Add big-endian and ILP32 AArch64 targets

compiler/rustc_target/src/spec/aarch64_be_unknown_linux_gnu.rs

@@ -0,0 +1,20 @@
+use crate::abi::Endian;
+use crate::spec::{Target, TargetOptions};
+
+pub fn target() -> Target {
+    let mut base = super::linux_gnu_base::opts();
+    base.max_atomic_width = Some(128);
+
+    Target {
+        llvm_target: "aarch64_be-unknown-linux-gnu".to_string(),
+        pointer_width: 64,
+        data_layout: "E-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
+        arch: "aarch64".to_string(),
+        options: TargetOptions {
+            unsupported_abis: super::arm_base::unsupported_abis(),
+            mcount: "\u{1}_mcount".to_string(),
+            endian: Endian::Big,
+            ..base
+        },
+    }
+}

compiler/rustc_target/src/spec/aarch64_be_unknown_linux_gnu_ilp32.rs

@@ -0,0 +1,20 @@
+use crate::abi::Endian;
+use crate::spec::{Target, TargetOptions};
+
+pub fn target() -> Target {
+    let mut base = super::linux_gnu_base::opts();
+    base.max_atomic_width = Some(128);
+
+    Target {
+        llvm_target: "aarch64_be-unknown-linux-gnu_ilp32".to_string(),
+        pointer_width: 32,
+        data_layout: "E-m:e-p:32:32-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
+        arch: "aarch64".to_string(),
+        options: TargetOptions {
+            unsupported_abis: super::arm_base::unsupported_abis(),
+            mcount: "\u{1}_mcount".to_string(),
+            endian: Endian::Big,
+            ..base
+        },
+    }
+}

compiler/rustc_target/src/spec/aarch64_unknown_linux_gnu_ilp32.rs

@@ -0,0 +1,18 @@
+use crate::spec::{Target, TargetOptions};
+
+pub fn target() -> Target {
+    let mut base = super::linux_gnu_base::opts();
+    base.max_atomic_width = Some(128);
+
+    Target {
+        llvm_target: "aarch64-unknown-linux-gnu_ilp32".to_string(),
+        pointer_width: 32,
+        data_layout: "e-m:e-p:32:32-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
+        arch: "aarch64".to_string(),
+        options: TargetOptions {
+            unsupported_abis: super::arm_base::unsupported_abis(),
+            mcount: "\u{1}_mcount".to_string(),
+            ..base
+        },
+    }
+}

compiler/rustc_target/src/spec/mod.rs

@@ -745,6 +745,10 @@ supported_targets! {
     ("mipsel-sony-psp", mipsel_sony_psp),
     ("mipsel-unknown-none", mipsel_unknown_none),
     ("thumbv4t-none-eabi", thumbv4t_none_eabi),
+
+    ("aarch64_be-unknown-linux-gnu", aarch64_be_unknown_linux_gnu),
+    ("aarch64-unknown-linux-gnu_ilp32", aarch64_unknown_linux_gnu_ilp32),
+    ("aarch64_be-unknown-linux-gnu_ilp32", aarch64_be_unknown_linux_gnu_ilp32),
 }
 
 /// Everything `rustc` knows about how to compile for a specific target.