From 7c3d096b0dcb39ad23b42394d889ec8177f7ce26 Mon Sep 17 00:00:00 2001
From: "Eddy (Eduard) Stefes" <eddy@linux.ibm.com>
Date: Fri, 6 Feb 2026 10:53:59 +0100
Subject: [PATCH] allow for variant aliases in  target_spec_enum!

---
 compiler/rustc_target/src/lib.rs | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/compiler/rustc_target/src/lib.rs b/compiler/rustc_target/src/lib.rs
index dfa1b2320718..1dc62cb3659c 100644
--- a/compiler/rustc_target/src/lib.rs
+++ b/compiler/rustc_target/src/lib.rs
@@ -76,7 +76,7 @@ macro_rules! target_spec_enum {
         pub enum $Name:ident {
             $(
                 $( #[$variant_attr:meta] )*
-                $Variant:ident = $string:literal,
+                $Variant:ident = $string:literal $(,$alias:literal)* ,
             )*
         }
         parse_error_type = $parse_error_type:literal;
@@ -88,6 +88,7 @@ macro_rules! target_spec_enum {
             $(
                 $( #[$variant_attr] )*
                 #[serde(rename = $string)] // for JSON schema generation only
+                $( #[serde(alias = $alias)] )*
                 $Variant,
             )*
         }
@@ -97,7 +98,10 @@ macro_rules! target_spec_enum {
 
             fn from_str(s: &str) -> Result<Self, Self::Err> {
                 Ok(match s {
-                    $( $string => Self::$Variant, )*
+                    $(
+                        $string => Self::$Variant,
+                        $($alias => Self::$Variant,)*
+                    )*
                     _ => {
                         let all = [$( concat!("'", $string, "'") ),*].join(", ");
                         return Err(format!("invalid {}: '{s}'. allowed values: {all}", $parse_error_type));
@@ -123,7 +127,7 @@ macro_rules! target_spec_enum {
         pub enum $Name:ident {
             $(
                 $( #[$variant_attr:meta] )*
-                $Variant:ident = $string:literal,
+                $Variant:ident = $string:literal $(,$alias:literal)* ,
             )*
         }
         $( #[$other_variant_attr:meta] )*
@@ -134,6 +138,7 @@ macro_rules! target_spec_enum {
         pub enum $Name {
             $(
                 $( #[$variant_attr:meta] )*
+                 $( #[serde(alias = $alias)] )*
                 $Variant,
             )*
             /// The vast majority of the time, the compiler deals with a fixed
@@ -165,7 +170,10 @@ macro_rules! target_spec_enum {
 
             fn from_str(s: &str) -> Result<Self, Self::Err> {
                 Ok(match s {
-                    $( $string => Self::$Variant, )*
+                    $(
+                        $string => Self::$Variant,
+                        $($alias => Self::$Variant,)*
+                    )*
                     _ => Self::$OtherVariant(s.to_owned().into()),
                 })
             }