Remove cargo workspace to build rustdoc-gui test crates because of cargo config not being applied

Cargo.toml

@@ -40,6 +40,7 @@ members = [
 exclude = [
   "build",
   "compiler/rustc_codegen_cranelift",
+  "src/test/rustdoc-gui",
   # HACK(eddyb) This hardcodes the fact that our CI uses `/checkout/obj`.
   "obj",
   # The `x` binary is a thin wrapper that calls `x.py`, which initializes

src/bootstrap/test.rs

@@ -907,18 +907,27 @@ fn run(self, builder: &Builder<'_>) {
         // We remove existing folder to be sure there won't be artifacts remaining.
         let _ = fs::remove_dir_all(&out_dir);
 
-        let src_path = "src/test/rustdoc-gui/src";
+        let src_path = builder.build.src.join("src/test/rustdoc-gui/src");
         // We generate docs for the libraries present in the rustdoc-gui's src folder.
-        let mut cargo = Command::new(&builder.initial_cargo);
-        cargo
-            .arg("doc")
-            .arg("--workspace")
-            .arg("--target-dir")
-            .arg(&out_dir)
-            .env("RUSTDOC", builder.rustdoc(self.compiler))
-            .env("RUSTC", builder.rustc(self.compiler))
-            .current_dir(&builder.build.src.join(src_path));
-        builder.run(&mut cargo);
+        for entry in src_path.read_dir().expect("read_dir call failed") {
+            if let Ok(entry) = entry {
+                let path = entry.path();
+
+                if !path.is_dir() {
+                    continue;
+                }
+
+                let mut cargo = Command::new(&builder.initial_cargo);
+                cargo
+                    .arg("doc")
+                    .arg("--target-dir")
+                    .arg(&out_dir)
+                    .env("RUSTDOC", builder.rustdoc(self.compiler))
+                    .env("RUSTC", builder.rustc(self.compiler))
+                    .current_dir(path);
+                builder.run(&mut cargo);
+            }
+        }
 
         // We now run GUI tests.
         let mut command = Command::new(&nodejs);

src/test/rustdoc-gui/src/Cargo.lock

@@ -1,18 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "implementors"
-version = "0.1.0"
-
-[[package]]
-name = "lib2"
-version = "0.1.0"
-dependencies = [
- "implementors",
-]
-
-[[package]]
-name = "test_docs"
-version = "0.1.0"

src/test/rustdoc-gui/src/Cargo.toml

@@ -1,6 +0,0 @@
-[workspace]
-members = [
-    "test_docs",
-    "lib2",
-    "implementors",
-]