Rollup merge of rust-lang#68191 - simlay:add-tvSO-target, r=nagisa

Added tvOS as targets

This is a first attempt of adding support tvOS as described in rust-lang#48862. It's got a lot of overlap with [src/librustc_target/spec/apple_ios_base.rs](https://github.com/rust-lang/rust/blob/31dd4f4acbcbdb02b0745d2136399ed664a28050/src/librustc_target/spec/apple_ios_base.rs).

I thought about refactoring `apple_ios_base.rs` to include this as well but that would require each of the ios and tvos targets to be of the something like the form `let base = opts(AppleOS::TV, Arch::Arm64)?;` I also did the same thing for watchOS because from what I can tell, all three targets (iOS, tvOS, and watchOS) have the same logic but have different parameters being sent to `xcrun`. Thoughts?

As far as the `data_layout` and other parameters to `Target`, I did as much research as I could but it really seems that processor in the [iPhone 11 is the same as the apple TV](https://en.wikipedia.org/wiki/Apple-designed_processors) so I didn't change any of those parameters.

I did get this to build and tested that it's actually running the the below logic (because the parameter to `xcrun` is `appletvos` not `tvos`).

I didn't manage to get it to actually compile a file with `fn main(){}` because I don't have the stdlib for `aarch64-apple-tvos` compiled it seems. Is there documentation for this?

Similar to the ending of rust-lang#63467, I'm not sure what to do next.

src/librustc_target/spec/aarch64_apple_ios.rs

@@ -1,8 +1,8 @@
-use super::apple_ios_base::{opts, Arch};
+use super::apple_sdk_base::{opts, AppleOS, Arch};
 use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
 
 pub fn target() -> TargetResult {
-    let base = opts(Arch::Arm64)?;
+    let base = opts(Arch::Arm64, AppleOS::iOS)?;
     Ok(Target {
         llvm_target: "arm64-apple-ios".to_string(),
         target_endian: "little".to_string(),

src/librustc_target/spec/aarch64_apple_tvos.rs

@@ -0,0 +1,25 @@
+use super::apple_sdk_base::{opts, AppleOS, Arch};
+use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
+
+pub fn target() -> TargetResult {
+    let base = opts(Arch::Arm64, AppleOS::tvOS)?;
+    Ok(Target {
+        llvm_target: "arm64-apple-tvos".to_string(),
+        target_endian: "little".to_string(),
+        target_pointer_width: "64".to_string(),
+        target_c_int_width: "32".to_string(),
+        data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".to_string(),
+        arch: "aarch64".to_string(),
+        target_os: "tvos".to_string(),
+        target_env: String::new(),
+        target_vendor: "apple".to_string(),
+        linker_flavor: LinkerFlavor::Gcc,
+        options: TargetOptions {
+            features: "+neon,+fp-armv8,+cyclone".to_string(),
+            eliminate_frame_pointer: false,
+            max_atomic_width: Some(128),
+            abi_blacklist: super::arm_base::abi_blacklist(),
+            ..base
+        },
+    })
+}

src/librustc_target/spec/apple_ios_base.rs → src/librustc_target/spec/apple_sdk_base.rs

@@ -5,7 +5,6 @@ use std::path::Path;
 use std::process::Command;
 
 use Arch::*;
-
 #[allow(non_camel_case_types)]
 #[derive(Copy, Clone)]
 pub enum Arch {
@@ -17,6 +16,13 @@ pub enum Arch {
     X86_64_macabi,
 }
 
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone)]
+pub enum AppleOS {
+    tvOS,
+    iOS,
+}
+
 impl Arch {
     pub fn to_string(self) -> &'static str {
         match self {
@@ -41,6 +47,17 @@ pub fn get_sdk_root(sdk_name: &str) -> Result<String, String> {
         let p = Path::new(&sdkroot);
         match sdk_name {
             // Ignore `SDKROOT` if it's clearly set for the wrong platform.
+            "appletvos"
+                if sdkroot.contains("TVSimulator.platform")
+                    || sdkroot.contains("MacOSX.platform") =>
+            {
+                ()
+            }
+            "appletvsimulator"
+                if sdkroot.contains("TVOS.platform") || sdkroot.contains("MacOSX.platform") =>
+            {
+                ()
+            }
             "iphoneos"
                 if sdkroot.contains("iPhoneSimulator.platform")
                     || sdkroot.contains("MacOSX.platform") =>
@@ -82,11 +99,17 @@ pub fn get_sdk_root(sdk_name: &str) -> Result<String, String> {
     }
 }
 
-fn build_pre_link_args(arch: Arch) -> Result<LinkArgs, String> {
-    let sdk_name = match arch {
-        Armv7 | Armv7s | Arm64 => "iphoneos",
-        I386 | X86_64 => "iphonesimulator",
-        X86_64_macabi => "macosx10.15",
+fn build_pre_link_args(arch: Arch, os: AppleOS) -> Result<LinkArgs, String> {
+    let sdk_name = match (arch, os) {
+        (Arm64, AppleOS::tvOS) => "appletvos",
+        (X86_64, AppleOS::tvOS) => "appletvsimulator",
+        (Armv7, AppleOS::iOS) => "iphoneos",
+        (Armv7s, AppleOS::iOS) => "iphoneos",
+        (Arm64, AppleOS::iOS) => "iphoneos",
+        (I386, AppleOS::iOS) => "iphonesimulator",
+        (X86_64, AppleOS::iOS) => "iphonesimulator",
+        (X86_64_macabi, AppleOS::iOS) => "macosx10.15",
+        _ => unreachable!(),
     };
 
     let arch_name = arch.to_string();
@@ -128,8 +151,8 @@ fn link_env_remove(arch: Arch) -> Vec<String> {
     }
 }
 
