================
@@ -188,6 +189,7 @@ def parseScript(test, preamble):
             "%dbg(MODULE std) %{cxx} %{flags} "
             f"{compileFlags} "
             "-Wno-reserved-module-identifier 
-Wno-reserved-user-defined-literal "
+            "-fexperimental-modules-reduced-bmi "
----------------
ldionne wrote:

If this is the "new way" of building with C++20 modules, then I think it would 
make sense to mark the offending libc++ tests as `UNSUPPORTED: clang-18, 
clang-19`. But that does seem like a big user-facing change too, doesn't it?

https://github.com/llvm/llvm-project/pull/114382
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