Use a macro to impl FromStr for target spec data structures

compiler/rustc_codegen_llvm/src/lib.rs

@@ -46,6 +46,7 @@ use rustc_middle::util::Providers;
 use rustc_session::Session;
 use rustc_session::config::{OptLevel, OutputFilenames, PrintKind, PrintRequest};
 use rustc_span::Symbol;
+use rustc_target::spec::{CodeModel, RelocModel, TlsModel};
 
 mod back {
     pub(crate) mod archive;
@@ -267,32 +268,27 @@ impl CodegenBackend for LlvmCodegenBackend {
         match req.kind {
             PrintKind::RelocationModels => {
                 writeln!(out, "Available relocation models:").unwrap();
-                for name in &[
-                    "static",
-                    "pic",
-                    "pie",
-                    "dynamic-no-pic",
-                    "ropi",
-                    "rwpi",
-                    "ropi-rwpi",
-                    "default",
-                ] {
+                for name in RelocModel::ALL
+                    .iter()
+                    .copied()
+                    .map(RelocModel::as_str)
+                    .into_iter()
+                    .chain(["default"])
+                {
                     writeln!(out, "    {name}").unwrap();
                 }
                 writeln!(out).unwrap();
             }
             PrintKind::CodeModels => {
                 writeln!(out, "Available code models:").unwrap();
-                for name in &["tiny", "small", "kernel", "medium", "large"] {
+                for name in CodeModel::ALL.iter().copied().map(CodeModel::as_str) {
                     writeln!(out, "    {name}").unwrap();
                 }
                 writeln!(out).unwrap();
             }
             PrintKind::TlsModels => {
                 writeln!(out, "Available TLS models:").unwrap();
-                for name in
-                    &["global-dynamic", "local-dynamic", "initial-exec", "local-exec", "emulated"]
-                {
+                for name in TlsModel::ALL.iter().copied().map(TlsModel::as_str) {
                     writeln!(out, "    {name}").unwrap();
                 }
                 writeln!(out).unwrap();

compiler/rustc_errors/src/diagnostic_impls.rs

@@ -200,7 +200,7 @@ impl IntoDiagArg for PathBuf {
 
 impl IntoDiagArg for PanicStrategy {
     fn into_diag_arg(self, _: &mut Option<std::path::PathBuf>) -> DiagArgValue {
-        DiagArgValue::Str(Cow::Owned(self.desc().to_string()))
+        DiagArgValue::Str(Cow::Owned(self.as_str().to_string()))
     }
 }
 

compiler/rustc_session/src/config/cfg.rs

@@ -375,11 +375,12 @@ impl CheckCfg {
 
         ins!(sym::overflow_checks, no_values);
 
-        ins!(sym::panic, empty_values).extend(&PanicStrategy::all());
+        ins!(sym::panic, empty_values).extend(PanicStrategy::ALL.iter().map(|p| p.desc_symbol()));
 
         ins!(sym::proc_macro, no_values);
 
-        ins!(sym::relocation_model, empty_values).extend(RelocModel::all());
+        ins!(sym::relocation_model, empty_values)
+            .extend(RelocModel::ALL.iter().map(|m| m.desc_symbol()));
 
         let sanitize_values = SanitizerSet::all()
             .into_iter()