Fix some warnings given by clang, see issue 1718

rtengine/dfmanager.cc

@@ -251,9 +251,9 @@ dfInfo *DFManager::addFileInfo(const Glib::ustring &filename ,bool pool )
 {
 	Glib::RefPtr<Gio::File> file = Gio::File::create_for_path(filename);
     if (!file )
-        return false;
+        return 0;
     if( !file->query_exists())
-    	return false;
+    	return 0;
     Glib::RefPtr<Gio::FileInfo> info = safe_query_file_info(file);
     if (info && info->get_file_type() != Gio::FILE_TYPE_DIRECTORY && (!info->is_hidden() || !options.fbShowHidden)) {
 	size_t lastdot = info->get_name().find_last_of ('.');

rtengine/ffmanager.cc

@@ -209,9 +209,9 @@ ffInfo *FFManager::addFileInfo(const Glib::ustring &filename, bool pool )
 {
 	Glib::RefPtr<Gio::File> file = Gio::File::create_for_path(filename);
     if (!file )
-        return false;
+        return 0;
     if( !file->query_exists())
-    	return false;
+    	return 0;
     Glib::RefPtr<Gio::FileInfo> info = safe_query_file_info(file);
     if (info && info->get_file_type() != Gio::FILE_TYPE_DIRECTORY && (!info->is_hidden() || !options.fbShowHidden)) {
 	size_t lastdot = info->get_name().find_last_of ('.');

rtgui/batchqueue.cc

@@ -558,6 +558,7 @@ Glib::ustring BatchQueue::autoCompleteFileName (const Glib::ustring& fileName, c
     // separate filename and the path to the destination directory
     Glib::ustring dstdir = Glib::path_get_dirname (fileName);
     Glib::ustring dstfname = Glib::path_get_basename (fileName);
+    Glib::ustring fname;
 
     // create directory, if does not exist
     if (safe_g_mkdir_with_parents (dstdir, 0755) ) 
@@ -568,7 +569,6 @@ Glib::ustring BatchQueue::autoCompleteFileName (const Glib::ustring& fileName, c
 	bool inOverwriteMode=options.overwriteOutputFile;
 
     for (int tries=0; tries<100; tries++) {
-        Glib::ustring fname;
         if (tries==0)
             fname = Glib::ustring::compose ("%1.%2", Glib::build_filename (dstdir,  dstfname), format);
         else
@@ -587,6 +587,7 @@ Glib::ustring BatchQueue::autoCompleteFileName (const Glib::ustring& fileName, c
             return fname;
         }
     }
+    return "";
 }
 
 int setProgressUI (void* p) {

rtgui/darkframe.h

@@ -27,7 +27,7 @@
 
 class DFProvider {
   public:
-    virtual rtengine::RawImage* getDF() {}
+    virtual rtengine::RawImage* getDF() = 0;
     // add other info here
 };
 

rtgui/filecatalog.cc

@@ -1533,6 +1533,7 @@ bool FileCatalog::Query_key_pressed (GdkEventKey *event){
 	    	// Clear Query if the Escape character is pressed within it
 	    	FileCatalog::buttonQueryClearPressed ();
 	        return true;
+	    default: return false;
 	  }
 }
 

rtgui/flatfield.h

@@ -28,7 +28,7 @@
 
 class FFProvider {
   public:
-    virtual rtengine::RawImage* getFF() {}
+    virtual rtengine::RawImage* getFF() = 0;
     // add other info here
 };