diff --git a/lldb/source/Commands/CommandObjectTarget.cpp b/lldb/source/Commands/CommandObjectTarget.cpp
--- a/lldb/source/Commands/CommandObjectTarget.cpp
+++ b/lldb/source/Commands/CommandObjectTarget.cpp
@@ -2161,7 +2161,7 @@
     }
 
     const char *pcm_path = command.GetArgumentAtIndex(0);
-    FileSpec pcm_file{pcm_path};
+    const FileSpec pcm_file{pcm_path};
 
     if (pcm_file.GetFileNameExtension() != ".pcm") {
       result.AppendError("file must have a .pcm extension");
diff --git a/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.h b/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.h
--- a/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.h
+++ b/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.h
@@ -137,7 +137,8 @@
   // with the binary inside it ('.../foo.dSYM/Contents/Resources/DWARF/foo').
   // A dSYM bundle may have multiple DWARF binaries in them, so a vector
   // of matches is returned.
-  static std::vector<FileSpec> GetDWARFBinaryInDSYMBundle(FileSpec dsym_bundle);
+  static std::vector<FileSpec>
+  GetDWARFBinaryInDSYMBundle(const FileSpec &dsym_bundle);
 
   Status GetSharedModuleKext(const ModuleSpec &module_spec, Process *process,
                              lldb::ModuleSP &module_sp,
diff --git a/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.cpp b/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.cpp
--- a/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.cpp
+++ b/lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.cpp
@@ -421,7 +421,7 @@
   static constexpr llvm::StringLiteral g_kdk_suffix = ".kdk";
 
   PlatformDarwinKernel *thisp = (PlatformDarwinKernel *)baton;
-  FileSpec file_spec(path);
+  const FileSpec file_spec(path);
   if (ft == llvm::sys::fs::file_type::directory_file &&
       (file_spec.GetFileNameExtension() == g_sdk_suffix ||
        file_spec.GetFileNameExtension() == g_kdk_suffix)) {
@@ -482,7 +482,7 @@
   static constexpr llvm::StringLiteral g_kext_suffix = ".kext";
   static constexpr llvm::StringLiteral g_dsym_suffix = ".dSYM";
 
-  FileSpec file_spec(path);
+  const FileSpec file_spec(path);
   llvm::StringRef file_spec_extension = file_spec.GetFileNameExtension();
 
   Log *log = GetLog(LLDBLog::Platform);
@@ -691,7 +691,7 @@
 // it should iterate over every binary in the DWARF subdir
 // and return them all.
 std::vector<FileSpec>
-PlatformDarwinKernel::GetDWARFBinaryInDSYMBundle(FileSpec dsym_bundle) {
+PlatformDarwinKernel::GetDWARFBinaryInDSYMBundle(const FileSpec &dsym_bundle) {
   std::vector<FileSpec> results;
   static constexpr llvm::StringLiteral g_dsym_suffix = ".dSYM";
   if (dsym_bundle.GetFileNameExtension() != g_dsym_suffix) {
diff --git a/lldb/source/Plugins/ScriptInterpreter/Lua/Lua.cpp b/lldb/source/Plugins/ScriptInterpreter/Lua/Lua.cpp
--- a/lldb/source/Plugins/ScriptInterpreter/Lua/Lua.cpp
+++ b/lldb/source/Plugins/ScriptInterpreter/Lua/Lua.cpp
@@ -131,14 +131,13 @@
 }
 
 llvm::Error Lua::LoadModule(llvm::StringRef filename) {
-  FileSpec file(filename);
+  const FileSpec file(filename);
   if (!FileSystem::Instance().Exists(file)) {
     return llvm::make_error<llvm::StringError>("invalid path",
                                                llvm::inconvertibleErrorCode());
   }
 
-  llvm::StringRef module_extension = file.GetFileNameExtension();
-  if (module_extension != ".lua") {
+  if (file.GetFileNameExtension() != ".lua") {
     return llvm::make_error<llvm::StringError>("invalid extension",
                                                llvm::inconvertibleErrorCode());
   }