-pub fn opts(arch: Arch) -> Result<TargetOptions, String> {
-    let pre_link_args = build_pre_link_args(arch)?;
+pub fn opts(arch: Arch, os: AppleOS) -> Result<TargetOptions, String> {
+    let pre_link_args = build_pre_link_args(arch, os)?;
     Ok(TargetOptions {
         cpu: target_cpu(arch),
         dynamic_linking: false,

src/librustc_target/spec/armv7_apple_ios.rs

@@ -1,8 +1,8 @@
-use super::apple_ios_base::{opts, Arch};
+use super::apple_sdk_base::{opts, AppleOS, Arch};
 use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
 
 pub fn target() -> TargetResult {
-    let base = opts(Arch::Armv7)?;
+    let base = opts(Arch::Armv7, AppleOS::iOS)?;
     Ok(Target {
         llvm_target: "armv7-apple-ios".to_string(),
         target_endian: "little".to_string(),

src/librustc_target/spec/armv7s_apple_ios.rs

@@ -1,8 +1,8 @@
-use super::apple_ios_base::{opts, Arch};
+use super::apple_sdk_base::{opts, AppleOS, Arch};
 use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
 
 pub fn target() -> TargetResult {
-    let base = opts(Arch::Armv7s)?;
+    let base = opts(Arch::Armv7s, AppleOS::iOS)?;
     Ok(Target {
         llvm_target: "armv7s-apple-ios".to_string(),
         target_endian: "little".to_string(),

src/librustc_target/spec/i386_apple_ios.rs

@@ -1,8 +1,8 @@
-use super::apple_ios_base::{opts, Arch};
+use super::apple_sdk_base::{opts, AppleOS, Arch};
 use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
 
 pub fn target() -> TargetResult {
-    let base = opts(Arch::I386)?;
+    let base = opts(Arch::I386, AppleOS::iOS)?;
     Ok(Target {
         llvm_target: "i386-apple-ios".to_string(),
         target_endian: "little".to_string(),

src/librustc_target/spec/mod.rs

@@ -47,7 +47,7 @@ use rustc_macros::HashStable_Generic;
 pub mod abi;
 mod android_base;
 mod apple_base;
-mod apple_ios_base;
+mod apple_sdk_base;
 mod arm_base;
 mod cloudabi_base;
 mod dragonfly_base;
@@ -434,6 +434,8 @@ supported_targets! {
     ("armv7-apple-ios", armv7_apple_ios),
     ("armv7s-apple-ios", armv7s_apple_ios),
     ("x86_64-apple-ios-macabi", x86_64_apple_ios_macabi),
+    ("aarch64-apple-tvos", aarch64_apple_tvos),
+    ("x86_64-apple-tvos", x86_64_apple_tvos),
 
     ("armebv7r-none-eabi", armebv7r_none_eabi),
     ("armebv7r-none-eabihf", armebv7r_none_eabihf),

src/librustc_target/spec/x86_64_apple_ios.rs

@@ -1,8 +1,8 @@
-use super::apple_ios_base::{opts, Arch};
+use super::apple_sdk_base::{opts, AppleOS, Arch};
 use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
 
 pub fn target() -> TargetResult {
-    let base = opts(Arch::X86_64)?;
+    let base = opts(Arch::X86_64, AppleOS::iOS)?;
     Ok(Target {
         llvm_target: "x86_64-apple-ios".to_string(),
         target_endian: "little".to_string(),

src/librustc_target/spec/x86_64_apple_ios_macabi.rs

@@ -1,8 +1,8 @@
-use super::apple_ios_base::{opts, Arch};
+use super::apple_sdk_base::{opts, AppleOS, Arch};
 use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
 
 pub fn target() -> TargetResult {
-    let base = opts(Arch::X86_64_macabi)?;
+    let base = opts(Arch::X86_64_macabi, AppleOS::iOS)?;
     Ok(Target {
         llvm_target: "x86_64-apple-ios13.0-macabi".to_string(),
         target_endian: "little".to_string(),

src/librustc_target/spec/x86_64_apple_tvos.rs

@@ -0,0 +1,19 @@
+use super::apple_sdk_base::{opts, AppleOS, Arch};
+use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
+
+pub fn target() -> TargetResult {
+    let base = opts(Arch::X86_64, AppleOS::iOS)?;
+    Ok(Target {
+        llvm_target: "x86_64-apple-tvos".to_string(),
+        target_endian: "little".to_string(),
+        target_pointer_width: "64".to_string(),
+        target_c_int_width: "32".to_string(),
+        data_layout: "e-m:o-i64:64-f80:128-n8:16:32:64-S128".to_string(),
+        arch: "x86_64".to_string(),
+        target_os: "tvos".to_string(),
+        target_env: String::new(),
+        target_vendor: "apple".to_string(),
+        linker_flavor: LinkerFlavor::Gcc,
+        options: TargetOptions { max_atomic_width: Some(64), stack_probes: true, ..base },
+    })
+}