Index: include/lldb/Core/ModuleList.h
===================================================================
--- include/lldb/Core/ModuleList.h
+++ include/lldb/Core/ModuleList.h
@@ -81,6 +81,7 @@
 
   FileSpec GetClangModulesCachePath() const;
   bool SetClangModulesCachePath(llvm::StringRef path);
+  bool GetEnableExternalLookup() const;
 }; 
 
 //----------------------------------------------------------------------
Index: lit/lit-lldb-init
===================================================================
--- /dev/null
+++ lit/lit-lldb-init
@@ -0,0 +1,2 @@
+# LLDB init file for the LIT tests.
+settings set symbols.enable-external-lookup false
Index: lit/lit.cfg
===================================================================
--- lit/lit.cfg
+++ lit/lit.cfg
@@ -55,7 +55,8 @@
 config.substitutions.append(('%python', config.python_executable))
 
 debugserver = lit.util.which('debugserver', lldb_tools_dir)
-lldb = lit.util.which('lldb', lldb_tools_dir)
+lldb = "%s -S %s/lit-lldb-init" % (lit.util.which('lldb', lldb_tools_dir),
+                               config.test_source_root)
 
 if not os.path.exists(config.cc):
     config.cc = lit.util.which(config.cc, config.environment['PATH'])
Index: packages/Python/lldbsuite/test/lldbtest.py
===================================================================
--- packages/Python/lldbsuite/test/lldbtest.py
+++ packages/Python/lldbsuite/test/lldbtest.py
@@ -1917,13 +1917,18 @@
         # decorators.
         Base.setUp(self)
 
-        # Set the clang modules cache path.
         if self.child:
+            # Set the clang modules cache path.
             assert(self.getDebugInfo() == 'default')
             mod_cache = os.path.join(self.getBuildDir(), "module-cache")
             self.runCmd('settings set symbols.clang-modules-cache-path "%s"'
                         % mod_cache)
 
+            # Disable Spotlight lookup. The testsuite creates
+            # different binaries with the same UUID, because they only
+            # differ in the debug info, which is not being hashed.
+            self.runCmd('settings set symbols.enable-external-lookup false')
+
 
         if "LLDB_MAX_LAUNCH_COUNT" in os.environ:
             self.maxLaunchCount = int(os.environ["LLDB_MAX_LAUNCH_COUNT"])
Index: source/Core/ModuleList.cpp
===================================================================
--- source/Core/ModuleList.cpp
+++ source/Core/ModuleList.cpp
@@ -67,12 +67,17 @@
 namespace {
 
 PropertyDefinition g_properties[] = {
+    {"enable-external-lookup", OptionValue::eTypeBoolean, true, true, nullptr,
+     nullptr,
+     "Control the use of external tools or libraries to locate symbol files. "
+     "On macOS, Spotlight is used to locate a matching .dSYM bundle based on "
+     "the UUID of the executable."},
     {"clang-modules-cache-path", OptionValue::eTypeFileSpec, true, 0, nullptr,
      nullptr,
      "The path to the clang modules cache directory (-fmodules-cache-path)."},
     {nullptr, OptionValue::eTypeInvalid, false, 0, nullptr, nullptr, nullptr}};
 
-enum { ePropertyClangModulesCachePath };
+enum { ePropertyEnableExternalLookup, ePropertyClangModulesCachePath };
 
 } // namespace
 
@@ -85,6 +90,12 @@
   SetClangModulesCachePath(path);
 }
 
+bool ModuleListProperties::GetEnableExternalLookup() const {
+  const uint32_t idx = ePropertyEnableExternalLookup;
+  return m_collection_sp->GetPropertyAtIndexAsBoolean(
+      nullptr, idx, g_properties[idx].default_uint_value != 0);
+}
+
 FileSpec ModuleListProperties::GetClangModulesCachePath() const {
   return m_collection_sp
       ->GetPropertyAtIndexAsOptionValueFileSpec(nullptr, false,
Index: source/Host/macosx/Symbols.cpp
===================================================================
--- source/Host/macosx/Symbols.cpp
+++ source/Host/macosx/Symbols.cpp
@@ -23,6 +23,7 @@
 #include "Host/macosx/cfcpp/CFCData.h"
 #include "Host/macosx/cfcpp/CFCReleaser.h"
 #include "Host/macosx/cfcpp/CFCString.h"
+#include "lldb/Core/ModuleList.h"
 #include "lldb/Core/ModuleSpec.h"
 #include "lldb/Host/Host.h"
 #include "lldb/Symbol/ObjectFile.h"
@@ -54,6 +55,13 @@
 
 int LocateMacOSXFilesUsingDebugSymbols(const ModuleSpec &module_spec,
                                        ModuleSpec &return_module_spec) {
+  Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
+  if (!ModuleList::GetGlobalModuleListProperties().GetEnableExternalLookup()) {
+    if (log)
+      log->Printf("Spotlight lookup for .dSYM bundles is disabled.");
+    return 0;
+  }
+  
   return_module_spec = module_spec;
   return_module_spec.GetFileSpec().Clear();
   return_module_spec.GetSymbolFileSpec().Clear();
@@ -79,7 +87,6 @@
       if (module_uuid_ref.get()) {
         CFCReleaser<CFURLRef> exec_url;
         const FileSpec *exec_fspec = module_spec.GetFileSpecPtr();
-        Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
         if (exec_fspec) {
           char exec_cf_path[PATH_MAX];
           if (exec_fspec->GetPath(exec_cf_path, sizeof(exec_cf_path)))