Index: include/lldb/API/SystemInitializerFull.h
===================================================================
--- include/lldb/API/SystemInitializerFull.h
+++ include/lldb/API/SystemInitializerFull.h
@@ -29,6 +29,8 @@
   void Initialize() override;
   void Terminate() override;
 
+  /// Retrieve the default clang module cache path.
+  static void InitializeClang();
 private:
   void InitializeSWIG();
 };
Index: include/lldb/Core/ModuleList.h
===================================================================
--- include/lldb/Core/ModuleList.h
+++ include/lldb/Core/ModuleList.h
@@ -79,6 +79,10 @@
 public:
   ModuleListProperties();
 
+  /// Set the default clang modules cache path.
+  /// This avoids Core depending on Clang.
+  static void Initialize(llvm::StringRef clang_modules_cache_path);
+
   FileSpec GetClangModulesCachePath() const;
   bool SetClangModulesCachePath(llvm::StringRef path);
   bool GetEnableExternalLookup() const;
Index: include/lldb/Host/HostInfoBase.h
===================================================================
--- include/lldb/Host/HostInfoBase.h
+++ include/lldb/Host/HostInfoBase.h
@@ -89,7 +89,7 @@
   /// ArchSpec object.
   //---------------------------------------------------------------------------
   static ArchSpec GetAugmentedArchSpec(llvm::StringRef triple);
-
+  
 protected:
   static bool ComputeSharedLibraryDirectory(FileSpec &file_spec);
   static bool ComputeSupportExeDirectory(FileSpec &file_spec);
Index: source/API/SystemInitializerFull.cpp
===================================================================
--- source/API/SystemInitializerFull.cpp
+++ source/API/SystemInitializerFull.cpp
@@ -119,6 +119,7 @@
 #endif
 
 #include "llvm/Support/TargetSelect.h"
+#include "clang/Driver/Driver.h"
 
 #include <string>
 
@@ -385,6 +386,13 @@
   // AFTER PluginManager::Initialize is called.
 
   Debugger::SettingsInitialize();
+  InitializeClang();
+}
+
+void SystemInitializerFull::InitializeClang() {
+  llvm::SmallString<128> path;
+  clang::driver::Driver::getDefaultModuleCachePath(path);
+  ModuleListProperties::Initialize(path);
 }
 
 void SystemInitializerFull::InitializeSWIG() {
Index: source/Core/ModuleList.cpp
===================================================================
--- source/Core/ModuleList.cpp
+++ source/Core/ModuleList.cpp
@@ -13,6 +13,7 @@
 #include "lldb/Core/ModuleSpec.h"
 #include "lldb/Host/FileSystem.h"
 #include "lldb/Host/Symbols.h"
+#include "lldb/Host/HostInfoBase.h"
 #include "lldb/Interpreter/OptionValueProperties.h"
 #include "lldb/Interpreter/OptionValueFileSpec.h"
 #include "lldb/Interpreter/Property.h"
@@ -34,7 +35,6 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Threading.h"
 #include "llvm/Support/raw_ostream.h" // for fs
-#include "clang/Driver/Driver.h"
 
 #include <chrono> // for operator!=, time_point
 #include <memory> // for shared_ptr
@@ -79,15 +79,20 @@
 
 enum { ePropertyEnableExternalLookup, ePropertyClangModulesCachePath };
 
+std::string g_default_clang_modules_cache_path;
 } // namespace
 
+void ModuleListProperties::Initialize(
+    llvm::StringRef clang_modules_cache_path) {
+  g_default_clang_modules_cache_path = clang_modules_cache_path.str();
+}
+
 ModuleListProperties::ModuleListProperties() {
   m_collection_sp.reset(new OptionValueProperties(ConstString("symbols")));
   m_collection_sp->Initialize(g_properties);
 
