fixes #452. I don't know why the compile commands insterts these?

src/compile_commands.cpp

@@ -151,7 +151,7 @@ std::vector<std::string> CompileCommands::get_arguments(const boost::filesystem:
                     cmd_arguments[c] == "-MF") {                         // Exclude dependency file generation
               ignore_next = true;
             }
-            else if(cmd_arguments[c] == "-c") {
+            else if(cmd_arguments[c] == "-c" || cmd_arguments[c] == "--") {
             }
             else
               arguments.emplace_back(cmd_arguments[c]);