added support for GNU/Hurd

compiler/rustc_data_structures/src/flock/unix.rs

@@ -21,8 +21,16 @@ impl Lock {
         let lock_type = if exclusive { libc::F_WRLCK } else { libc::F_RDLCK };
 
         let mut flock: libc::flock = unsafe { mem::zeroed() };
-        flock.l_type = lock_type as libc::c_short;
-        flock.l_whence = libc::SEEK_SET as libc::c_short;
+        #[cfg(not(all(target_os = "hurd", target_arch = "x86")))]
+        {
+            flock.l_type = lock_type as libc::c_short;
+            flock.l_whence = libc::SEEK_SET as libc::c_short;
+        }
+        #[cfg(all(target_os = "hurd", target_arch = "x86"))]
+        {
+            flock.l_type = lock_type as libc::c_int;
+            flock.l_whence = libc::SEEK_SET as libc::c_int;
+        }
         flock.l_start = 0;
         flock.l_len = 0;
 
@@ -39,8 +47,16 @@ impl Lock {
 impl Drop for Lock {
     fn drop(&mut self) {
         let mut flock: libc::flock = unsafe { mem::zeroed() };
-        flock.l_type = libc::F_UNLCK as libc::c_short;
-        flock.l_whence = libc::SEEK_SET as libc::c_short;
+        #[cfg(not(all(target_os = "hurd", target_arch = "x86")))]
+        {
+            flock.l_type = libc::F_UNLCK as libc::c_short;
+            flock.l_whence = libc::SEEK_SET as libc::c_short;
+        }
+        #[cfg(all(target_os = "hurd", target_arch = "x86"))]
+        {
+            flock.l_type = libc::F_UNLCK as libc::c_int;
+            flock.l_whence = libc::SEEK_SET as libc::c_int;
+        }
         flock.l_start = 0;
         flock.l_len = 0;
 

compiler/rustc_target/src/spec/hurd_base.rs

@@ -0,0 +1,15 @@
+use crate::spec::{cvs, RelroLevel, TargetOptions};
+
+pub fn opts() -> TargetOptions {
+    TargetOptions {
+        os: "hurd".into(),
+        dynamic_linking: true,
+        families: cvs!["unix"],
+        has_rpath: true,
+        position_independent_executables: true,
+        relro_level: RelroLevel::Full,
+        has_thread_local: true,
+        crt_static_respected: true,
+        ..Default::default()
+    }
+}

compiler/rustc_target/src/spec/hurd_gnu_base.rs

@@ -0,0 +1,5 @@
+use crate::spec::TargetOptions;
+
+pub fn opts() -> TargetOptions {
+    TargetOptions { env: "gnu".into(), ..super::hurd_base::opts() }
+}

compiler/rustc_target/src/spec/i686_unknown_hurd_gnu.rs

@@ -0,0 +1,19 @@
+use crate::spec::{Cc, LinkerFlavor, Lld, StackProbeType, Target};
+
+pub fn target() -> Target {
+    let mut base = super::hurd_gnu_base::opts();
+    base.cpu = "pentiumpro".into();
+    base.max_atomic_width = Some(64);
+    base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m32"]);
+    base.stack_probes = StackProbeType::InlineOrCall { min_llvm_version_for_inline: (11, 0, 1) };
+
+    Target {
+        llvm_target: "i686-unknown-hurd-gnu".into(),
+        pointer_width: 32,
+        data_layout: "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-\
+            f64:32:64-f80:32-n8:16:32-S128"
+            .into(),
+        arch: "x86".into(),
+        options: base,
+    }
+}

compiler/rustc_target/src/spec/mod.rs

@@ -71,6 +71,8 @@ mod freebsd_base;
 mod fuchsia_base;
 mod haiku_base;
 mod hermit_base;
+mod hurd_base;
+mod hurd_gnu_base;
 mod illumos_base;
 mod l4re_base;
 mod linux_base;
@@ -1367,6 +1369,8 @@ supported_targets! {
     ("i686-unknown-haiku", i686_unknown_haiku),
     ("x86_64-unknown-haiku", x86_64_unknown_haiku),
 
+    ("i686-unknown-hurd-gnu", i686_unknown_hurd_gnu),
+
     ("aarch64-apple-darwin", aarch64_apple_darwin),
     ("x86_64-apple-darwin", x86_64_apple_darwin),
     ("x86_64h-apple-darwin", x86_64h_apple_darwin),

library/std/build.rs

@@ -38,6 +38,7 @@ fn main() {
         || target.contains("vita")
         || target.contains("nto")
         || target.contains("xous")
+        || target.contains("hurd")
         // See src/bootstrap/synthetic_targets.rs
         || env::var("RUSTC_BOOTSTRAP_SYNTHETIC_TARGET").is_ok()
     {