Accept old spelling of Fuchsia target triples

Because the old spelling is widely used, some projects may need time to
migrate their uses to the new triple spelling. The old spelling may
eventually be removed altogether.

Author: djkoloski

compiler/rustc_target/src/spec/aarch64_fuchsia.rs

@@ -0,0 +1 @@
+pub use crate::spec::aarch64_unknown_fuchsia::target;

compiler/rustc_target/src/spec/mod.rs

@@ -981,7 +981,7 @@ impl fmt::Display for StackProtector {
 }
 
 macro_rules! supported_targets {
-    ( $(($triple:literal, $module:ident ),)+ ) => {
+    ( $(($triple:literal, $module:ident),)+ ) => {
         $(mod $module;)+
 
         /// List of supported targets
@@ -1109,7 +1109,11 @@ supported_targets! {
     ("x86_64-apple-darwin", x86_64_apple_darwin),
     ("i686-apple-darwin", i686_apple_darwin),
 
+    // FIXME(fuchsia): Remove aarch64-fuchsia in favor of aarch64-unknown-fuchsia
+    ("aarch64-fuchsia", aarch64_fuchsia),
     ("aarch64-unknown-fuchsia", aarch64_unknown_fuchsia),
+    // FIXME(fuchsia): Remove x86_64-fuchsia in favor of x86_64-unknown-fuchsia
+    ("x86_64-fuchsia", x86_64_fuchsia),
     ("x86_64-unknown-fuchsia", x86_64_unknown_fuchsia),
 
     ("avr-unknown-gnu-atmega328", avr_unknown_gnu_atmega328),

compiler/rustc_target/src/spec/x86_64_fuchsia.rs

@@ -0,0 +1 @@
+pub use crate::spec::x86_64_unknown_fuchsia::target;

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

@@ -124,6 +124,7 @@ target | std | notes
 -------|:---:|-------
 `aarch64-apple-ios` | ✓ | ARM64 iOS
 [`aarch64-apple-ios-sim`](platform-support/aarch64-apple-ios-sim.md) | ✓ | Apple iOS Simulator on ARM64
+`aarch64-fuchsia` | ✓ | Alias for `aarch64-unknown-fuchsia`
 `aarch64-unknown-fuchsia` | ✓ | ARM64 Fuchsia
 [`aarch64-linux-android`](platform-support/android.md) | ✓ | ARM64 Android
 `aarch64-unknown-none-softfloat` | * | Bare ARM64, softfloat
@@ -177,6 +178,7 @@ target | std | notes
 `wasm32-wasi` | ✓ | WebAssembly with WASI
 `x86_64-apple-ios` | ✓ | 64-bit x86 iOS
 [`x86_64-fortanix-unknown-sgx`](platform-support/x86_64-fortanix-unknown-sgx.md) | ✓ | [Fortanix ABI] for 64-bit Intel SGX
+`x86_64-fuchsia` | ✓ | Alias for `x86_64-unknown-fuchsia`
 `x86_64-unknown-fuchsia` | ✓ | 64-bit Fuchsia
 [`x86_64-linux-android`](platform-support/android.md) | ✓ | 64-bit x86 Android
 `x86_64-pc-solaris` | ✓ | 64-bit Solaris 10/11, illumos