Fix warnings about catching polymorphic types by value (#1843).

3 files changed, 3 insertions, 3 deletions

diff --git a/src/lib/reel_writer.cc b/src/lib/reel_writer.cc
index 071cab12a..84923c202 100644
--- a/src/lib/reel_writer.cc
+++ b/src/lib/reel_writer.cc
@@ -211,7 +211,7 @@ ReelWriter::check_existing_picture_asset ()
 
 	try {
 		info_file = _film->info_file_handle (_period, true);
-	} catch (OpenFileError) {
+	} catch (OpenFileError &) {
 		LOG_GENERAL_NC ("Could not open film info file");
 		fclose (asset_file);
 		return 0;
diff --git a/src/tools/dcpomatic_kdm.cc b/src/tools/dcpomatic_kdm.cc
index 6c1fbd800..3b97fa2da 100644
--- a/src/tools/dcpomatic_kdm.cc
+++ b/src/tools/dcpomatic_kdm.cc
@@ -437,7 +437,7 @@ private:
 					std_to_wx(e.what())
 					);
 				return;
-			} catch (dcp::KDMDecryptionError) {
+			} catch (dcp::KDMDecryptionError &) {
 				error_dialog (
 					this,
 					_("Could not decrypt the DKDM.  Perhaps it was not created with the correct certificate.")
diff --git a/src/wx/kdm_cpl_panel.cc b/src/wx/kdm_cpl_panel.cc
index 967fb2845..8b4d93129 100644
--- a/src/wx/kdm_cpl_panel.cc
+++ b/src/wx/kdm_cpl_panel.cc
@@ -143,7 +143,7 @@ KDMCPLPanel::cpl_browse_clicked ()
 				0
 				)
 			);
-	} catch (cxml::Error) {
+	} catch (cxml::Error &) {
 		error_dialog (this, _("This is not a valid CPL file"));
 		return;
 	}