Workaround for rust-lang#46995.

src/bootstrap/tool.rs

@@ -313,6 +313,10 @@ impl Step for Rustdoc {
         cargo.env("RUSTC_DEBUGINFO", builder.config.rust_debuginfo.to_string())
              .env("RUSTC_DEBUGINFO_LINES", builder.config.rust_debuginfo_lines.to_string());
 
+        if build.config.llvm_link_shared {
+            cargo.env("LLVM_LINK_SHARED", "1");
+        }
+
         build.run(&mut cargo);
         // Cargo adds a number of paths to the dylib search path on windows, which results in
         // the wrong rustdoc being executed. To avoid the conflicting rustdocs, we name the "tool"

src/tools/rustdoc/Cargo.toml

@@ -12,3 +12,4 @@ path = "main.rs"
 
 [dependencies]
 rustdoc = { path = "../../librustdoc" }
+rustc_llvm = { path = "../../librustc_llvm" }

src/tools/rustdoc/main.rs

@@ -9,5 +9,6 @@
 // except according to those terms.
 
 extern crate rustdoc;
+extern crate rustc_llvm;
 
 fn main() { rustdoc::main() }