Index: clang-tools-extra/clangd/index/dex/dexp/Dexp.cpp
===================================================================
--- clang-tools-extra/clangd/index/dex/dexp/Dexp.cpp
+++ clang-tools-extra/clangd/index/dex/dexp/Dexp.cpp
@@ -413,6 +413,12 @@
   using namespace clang::clangd;
 
   llvm::cl::ParseCommandLineOptions(argc, argv, Overview);
+
+  // Protect IndexLocation, ExecCommand and ProjectRoot from being reset.
+  IndexLocation.setValue(IndexLocation, true /* initial */);
+  ExecCommand.setValue(ExecCommand, true /* initial */);
+  ProjectRoot.setValue(ProjectRoot, true /* initial */);
+
   llvm::cl::ResetCommandLineParser(); // We reuse it for REPL commands.
   llvm::sys::PrintStackTraceOnErrorSignal(argv[0]);