Auto merge of rust-lang#77729 - petrochenkov:mergetarg, r=Mark-Simula…

…crum

rustc_target: Move some target options from `Target` to `TargetOptions`

The only reason for `Target` to `TargetOptions` to be separate structures is that options in `TargetOptions` have reasonable defaults and options in `Target` don't.
(Otherwise all the options logically belong to a single `Target` struct.)

This PR moves a number of options with reasonable defaults from `Target` to `TargetOptions`, so they no longer needs to be specified explicitly for majority of the targets.
The move also allows to inherit the options from `rustc_target/src/spec/*_base.rs` files in a nicer way.
I didn't change any specific option values here.

The moved options are `target_c_int_width` (defaults to `"32"`), `target_endian` (defaults to `"little"`), `target_os` (defaults to `"none"`), `target_env` (defaults to `""`), `target_vendor` (defaults to `"unknown"`) and `linker_flavor` (defaults to `LinkerFlavor::Gcc`).

Next steps (in later PRs):
- Find a way to merge `TargetOptions` into `Target`
- If not, always access `TargetOptions` fields through `Deref` making it a part of `Target` at least logically (`session.target.target.options.foo` -> `session.target.target.foo`)
- ~Eliminate `session::config::Config` and use `Target` instead (`session.target.target.foo` -> `session.target.foo`)~ Done in rust-lang#77943.
- Avoid tautologies in option names (`target.target_os` -> `target.os`)
- Resolve _ rust-lang#77730 (rustc_target: The differences between `target_os = "none"` and `target_os = "unknown"`, and `target_vendor = "unknown"` and `target_vendor = ""` are unclear) noticed during implementation of this PR.

compiler/rustc_target/src/spec/aarch64_apple_darwin.rs

@@ -1,7 +1,7 @@
 use crate::spec::{LinkerFlavor, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let mut base = super::apple_base::opts();
+    let mut base = super::apple_base::opts("macos");
     base.cpu = "apple-a12".to_string();
     base.max_atomic_width = Some(128);
     base.pre_link_args.insert(LinkerFlavor::Gcc, vec!["-arch".to_string(), "arm64".to_string()]);
@@ -16,15 +16,9 @@ pub fn target() -> Target {
 
     Target {
         llvm_target,
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".to_string(),
         arch: arch.to_string(),
-        target_os: "macos".to_string(),
-        target_env: String::new(),
-        target_vendor: "apple".to_string(),
-        linker_flavor: LinkerFlavor::Gcc,
         options: TargetOptions { target_mcount: "\u{1}mcount".to_string(), ..base },
     }
 }

compiler/rustc_target/src/spec/aarch64_apple_ios.rs

@@ -1,19 +1,13 @@
 use super::apple_sdk_base::{opts, Arch};
-use crate::spec::{LinkerFlavor, Target, TargetOptions};
+use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = opts(Arch::Arm64);
+    let base = opts("ios", Arch::Arm64);
     Target {
         llvm_target: "arm64-apple-ios".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        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: "ios".to_string(),
-        target_env: String::new(),
-        target_vendor: "apple".to_string(),
-        linker_flavor: LinkerFlavor::Gcc,
         options: TargetOptions {
             features: "+neon,+fp-armv8,+apple-a7".to_string(),
             eliminate_frame_pointer: false,

compiler/rustc_target/src/spec/aarch64_apple_tvos.rs

@@ -1,19 +1,13 @@
 use super::apple_sdk_base::{opts, Arch};
-use crate::spec::{LinkerFlavor, Target, TargetOptions};
+use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = opts(Arch::Arm64);
+    let base = opts("tvos", Arch::Arm64);
     Target {
         llvm_target: "arm64-apple-tvos".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        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,+apple-a7".to_string(),
             eliminate_frame_pointer: false,

compiler/rustc_target/src/spec/aarch64_fuchsia.rs

@@ -1,20 +1,14 @@
-use crate::spec::{LinkerFlavor, LldFlavor, Target, TargetOptions};
+use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
     let mut base = super::fuchsia_base::opts();
     base.max_atomic_width = Some(128);
 
     Target {
         llvm_target: "aarch64-fuchsia".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "fuchsia".to_string(),
-        target_env: String::new(),
-        target_vendor: String::new(),
-        linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
         options: TargetOptions { unsupported_abis: super::arm_base::unsupported_abis(), ..base },
     }
 }

compiler/rustc_target/src/spec/aarch64_linux_android.rs

@@ -1,4 +1,4 @@
-use crate::spec::{LinkerFlavor, Target, TargetOptions};
+use crate::spec::{Target, TargetOptions};
 
