[libcxx-commits] [libcxx] [llvm] [libc++] Optionally support filecheck and split-file (PR #165769)

[Louis Dionne via libcxx-commits]

================
@@ -7,7 +7,7 @@
 # ===----------------------------------------------------------------------===##
 
 from libcxx.test.dsl import compilerMacros, sourceBuilds, hasCompileFlag, programSucceeds, runScriptExitCode
-from libcxx.test.dsl import Feature, AddCompileFlag, AddLinkFlag
+from libcxx.test.dsl import Feature, AddCompileFlag, AddLinkFlag, AddSubstitution
----------------
ldionne wrote:

```suggestion
from libcxx.test.dsl import Feature, AddCompileFlag, AddLinkFlag
```

https://github.com/llvm/llvm-project/pull/165769