From 3035816fc13c2ae30d46849bfcceec085a2f47e2 Mon Sep 17 00:00:00 2001
From: Augie Fackler <augie@google.com>
Date: Mon, 17 May 2021 13:08:42 -0400
Subject: [PATCH] runtest: correctly guard against LLVM version 13

---
 src/tools/compiletest/src/runtest.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 517ae9c4dff9..80d905c730f4 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -2293,7 +2293,11 @@ impl<'test> TestCx<'test> {
         // For now, though…
         if let Some(rev) = self.revision {
             let prefixes = format!("CHECK,{}", rev);
-            filecheck.args(&["--allow-unused-prefixes", "--check-prefixes", &prefixes]);
+            if self.config.llvm_version.unwrap_or(0) >= 130000 {
+                filecheck.args(&["--allow-unused-prefixes", "--check-prefixes", &prefixes]);
+            } else {
+                filecheck.args(&["--check-prefixes", &prefixes]);
+            }
         }
         self.compose_and_run(filecheck, "", None, None)
     }