Auto merge of #78439 - lzutao:rm-clouldabi, r=Mark-Simulacrum

Drop support for all cloudabi targets

`cloudabi` is a tier-3 target, and [it is no longer being maintained upstream][no].

This PR drops supports for cloudabi targets. Those targets are:
* aarch64-unknown-cloudabi
* armv7-unknown-cloudabi
* i686-unknown-cloudabi
* x86_64-unknown-cloudabi

Since this drops supports for a target, I'd like somebody to tag `relnotes` label to this PR.

Some other issues:
* The tidy exception for `cloudabi` crate is still remained because
  * `parking_lot v0.9.0` and `parking_lot v0.10.2` depends on `cloudabi v0.0.3`.
  * `parking_lot v0.11.0` depends on `cloudabi v0.1.0`.

[no]: https://github.com/NuxiNL/cloudabi#note-this-project-is-unmaintained

compiler/rustc_codegen_cranelift/build_sysroot/alloc_system/lib.rs

@@ -23,7 +23,7 @@
     all(target_arch = "wasm32", not(target_os = "emscripten")),
     feature(integer_atomics, stdsimd)
 )]
-#![cfg_attr(any(unix, target_os = "cloudabi", target_os = "redox"), feature(libc))]
+#![cfg_attr(any(unix, target_os = "redox"), feature(libc))]
 // The minimum alignment guaranteed by the architecture. This value is used to
 // add fast paths for low alignment values.
 #[cfg(all(any(target_arch = "x86",
@@ -69,7 +69,7 @@ const MIN_ALIGN: usize = 16;
 /// independently of the standard library’s global allocator.
 #[stable(feature = "alloc_system_type", since = "1.28.0")]
 pub struct System;
-#[cfg(any(windows, unix, target_os = "cloudabi", target_os = "redox"))]
+#[cfg(any(windows, unix, target_os = "redox"))]
 mod realloc_fallback {
     use core::alloc::{GlobalAlloc, Layout};
     use core::cmp;
@@ -89,7 +89,7 @@ mod realloc_fallback {
         }
     }
 }
-#[cfg(any(unix, target_os = "cloudabi", target_os = "redox"))]
+#[cfg(any(unix, target_os = "redox"))]
 mod platform {
     extern crate libc;
     use core::ptr;

compiler/rustc_target/src/spec/mod.rs

@@ -54,7 +54,6 @@ mod apple_base;
 mod apple_sdk_base;
 mod arm_base;
 mod avr_gnu_base;
-mod cloudabi_base;
 mod dragonfly_base;
 mod freebsd_base;
 mod fuchsia_base;
@@ -628,11 +627,6 @@ supported_targets! {
 
     ("msp430-none-elf", msp430_none_elf),
 
-    ("aarch64-unknown-cloudabi", aarch64_unknown_cloudabi),
-    ("armv7-unknown-cloudabi-eabihf", armv7_unknown_cloudabi_eabihf),
-    ("i686-unknown-cloudabi", i686_unknown_cloudabi),
-    ("x86_64-unknown-cloudabi", x86_64_unknown_cloudabi),
-
     ("aarch64-unknown-hermit", aarch64_unknown_hermit),
     ("x86_64-unknown-hermit", x86_64_unknown_hermit),
     ("x86_64-unknown-hermit-kernel", x86_64_unknown_hermit_kernel),

library/panic_abort/src/lib.rs

@@ -32,7 +32,7 @@ pub unsafe extern "C" fn __rust_start_panic(_payload: usize) -> u32 {
     abort();
 
     cfg_if::cfg_if! {
-        if #[cfg(any(unix, target_os = "cloudabi"))] {
+        if #[cfg(unix)] {
             unsafe fn abort() -> ! {
                 libc::abort();
             }

library/panic_unwind/src/lib.rs

@@ -49,7 +49,6 @@ cfg_if::cfg_if! {
         mod real_imp;
     } else if #[cfg(any(
         all(target_family = "windows", target_env = "gnu"),
-        target_os = "cloudabi",
         target_os = "psp",
         target_family = "unix",
         all(target_vendor = "fortanix", target_env = "sgx"),

library/std/build.rs

@@ -18,7 +18,6 @@ fn main() {
         || target.contains("uwp")
         || target.contains("windows")
         || target.contains("fuchsia")
-        || target.contains("cloudabi")
         || (target.contains("sgx") && target.contains("fortanix"))
         || target.contains("hermit")
         || target.contains("l4re")

library/std/src/fs.rs

@@ -8,7 +8,7 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 #![deny(unsafe_op_in_unsafe_fn)]
 
-#[cfg(all(test, not(any(target_os = "cloudabi", target_os = "emscripten", target_env = "sgx"))))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx"))))]
 mod tests;
 
 use crate::ffi::OsString;

library/std/src/net/tcp.rs

@@ -1,6 +1,6 @@
 #![deny(unsafe_op_in_unsafe_fn)]
 
-#[cfg(all(test, not(any(target_os = "cloudabi", target_os = "emscripten"))))]
+#[cfg(all(test, not(target_os = "emscripten")))]
 mod tests;
 
 use crate::io::prelude::*;

library/std/src/net/udp.rs

@@ -1,4 +1,4 @@
-#[cfg(all(test, not(any(target_os = "cloudabi", target_os = "emscripten", target_env = "sgx"))))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx"))))]
 mod tests;
 
 use crate::fmt;

library/std/src/process.rs

@@ -97,7 +97,7 @@
 #![stable(feature = "process", since = "1.0.0")]
 #![deny(unsafe_op_in_unsafe_fn)]
 
-#[cfg(all(test, not(any(target_os = "cloudabi", target_os = "emscripten", target_env = "sgx"))))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx"))))]
 mod tests;
 
 use crate::io::prelude::*;