Index: clang-20.1.0.src.src/lib/Driver/Driver.cpp
===================================================================
--- clang-20.1.0.src.src.orig/lib/Driver/Driver.cpp
+++ clang-20.1.0.src.src/lib/Driver/Driver.cpp
@@ -176,7 +176,7 @@
 
   // Dir is bin/ or lib/, depending on where BinaryPath is.
   StringRef Dir = llvm::sys::path::parent_path(BinaryPath);
-  SmallString<128> P(Dir);
+  SmallString<128> P((Dir != "") ? Dir : "/usr/bin/");
 
   StringRef ConfiguredResourceDir(CLANG_RESOURCE_DIR);
   if (!ConfiguredResourceDir.empty()) {