4 files changed, 36 insertions, 4 deletions
diff --git a/src/bootstrap/bin/rustdoc.rs b/src/bootstrap/bin/rustdoc.rs
index 36beec3a944..085f243785c 100644
--- a/src/bootstrap/bin/rustdoc.rs
+++ b/src/bootstrap/bin/rustdoc.rs
@@ -35,7 +35,7 @@ fn main() {
         .arg("--cfg")
         .arg("dox")
         .arg("--sysroot")
-        .arg(sysroot)
+        .arg(&sysroot)
         .env(bootstrap::util::dylib_path_var(),
              env::join_paths(&dylib_path).unwrap());
 
@@ -72,7 +72,13 @@ fn main() {
     }
 
     if verbose > 1 {
-        eprintln!("rustdoc command: {:?}", cmd);
+        eprintln!(
+            "rustdoc command: {:?}={:?} {:?}",
+            bootstrap::util::dylib_path_var(),
+            env::join_paths(&dylib_path).unwrap(),
+            cmd,
+        );
+        eprintln!("sysroot: {:?}", sysroot);
         eprintln!("libdir: {:?}", libdir);
     }
 
diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index ffd23e72e80..daa6749f87f 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -408,11 +408,11 @@ impl<'a> Builder<'a> {
                 test::RustdocJSStd,
                 test::RustdocJSNotStd,
                 test::RustdocTheme,
+                test::RustdocUi,
                 // Run bootstrap close to the end as it's unlikely to fail
                 test::Bootstrap,
                 // Run run-make last, since these won't pass without make on Windows
                 test::RunMake,
-                test::RustdocUi
             ),
             Kind::Bench => describe!(test::Crate, test::CrateLibrustc),
             Kind::Doc => describe!(
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index 9317a40545e..976b30a55c9 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -241,6 +241,8 @@ pub struct Build {
     clippy_info: channel::GitInfo,
     miri_info: channel::GitInfo,
     rustfmt_info: channel::GitInfo,
+    in_tree_llvm_info: channel::GitInfo,
+    emscripten_llvm_info: channel::GitInfo,
     local_rebuild: bool,
     fail_fast: bool,
     doc_tests: DocTests,
@@ -363,6 +365,8 @@ impl Build {
         let clippy_info = channel::GitInfo::new(&config, &src.join("src/tools/clippy"));
         let miri_info = channel::GitInfo::new(&config, &src.join("src/tools/miri"));
         let rustfmt_info = channel::GitInfo::new(&config, &src.join("src/tools/rustfmt"));
+        let in_tree_llvm_info = channel::GitInfo::new(&config, &src.join("src/llvm-project"));
+        let emscripten_llvm_info = channel::GitInfo::new(&config, &src.join("src/llvm-emscripten"));
 
         let mut build = Build {
             initial_rustc: config.initial_rustc.clone(),
@@ -386,6 +390,8 @@ impl Build {
             clippy_info,
             miri_info,
             rustfmt_info,
+            in_tree_llvm_info,
+            emscripten_llvm_info,
             cc: HashMap::new(),
             cxx: HashMap::new(),
             ar: HashMap::new(),
diff --git a/src/bootstrap/native.rs b/src/bootstrap/native.rs
index d78670cfe51..3babbc9e102 100644
--- a/src/bootstrap/native.rs
+++ b/src/bootstrap/native.rs
@@ -18,6 +18,7 @@ use build_helper::output;
 use cmake;
 use cc;
 
+use crate::channel;
 use crate::util::{self, exe};
 use build_helper::up_to_date;
 use crate::builder::{Builder, RunConfig, ShouldRun, Step};
@@ -231,7 +232,26 @@ impl Step for Llvm {
         }
 
         if let Some(ref suffix) = builder.config.llvm_version_suffix {
-            cfg.define("LLVM_VERSION_SUFFIX", suffix);
+            // Allow version-suffix="" to not define a version suffix at all.
+            if !suffix.is_empty() {
+                cfg.define("LLVM_VERSION_SUFFIX", suffix);
+            }
+        } else {
+            let mut default_suffix = format!(
+                "-rust-{}-{}",
+                channel::CFG_RELEASE_NUM,
+                builder.config.channel,
+            );
+            let llvm_info = if self.emscripten {
+                &builder.emscripten_llvm_info
+            } else {
+                &builder.in_tree_llvm_info
+            };
+            if let Some(sha) = llvm_info.sha_short() {
+                default_suffix.push_str("-");
+                default_suffix.push_str(sha);
+            }
+            cfg.define("LLVM_VERSION_SUFFIX", default_suffix);
         }
 
         if let Some(ref linker) = builder.config.llvm_use_linker {