ultra ~/d/nix> uname -r
5.3-DEVELOPMENT
lkurusa@ultra ~/d/nix> git show-ref HEAD
3f9548a88833701559f13eeb10df59dd49643ffd refs/remotes/origin/HEAD
lkurusa@ultra ~/d/nix> cargo clean
lkurusa@ultra ~/d/nix> git status
On branch master
Your branch is up to date with 'origin/master'.

nothing to commit, working tree clean
lkurusa@ultra ~/d/nix> cargo build
   Compiling cc v1.0.25
   Compiling libc v0.2.43 (https://github.com/rust-lang/libc#4e5ef222)
   Compiling cfg-if v0.1.6
   Compiling bitflags v1.0.4
   Compiling void v1.0.2
   Compiling nix v0.11.0 (file:///home/lkurusa/dev/nix)
error[E0658]: access to extern crates through prelude is experimental (see issue #44660)
   --> src/errno.rs:106:29
    |
106 | impl ErrnoSentinel for *mut libc::c_void {
    |                             ^^^^

error[E0658]: access to extern crates through prelude is experimental (see issue #44660)
   --> src/errno.rs:107:51
    |
107 |     fn sentinel() -> Self { (-1 as isize) as *mut libc::c_void }
    |                                                   ^^^^

error[E0425]: cannot find value `ENOMEDIUM` in module `libc`
    --> src/errno.rs:1375:33
     |
1375 |         ENOMEDIUM       = libc::ENOMEDIUM,
     |                                 ^^^^^^^^^ did you mean `ENOMEM`?
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::ENOMEDIUM;
     |

error[E0425]: cannot find value `EUNUSED94` in module `libc`
    --> src/errno.rs:1376:33
     |
1376 |         EUNUSED94       = libc::EUNUSED94,
     |                                 ^^^^^^^^^ not found in `libc`
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EUNUSED94;
     |

error[E0425]: cannot find value `EUNUSED95` in module `libc`
    --> src/errno.rs:1377:33
     |
1377 |         EUNUSED95       = libc::EUNUSED95,
     |                                 ^^^^^^^^^ not found in `libc`
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EUNUSED95;
     |

error[E0425]: cannot find value `EUNUSED96` in module `libc`
    --> src/errno.rs:1378:33
     |
1378 |         EUNUSED96       = libc::EUNUSED96,
     |                                 ^^^^^^^^^ not found in `libc`
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EUNUSED96;
     |

error[E0425]: cannot find value `EUNUSED97` in module `libc`
    --> src/errno.rs:1379:33
     |
1379 |         EUNUSED97       = libc::EUNUSED97,
     |                                 ^^^^^^^^^ not found in `libc`
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EUNUSED97;
     |

error[E0425]: cannot find value `EUNUSED98` in module `libc`
    --> src/errno.rs:1380:33
     |
1380 |         EUNUSED98       = libc::EUNUSED98,
     |                                 ^^^^^^^^^ not found in `libc`
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EUNUSED98;
     |

error[E0425]: cannot find value `EASYNC` in module `libc`
    --> src/errno.rs:1381:33
     |
1381 |         EASYNC          = libc::EASYNC,
     |                                 ^^^^^^ did you mean `O_ASYNC`?
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EASYNC;
     |

error[E0531]: cannot find unit struct/variant or constant `ENOMEDIUM` in module `libc`
    --> src/errno.rs:1487:19
     |
1487 |             libc::ENOMEDIUM => ENOMEDIUM,
     |                   ^^^^^^^^^ did you mean `ENOMEM`?
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::ENOMEDIUM;
     |

error[E0531]: cannot find unit struct/variant or constant `EUNUSED94` in module `libc`
    --> src/errno.rs:1488:19
     |
1488 |             libc::EUNUSED94 => EUNUSED94,
     |                   ^^^^^^^^^ not found in `libc`
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EUNUSED94;
     |

error[E0531]: cannot find unit struct/variant or constant `EUNUSED95` in module `libc`
    --> src/errno.rs:1489:19
     |
1489 |             libc::EUNUSED95 => EUNUSED95,
     |                   ^^^^^^^^^ not found in `libc`
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EUNUSED95;
     |

error[E0531]: cannot find unit struct/variant or constant `EUNUSED96` in module `libc`
    --> src/errno.rs:1490:19
     |
1490 |             libc::EUNUSED96 => EUNUSED96,
     |                   ^^^^^^^^^ not found in `libc`
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EUNUSED96;
     |

error[E0531]: cannot find unit struct/variant or constant `EUNUSED97` in module `libc`
    --> src/errno.rs:1491:19
     |
1491 |             libc::EUNUSED97 => EUNUSED97,
     |                   ^^^^^^^^^ not found in `libc`
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EUNUSED97;
     |

error[E0531]: cannot find unit struct/variant or constant `EUNUSED98` in module `libc`
    --> src/errno.rs:1492:19
     |
1492 |             libc::EUNUSED98 => EUNUSED98,
     |                   ^^^^^^^^^ not found in `libc`
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EUNUSED98;
     |

error[E0531]: cannot find unit struct/variant or constant `EASYNC` in module `libc`
    --> src/errno.rs:1493:19
     |
1493 |             libc::EASYNC => EASYNC,
     |                   ^^^^^^ did you mean `O_ASYNC`?
help: possible candidate is found in another module, you can import it into scope
     |
1277 |     use errno::consts::Errno::EASYNC;
     |

error: aborting due to 16 previous errors

Some errors occurred: E0425, E0531, E0658.
For more information about an error, try `rustc --explain E0425`.
error: Could not compile `nix`.

To learn more, run the command again with --verbose.
lkurusa@ultra ~/d/nix> rustc -vV
rustc 1.29.2
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-unknown-dragonfly
release: 1.29.2
LLVM version: 7.0

I'll debug later this weekend, but thought I'd open the issue in case someone has a quick fix.

[asomers]

None of Nix's regular maintainers use Dragonfly, nor do we have CI setup for it. So this kind of breakage is to be expected.

[levex]

I will have a look and fix this - getting nix to work on Dragonfly is a priority for me right now, so maybe later I can step up as an aide for the dfly part of nix.

[levex]

libc PR to add back the missing errnos: rust-lang/libc#1145

[levex]

This has been fixed by #989 !