Confirm the performance report saving to the user

Also fix a compilation issue with compilers not recognizing uint

src/io/file_manager.cpp

@@ -849,6 +849,14 @@ std::string FileManager::getGPDir() const
     return m_gp_dir;
 }   // getGPDir
 
+//-----------------------------------------------------------------------------
+/** Returns the directory in which the stdout file should be stored.
+ */
+std::string FileManager::getStdoutDir() const
+{
+    return m_stdout_dir;
+}   // getStdoutDir
+
 //-----------------------------------------------------------------------------
 /** Returns the full path of a texture file name by searching in all
  *  directories currently in the texture search path. The difference to

src/io/file_manager.hpp

@@ -155,6 +155,7 @@ class FileManager : public NoCopy
     std::string       getReplayDir() const;
     std::string       getCachedTexturesDir() const;
     std::string       getGPDir() const;
+    std::string       getStdoutDir() const;
     bool              checkAndCreateDirectory(const std::string &path);
     bool              checkAndCreateDirectoryP(const std::string &path);
     const std::string &getAddonsDir() const;

src/states_screens/race_result_gui.cpp

@@ -570,6 +570,13 @@ void RaceResultGUI::eventCallback(GUIEngine::Widget* widget,
             if (action == "middle") // Save benchmark results
             {
                 profiler.writeToFile();
+
+                // Disable the saving button to make it clearer that it has been done
+                getWidget<GUIEngine::IconButtonWidget>("middle")->setActive(false);
+                // Also push a confirmation to the message queue
+                core::stringw msg = _("Performance report saved in \"%s\".",
+                    StringUtils::utf8ToWide(file_manager->getStdoutDir()));
+                MessageQueue::add(MessageQueue::MT_GENERIC, msg);
             }
             else                    // Leave to menu or video settings
             {

src/utils/profiler.cpp

@@ -622,7 +622,7 @@ void Profiler::computeStableFPS()
         m_time_waited_in_slow_frames[i-1] = 0;
         m_slow_frames[i-1] = m_frame_times.size(); // Will be updated if lower
 
-        for (uint j=0; j<m_frame_times.size(); j++)
+        for (int j=0; j<(int)m_frame_times.size(); j++)
         {
             if (m_frame_times[j] > max_microseconds)
             {