Add the new description field to Target::to_json, and add descriptions for some MSVC targets

Author: dpaoliello

compiler/rustc_target/src/spec/mod.rs

@@ -3251,6 +3251,7 @@ impl ToJson for Target {
         }
 
         target_val!(llvm_target);
+        target_val!(description);
         d.insert("target-pointer-width".to_string(), self.pointer_width.to_string().to_json());
         target_val!(arch);
         target_val!(data_layout);

compiler/rustc_target/src/spec/targets/aarch64_pc_windows_msvc.rs

@@ -1,4 +1,5 @@
 use crate::spec::{base, Target};
+use std::borrow::Cow;
 
 pub fn target() -> Target {
     let mut base = base::windows_msvc::opts();
@@ -7,7 +8,7 @@ pub fn target() -> Target {
 
     Target {
         llvm_target: "aarch64-pc-windows-msvc".into(),
-        description: None,
+        description: Some(Cow::Borrowed("ARM64 Windows MSVC")),
         pointer_width: 64,
         data_layout: "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128".into(),
         arch: "aarch64".into(),

compiler/rustc_target/src/spec/targets/i686_pc_windows_msvc.rs

@@ -1,4 +1,5 @@
 use crate::spec::{base, LinkerFlavor, Lld, SanitizerSet, Target};
+use std::borrow::Cow;
 
 pub fn target() -> Target {
     let mut base = base::windows_msvc::opts();
@@ -23,7 +24,7 @@ pub fn target() -> Target {
 
     Target {
         llvm_target: "i686-pc-windows-msvc".into(),
-        description: None,
+        description: Some(Cow::Borrowed("32-bit MSVC (Windows 7+)")),
         pointer_width: 32,
         data_layout: "e-m:x-p:32:32-p270:32:32-p271:32:32-p272:64:64-\
             i64:64-i128:128-f80:128-n8:16:32-a:0:32-S32"

compiler/rustc_target/src/spec/targets/i686_win7_windows_msvc.rs

@@ -1,4 +1,5 @@
 use crate::spec::{base, LinkerFlavor, Lld, Target};
+use std::borrow::Cow;
 
 pub fn target() -> Target {
     let mut base = base::windows_msvc::opts();
@@ -23,7 +24,7 @@ pub fn target() -> Target {
 
     Target {
         llvm_target: "i686-pc-windows-msvc".into(),
-        description: None,
+        description: Some(Cow::Borrowed("32-bit Windows 7 support")),
         pointer_width: 32,
         data_layout: "e-m:x-p:32:32-p270:32:32-p271:32:32-p272:64:64-\
             i64:64-i128:128-f80:128-n8:16:32-a:0:32-S32"

compiler/rustc_target/src/spec/targets/thumbv7a_pc_windows_msvc.rs

@@ -1,4 +1,5 @@
 use crate::spec::{base, LinkerFlavor, Lld, PanicStrategy, Target, TargetOptions};
+use std::borrow::Cow;
 
 pub fn target() -> Target {
     let mut base = base::windows_msvc::opts();
@@ -13,7 +14,7 @@ pub fn target() -> Target {
 
     Target {
         llvm_target: "thumbv7a-pc-windows-msvc".into(),
-        description: None,
+        description: Some(Cow::Borrowed("ARM64 Windows MSVC")),
         pointer_width: 32,
         data_layout: "e-m:w-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".into(),
         arch: "arm".into(),

compiler/rustc_target/src/spec/targets/x86_64_pc_windows_msvc.rs

@@ -1,4 +1,5 @@
 use crate::spec::{base, SanitizerSet, Target};
+use std::borrow::Cow;
 
 pub fn target() -> Target {
     let mut base = base::windows_msvc::opts();
@@ -10,7 +11,7 @@ pub fn target() -> Target {
 
     Target {
         llvm_target: "x86_64-pc-windows-msvc".into(),
-        description: None,
+        description: Some(Cow::Borrowed("64-bit MSVC (Windows 7+)")),
         pointer_width: 64,
         data_layout:
             "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128".into(),

compiler/rustc_target/src/spec/targets/x86_64_win7_windows_msvc.rs

@@ -1,4 +1,5 @@
 use crate::spec::{base, Target};
+use std::borrow::Cow;
 
 pub fn target() -> Target {
     let mut base = base::windows_msvc::opts();
@@ -9,7 +10,7 @@ pub fn target() -> Target {
 
     Target {
         llvm_target: "x86_64-win7-windows-msvc".into(),
-        description: None,
+        description: Some(Cow::Borrowed("64-bit Windows 7 support")),
         pointer_width: 64,
         data_layout:
             "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128".into(),