 // See https://developer.android.com/ndk/guides/abis.html#arm64-v8a
 // for target ABI requirements.
@@ -11,15 +11,9 @@ pub fn target() -> Target {
     base.features = "+neon,+fp-armv8".to_string();
     Target {
         llvm_target: "aarch64-linux-android".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "android".to_string(),
-        target_env: String::new(),
-        target_vendor: "unknown".to_string(),
-        linker_flavor: LinkerFlavor::Gcc,
         options: TargetOptions { unsupported_abis: super::arm_base::unsupported_abis(), ..base },
     }
 }

compiler/rustc_target/src/spec/aarch64_pc_windows_msvc.rs

@@ -1,4 +1,4 @@
-use crate::spec::{LinkerFlavor, Target};
+use crate::spec::Target;
 
 pub fn target() -> Target {
     let mut base = super::windows_msvc_base::opts();
@@ -8,15 +8,9 @@ pub fn target() -> Target {
 
     Target {
         llvm_target: "aarch64-pc-windows-msvc".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
         data_layout: "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "windows".to_string(),
-        target_env: "msvc".to_string(),
-        target_vendor: "pc".to_string(),
-        linker_flavor: LinkerFlavor::Msvc,
         options: base,
     }
 }

compiler/rustc_target/src/spec/aarch64_unknown_cloudabi.rs

@@ -1,4 +1,4 @@
-use crate::spec::{LinkerFlavor, Target};
+use crate::spec::Target;
 
 pub fn target() -> Target {
     let mut base = super::cloudabi_base::opts();
@@ -8,15 +8,9 @@ pub fn target() -> Target {
 
     Target {
         llvm_target: "aarch64-unknown-cloudabi".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "cloudabi".to_string(),
-        target_env: String::new(),
-        target_vendor: "unknown".to_string(),
-        linker_flavor: LinkerFlavor::Gcc,
         options: base,
     }
 }

compiler/rustc_target/src/spec/aarch64_unknown_freebsd.rs

@@ -1,20 +1,14 @@
-use crate::spec::{LinkerFlavor, Target, TargetOptions};
+use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
     let mut base = super::freebsd_base::opts();
     base.max_atomic_width = Some(128);
 
     Target {
         llvm_target: "aarch64-unknown-freebsd".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "freebsd".to_string(),
-        target_env: String::new(),
-        target_vendor: "unknown".to_string(),
-        linker_flavor: LinkerFlavor::Gcc,
         options: TargetOptions { unsupported_abis: super::arm_base::unsupported_abis(), ..base },
     }
 }

compiler/rustc_target/src/spec/aarch64_unknown_hermit.rs

@@ -1,20 +1,14 @@
-use crate::spec::{LinkerFlavor, LldFlavor, Target};
+use crate::spec::Target;
 
 pub fn target() -> Target {
     let mut base = super::hermit_base::opts();
     base.max_atomic_width = Some(128);
 
     Target {
         llvm_target: "aarch64-unknown-hermit".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "hermit".to_string(),
-        target_env: String::new(),
-        target_vendor: "unknown".to_string(),
-        linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
         options: base,
     }
 }

compiler/rustc_target/src/spec/aarch64_unknown_linux_gnu.rs

@@ -1,20 +1,14 @@
-use crate::spec::{LinkerFlavor, Target, TargetOptions};
+use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
     let mut base = super::linux_base::opts();
     base.max_atomic_width = Some(128);
 
     Target {
         llvm_target: "aarch64-unknown-linux-gnu".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
-        target_env: "gnu".to_string(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "linux".to_string(),
-        target_vendor: "unknown".to_string(),
-        linker_flavor: LinkerFlavor::Gcc,
         options: TargetOptions {
             unsupported_abis: super::arm_base::unsupported_abis(),
             target_mcount: "\u{1}_mcount".to_string(),

compiler/rustc_target/src/spec/aarch64_unknown_linux_musl.rs

@@ -1,20 +1,14 @@
-use crate::spec::{LinkerFlavor, Target, TargetOptions};
+use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
     let mut base = super::linux_musl_base::opts();
     base.max_atomic_width = Some(128);
 
