Review remarks

src/bootstrap/src/core/build_steps/compile.rs

@@ -1606,7 +1606,7 @@ impl Step for GccCodegenBackend {
         let _guard = builder.msg_rustc_tool(
             Kind::Build,
             build_compiler.stage,
-            format_args!("codegen backend gcc"),
+            "codegen backend gcc",
             build_compiler.host,
             target,
         );
@@ -1690,7 +1690,7 @@ impl Step for CraneliftCodegenBackend {
         let _guard = builder.msg_rustc_tool(
             Kind::Build,
             build_compiler.stage,
-            format_args!("codegen backend cranelift"),
+            "codegen backend cranelift",
             build_compiler.host,
             target,
         );
@@ -1712,32 +1712,28 @@ fn write_codegen_backend_stamp(
     files: Vec<PathBuf>,
     dry_run: bool,
 ) -> BuildStamp {
-    if !dry_run {
-        let mut files = files.into_iter().filter(|f| {
-            let filename = f.file_name().unwrap().to_str().unwrap();
-            is_dylib(f) && filename.contains("rustc_codegen_")
-        });
-        let codegen_backend = match files.next() {
-            Some(f) => f,
-            None => panic!("no dylibs built for codegen backend?"),
-        };
-        if let Some(f) = files.next() {
-            panic!(
-                "codegen backend built two dylibs:\n{}\n{}",
-                codegen_backend.display(),
-                f.display()
-            );
-        }
-
-        let codegen_backend = codegen_backend.to_str().unwrap();
-        stamp = stamp.add_stamp(codegen_backend);
-        t!(stamp.write());
+    if dry_run {
+        return stamp;
     }
+
+    let mut files = files.into_iter().filter(|f| {
+        let filename = f.file_name().unwrap().to_str().unwrap();
+        is_dylib(f) && filename.contains("rustc_codegen_")
+    });
+    let codegen_backend = match files.next() {
+        Some(f) => f,
+        None => panic!("no dylibs built for codegen backend?"),
+    };
+    if let Some(f) = files.next() {
+        panic!("codegen backend built two dylibs:\n{}\n{}", codegen_backend.display(), f.display());
+    }
+
+    let codegen_backend = codegen_backend.to_str().unwrap();
+    stamp = stamp.add_stamp(codegen_backend);
+    t!(stamp.write());
     stamp
 }
 
-pub(crate) const CODEGEN_BACKEND_PREFIX: &str = "rustc_codegen_";
-
 /// Creates the `codegen-backends` folder for a compiler that's about to be
 /// assembled as a complete compiler.
 ///

src/bootstrap/src/core/build_steps/dist.rs

@@ -1401,7 +1401,7 @@ impl Step for CraneliftCodegenBackend {
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
         // We only want to build the cranelift backend in `x dist` if the backend was enabled
         // in rust.codegen-backends.
-        // Sadly, we don't have access to the actual for which we're disting clif here..
+        // Sadly, we don't have access to the actual target for which we're disting clif here..
         // So we just use the host target.
         let clif_enabled_by_default = run
             .builder

src/bootstrap/src/core/config/toml/rust.rs

@@ -3,7 +3,6 @@
 
 use serde::{Deserialize, Deserializer};
 
-use crate::core::build_steps::compile::CODEGEN_BACKEND_PREFIX;
 use crate::core::config::toml::TomlConfig;
 use crate::core::config::{DebuginfoLevel, Merge, ReplaceOpt, StringOrBool};
 use crate::{BTreeSet, CodegenBackendKind, HashSet, PathBuf, TargetSelection, define_config, exit};
@@ -391,6 +390,8 @@ pub(crate) fn parse_codegen_backends(
     backends: Vec<String>,
     section: &str,
 ) -> Vec<CodegenBackendKind> {
+    const CODEGEN_BACKEND_PREFIX: &str = "rustc_codegen_";
+
     let mut found_backends = vec![];
     for backend in &backends {
         if let Some(stripped) = backend.strip_prefix(CODEGEN_BACKEND_PREFIX) {