Rollup merge of rust-lang#128631 - onur-ozkan:hotfix, r=Mark-Simulacrum

handle crates when they are not specified for std docs

Fixes a regression from rust-lang#128182.

Resolves rust-lang#128610

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

@@ -110,11 +110,17 @@ impl Step for JsonDocs {
         ));
 
         let dest = "share/doc/rust/json";
+        let out = builder.json_doc_out(host);
+
+        // Make sure these are present in the component.
+        for f in ["alloc.json", "core.json", "std.json"] {
+            assert!(out.join(f).exists(), "rust-docs-json is missing `{f}`.");
+        }
 
         let mut tarball = Tarball::new(builder, "rust-docs-json", &host.triple);
         tarball.set_product_name("Rust Documentation In JSON Format");
         tarball.is_preview(true);
-        tarball.add_bulk_dir(builder.json_doc_out(host), dest);
+        tarball.add_bulk_dir(out, dest);
         Some(tarball.generate())
     }
 }

src/bootstrap/src/core/build_steps/doc.rs

@@ -599,6 +599,16 @@ impl Step for Std {
     fn run(self, builder: &Builder<'_>) {
         let stage = self.stage;
         let target = self.target;
+        let crates = if self.crates.is_empty() {
+            builder
+                .in_tree_crates("sysroot", Some(target))
+                .iter()
+                .map(|c| c.name.to_string())
+                .collect()
+        } else {
+            self.crates
+        };
+
         let out = match self.format {
             DocumentationFormat::Html => builder.doc_out(target),
             DocumentationFormat::Json => builder.json_doc_out(target),
@@ -627,7 +637,7 @@ impl Step for Std {
             extra_args.push("--disable-minification");
         }
 
-        doc_std(builder, self.format, stage, target, &out, &extra_args, &self.crates);
+        doc_std(builder, self.format, stage, target, &out, &extra_args, &crates);
 
         // Don't open if the format is json
         if let DocumentationFormat::Json = self.format {
@@ -639,7 +649,7 @@ impl Step for Std {
             let index = out.join("std").join("index.html");
             builder.open_in_browser(index);
         } else {
-            for requested_crate in &*self.crates {
+            for requested_crate in crates {
                 if STD_PUBLIC_CRATES.iter().any(|&k| k == requested_crate) {
                     let index = out.join(requested_crate).join("index.html");
                     builder.open_in_browser(index);