Index: llvm/lib/Support/Triple.cpp
===================================================================
--- llvm/lib/Support/Triple.cpp
+++ llvm/lib/Support/Triple.cpp
@@ -1106,7 +1106,8 @@
       Major = 10;
     } else {
       Micro = 0;
-      Minor = 0;
+      // macOS 11+ minor version trails darwin20+ version by 1, unless 0.
+      Minor = Minor == 0 ? 0 : Minor - 1;
       // darwin20+ corresponds to macOS 11+.
       Major = 11 + Major - 20;
     }