-  llvm::SmallString<128> path;
-  clang::driver::Driver::getDefaultModuleCachePath(path);
-  SetClangModulesCachePath(path);
+  assert(!g_default_clang_modules_cache_path.empty());
+  SetClangModulesCachePath(g_default_clang_modules_cache_path);
 }
 
 bool ModuleListProperties::GetEnableExternalLookup() const {
Index: tools/lldb-test/CMakeLists.txt
===================================================================
--- tools/lldb-test/CMakeLists.txt
+++ tools/lldb-test/CMakeLists.txt
@@ -19,6 +19,7 @@
     lldbUtility
     ${LLDB_ALL_PLUGINS}
     ${host_lib}
+    clangDriver
 
   LINK_COMPONENTS
     Support
Index: tools/lldb-test/lldb-test.cpp
===================================================================
--- tools/lldb-test/lldb-test.cpp
+++ tools/lldb-test/lldb-test.cpp
@@ -34,6 +34,9 @@
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/WithColor.h"
+
+#include "clang/Driver/Driver.h"
+
 #include <thread>
 
 using namespace lldb;
@@ -467,6 +470,11 @@
 
   cl::ParseCommandLineOptions(argc, argv, "LLDB Testing Utility\n");
 
+  // Retrieve the default modulecache path from clang.
+  llvm::SmallString<128> path;
+  clang::driver::Driver::getDefaultModuleCachePath(path);
+  ModuleListProperties::Initialize(path);
+
   SystemLifetimeManager DebuggerLifetime;
   DebuggerLifetime.Initialize(llvm::make_unique<SystemInitializerTest>(),
                               nullptr);
Index: unittests/Host/SymbolsTest.cpp
===================================================================
--- unittests/Host/SymbolsTest.cpp
+++ unittests/Host/SymbolsTest.cpp
@@ -9,13 +9,16 @@
 
 #include "gtest/gtest.h"
 
+#include "lldb/API/SystemInitializerFull.h"
 #include "lldb/Host/Symbols.h"
+#include "lldb/Core/ModuleList.h"
 #include "lldb/Core/ModuleSpec.h"
 
 using namespace lldb_private;
 
 TEST(SymbolsTest,
      LocateExecutableSymbolFileForUnknownExecutableAndUnknownSymbolFile) {
+  ModuleListProperties::Initialize("dummy");
   ModuleSpec module_spec;
   FileSpec symbol_file_spec = Symbols::LocateExecutableSymbolFile(module_spec);
   EXPECT_TRUE(symbol_file_spec.GetFilename().IsEmpty());
@@ -23,6 +26,7 @@
 
 TEST(SymbolsTest,
      LocateExecutableSymbolFileForUnknownExecutableAndMissingSymbolFile) {
+  ModuleListProperties::Initialize("dummy");
   ModuleSpec module_spec;
   // using a GUID here because the symbol file shouldn't actually exist on disk
   module_spec.GetSymbolFileSpec().SetFile(
Index: unittests/Target/ModuleCacheTest.cpp
===================================================================
--- unittests/Target/ModuleCacheTest.cpp
+++ unittests/Target/ModuleCacheTest.cpp
@@ -5,7 +5,9 @@
 #include "llvm/Support/Path.h"
 
 #include "Plugins/ObjectFile/ELF/ObjectFileELF.h"
+#include "lldb/API/SystemInitializerFull.h"
 #include "lldb/Core/Module.h"
+#include "lldb/Core/ModuleList.h"
 #include "lldb/Core/ModuleSpec.h"
 #include "lldb/Host/HostInfo.h"
 #include "lldb/Symbol/SymbolContext.h"
@@ -67,6 +69,7 @@
 void ModuleCacheTest::SetUpTestCase() {
   HostInfo::Initialize();
   ObjectFileELF::Initialize();
+  ModuleListProperties::Initialize("dummy");
 
   FileSpec tmpdir_spec;
   HostInfo::GetLLDBPath(lldb::ePathTypeLLDBTempSystemDir, s_cache_dir);