MIPS64: error[E0531]: cannot find unit struct, unit variant or constant `ENOTSUP` in crate `libc`

[Grommish]

Code

error[E0531]: cannot find unit struct, unit variant or constant `ENOTSUP` in crate `libc`
  --> compiler/rustc_data_structures/src/flock.rs:59:57
   |
59 |                 matches!(err.raw_os_error(), Some(libc::ENOTSUP) | Some(libc::ENOSYS))
   |                                                         ^^^^^^^ not found in `libc`

Meta

rustc --version --verbose:

./rustc --version --verbose
rustc 1.56.1-nightly
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-unknown-linux-gnu
release: 1.56.1-nightly
LLVM version: 13.0.0

Error output

<output>

Backtrace

<backtrace>

[bjorn3]

This is when compiling for mips64-openwrt-linux-musl. See https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/Generating.20native.20rustc.2Fcargo.20binaries.3F for more context.

[Grommish]

sigh Sorry @bjorn3

I should also mention that the mips64_openwrt_linux_musl is just a cloned mips64_unknown_linux_muslabi64 define already in rust, renamed and added to mod.rs to create the tuple.

This is how I'm patching in the new tuple:

--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -941,6 +941,8 @@

     ("bpfeb-unknown-none", bpfeb_unknown_none),
     ("bpfel-unknown-none", bpfel_unknown_none),
+
+    ("mips64-openwrt-linux-musl", mips64_openwrt_linux_musl),
 }

 /// Warnings encountered when parsing the target `json`.
--- /dev/null
+++ b/compiler/rustc_target/src/spec/mips64_openwrt_linux_musl.rs
@@ -0,0 +1,22 @@
+use crate::abi::Endian;
+use crate::spec::{Target, TargetOptions};
+
+pub fn target() -> Target {
+    let mut base = super::linux_musl_base::opts();
+    base.cpu = "mips64r2".to_string();
+    base.features = "+mips64r2".to_string();
+    base.max_atomic_width = Some(64);
+    Target {
+        // LLVM doesn't recognize "muslabi64" yet.
+        llvm_target: "mips64-unknown-linux-musl".to_string(),
+        pointer_width: 64,
+        data_layout: "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
+        arch: "mips64".to_string(),
+        options: TargetOptions {
+            abi: "abi64".to_string(),
+            endian: Endian::Big,
+            mcount: "_mcount".to_string(),
+            ..base
+        },
+    }
+}

[hkratz]

It would likely be best if you could just submit a PR against https://github.com/rust-lang/libc adding

pub const ENOTSUP: ::c_int = EOPNOTSUPP;

at https://github.com/rust-lang/libc/blob/master/src/unix/linux_like/linux/musl/b64/mips64.rs#L507
as it is already done for 32-bit here: https://github.com/rust-lang/libc/blob/master/src/unix/linux_like/linux/musl/b32/mips/mod.rs#L323

@rustbot label -I-ICE

[Grommish]

Appreciate it @hkratz ! I'm not a programmers and I don't know rust, so I'm faking my way thru this, but, I can follow directions and can send PRs after I verify it corrects.. I'll report back!

[Grommish]

It would likely be best if you could just submit a PR against https://github.com/rust-lang/libc adding

pub const ENOTSUP: ::c_int = EOPNOTSUPP;

at https://github.com/rust-lang/libc/blob/master/src/unix/linux_like/linux/musl/b64/mips64.rs#L507 as it is already done for 32-bit here: https://github.com/rust-lang/libc/blob/master/src/unix/linux_like/linux/musl/b32/mips/mod.rs#L323

@rustbot label -I-ICE

Submitted PR

[sanxiyn]

libc PR is merged, closing. Thanks!