Add x86_64-unknown-trusty as tier 3 target

compiler/rustc_target/src/spec/mod.rs

@@ -1792,6 +1792,7 @@ supported_targets! {
 
     ("armv7-unknown-trusty", armv7_unknown_trusty),
     ("aarch64-unknown-trusty", aarch64_unknown_trusty),
+    ("x86_64-unknown-trusty", x86_64_unknown_trusty),
 
     ("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
     ("riscv32im-risc0-zkvm-elf", riscv32im_risc0_zkvm_elf),

compiler/rustc_target/src/spec/targets/x86_64_unknown_trusty.rs

@@ -0,0 +1,38 @@
+// Trusty OS target for X86_64.
+
+use crate::spec::{
+    LinkSelfContainedDefault, PanicStrategy, RelroLevel, StackProbeType, Target, TargetOptions,
+};
+
+pub(crate) fn target() -> Target {
+    Target {
+        llvm_target: "x86_64-unknown-unknown-musl".into(),
+        metadata: crate::spec::TargetMetadata {
+            description: Some("x86_64 Trusty".into()),
+            tier: Some(3),
+            host_tools: Some(false),
+            std: Some(false),
+        },
+        pointer_width: 64,
+        data_layout:
+            "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128".into(),
+        arch: "x86_64".into(),
+        options: TargetOptions {
+            executables: true,
+            max_atomic_width: Some(64),
+            panic_strategy: PanicStrategy::Abort,
+            os: "trusty".into(),
+            link_self_contained: LinkSelfContainedDefault::InferredForMusl,
+            position_independent_executables: true,
+            static_position_independent_executables: true,
+            crt_static_default: true,
+            crt_static_respected: true,
+            dynamic_linking: false,
+            plt_by_default: false,
+            relro_level: RelroLevel::Full,
+            stack_probes: StackProbeType::Inline,
+            mcount: "\u{1}_mcount".into(),
+            ..Default::default()
+        },
+    }
+}

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

@@ -386,6 +386,7 @@ target | std | host | notes
 [`x86_64-unknown-hermit`](platform-support/hermit.md) | ✓ |  | x86_64 Hermit
 `x86_64-unknown-l4re-uclibc` | ? |  |
 [`x86_64-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | 64-bit OpenBSD
+[`x86_64-unknown-trusty`](platform-support/trusty.md) | ? |  |
 `x86_64-uwp-windows-gnu` | ✓ |  |
 `x86_64-uwp-windows-msvc` | ✓ |  |
 [`x86_64-win7-windows-msvc`](platform-support/win7-windows-msvc.md) | ✓ |   | 64-bit Windows 7 support

tests/assembly/targets/targets-elf.rs

@@ -591,6 +591,9 @@
 //@ revisions: x86_64_unknown_redox
 //@ [x86_64_unknown_redox] compile-flags: --target x86_64-unknown-redox
 //@ [x86_64_unknown_redox] needs-llvm-components: x86
+//@ revisions: x86_64_unknown_trusty
+//@ [x86_64_unknown_trusty] compile-flags: --target x86_64-unknown-trusty
+//@ [x86_64_unknown_trusty] needs-llvm-components: x86
 //@ revisions: x86_64_wrs_vxworks
 //@ [x86_64_wrs_vxworks] compile-flags: --target x86_64-wrs-vxworks
 //@ [x86_64_wrs_vxworks] needs-llvm-components: x86