================
@@ -172,6 +172,20 @@ def push_dynamic_library_lookup_path(config, new_path):
 # doesn't match config.compiler_rt_libdir then it means we might be testing the
 # compiler's own runtime libraries rather than the ones we just built.
 # Warn about about this and handle appropriately.
+if config.test_standalone_build_libs:
+    if config.compiler_id == "Clang":
+        # Ensure that we use the just-built libraries when linking by 
overriding
+        # the Clang resource directory. However, this also means that we can no
+        # longer find the builtin headers from that path, so we explicitly add
+        # the builtin headers as an include path.
----------------
delcypher wrote:

Sorry. It's been a while since I looked at this code. If you use a different 
resource directory why can't the compiler use the header files in that resource 
directory?

https://github.com/llvm/llvm-project/pull/83088
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