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-rw-r--r--build_system/mod.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/build_system/mod.rs b/build_system/mod.rs
index f0cde968ae7..265416c48fc 100644
--- a/build_system/mod.rs
+++ b/build_system/mod.rs
@@ -134,6 +134,9 @@ pub fn main() {
         process::exit(0);
     }
 
+    env::set_var("RUSTC", "rustc_should_be_set_explicitly");
+    env::set_var("RUSTDOC", "rustdoc_should_be_set_explicitly");
+
     let cg_clif_dylib =
         build_backend::build_backend(&dirs, channel, &host_compiler, use_unstable_features);
     match command {