From 1da44451098e9947fa398e7d2858853a8964c200 Mon Sep 17 00:00:00 2001
From: Joshua Nelson <jyn514@gmail.com>
Date: Sat, 1 May 2021 00:06:17 -0400
Subject: [PATCH] Apply `--cfg parallel_compiler` when documenting

This also reverts commit 9823c2cc700fea541bf2670fcee93af662b63022
working around the bug.
---
 compiler/rustc_middle/src/ty/query/mod.rs |  1 +
 compiler/rustc_query_impl/src/plumbing.rs | 10 ++++------
 src/bootstrap/compile.rs                  |  1 +
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/compiler/rustc_middle/src/ty/query/mod.rs b/compiler/rustc_middle/src/ty/query/mod.rs
index c170858ba85..f50c506f169 100644
--- a/compiler/rustc_middle/src/ty/query/mod.rs
+++ b/compiler/rustc_middle/src/ty/query/mod.rs
@@ -233,6 +233,7 @@ fn clone(&self) -> Self { *self }
         }
 
         pub trait QueryEngine<'tcx>: rustc_data_structures::sync::Sync {
+            #[cfg(parallel_compiler)]
             unsafe fn deadlock(&'tcx self, tcx: TyCtxt<'tcx>, registry: &rustc_rayon_core::Registry);
 
             fn encode_query_results(
diff --git a/compiler/rustc_query_impl/src/plumbing.rs b/compiler/rustc_query_impl/src/plumbing.rs
index ee914fa1ba9..c789aa2fa59 100644
--- a/compiler/rustc_query_impl/src/plumbing.rs
+++ b/compiler/rustc_query_impl/src/plumbing.rs
@@ -550,12 +550,10 @@ pub(crate) fn try_collect_active_jobs(
         }
 
         impl QueryEngine<'tcx> for Queries<'tcx> {
-            unsafe fn deadlock(&'tcx self, _tcx: TyCtxt<'tcx>, _registry: &rustc_rayon_core::Registry) {
-                #[cfg(parallel_compiler)]
-                {
-                    let tcx = QueryCtxt { tcx: _tcx, queries: self };
-                    rustc_query_system::query::deadlock(tcx, _registry)
-                }
+            #[cfg(parallel_compiler)]
+            unsafe fn deadlock(&'tcx self, tcx: TyCtxt<'tcx>, registry: &rustc_rayon_core::Registry) {
+                let tcx = QueryCtxt { tcx, queries: self };
+                rustc_query_system::query::deadlock(tcx, registry)
             }
 
             fn encode_query_results(
diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index 66a88e85fea..2676b3bf8e0 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -648,6 +648,7 @@ pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetS
     }
     if builder.config.rustc_parallel {
         cargo.rustflag("--cfg=parallel_compiler");
+        cargo.rustdocflag("--cfg=parallel_compiler");
     }
     if builder.config.rust_verify_llvm_ir {
         cargo.env("RUSTC_VERIFY_LLVM_IR", "1");