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-rw-r--r--src/librustdoc/test.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/librustdoc/test.rs b/src/librustdoc/test.rs
index 31c0b85a481..88397aacac1 100644
--- a/src/librustdoc/test.rs
+++ b/src/librustdoc/test.rs
@@ -263,6 +263,7 @@ fn run_test(
     for extern_str in &options.extern_strs {
         compiler.arg("--extern").arg(&extern_str);
     }
+    compiler.arg("-Ccodegen-units=1");
     for codegen_options_str in &options.codegen_options_strs {
         compiler.arg("-C").arg(&codegen_options_str);
     }