     Target {
         llvm_target: "aarch64-unknown-linux-musl".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
-        target_env: "musl".to_string(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "linux".to_string(),
-        target_vendor: "unknown".to_string(),
-        linker_flavor: LinkerFlavor::Gcc,
         options: TargetOptions {
             unsupported_abis: super::arm_base::unsupported_abis(),
             target_mcount: "\u{1}_mcount".to_string(),

compiler/rustc_target/src/spec/aarch64_unknown_netbsd.rs

@@ -1,4 +1,4 @@
-use crate::spec::{LinkerFlavor, Target, TargetOptions};
+use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
     let mut base = super::netbsd_base::opts();
@@ -7,15 +7,9 @@ pub fn target() -> Target {
 
     Target {
         llvm_target: "aarch64-unknown-netbsd".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "netbsd".to_string(),
-        target_env: String::new(),
-        target_vendor: "unknown".to_string(),
-        linker_flavor: LinkerFlavor::Gcc,
         options: TargetOptions { target_mcount: "__mcount".to_string(), ..base },
     }
 }

compiler/rustc_target/src/spec/aarch64_unknown_none.rs

@@ -10,6 +10,8 @@ use super::{LinkerFlavor, LldFlavor, PanicStrategy, RelocModel, Target, TargetOp
 
 pub fn target() -> Target {
     let opts = TargetOptions {
+        target_vendor: String::new(),
+        linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
         linker: Some("rust-lld".to_owned()),
         features: "+strict-align,+neon,+fp-armv8".to_string(),
         executables: true,
@@ -23,15 +25,9 @@ pub fn target() -> Target {
     };
     Target {
         llvm_target: "aarch64-unknown-none".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
-        target_os: "none".to_string(),
-        target_env: String::new(),
-        target_vendor: String::new(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
         options: opts,
     }
 }

compiler/rustc_target/src/spec/aarch64_unknown_none_softfloat.rs

@@ -10,6 +10,8 @@ use super::{LinkerFlavor, LldFlavor, PanicStrategy, RelocModel, Target, TargetOp
 
 pub fn target() -> Target {
     let opts = TargetOptions {
+        target_vendor: String::new(),
+        linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
         linker: Some("rust-lld".to_owned()),
         features: "+strict-align,-neon,-fp-armv8".to_string(),
         executables: true,
@@ -23,15 +25,9 @@ pub fn target() -> Target {
     };
     Target {
         llvm_target: "aarch64-unknown-none".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
-        target_os: "none".to_string(),
-        target_env: String::new(),
-        target_vendor: String::new(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
         options: opts,
     }
 }

compiler/rustc_target/src/spec/aarch64_unknown_openbsd.rs

@@ -1,4 +1,4 @@
-use crate::spec::{LinkerFlavor, Target};
+use crate::spec::Target;
 
 pub fn target() -> Target {
     let mut base = super::openbsd_base::opts();
@@ -7,15 +7,9 @@ pub fn target() -> Target {
 
     Target {
         llvm_target: "aarch64-unknown-openbsd".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "openbsd".to_string(),
-        target_env: String::new(),
-        target_vendor: "unknown".to_string(),
-        linker_flavor: LinkerFlavor::Gcc,
         options: base,
     }
 }

compiler/rustc_target/src/spec/aarch64_unknown_redox.rs

@@ -1,20 +1,14 @@
-use crate::spec::{LinkerFlavor, Target};
+use crate::spec::Target;
 
 pub fn target() -> Target {
     let mut base = super::redox_base::opts();
     base.max_atomic_width = Some(128);
 
     Target {
         llvm_target: "aarch64-unknown-redox".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "redox".to_string(),
-        target_env: "relibc".to_string(),
-        target_vendor: "unknown".to_string(),
-        linker_flavor: LinkerFlavor::Gcc,
         options: base,
     }
 }

compiler/rustc_target/src/spec/aarch64_uwp_windows_msvc.rs

@@ -1,4 +1,4 @@
-use crate::spec::{LinkerFlavor, Target};
+use crate::spec::Target;
 
 pub fn target() -> Target {
     let mut base = super::windows_uwp_msvc_base::opts();
@@ -7,15 +7,9 @@ pub fn target() -> Target {
 
     Target {
         llvm_target: "aarch64-pc-windows-msvc".to_string(),
-        target_endian: "little".to_string(),
         pointer_width: 64,
-        target_c_int_width: "32".to_string(),
         data_layout: "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        target_os: "windows".to_string(),
-        target_env: "msvc".to_string(),
-        target_vendor: "uwp".to_string(),
-        linker_flavor: LinkerFlavor::Msvc,
         options: base,
     }
 }