From 06582593257ccb0825d14b0740625546eb6bdc3d Mon Sep 17 00:00:00 2001
From: Dylan MacKenzie <ecstaticmorse@gmail.com>
Date: Thu, 23 Apr 2020 11:24:28 -0700
Subject: [PATCH] Set RUSTDOCFLAGS in `cargo` invocation

---
 src/bootstrap/builder.rs | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index 8d6c2db792645..466e2d6e79919 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -791,6 +791,11 @@ impl<'a> Builder<'a> {
             rustflags.arg("--cfg=bootstrap");
         }
 
+        // FIXME: It might be better to use the same value for both `RUSTFLAGS` and `RUSTDOCFLAGS`,
+        // but this breaks CI. At the very least, stage0 `rustdoc` needs `--cfg bootstrap`. See
+        // #71458.
+        let rustdocflags = rustflags.clone();
+
         if let Ok(s) = env::var("CARGOFLAGS") {
             cargo.args(s.split_whitespace());
         }
@@ -1269,7 +1274,7 @@ impl<'a> Builder<'a> {
             }
         }
 
-        Cargo { command: cargo, rustflags }
+        Cargo { command: cargo, rustflags, rustdocflags }
     }
 
     /// Ensure that a given step is built, returning its output. This will
@@ -1327,7 +1332,7 @@ impl<'a> Builder<'a> {
 #[cfg(test)]
 mod tests;
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 struct Rustflags(String);
 
 impl Rustflags {
@@ -1367,6 +1372,7 @@ impl Rustflags {
 pub struct Cargo {
     command: Command,
     rustflags: Rustflags,
+    rustdocflags: Rustflags,
 }
 
 impl Cargo {
@@ -1400,6 +1406,7 @@ impl Cargo {
 impl From<Cargo> for Command {
     fn from(mut cargo: Cargo) -> Command {
         cargo.command.env("RUSTFLAGS", &cargo.rustflags.0);
+        cargo.command.env("RUSTDOCFLAGS", &cargo.rustdocflags.0);
         cargo.command
     }
 }