add additional information to target spec and supporting docs

Author: tropicaaal

compiler/rustc_target/src/spec/targets/armv7a_vex_v5.rs

@@ -6,29 +6,31 @@ pub(crate) fn target() -> Target {
     Target {
         llvm_target: "armv7a-none-eabihf".into(),
         metadata: crate::spec::TargetMetadata {
-            description: None,
-            tier: None,
-            host_tools: None,
-            std: None,
+            description: Some("Armv7-A Cortex-A9 VEX V5 Brain, VEXos".into()),
+            tier: Some(3),
+            host_tools: Some(false),
+            std: Some(true),
         },
         pointer_width: 32,
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".into(),
         arch: "arm".into(),
         options: TargetOptions {
+            os: "vexos".into(),
+            vendor: "vex".into(),
+            exe_suffix: "elf".into(),
             cpu: "cortex-a9".into(),
             abi: "eabihf".into(),
-            linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes),
+            features: "+v7,+neon,+vfp3,+thumb2,+thumb-mode".into(),
             linker: Some("rust-lld".into()),
+            linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes),
             link_script: Some(LINK_SCRIPT.into()),
-            features: "+v7,+thumb2,+vfp3,+neon".into(),
+            panic_strategy: PanicStrategy::Abort,
             relocation_model: RelocModel::Static,
-            disable_redzone: true,
+            c_enum_min_bits: Some(8),
             max_atomic_width: Some(64),
-            panic_strategy: PanicStrategy::Abort,
+            disable_redzone: true,
             emit_debug_gdb_scripts: false,
-            c_enum_min_bits: Some(8),
-            os: "vexos".into(),
-            vendor: "vex".into(),
+            has_thumb_interworking: true,
             ..Default::default()
         },
     }

src/doc/rustc/src/platform-support.md

@@ -159,7 +159,7 @@ target | std | notes
 `armv7-unknown-linux-musleabihf` | ✓ | Armv7-A Linux with musl 1.2.3, hardfloat
 [`armv7-unknown-linux-ohos`](platform-support/openharmony.md) | ✓ | Armv7-A OpenHarmony
 [`armv7a-none-eabi`](platform-support/arm-none-eabi.md) | * | Bare Armv7-A
-[`armv7a-vex-v5`](platform-support/armv7a-vex-v5.md) | * | Armv7-A Cortex-A9 VEX V5 Brain, vexOS
+[`armv7a-vex-v5`](platform-support/armv7a-vex-v5.md) | * | Armv7-A Cortex-A9 VEX V5 Brain, VEXos
 [`armv7r-none-eabi`](platform-support/armv7r-none-eabi.md) | * | Bare Armv7-R
 [`armv7r-none-eabihf`](platform-support/armv7r-none-eabi.md) | * | Bare Armv7-R, hardfloat
 `i586-pc-windows-msvc` | * | 32-bit Windows w/o SSE [^x86_32-floats-x87]